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gstreamer/gst/flv/gstflvdemux.c

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/* GStreamer
* Copyright (C) <2007> Julien Moutte <julien@moutte.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-flvdemux
*
* flvdemux demuxes an FLV file into the different contained streams.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v filesrc location=/path/to/flv ! flvdemux ! audioconvert ! autoaudiosink
* ]| This pipeline demuxes an FLV file and outputs the contained raw audio streams.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include "gstflvdemux.h"
#include "gstflvmux.h"
#include <string.h>
#include <gst/base/gstbytereader.h>
#include <gst/pbutils/descriptions.h>
#include <gst/pbutils/pbutils.h>
static GstStaticPadTemplate flv_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-flv")
);
static GstStaticPadTemplate audio_src_template =
GST_STATIC_PAD_TEMPLATE ("audio",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS
("audio/x-adpcm, layout = (string) swf, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/mpeg, mpegversion = (int) 1, layer = (int) 3, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 22050, 44100 }, parsed = (boolean) TRUE; "
"audio/mpeg, mpegversion = (int) 4, stream-format = (string) raw, framed = (boolean) TRUE; "
"audio/x-nellymoser, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 16000, 22050, 44100 }; "
"audio/x-raw-int, endianness = (int) LITTLE_ENDIAN, channels = (int) { 1, 2 }, width = (int) 8, depth = (int) 8, rate = (int) { 5512, 11025, 22050, 44100 }, signed = (boolean) FALSE; "
"audio/x-raw-int, endianness = (int) LITTLE_ENDIAN, channels = (int) { 1, 2 }, width = (int) 16, depth = (int) 16, rate = (int) { 5512, 11025, 22050, 44100 }, signed = (boolean) TRUE; "
"audio/x-alaw, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/x-mulaw, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/x-speex, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 };")
);
static GstStaticPadTemplate video_src_template =
GST_STATIC_PAD_TEMPLATE ("video",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("video/x-flash-video; "
"video/x-flash-screen; "
"video/x-vp6-flash; " "video/x-vp6-alpha; "
"video/x-h264, stream-format=avc;")
);
GST_DEBUG_CATEGORY_STATIC (flvdemux_debug);
#define GST_CAT_DEFAULT flvdemux_debug
GST_BOILERPLATE (GstFlvDemux, gst_flv_demux, GstElement, GST_TYPE_ELEMENT);
/* 9 bytes of header + 4 bytes of first previous tag size */
#define FLV_HEADER_SIZE 13
/* 1 byte of tag type + 3 bytes of tag data size */
#define FLV_TAG_TYPE_SIZE 4
/* two seconds - consider pts are resynced to another base if this different */
#define RESYNC_THRESHOLD 2000
static gboolean flv_demux_handle_seek_push (GstFlvDemux * demux,
GstEvent * event);
static gboolean gst_flv_demux_handle_seek_pull (GstFlvDemux * demux,
GstEvent * event, gboolean seeking);
static gboolean gst_flv_demux_query (GstPad * pad, GstQuery * query);
static gboolean gst_flv_demux_src_event (GstPad * pad, GstEvent * event);
static void
gst_flv_demux_parse_and_add_index_entry (GstFlvDemux * demux, GstClockTime ts,
guint64 pos, gboolean keyframe)
{
static GstIndexAssociation associations[2];
static GstIndexEntry *entry;
GST_LOG_OBJECT (demux,
"adding key=%d association %" GST_TIME_FORMAT "-> %" G_GUINT64_FORMAT,
keyframe, GST_TIME_ARGS (ts), pos);
/* if upstream is not seekable there is no point in building an index */
if (!demux->upstream_seekable)
return;
/* entry may already have been added before, avoid adding indefinitely */
entry = gst_index_get_assoc_entry (demux->index, demux->index_id,
GST_INDEX_LOOKUP_EXACT, GST_ASSOCIATION_FLAG_NONE, GST_FORMAT_BYTES, pos);
if (entry) {
#ifndef GST_DISABLE_GST_DEBUG
gint64 time;
gboolean key;
gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time);
key = ! !(GST_INDEX_ASSOC_FLAGS (entry) & GST_ASSOCIATION_FLAG_KEY_UNIT);
GST_LOG_OBJECT (demux, "position already mapped to time %" GST_TIME_FORMAT
", keyframe %d", GST_TIME_ARGS (time), key);
/* there is not really a way to delete the existing one */
if (time != ts || key != ! !keyframe)
GST_DEBUG_OBJECT (demux, "metadata mismatch");
#endif
return;
}
associations[0].format = GST_FORMAT_TIME;
associations[0].value = ts;
associations[1].format = GST_FORMAT_BYTES;
associations[1].value = pos;
gst_index_add_associationv (demux->index, demux->index_id,
(keyframe) ? GST_ASSOCIATION_FLAG_KEY_UNIT :
GST_ASSOCIATION_FLAG_DELTA_UNIT, 2,
(const GstIndexAssociation *) &associations);
if (pos > demux->index_max_pos)
demux->index_max_pos = pos;
if (ts > demux->index_max_time)
demux->index_max_time = ts;
}
static gchar *
FLV_GET_STRING (GstByteReader * reader)
{
guint16 string_size = 0;
gchar *string = NULL;
const guint8 *str = NULL;
g_return_val_if_fail (reader != NULL, NULL);
if (G_UNLIKELY (!gst_byte_reader_get_uint16_be (reader, &string_size)))
return NULL;
if (G_UNLIKELY (string_size > gst_byte_reader_get_remaining (reader)))
return NULL;
string = g_try_malloc0 (string_size + 1);
if (G_UNLIKELY (!string)) {
return NULL;
}
if (G_UNLIKELY (!gst_byte_reader_get_data (reader, string_size, &str))) {
g_free (string);
return NULL;
}
memcpy (string, str, string_size);
if (!g_utf8_validate (string, string_size, NULL)) {
g_free (string);
return NULL;
}
return string;
}
static const GstQueryType *
gst_flv_demux_query_types (GstPad * pad)
{
static const GstQueryType query_types[] = {
GST_QUERY_DURATION,
GST_QUERY_POSITION,
GST_QUERY_SEEKING,
0
};
return query_types;
}
static void
gst_flv_demux_check_seekability (GstFlvDemux * demux)
{
GstQuery *query;
gint64 start = -1, stop = -1;
demux->upstream_seekable = FALSE;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (!gst_pad_peer_query (demux->sinkpad, query)) {
GST_DEBUG_OBJECT (demux, "seeking query failed");
gst_query_unref (query);
return;
}
gst_query_parse_seeking (query, NULL, &demux->upstream_seekable,
&start, &stop);
gst_query_unref (query);
/* try harder to query upstream size if we didn't get it the first time */
if (demux->upstream_seekable && stop == -1) {
GstFormat fmt = GST_FORMAT_BYTES;
GST_DEBUG_OBJECT (demux, "doing duration query to fix up unset stop");
gst_pad_query_peer_duration (demux->sinkpad, &fmt, &stop);
}
/* if upstream doesn't know the size, it's likely that it's not seekable in
* practice even if it technically may be seekable */
if (demux->upstream_seekable && (start != 0 || stop <= start)) {
GST_DEBUG_OBJECT (demux, "seekable but unknown start/stop -> disable");
demux->upstream_seekable = FALSE;
}
GST_DEBUG_OBJECT (demux, "upstream seekable: %d", demux->upstream_seekable);
}
static void
parse_flv_demux_parse_date_string (GDate * date, const gchar * s)
{
g_date_set_parse (date, s);
if (g_date_valid (date))
return;
/* "Fri Oct 15 15:13:16 2004" needs to be parsed */
{
static const gchar *months[] = {
"Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec"
};
gchar **tokens = g_strsplit (s, " ", -1);
guint64 d;
gchar *endptr;
gint i;
if (g_strv_length (tokens) != 5)
goto out;
if (strlen (tokens[1]) != 3)
goto out;
for (i = 0; i < 12; i++) {
if (!strcmp (tokens[1], months[i])) {
break;
}
}
if (i == 12)
goto out;
g_date_set_month (date, i + 1);
d = g_ascii_strtoull (tokens[2], &endptr, 10);
if (d == 0 && *endptr != '\0')
goto out;
g_date_set_day (date, d);
d = g_ascii_strtoull (tokens[4], &endptr, 10);
if (d == 0 && *endptr != '\0')
goto out;
g_date_set_year (date, d);
out:
if (tokens)
g_strfreev (tokens);
}
}
static gboolean
gst_flv_demux_parse_metadata_item (GstFlvDemux * demux, GstByteReader * reader,
gboolean * end_marker)
{
gchar *tag_name = NULL;
guint8 tag_type = 0;
/* Initialize the end_marker flag to FALSE */
*end_marker = FALSE;
/* Name of the tag */
tag_name = FLV_GET_STRING (reader);
if (G_UNLIKELY (!tag_name)) {
GST_WARNING_OBJECT (demux, "failed reading tag name");
return FALSE;
}
/* What kind of object is that */
if (!gst_byte_reader_get_uint8 (reader, &tag_type))
goto error;
GST_DEBUG_OBJECT (demux, "tag name %s, tag type %d", tag_name, tag_type);
switch (tag_type) {
case 0: // Double
{ /* Use a union to read the uint64 and then as a double */
gdouble d = 0;
if (!gst_byte_reader_get_float64_be (reader, &d))
goto error;
GST_DEBUG_OBJECT (demux, "%s => (double) %f", tag_name, d);
if (!strcmp (tag_name, "duration")) {
demux->duration = d * GST_SECOND;
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_DURATION, demux->duration, NULL);
} else if (!strcmp (tag_name, "AspectRatioX")) {
demux->par_x = d;
demux->got_par = TRUE;
} else if (!strcmp (tag_name, "AspectRatioY")) {
demux->par_y = d;
demux->got_par = TRUE;
} else if (!strcmp (tag_name, "width")) {
demux->w = d;
} else if (!strcmp (tag_name, "height")) {
demux->h = d;
} else if (!strcmp (tag_name, "framerate")) {
demux->framerate = d;
} else {
GST_INFO_OBJECT (demux, "Tag \'%s\' not handled", tag_name);
}
break;
}
case 1: // Boolean
{
guint8 b = 0;
if (!gst_byte_reader_get_uint8 (reader, &b))
goto error;
GST_DEBUG_OBJECT (demux, "%s => (boolean) %d", tag_name, b);
GST_INFO_OBJECT (demux, "Tag \'%s\' not handled", tag_name);
break;
}
case 2: // String
{
gchar *s = NULL;
s = FLV_GET_STRING (reader);
if (s == NULL)
goto error;
GST_DEBUG_OBJECT (demux, "%s => (string) %s", tag_name, s);
if (!strcmp (tag_name, "creationdate")) {
GDate *date = g_date_new ();
parse_flv_demux_parse_date_string (date, s);
if (!g_date_valid (date)) {
GST_DEBUG_OBJECT (demux, "Failed to parse string as date");
} else {
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_DATE, date, NULL);
}
g_date_free (date);
} else if (!strcmp (tag_name, "creator")) {
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_ARTIST, s, NULL);
} else if (!strcmp (tag_name, "title")) {
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_TITLE, s, NULL);
} else if (!strcmp (tag_name, "metadatacreator")) {
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER, s, NULL);
} else {
GST_INFO_OBJECT (demux, "Tag \'%s\' not handled", tag_name);
}
g_free (s);
break;
}
case 3: // Object
{
gboolean end_of_object_marker = FALSE;
while (!end_of_object_marker) {
gboolean ok = gst_flv_demux_parse_metadata_item (demux, reader,
&end_of_object_marker);
if (G_UNLIKELY (!ok)) {
GST_WARNING_OBJECT (demux, "failed reading a tag, skipping");
goto error;
}
}
break;
}
case 8: // ECMA array
{
guint32 nb_elems = 0;
gboolean end_of_object_marker = FALSE;
if (!gst_byte_reader_get_uint32_be (reader, &nb_elems))
goto error;
GST_DEBUG_OBJECT (demux, "there are approx. %d elements in the array",
nb_elems);
while (!end_of_object_marker) {
gboolean ok = gst_flv_demux_parse_metadata_item (demux, reader,
&end_of_object_marker);
if (G_UNLIKELY (!ok)) {
GST_WARNING_OBJECT (demux, "failed reading a tag, skipping");
goto error;
}
}
break;
}
case 9: // End marker
{
GST_DEBUG_OBJECT (demux, "end marker ?");
if (tag_name[0] == '\0') {
GST_DEBUG_OBJECT (demux, "end marker detected");
*end_marker = TRUE;
}
break;
}
case 10: // Array
{
guint32 nb_elems = 0;
if (!gst_byte_reader_get_uint32_be (reader, &nb_elems))
goto error;
GST_DEBUG_OBJECT (demux, "array has %d elements", nb_elems);
if (!strcmp (tag_name, "times")) {
if (demux->times) {
g_array_free (demux->times, TRUE);
}
demux->times = g_array_new (FALSE, TRUE, sizeof (gdouble));
} else if (!strcmp (tag_name, "filepositions")) {
if (demux->filepositions) {
g_array_free (demux->filepositions, TRUE);
}
demux->filepositions = g_array_new (FALSE, TRUE, sizeof (gdouble));
}
while (nb_elems--) {
guint8 elem_type = 0;
if (!gst_byte_reader_get_uint8 (reader, &elem_type))
goto error;
switch (elem_type) {
case 0:
{
gdouble d;
if (!gst_byte_reader_get_float64_be (reader, &d))
goto error;
GST_DEBUG_OBJECT (demux, "element is a double %f", d);
if (!strcmp (tag_name, "times") && demux->times) {
g_array_append_val (demux->times, d);
} else if (!strcmp (tag_name, "filepositions") &&
demux->filepositions) {
g_array_append_val (demux->filepositions, d);
}
break;
}
default:
GST_WARNING_OBJECT (demux, "unsupported array element type %d",
elem_type);
}
}
break;
}
case 11: // Date
{
gdouble d = 0;
gint16 i = 0;
if (!gst_byte_reader_get_float64_be (reader, &d))
goto error;
if (!gst_byte_reader_get_int16_be (reader, &i))
goto error;
GST_DEBUG_OBJECT (demux,
"%s => (date as a double) %f, timezone offset %d", tag_name, d, i);
GST_INFO_OBJECT (demux, "Tag \'%s\' not handled", tag_name);
break;
}
default:
GST_WARNING_OBJECT (demux, "unsupported tag type %d", tag_type);
}
g_free (tag_name);
return TRUE;
error:
g_free (tag_name);
return FALSE;
}
static GstFlowReturn
gst_flv_demux_parse_tag_script (GstFlvDemux * demux, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buffer);
guint8 type = 0;
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) >= 7, GST_FLOW_ERROR);
gst_byte_reader_skip (&reader, 7);
GST_LOG_OBJECT (demux, "parsing a script tag");
if (!gst_byte_reader_get_uint8 (&reader, &type))
return GST_FLOW_OK;
/* Must be string */
if (type == 2) {
gchar *function_name;
guint i;
function_name = FLV_GET_STRING (&reader);
GST_LOG_OBJECT (demux, "function name is %s", GST_STR_NULL (function_name));
if (function_name != NULL && strcmp (function_name, "onMetaData") == 0) {
gboolean end_marker = FALSE;
GST_DEBUG_OBJECT (demux, "we have a metadata script object");
if (!gst_byte_reader_get_uint8 (&reader, &type)) {
g_free (function_name);
return GST_FLOW_OK;
}
switch (type) {
case 8:
{
guint32 nb_elems = 0;
/* ECMA array */
if (!gst_byte_reader_get_uint32_be (&reader, &nb_elems)) {
g_free (function_name);
return GST_FLOW_OK;
}
/* The number of elements is just a hint, some files have
nb_elements == 0 and actually contain items. */
GST_DEBUG_OBJECT (demux, "there are approx. %d elements in the array",
nb_elems);
}
/* fallthrough to read data */
case 3:
{
/* Object */
while (!end_marker) {
gboolean ok =
gst_flv_demux_parse_metadata_item (demux, &reader, &end_marker);
if (G_UNLIKELY (!ok)) {
GST_WARNING_OBJECT (demux, "failed reading a tag, skipping");
break;
}
}
}
break;
default:
GST_DEBUG_OBJECT (demux, "Unhandled script data type : %d", type);
g_free (function_name);
return GST_FLOW_OK;
}
demux->push_tags = TRUE;
}
g_free (function_name);
if (demux->index && demux->times && demux->filepositions) {
guint num;
/* If an index was found, insert associations */
num = MIN (demux->times->len, demux->filepositions->len);
for (i = 0; i < num; i++) {
guint64 time, fileposition;
time = g_array_index (demux->times, gdouble, i) * GST_SECOND;
fileposition = g_array_index (demux->filepositions, gdouble, i);
gst_flv_demux_parse_and_add_index_entry (demux, time, fileposition,
TRUE);
}
demux->indexed = TRUE;
}
}
return ret;
}
static gboolean
gst_flv_demux_audio_negotiate (GstFlvDemux * demux, guint32 codec_tag,
guint32 rate, guint32 channels, guint32 width)
{
GstCaps *caps = NULL;
gchar *codec_name = NULL;
gboolean ret = FALSE;
guint adjusted_rate = rate;
switch (codec_tag) {
case 1:
caps = gst_caps_new_simple ("audio/x-adpcm", "layout", G_TYPE_STRING,
"swf", NULL);
break;
case 2:
case 14:
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 1, "layer", G_TYPE_INT, 3,
"parsed", G_TYPE_BOOLEAN, TRUE, NULL);
break;
case 0:
case 3:
/* Assuming little endian for 0 (aka endianness of the
* system on which the file was created) as most people
* are probably using little endian machines */
caps = gst_caps_new_simple ("audio/x-raw-int",
"endianness", G_TYPE_INT, G_LITTLE_ENDIAN,
"signed", G_TYPE_BOOLEAN, (width == 8) ? FALSE : TRUE,
"width", G_TYPE_INT, width, "depth", G_TYPE_INT, width, NULL);
break;
case 4:
case 5:
case 6:
caps = gst_caps_new_simple ("audio/x-nellymoser", NULL);
break;
case 10:
{
/* use codec-data to extract and verify samplerate */
if (demux->audio_codec_data &&
GST_BUFFER_SIZE (demux->audio_codec_data) >= 2) {
gint freq_index;
freq_index =
((GST_READ_UINT16_BE (GST_BUFFER_DATA (demux->audio_codec_data))));
freq_index = (freq_index & 0x0780) >> 7;
adjusted_rate =
gst_codec_utils_aac_get_sample_rate_from_index (freq_index);
if (adjusted_rate && (rate != adjusted_rate)) {
GST_LOG_OBJECT (demux, "Ajusting AAC sample rate %d -> %d", rate,
adjusted_rate);
} else {
adjusted_rate = rate;
}
}
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 4, "framed", G_TYPE_BOOLEAN, TRUE,
"stream-format", G_TYPE_STRING, "raw", NULL);
break;
}
case 7:
caps = gst_caps_new_simple ("audio/x-alaw", NULL);
break;
case 8:
caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
break;
case 11:
caps = gst_caps_new_simple ("audio/x-speex", NULL);
break;
default:
GST_WARNING_OBJECT (demux, "unsupported audio codec tag %u", codec_tag);
}
if (G_UNLIKELY (!caps)) {
GST_WARNING_OBJECT (demux, "failed creating caps for audio pad");
goto beach;
}
gst_caps_set_simple (caps, "rate", G_TYPE_INT, adjusted_rate,
"channels", G_TYPE_INT, channels, NULL);
if (demux->audio_codec_data) {
gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER,
demux->audio_codec_data, NULL);
}
ret = gst_pad_set_caps (demux->audio_pad, caps);
if (G_LIKELY (ret)) {
/* Store the caps we got from tags */
demux->audio_codec_tag = codec_tag;
demux->rate = rate;
demux->channels = channels;
demux->width = width;
codec_name = gst_pb_utils_get_codec_description (caps);
if (codec_name) {
if (demux->taglist == NULL)
demux->taglist = gst_tag_list_new ();
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_AUDIO_CODEC, codec_name, NULL);
g_free (codec_name);
}
GST_DEBUG_OBJECT (demux->audio_pad, "successfully negotiated caps %"
GST_PTR_FORMAT, caps);
} else {
GST_WARNING_OBJECT (demux->audio_pad, "failed negotiating caps %"
GST_PTR_FORMAT, caps);
}
gst_caps_unref (caps);
beach:
return ret;
}
static void
gst_flv_demux_push_tags (GstFlvDemux * demux)
{
if (demux->has_audio && !demux->audio_pad) {
GST_DEBUG_OBJECT (demux,
"Waiting for audio stream pad to come up before we can push tags");
return;
}
if (demux->has_video && !demux->video_pad) {
GST_DEBUG_OBJECT (demux,
"Waiting for video stream pad to come up before we can push tags");
return;
}
if (demux->taglist) {
GST_DEBUG_OBJECT (demux, "pushing tags out %" GST_PTR_FORMAT,
demux->taglist);
gst_element_found_tags (GST_ELEMENT (demux), demux->taglist);
demux->taglist = gst_tag_list_new ();
demux->push_tags = FALSE;
}
}
static void
gst_flv_demux_update_resync (GstFlvDemux * demux, guint32 pts, gboolean discont,
guint32 * last, GstClockTime * offset)
{
gint32 dpts = pts - *last;
if (!discont && ABS (dpts) >= RESYNC_THRESHOLD) {
/* Theoretically, we should use substract the duration of the last buffer,
but this demuxer sends no durations on buffers, not sure if it cannot
know, or just does not care to calculate. */
*offset -= dpts * GST_MSECOND;
GST_WARNING_OBJECT (demux,
"Large pts gap (%" G_GINT32_FORMAT " ms), assuming resync, offset now %"
GST_TIME_FORMAT "", dpts, GST_TIME_ARGS (*offset));
}
*last = pts;
}
static GstFlowReturn
gst_flv_demux_parse_tag_audio (GstFlvDemux * demux, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
guint32 pts = 0, codec_tag = 0, rate = 5512, width = 8, channels = 1;
guint32 codec_data = 0, pts_ext = 0;
guint8 flags = 0;
guint8 *data = GST_BUFFER_DATA (buffer);
GstBuffer *outbuf;
GST_LOG_OBJECT (demux, "parsing an audio tag");
if (demux->no_more_pads && !demux->audio_pad) {
GST_WARNING_OBJECT (demux,
"Signaled no-more-pads already but had no audio pad -- ignoring");
goto beach;
}
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) == demux->tag_size,
GST_FLOW_ERROR);
/* Grab information about audio tag */
pts = GST_READ_UINT24_BE (data);
/* read the pts extension to 32 bits integer */
pts_ext = GST_READ_UINT8 (data + 3);
/* Combine them */
pts |= pts_ext << 24;
GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X (%d)", data[0], data[1],
data[2], data[3], pts);
/* Error out on tags with too small headers */
if (GST_BUFFER_SIZE (buffer) < 11) {
GST_ERROR_OBJECT (demux, "Too small tag size (%d)",
GST_BUFFER_SIZE (buffer));
return GST_FLOW_ERROR;
}
/* Silently skip buffers with no data */
if (GST_BUFFER_SIZE (buffer) == 11)
return GST_FLOW_OK;
/* Skip the stream id and go directly to the flags */
flags = GST_READ_UINT8 (data + 7);
/* Channels */
if (flags & 0x01) {
channels = 2;
}
/* Width */
if (flags & 0x02) {
width = 16;
}
/* Sampling rate */
if ((flags & 0x0C) == 0x0C) {
rate = 44100;
} else if ((flags & 0x0C) == 0x08) {
rate = 22050;
} else if ((flags & 0x0C) == 0x04) {
rate = 11025;
}
/* Codec tag */
codec_tag = flags >> 4;
if (codec_tag == 10) { /* AAC has an extra byte for packet type */
codec_data = 2;
} else {
codec_data = 1;
}
/* codec tags with special rates */
if (codec_tag == 5 || codec_tag == 14)
rate = 8000;
else if (codec_tag == 4)
rate = 16000;
GST_LOG_OBJECT (demux, "audio tag with %d channels, %dHz sampling rate, "
"%d bits width, codec tag %u (flags %02X)", channels, rate, width,
codec_tag, flags);
/* If we don't have our audio pad created, then create it. */
if (G_UNLIKELY (!demux->audio_pad)) {
demux->audio_pad =
gst_pad_new_from_template (gst_element_class_get_pad_template
(GST_ELEMENT_GET_CLASS (demux), "audio"), "audio");
if (G_UNLIKELY (!demux->audio_pad)) {
GST_WARNING_OBJECT (demux, "failed creating audio pad");
ret = GST_FLOW_ERROR;
goto beach;
}
/* Negotiate caps */
if (!gst_flv_demux_audio_negotiate (demux, codec_tag, rate, channels,
width)) {
gst_object_unref (demux->audio_pad);
demux->audio_pad = NULL;
ret = GST_FLOW_ERROR;
goto beach;
}
GST_DEBUG_OBJECT (demux, "created audio pad with caps %" GST_PTR_FORMAT,
GST_PAD_CAPS (demux->audio_pad));
/* Set functions on the pad */
gst_pad_set_query_type_function (demux->audio_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_query_types));
gst_pad_set_query_function (demux->audio_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_query));
gst_pad_set_event_function (demux->audio_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_src_event));
gst_pad_use_fixed_caps (demux->audio_pad);
/* Make it active */
gst_pad_set_active (demux->audio_pad, TRUE);
/* We need to set caps before adding */
gst_element_add_pad (GST_ELEMENT (demux),
gst_object_ref (demux->audio_pad));
/* We only emit no more pads when we have audio and video. Indeed we can
* not trust the FLV header to tell us if there will be only audio or
* only video and we would just break discovery of some files */
if (demux->audio_pad && demux->video_pad) {
GST_DEBUG_OBJECT (demux, "emitting no more pads");
gst_element_no_more_pads (GST_ELEMENT (demux));
demux->no_more_pads = TRUE;
demux->push_tags = TRUE;
}
}
/* Check if caps have changed */
if (G_UNLIKELY (rate != demux->rate || channels != demux->channels ||
codec_tag != demux->audio_codec_tag || width != demux->width)) {
GST_DEBUG_OBJECT (demux, "audio settings have changed, changing caps");
/* Negotiate caps */
if (!gst_flv_demux_audio_negotiate (demux, codec_tag, rate, channels,
width)) {
ret = GST_FLOW_ERROR;
goto beach;
}
}
/* Push taglist if present */
if (G_UNLIKELY (demux->push_tags))
gst_flv_demux_push_tags (demux);
/* Check if we have anything to push */
if (demux->tag_data_size <= codec_data) {
GST_LOG_OBJECT (demux, "Nothing left in this tag, returning");
goto beach;
}
/* Create buffer from pad */
outbuf =
gst_buffer_create_sub (buffer, 7 + codec_data,
demux->tag_data_size - codec_data);
if (demux->audio_codec_tag == 10) {
guint8 aac_packet_type = GST_READ_UINT8 (data + 8);
switch (aac_packet_type) {
case 0:
{
/* AudioSpecificConfig data */
GST_LOG_OBJECT (demux, "got an AAC codec data packet");
if (demux->audio_codec_data) {
gst_buffer_unref (demux->audio_codec_data);
}
demux->audio_codec_data = outbuf;
/* Use that buffer data in the caps */
gst_flv_demux_audio_negotiate (demux, codec_tag, rate, channels, width);
goto beach;
break;
}
case 1:
/* AAC raw packet */
GST_LOG_OBJECT (demux, "got a raw AAC audio packet");
break;
default:
GST_WARNING_OBJECT (demux, "invalid AAC packet type %u",
aac_packet_type);
}
}
/* detect (and deem to be resyncs) large pts gaps */
gst_flv_demux_update_resync (demux, pts, demux->audio_need_discont,
&demux->last_audio_pts, &demux->audio_time_offset);
/* Fill buffer with data */
GST_BUFFER_TIMESTAMP (outbuf) = pts * GST_MSECOND + demux->audio_time_offset;
GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (outbuf) = demux->audio_offset++;
GST_BUFFER_OFFSET_END (outbuf) = demux->audio_offset;
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (demux->audio_pad));
if (demux->duration == GST_CLOCK_TIME_NONE ||
demux->duration < GST_BUFFER_TIMESTAMP (outbuf))
demux->duration = GST_BUFFER_TIMESTAMP (outbuf);
/* Only add audio frames to the index if we have no video,
* and if the index is not yet complete */
if (!demux->has_video && demux->index && !demux->indexed) {
gst_flv_demux_parse_and_add_index_entry (demux,
GST_BUFFER_TIMESTAMP (outbuf), demux->cur_tag_offset, TRUE);
}
if (G_UNLIKELY (demux->audio_need_discont)) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
demux->audio_need_discont = FALSE;
}
gst_segment_set_last_stop (&demux->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (outbuf));
/* Do we need a newsegment event ? */
if (G_UNLIKELY (demux->audio_need_segment)) {
if (demux->close_seg_event)
gst_pad_push_event (demux->audio_pad,
gst_event_ref (demux->close_seg_event));
if (!demux->new_seg_event) {
GST_DEBUG_OBJECT (demux, "pushing newsegment from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.last_stop),
GST_TIME_ARGS (demux->segment.stop));
demux->new_seg_event =
gst_event_new_new_segment (FALSE, demux->segment.rate,
demux->segment.format, demux->segment.last_stop,
demux->segment.stop, demux->segment.last_stop);
} else {
GST_DEBUG_OBJECT (demux, "pushing pre-generated newsegment event");
}
gst_pad_push_event (demux->audio_pad, gst_event_ref (demux->new_seg_event));
demux->audio_need_segment = FALSE;
}
GST_LOG_OBJECT (demux, "pushing %d bytes buffer at pts %" GST_TIME_FORMAT
" with duration %" GST_TIME_FORMAT ", offset %" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (outbuf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)), GST_BUFFER_OFFSET (outbuf));
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_start)) {
demux->audio_start = GST_BUFFER_TIMESTAMP (outbuf);
}
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts)) {
demux->audio_first_ts = GST_BUFFER_TIMESTAMP (outbuf);
}
if (G_UNLIKELY (!demux->no_more_pads
&& (GST_CLOCK_DIFF (demux->audio_start,
GST_BUFFER_TIMESTAMP (outbuf)) > 6 * GST_SECOND))) {
GST_DEBUG_OBJECT (demux,
"Signalling no-more-pads because no video stream was found"
" after 6 seconds of audio");
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
demux->no_more_pads = TRUE;
demux->push_tags = TRUE;
}
/* Push downstream */
ret = gst_pad_push (demux->audio_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (demux->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
demux->segment.last_stop > demux->segment.stop) {
/* In reverse playback we can get a GST_FLOW_UNEXPECTED when
* we are at the end of the segment, so we just need to jump
* back to the previous section. */
GST_DEBUG_OBJECT (demux, "downstream has reached end of segment");
demux->audio_done = TRUE;
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux, "failed pushing a %" G_GUINT64_FORMAT
" bytes audio buffer: %s", demux->tag_data_size,
gst_flow_get_name (ret));
if (ret == GST_FLOW_NOT_LINKED) {
demux->audio_linked = FALSE;
}
goto beach;
}
}
demux->audio_linked = TRUE;
beach:
return ret;
}
static gboolean
gst_flv_demux_video_negotiate (GstFlvDemux * demux, guint32 codec_tag)
{
gboolean ret = FALSE;
GstCaps *caps = NULL;
gchar *codec_name = NULL;
/* Generate caps for that pad */
switch (codec_tag) {
case 2:
caps = gst_caps_new_simple ("video/x-flash-video", NULL);
break;
case 3:
caps = gst_caps_new_simple ("video/x-flash-screen", NULL);
break;
case 4:
caps = gst_caps_new_simple ("video/x-vp6-flash", NULL);
break;
case 5:
caps = gst_caps_new_simple ("video/x-vp6-alpha", NULL);
break;
case 7:
caps =
gst_caps_new_simple ("video/x-h264", "stream-format", G_TYPE_STRING,
"avc", NULL);
break;
default:
GST_WARNING_OBJECT (demux, "unsupported video codec tag %u", codec_tag);
}
if (G_UNLIKELY (!caps)) {
GST_WARNING_OBJECT (demux, "failed creating caps for video pad");
goto beach;
}
gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION,
demux->par_x, demux->par_y, NULL);
if (G_LIKELY (demux->w)) {
gst_caps_set_simple (caps, "width", G_TYPE_INT, demux->w, NULL);
}
if (G_LIKELY (demux->h)) {
gst_caps_set_simple (caps, "height", G_TYPE_INT, demux->h, NULL);
}
if (G_LIKELY (demux->framerate)) {
gint num = 0, den = 0;
gst_util_double_to_fraction (demux->framerate, &num, &den);
GST_DEBUG_OBJECT (demux->video_pad,
"fps to be used on caps %f (as a fraction = %d/%d)", demux->framerate,
num, den);
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, num, den, NULL);
}
if (demux->video_codec_data) {
gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER,
demux->video_codec_data, NULL);
}
ret = gst_pad_set_caps (demux->video_pad, caps);
if (G_LIKELY (ret)) {
/* Store the caps we have set */
demux->video_codec_tag = codec_tag;
codec_name = gst_pb_utils_get_codec_description (caps);
if (codec_name) {
if (demux->taglist == NULL)
demux->taglist = gst_tag_list_new ();
gst_tag_list_add (demux->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_VIDEO_CODEC, codec_name, NULL);
g_free (codec_name);
}
GST_DEBUG_OBJECT (demux->video_pad, "successfully negotiated caps %"
GST_PTR_FORMAT, caps);
} else {
GST_WARNING_OBJECT (demux->video_pad, "failed negotiating caps %"
GST_PTR_FORMAT, caps);
}
gst_caps_unref (caps);
beach:
return ret;
}
static GstFlowReturn
gst_flv_demux_parse_tag_video (GstFlvDemux * demux, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
guint32 pts = 0, codec_data = 1, pts_ext = 0;
gboolean keyframe = FALSE;
guint8 flags = 0, codec_tag = 0;
guint8 *data = GST_BUFFER_DATA (buffer);
GstBuffer *outbuf;
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) == demux->tag_size,
GST_FLOW_ERROR);
GST_LOG_OBJECT (demux, "parsing a video tag");
if (demux->no_more_pads && !demux->video_pad) {
GST_WARNING_OBJECT (demux,
"Signaled no-more-pads already but had no audio pad -- ignoring");
goto beach;
}
/* Grab information about video tag */
pts = GST_READ_UINT24_BE (data);
/* read the pts extension to 32 bits integer */
pts_ext = GST_READ_UINT8 (data + 3);
/* Combine them */
pts |= pts_ext << 24;
GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X (%d)", data[0], data[1],
data[2], data[3], pts);
if (GST_BUFFER_SIZE (buffer) < 12) {
GST_ERROR_OBJECT (demux, "Too small tag size");
return GST_FLOW_ERROR;
}
/* Skip the stream id and go directly to the flags */
flags = GST_READ_UINT8 (data + 7);
/* Keyframe */
if ((flags >> 4) == 1) {
keyframe = TRUE;
}
/* Codec tag */
codec_tag = flags & 0x0F;
if (codec_tag == 4 || codec_tag == 5) {
codec_data = 2;
} else if (codec_tag == 7) {
gint32 cts;
codec_data = 5;
cts = GST_READ_UINT24_BE (data + 9);
cts = (cts + 0xff800000) ^ 0xff800000;
GST_LOG_OBJECT (demux, "got cts %d", cts);
/* avoid negative overflow */
if (cts >= 0 || pts >= -cts)
pts += cts;
}
GST_LOG_OBJECT (demux, "video tag with codec tag %u, keyframe (%d) "
"(flags %02X)", codec_tag, keyframe, flags);
/* If we don't have our video pad created, then create it. */
if (G_UNLIKELY (!demux->video_pad)) {
demux->video_pad =
gst_pad_new_from_template (gst_element_class_get_pad_template
(GST_ELEMENT_GET_CLASS (demux), "video"), "video");
if (G_UNLIKELY (!demux->video_pad)) {
GST_WARNING_OBJECT (demux, "failed creating video pad");
ret = GST_FLOW_ERROR;
goto beach;
}
if (!gst_flv_demux_video_negotiate (demux, codec_tag)) {
gst_object_unref (demux->video_pad);
demux->video_pad = NULL;
ret = GST_FLOW_ERROR;
goto beach;
}
/* When we ve set pixel-aspect-ratio we use that boolean to detect a
* metadata tag that would come later and trigger a caps change */
demux->got_par = FALSE;
GST_DEBUG_OBJECT (demux, "created video pad with caps %" GST_PTR_FORMAT,
GST_PAD_CAPS (demux->video_pad));
/* Set functions on the pad */
gst_pad_set_query_type_function (demux->video_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_query_types));
gst_pad_set_query_function (demux->video_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_query));
gst_pad_set_event_function (demux->video_pad,
GST_DEBUG_FUNCPTR (gst_flv_demux_src_event));
gst_pad_use_fixed_caps (demux->video_pad);
/* Make it active */
gst_pad_set_active (demux->video_pad, TRUE);
/* We need to set caps before adding */
gst_element_add_pad (GST_ELEMENT (demux),
gst_object_ref (demux->video_pad));
/* We only emit no more pads when we have audio and video. Indeed we can
* not trust the FLV header to tell us if there will be only audio or
* only video and we would just break discovery of some files */
if (demux->audio_pad && demux->video_pad) {
GST_DEBUG_OBJECT (demux, "emitting no more pads");
gst_element_no_more_pads (GST_ELEMENT (demux));
demux->no_more_pads = TRUE;
demux->push_tags = TRUE;
}
}
/* Check if caps have changed */
if (G_UNLIKELY (codec_tag != demux->video_codec_tag || demux->got_par)) {
GST_DEBUG_OBJECT (demux, "video settings have changed, changing caps");
if (!gst_flv_demux_video_negotiate (demux, codec_tag)) {
ret = GST_FLOW_ERROR;
goto beach;
}
/* When we ve set pixel-aspect-ratio we use that boolean to detect a
* metadata tag that would come later and trigger a caps change */
demux->got_par = FALSE;
}
/* Push taglist if present */
if (G_UNLIKELY (demux->push_tags))
gst_flv_demux_push_tags (demux);
/* Check if we have anything to push */
if (demux->tag_data_size <= codec_data) {
GST_LOG_OBJECT (demux, "Nothing left in this tag, returning");
goto beach;
}
/* Create buffer from pad */
outbuf =
gst_buffer_create_sub (buffer, 7 + codec_data,
demux->tag_data_size - codec_data);
if (demux->video_codec_tag == 7) {
guint8 avc_packet_type = GST_READ_UINT8 (data + 8);
switch (avc_packet_type) {
case 0:
{
/* AVCDecoderConfigurationRecord data */
GST_LOG_OBJECT (demux, "got an H.264 codec data packet");
if (demux->video_codec_data) {
gst_buffer_unref (demux->video_codec_data);
}
demux->video_codec_data = outbuf;
/* Use that buffer data in the caps */
gst_flv_demux_video_negotiate (demux, codec_tag);
goto beach;
break;
}
case 1:
/* H.264 NALU packet */
GST_LOG_OBJECT (demux, "got a H.264 NALU video packet");
break;
default:
GST_WARNING_OBJECT (demux, "invalid video packet type %u",
avc_packet_type);
}
}
/* detect (and deem to be resyncs) large pts gaps */
gst_flv_demux_update_resync (demux, pts, demux->video_need_discont,
&demux->last_video_pts, &demux->video_time_offset);
/* Fill buffer with data */
GST_BUFFER_TIMESTAMP (outbuf) = pts * GST_MSECOND + demux->video_time_offset;
GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (outbuf) = demux->video_offset++;
GST_BUFFER_OFFSET_END (outbuf) = demux->video_offset;
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (demux->video_pad));
if (demux->duration == GST_CLOCK_TIME_NONE ||
demux->duration < GST_BUFFER_TIMESTAMP (outbuf))
demux->duration = GST_BUFFER_TIMESTAMP (outbuf);
if (!keyframe)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
if (!demux->indexed && demux->index) {
gst_flv_demux_parse_and_add_index_entry (demux,
GST_BUFFER_TIMESTAMP (outbuf), demux->cur_tag_offset, keyframe);
}
if (G_UNLIKELY (demux->video_need_discont)) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
demux->video_need_discont = FALSE;
}
gst_segment_set_last_stop (&demux->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (outbuf));
/* Do we need a newsegment event ? */
if (G_UNLIKELY (demux->video_need_segment)) {
if (demux->close_seg_event)
gst_pad_push_event (demux->video_pad,
gst_event_ref (demux->close_seg_event));
if (!demux->new_seg_event) {
GST_DEBUG_OBJECT (demux, "pushing newsegment from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.last_stop),
GST_TIME_ARGS (demux->segment.stop));
demux->new_seg_event =
gst_event_new_new_segment (FALSE, demux->segment.rate,
demux->segment.format, demux->segment.last_stop,
demux->segment.stop, demux->segment.last_stop);
} else {
GST_DEBUG_OBJECT (demux, "pushing pre-generated newsegment event");
}
gst_pad_push_event (demux->video_pad, gst_event_ref (demux->new_seg_event));
demux->video_need_segment = FALSE;
}
GST_LOG_OBJECT (demux, "pushing %d bytes buffer at pts %" GST_TIME_FORMAT
" with duration %" GST_TIME_FORMAT ", offset %" G_GUINT64_FORMAT
", keyframe (%d)", GST_BUFFER_SIZE (outbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)), GST_BUFFER_OFFSET (outbuf),
keyframe);
if (!GST_CLOCK_TIME_IS_VALID (demux->video_start)) {
demux->video_start = GST_BUFFER_TIMESTAMP (outbuf);
}
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts)) {
demux->video_first_ts = GST_BUFFER_TIMESTAMP (outbuf);
}
if (G_UNLIKELY (!demux->no_more_pads
&& (GST_CLOCK_DIFF (demux->video_start,
GST_BUFFER_TIMESTAMP (outbuf)) > 6 * GST_SECOND))) {
GST_DEBUG_OBJECT (demux,
"Signalling no-more-pads because no audio stream was found"
" after 6 seconds of video");
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
demux->no_more_pads = TRUE;
demux->push_tags = TRUE;
}
/* Push downstream */
ret = gst_pad_push (demux->video_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (demux->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
demux->segment.last_stop > demux->segment.stop) {
/* In reverse playback we can get a GST_FLOW_UNEXPECTED when
* we are at the end of the segment, so we just need to jump
* back to the previous section. */
GST_DEBUG_OBJECT (demux, "downstream has reached end of segment");
demux->video_done = TRUE;
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux, "failed pushing a %" G_GUINT64_FORMAT
" bytes video buffer: %s", demux->tag_data_size,
gst_flow_get_name (ret));
if (ret == GST_FLOW_NOT_LINKED) {
demux->video_linked = FALSE;
}
goto beach;
}
}
demux->video_linked = TRUE;
beach:
return ret;
}
static GstClockTime
gst_flv_demux_parse_tag_timestamp (GstFlvDemux * demux, gboolean index,
GstBuffer * buffer, size_t * tag_size)
{
guint32 pts = 0, pts_ext = 0;
guint32 tag_data_size;
guint8 type;
gboolean keyframe = TRUE;
GstClockTime ret;
guint8 *data = GST_BUFFER_DATA (buffer);
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) >= 12, GST_CLOCK_TIME_NONE);
type = data[0];
if (type != 9 && type != 8 && type != 18) {
GST_WARNING_OBJECT (demux, "Unsupported tag type %u", data[0]);
return GST_CLOCK_TIME_NONE;
}
if (type == 9)
demux->has_video = TRUE;
else if (type == 8)
demux->has_audio = TRUE;
tag_data_size = GST_READ_UINT24_BE (data + 1);
if (GST_BUFFER_SIZE (buffer) >= tag_data_size + 11 + 4) {
if (GST_READ_UINT32_BE (data + tag_data_size + 11) != tag_data_size + 11) {
GST_WARNING_OBJECT (demux, "Invalid tag size");
return GST_CLOCK_TIME_NONE;
}
}
if (tag_size)
*tag_size = tag_data_size + 11 + 4;
data += 4;
GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X", data[0], data[1],
data[2], data[3]);
/* Grab timestamp of tag tag */
pts = GST_READ_UINT24_BE (data);
/* read the pts extension to 32 bits integer */
pts_ext = GST_READ_UINT8 (data + 3);
/* Combine them */
pts |= pts_ext << 24;
if (type == 9) {
data += 7;
keyframe = ((data[0] >> 4) == 1);
}
ret = pts * GST_MSECOND;
GST_LOG_OBJECT (demux, "pts: %" GST_TIME_FORMAT, GST_TIME_ARGS (ret));
if (index && demux->index && !demux->indexed && (type == 9 || (type == 8
&& !demux->has_video))) {
gst_flv_demux_parse_and_add_index_entry (demux, ret, demux->offset,
keyframe);
}
if (demux->duration == GST_CLOCK_TIME_NONE || demux->duration < ret)
demux->duration = ret;
return ret;
}
static GstFlowReturn
gst_flv_demux_parse_tag_type (GstFlvDemux * demux, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
guint8 tag_type = 0;
guint8 *data = GST_BUFFER_DATA (buffer);
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) >= 4, GST_FLOW_ERROR);
tag_type = data[0];
switch (tag_type) {
case 9:
demux->state = FLV_STATE_TAG_VIDEO;
demux->has_video = TRUE;
break;
case 8:
demux->state = FLV_STATE_TAG_AUDIO;
demux->has_audio = TRUE;
break;
case 18:
demux->state = FLV_STATE_TAG_SCRIPT;
break;
default:
GST_WARNING_OBJECT (demux, "unsupported tag type %u", tag_type);
}
/* Tag size is 1 byte of type + 3 bytes of size + 7 bytes + tag data size +
* 4 bytes of previous tag size */
demux->tag_data_size = GST_READ_UINT24_BE (data + 1);
demux->tag_size = demux->tag_data_size + 11;
GST_LOG_OBJECT (demux, "tag data size is %" G_GUINT64_FORMAT,
demux->tag_data_size);
return ret;
}
static GstFlowReturn
gst_flv_demux_parse_header (GstFlvDemux * demux, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
guint8 *data = GST_BUFFER_DATA (buffer);
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) >= 9, GST_FLOW_ERROR);
/* Check for the FLV tag */
if (data[0] == 'F' && data[1] == 'L' && data[2] == 'V') {
GST_DEBUG_OBJECT (demux, "FLV header detected");
} else {
if (G_UNLIKELY (demux->strict)) {
GST_WARNING_OBJECT (demux, "invalid header tag detected");
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
}
/* Jump over the 4 first bytes */
data += 4;
/* Now look at audio/video flags */
{
guint8 flags = data[0];
demux->has_video = demux->has_audio = FALSE;
if (flags & 1) {
GST_DEBUG_OBJECT (demux, "there is a video stream");
demux->has_video = TRUE;
}
if (flags & 4) {
GST_DEBUG_OBJECT (demux, "there is an audio stream");
demux->has_audio = TRUE;
}
}
/* do a one-time seekability check */
gst_flv_demux_check_seekability (demux);
/* We don't care about the rest */
demux->need_header = FALSE;
beach:
return ret;
}
static void
gst_flv_demux_flush (GstFlvDemux * demux, gboolean discont)
{
GST_DEBUG_OBJECT (demux, "flushing queued data in the FLV demuxer");
gst_adapter_clear (demux->adapter);
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
demux->flushing = FALSE;
/* Only in push mode and if we're not during a seek */
if (!demux->random_access && demux->state != FLV_STATE_SEEK) {
/* After a flush we expect a tag_type */
demux->state = FLV_STATE_TAG_TYPE;
/* We reset the offset and will get one from first push */
demux->offset = 0;
}
}
static void
gst_flv_demux_cleanup (GstFlvDemux * demux)
{
GST_DEBUG_OBJECT (demux, "cleaning up FLV demuxer");
demux->state = FLV_STATE_HEADER;
demux->flushing = FALSE;
demux->need_header = TRUE;
demux->audio_need_segment = TRUE;
demux->video_need_segment = TRUE;
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
/* By default we consider them as linked */
demux->audio_linked = TRUE;
demux->video_linked = TRUE;
demux->has_audio = FALSE;
demux->has_video = FALSE;
demux->push_tags = FALSE;
demux->got_par = FALSE;
demux->indexed = FALSE;
demux->upstream_seekable = FALSE;
demux->file_size = 0;
demux->index_max_pos = 0;
demux->index_max_time = 0;
demux->audio_start = demux->video_start = GST_CLOCK_TIME_NONE;
demux->last_audio_pts = demux->last_video_pts = 0;
demux->audio_time_offset = demux->video_time_offset = 0;
demux->no_more_pads = FALSE;
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->w = demux->h = 0;
demux->framerate = 0.0;
demux->par_x = demux->par_y = 1;
demux->video_offset = 0;
demux->audio_offset = 0;
demux->offset = demux->cur_tag_offset = 0;
demux->tag_size = demux->tag_data_size = 0;
demux->duration = GST_CLOCK_TIME_NONE;
if (demux->new_seg_event) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->close_seg_event) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
gst_adapter_clear (demux->adapter);
if (demux->audio_codec_data) {
gst_buffer_unref (demux->audio_codec_data);
demux->audio_codec_data = NULL;
}
if (demux->video_codec_data) {
gst_buffer_unref (demux->video_codec_data);
demux->video_codec_data = NULL;
}
if (demux->audio_pad) {
gst_element_remove_pad (GST_ELEMENT (demux), demux->audio_pad);
gst_object_unref (demux->audio_pad);
demux->audio_pad = NULL;
}
if (demux->video_pad) {
gst_element_remove_pad (GST_ELEMENT (demux), demux->video_pad);
gst_object_unref (demux->video_pad);
demux->video_pad = NULL;
}
if (demux->times) {
g_array_free (demux->times, TRUE);
demux->times = NULL;
}
if (demux->filepositions) {
g_array_free (demux->filepositions, TRUE);
demux->filepositions = NULL;
}
}
/*
* Create and push a flushing seek event upstream
*/
static gboolean
flv_demux_seek_to_offset (GstFlvDemux * demux, guint64 offset)
{
GstEvent *event;
gboolean res = 0;
GST_DEBUG_OBJECT (demux, "Seeking to %" G_GUINT64_FORMAT, offset);
event =
gst_event_new_seek (1.0, GST_FORMAT_BYTES,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, offset,
GST_SEEK_TYPE_NONE, -1);
res = gst_pad_push_event (demux->sinkpad, event);
if (res)
demux->offset = offset;
return res;
}
static GstFlowReturn
gst_flv_demux_chain (GstPad * pad, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstFlvDemux *demux = NULL;
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
GST_LOG_OBJECT (demux, "received buffer of %d bytes at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
if (G_UNLIKELY (GST_BUFFER_OFFSET (buffer) == 0)) {
GST_DEBUG_OBJECT (demux, "beginning of file, expect header");
demux->state = FLV_STATE_HEADER;
demux->offset = 0;
}
if (G_UNLIKELY (demux->offset == 0 && GST_BUFFER_OFFSET (buffer) != 0)) {
GST_DEBUG_OBJECT (demux, "offset was zero, synchronizing with buffer's");
demux->offset = GST_BUFFER_OFFSET (buffer);
}
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
GST_DEBUG_OBJECT (demux, "Discontinuity");
gst_adapter_clear (demux->adapter);
}
gst_adapter_push (demux->adapter, buffer);
if (demux->seeking) {
demux->state = FLV_STATE_SEEK;
GST_OBJECT_LOCK (demux);
demux->seeking = FALSE;
GST_OBJECT_UNLOCK (demux);
}
parse:
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (ret == GST_FLOW_NOT_LINKED && (demux->audio_linked
|| demux->video_linked)) {
ret = GST_FLOW_OK;
} else {
GST_DEBUG_OBJECT (demux, "got flow return %s", gst_flow_get_name (ret));
goto beach;
}
}
if (G_UNLIKELY (demux->flushing)) {
GST_DEBUG_OBJECT (demux, "we are now flushing, exiting parser loop");
ret = GST_FLOW_WRONG_STATE;
goto beach;
}
switch (demux->state) {
case FLV_STATE_HEADER:
{
if (gst_adapter_available (demux->adapter) >= FLV_HEADER_SIZE) {
GstBuffer *buffer;
buffer = gst_adapter_take_buffer (demux->adapter, FLV_HEADER_SIZE);
ret = gst_flv_demux_parse_header (demux, buffer);
gst_buffer_unref (buffer);
demux->offset += FLV_HEADER_SIZE;
demux->state = FLV_STATE_TAG_TYPE;
goto parse;
} else {
goto beach;
}
}
case FLV_STATE_TAG_TYPE:
{
if (gst_adapter_available (demux->adapter) >= FLV_TAG_TYPE_SIZE) {
GstBuffer *buffer;
/* Remember the tag offset in bytes */
demux->cur_tag_offset = demux->offset;
buffer = gst_adapter_take_buffer (demux->adapter, FLV_TAG_TYPE_SIZE);
ret = gst_flv_demux_parse_tag_type (demux, buffer);
gst_buffer_unref (buffer);
demux->offset += FLV_TAG_TYPE_SIZE;
/* last tag is not an index => no index/don't know where the index is
* seek back to the beginning */
if (demux->seek_event && demux->state != FLV_STATE_TAG_SCRIPT)
goto no_index;
goto parse;
} else {
goto beach;
}
}
case FLV_STATE_TAG_VIDEO:
{
if (gst_adapter_available (demux->adapter) >= demux->tag_size) {
GstBuffer *buffer;
buffer = gst_adapter_take_buffer (demux->adapter, demux->tag_size);
ret = gst_flv_demux_parse_tag_video (demux, buffer);
gst_buffer_unref (buffer);
demux->offset += demux->tag_size;
demux->state = FLV_STATE_TAG_TYPE;
goto parse;
} else {
goto beach;
}
}
case FLV_STATE_TAG_AUDIO:
{
if (gst_adapter_available (demux->adapter) >= demux->tag_size) {
GstBuffer *buffer;
buffer = gst_adapter_take_buffer (demux->adapter, demux->tag_size);
ret = gst_flv_demux_parse_tag_audio (demux, buffer);
gst_buffer_unref (buffer);
demux->offset += demux->tag_size;
demux->state = FLV_STATE_TAG_TYPE;
goto parse;
} else {
goto beach;
}
}
case FLV_STATE_TAG_SCRIPT:
{
if (gst_adapter_available (demux->adapter) >= demux->tag_size) {
GstBuffer *buffer;
buffer = gst_adapter_take_buffer (demux->adapter, demux->tag_size);
ret = gst_flv_demux_parse_tag_script (demux, buffer);
gst_buffer_unref (buffer);
demux->offset += demux->tag_size;
demux->state = FLV_STATE_TAG_TYPE;
/* if there's a seek event we're here for the index so if we don't have it
* we seek back to the beginning */
if (demux->seek_event) {
if (demux->indexed)
demux->state = FLV_STATE_SEEK;
else
goto no_index;
}
goto parse;
} else {
goto beach;
}
}
case FLV_STATE_SEEK:
{
GstEvent *event;
ret = GST_FLOW_OK;
if (!demux->indexed) {
if (demux->offset == demux->file_size - sizeof (guint32)) {
GstBuffer *buffer =
gst_adapter_take_buffer (demux->adapter, sizeof (guint32));
GstByteReader *reader = gst_byte_reader_new_from_buffer (buffer);
guint64 seek_offset;
if (!gst_adapter_available (demux->adapter) >= sizeof (guint32)) {
/* error */
}
seek_offset =
demux->file_size - sizeof (guint32) -
gst_byte_reader_peek_uint32_be_unchecked (reader);
gst_byte_reader_free (reader);
gst_buffer_unref (buffer);
GST_INFO_OBJECT (demux,
"Seeking to beginning of last tag at %" G_GUINT64_FORMAT,
seek_offset);
demux->state = FLV_STATE_TAG_TYPE;
flv_demux_seek_to_offset (demux, seek_offset);
goto beach;
} else
goto no_index;
}
GST_OBJECT_LOCK (demux);
event = demux->seek_event;
demux->seek_event = NULL;
GST_OBJECT_UNLOCK (demux);
/* calculate and perform seek */
if (!flv_demux_handle_seek_push (demux, event))
goto seek_failed;
gst_event_unref (event);
demux->state = FLV_STATE_TAG_TYPE;
goto beach;
}
default:
GST_DEBUG_OBJECT (demux, "unexpected demuxer state");
}
beach:
if (G_UNLIKELY (ret == GST_FLOW_NOT_LINKED)) {
/* If either audio or video is linked we return GST_FLOW_OK */
if (demux->audio_linked || demux->video_linked) {
ret = GST_FLOW_OK;
}
}
gst_object_unref (demux);
return ret;
/* ERRORS */
no_index:
{
GST_OBJECT_LOCK (demux);
demux->seeking = FALSE;
gst_event_unref (demux->seek_event);
demux->seek_event = NULL;
GST_OBJECT_UNLOCK (demux);
GST_WARNING_OBJECT (demux,
"failed to find an index, seeking back to beginning");
flv_demux_seek_to_offset (demux, 0);
return GST_FLOW_OK;
}
seek_failed:
{
GST_ELEMENT_ERROR (demux, STREAM, DEMUX, (NULL), ("seek failed"));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_flv_demux_pull_range (GstFlvDemux * demux, GstPad * pad, guint64 offset,
guint size, GstBuffer ** buffer)
{
GstFlowReturn ret;
ret = gst_pad_pull_range (pad, offset, size, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
GST_WARNING_OBJECT (demux,
"failed when pulling %d bytes from offset %" G_GUINT64_FORMAT ": %s",
size, offset, gst_flow_get_name (ret));
*buffer = NULL;
return ret;
}
if (G_UNLIKELY (*buffer && GST_BUFFER_SIZE (*buffer) != size)) {
GST_WARNING_OBJECT (demux,
"partial pull got %d when expecting %d from offset %" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (*buffer), size, offset);
gst_buffer_unref (*buffer);
ret = GST_FLOW_UNEXPECTED;
*buffer = NULL;
return ret;
}
return ret;
}
static GstFlowReturn
gst_flv_demux_pull_tag (GstPad * pad, GstFlvDemux * demux)
{
GstBuffer *buffer = NULL;
GstFlowReturn ret = GST_FLOW_OK;
/* Store tag offset */
demux->cur_tag_offset = demux->offset;
/* Get the first 4 bytes to identify tag type and size */
if (G_UNLIKELY ((ret = gst_flv_demux_pull_range (demux, pad, demux->offset,
FLV_TAG_TYPE_SIZE, &buffer)) != GST_FLOW_OK))
goto beach;
/* Identify tag type */
ret = gst_flv_demux_parse_tag_type (demux, buffer);
gst_buffer_unref (buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
/* Jump over tag type + size */
demux->offset += FLV_TAG_TYPE_SIZE;
/* Pull the whole tag */
if (G_UNLIKELY ((ret = gst_flv_demux_pull_range (demux, pad, demux->offset,
demux->tag_size, &buffer)) != GST_FLOW_OK))
goto beach;
switch (demux->state) {
case FLV_STATE_TAG_VIDEO:
ret = gst_flv_demux_parse_tag_video (demux, buffer);
break;
case FLV_STATE_TAG_AUDIO:
ret = gst_flv_demux_parse_tag_audio (demux, buffer);
break;
case FLV_STATE_TAG_SCRIPT:
ret = gst_flv_demux_parse_tag_script (demux, buffer);
break;
default:
GST_WARNING_OBJECT (demux, "unexpected state %d", demux->state);
}
gst_buffer_unref (buffer);
/* Jump over that part we've just parsed */
demux->offset += demux->tag_size;
/* Make sure we reinitialize the tag size */
demux->tag_size = 0;
/* Ready for the next tag */
demux->state = FLV_STATE_TAG_TYPE;
if (G_UNLIKELY (ret == GST_FLOW_NOT_LINKED)) {
/* If either audio or video is linked we return GST_FLOW_OK */
if (demux->audio_linked || demux->video_linked) {
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux, "parsing this tag returned not-linked and "
"neither video nor audio are linked");
}
}
beach:
return ret;
}
static GstFlowReturn
gst_flv_demux_pull_header (GstPad * pad, GstFlvDemux * demux)
{
GstBuffer *buffer = NULL;
GstFlowReturn ret = GST_FLOW_OK;
/* Get the first 9 bytes */
if (G_UNLIKELY ((ret = gst_flv_demux_pull_range (demux, pad, demux->offset,
FLV_HEADER_SIZE, &buffer)) != GST_FLOW_OK))
goto beach;
ret = gst_flv_demux_parse_header (demux, buffer);
gst_buffer_unref (buffer);
/* Jump over the header now */
demux->offset += FLV_HEADER_SIZE;
demux->state = FLV_STATE_TAG_TYPE;
beach:
return ret;
}
static void
gst_flv_demux_move_to_offset (GstFlvDemux * demux, gint64 offset,
gboolean reset)
{
demux->offset = offset;
/* Tell all the stream we moved to a different position (discont) */
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
/* next section setup */
demux->from_offset = -1;
demux->audio_done = demux->video_done = FALSE;
demux->audio_first_ts = demux->video_first_ts = GST_CLOCK_TIME_NONE;
if (reset) {
demux->from_offset = -1;
demux->to_offset = G_MAXINT64;
}
/* If we seeked at the beginning of the file parse the header again */
if (G_UNLIKELY (!demux->offset)) {
demux->state = FLV_STATE_HEADER;
} else { /* or parse a tag */
demux->state = FLV_STATE_TAG_TYPE;
}
}
static GstFlowReturn
gst_flv_demux_seek_to_prev_keyframe (GstFlvDemux * demux)
{
GstFlowReturn ret = GST_FLOW_UNEXPECTED;
GstIndexEntry *entry = NULL;
GST_DEBUG_OBJECT (demux,
"terminated section started at offset %" G_GINT64_FORMAT,
demux->from_offset);
/* we are done if we got all audio and video */
if ((!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts) ||
demux->audio_first_ts < demux->segment.start) &&
(!GST_CLOCK_TIME_IS_VALID (demux->video_first_ts) ||
demux->video_first_ts < demux->segment.start))
goto done;
if (demux->from_offset <= 0)
goto done;
GST_DEBUG_OBJECT (demux, "locating previous position");
/* locate index entry before previous start position */
if (demux->index)
entry = gst_index_get_assoc_entry (demux->index, demux->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_BYTES, demux->from_offset - 1);
if (entry) {
gint64 bytes, time;
gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time);
GST_DEBUG_OBJECT (demux, "found index entry for %" G_GINT64_FORMAT
" at %" GST_TIME_FORMAT ", seeking to %" G_GINT64_FORMAT,
demux->offset - 1, GST_TIME_ARGS (time), bytes);
/* setup for next section */
demux->to_offset = demux->from_offset;
gst_flv_demux_move_to_offset (demux, bytes, FALSE);
ret = GST_FLOW_OK;
}
done:
return ret;
}
static gboolean
gst_flv_demux_push_src_event (GstFlvDemux * demux, GstEvent * event)
{
gboolean ret = TRUE;
if (demux->audio_pad)
ret |= gst_pad_push_event (demux->audio_pad, gst_event_ref (event));
if (demux->video_pad)
ret |= gst_pad_push_event (demux->video_pad, gst_event_ref (event));
gst_event_unref (event);
return ret;
}
static GstFlowReturn
gst_flv_demux_create_index (GstFlvDemux * demux, gint64 pos, GstClockTime ts)
{
gint64 size;
GstFormat fmt = GST_FORMAT_BYTES;
size_t tag_size;
guint64 old_offset;
GstBuffer *buffer;
GstClockTime tag_time;
GstFlowReturn ret = GST_FLOW_OK;
if (G_UNLIKELY (!gst_pad_query_peer_duration (demux->sinkpad, &fmt, &size) ||
fmt != GST_FORMAT_BYTES))
return GST_FLOW_OK;
GST_DEBUG_OBJECT (demux, "building index at %" G_GINT64_FORMAT
" looking for time %" GST_TIME_FORMAT, pos, GST_TIME_ARGS (ts));
old_offset = demux->offset;
demux->offset = pos;
while ((ret = gst_flv_demux_pull_range (demux, demux->sinkpad, demux->offset,
12, &buffer)) == GST_FLOW_OK) {
tag_time =
gst_flv_demux_parse_tag_timestamp (demux, TRUE, buffer, &tag_size);
gst_buffer_unref (buffer);
if (G_UNLIKELY (tag_time == GST_CLOCK_TIME_NONE || tag_time > ts))
goto exit;
demux->offset += tag_size;
}
if (ret == GST_FLOW_UNEXPECTED) {
/* file ran out, so mark we have complete index */
demux->indexed = TRUE;
ret = GST_FLOW_OK;
}
exit:
demux->offset = old_offset;
return ret;
}
static gint64
gst_flv_demux_get_metadata (GstFlvDemux * demux)
{
gint64 ret = 0, offset;
GstFormat fmt = GST_FORMAT_BYTES;
size_t tag_size, size;
GstBuffer *buffer = NULL;
if (G_UNLIKELY (!gst_pad_query_peer_duration (demux->sinkpad, &fmt, &offset)
|| fmt != GST_FORMAT_BYTES))
goto exit;
ret = offset;
GST_DEBUG_OBJECT (demux, "upstream size: %" G_GINT64_FORMAT, offset);
if (G_UNLIKELY (offset < 4))
goto exit;
offset -= 4;
if (GST_FLOW_OK != gst_flv_demux_pull_range (demux, demux->sinkpad, offset,
4, &buffer))
goto exit;
tag_size = GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer));
GST_DEBUG_OBJECT (demux, "last tag size: %" G_GSIZE_FORMAT, tag_size);
gst_buffer_unref (buffer);
buffer = NULL;
offset -= tag_size;
if (GST_FLOW_OK != gst_flv_demux_pull_range (demux, demux->sinkpad, offset,
12, &buffer))
goto exit;
/* a consistency check */
size = GST_READ_UINT24_BE (GST_BUFFER_DATA (buffer) + 1);
if (size != tag_size - 11) {
GST_DEBUG_OBJECT (demux,
"tag size %" G_GSIZE_FORMAT ", expected %" G_GSIZE_FORMAT
", corrupt or truncated file", size, tag_size - 11);
goto exit;
}
/* try to update duration with timestamp in any case */
gst_flv_demux_parse_tag_timestamp (demux, FALSE, buffer, &size);
/* maybe get some more metadata */
if (GST_BUFFER_DATA (buffer)[0] == 18) {
gst_buffer_unref (buffer);
buffer = NULL;
GST_DEBUG_OBJECT (demux, "script tag, pulling it to parse");
offset += 4;
if (GST_FLOW_OK == gst_flv_demux_pull_range (demux, demux->sinkpad, offset,
tag_size, &buffer))
gst_flv_demux_parse_tag_script (demux, buffer);
}
exit:
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
static void
gst_flv_demux_loop (GstPad * pad)
{
GstFlvDemux *demux = NULL;
GstFlowReturn ret = GST_FLOW_OK;
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
/* pull in data */
switch (demux->state) {
case FLV_STATE_TAG_TYPE:
if (demux->from_offset == -1)
demux->from_offset = demux->offset;
ret = gst_flv_demux_pull_tag (pad, demux);
/* if we have seen real data, we probably passed a possible metadata
* header located at start. So if we do not yet have an index,
* try to pick up metadata (index, duration) at the end */
if (G_UNLIKELY (!demux->file_size && !demux->indexed &&
(demux->has_video || demux->has_audio)))
demux->file_size = gst_flv_demux_get_metadata (demux);
break;
case FLV_STATE_DONE:
ret = GST_FLOW_UNEXPECTED;
break;
case FLV_STATE_SEEK:
/* seek issued with insufficient index;
* scan for index in task thread from current maximum offset to
* desired time and then perform seek */
/* TODO maybe some buffering message or so to indicate scan progress */
ret = gst_flv_demux_create_index (demux, demux->index_max_pos,
demux->seek_time);
if (ret != GST_FLOW_OK)
goto pause;
/* position and state arranged by seek,
* also unrefs event */
gst_flv_demux_handle_seek_pull (demux, demux->seek_event, FALSE);
demux->seek_event = NULL;
break;
default:
ret = gst_flv_demux_pull_header (pad, demux);
/* index scans start after header */
demux->index_max_pos = demux->offset;
break;
}
if (demux->segment.rate < 0.0) {
/* check end of section */
if ((gint64) demux->offset >= demux->to_offset ||
demux->segment.last_stop >= demux->segment.stop + 2 * GST_SECOND ||
(demux->audio_done && demux->video_done))
ret = gst_flv_demux_seek_to_prev_keyframe (demux);
} else {
/* check EOS condition */
if ((demux->segment.stop != -1) &&
(demux->segment.last_stop >= demux->segment.stop)) {
ret = GST_FLOW_UNEXPECTED;
}
}
/* pause if something went wrong or at end */
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
gst_object_unref (demux);
return;
pause:
{
const gchar *reason = gst_flow_get_name (ret);
GST_LOG_OBJECT (demux, "pausing task, reason %s", reason);
gst_pad_pause_task (pad);
if (ret == GST_FLOW_UNEXPECTED) {
/* perform EOS logic */
if (!demux->no_more_pads) {
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
demux->no_more_pads = TRUE;
}
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gint64 stop;
/* for segment playback we need to post when (in stream time)
* we stopped, this is either stop (when set) or the duration. */
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
if (demux->segment.rate >= 0) {
GST_LOG_OBJECT (demux, "Sending segment done, at end of segment");
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_done (GST_OBJECT_CAST (demux),
GST_FORMAT_TIME, stop));
} else { /* Reverse playback */
GST_LOG_OBJECT (demux, "Sending segment done, at beginning of "
"segment");
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_done (GST_OBJECT_CAST (demux),
GST_FORMAT_TIME, demux->segment.start));
}
} else {
/* normal playback, send EOS to all linked pads */
if (!demux->no_more_pads) {
gst_element_no_more_pads (GST_ELEMENT (demux));
demux->no_more_pads = TRUE;
}
GST_LOG_OBJECT (demux, "Sending EOS, at end of stream");
if (!gst_flv_demux_push_src_event (demux, gst_event_new_eos ()))
GST_WARNING_OBJECT (demux, "failed pushing EOS on streams");
}
} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
GST_ELEMENT_ERROR (demux, STREAM, FAILED,
("Internal data stream error."),
("stream stopped, reason %s", reason));
gst_flv_demux_push_src_event (demux, gst_event_new_eos ());
}
gst_object_unref (demux);
return;
}
}
static guint64
gst_flv_demux_find_offset (GstFlvDemux * demux, GstSegment * segment)
{
gint64 bytes = 0;
gint64 time = 0;
GstIndexEntry *entry;
g_return_val_if_fail (segment != NULL, 0);
time = segment->last_stop;
if (demux->index) {
/* Let's check if we have an index entry for that seek time */
entry = gst_index_get_assoc_entry (demux->index, demux->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_TIME, time);
if (entry) {
gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time);
GST_DEBUG_OBJECT (demux, "found index entry for %" GST_TIME_FORMAT
" at %" GST_TIME_FORMAT ", seeking to %" G_GINT64_FORMAT,
GST_TIME_ARGS (segment->last_stop), GST_TIME_ARGS (time), bytes);
/* Key frame seeking */
if (segment->flags & GST_SEEK_FLAG_KEY_UNIT) {
/* Adjust the segment so that the keyframe fits in */
if (time < segment->start) {
segment->start = segment->time = time;
}
segment->last_stop = time;
}
} else {
GST_DEBUG_OBJECT (demux, "no index entry found for %" GST_TIME_FORMAT,
GST_TIME_ARGS (segment->start));
}
}
return bytes;
}
static gboolean
flv_demux_handle_seek_push (GstFlvDemux * demux, GstEvent * event)
{
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gdouble rate;
gboolean update, flush, ret;
GstSegment seeksegment;
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
if (format != GST_FORMAT_TIME)
goto wrong_format;
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
/* FIXME : the keyframe flag is never used ! */
/* Work on a copy until we are sure the seek succeeded. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
GST_DEBUG_OBJECT (demux, "segment before configure %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Apply the seek to our segment */
gst_segment_set_seek (&seeksegment, rate, format, flags,
start_type, start, stop_type, stop, &update);
GST_DEBUG_OBJECT (demux, "segment configured %" GST_SEGMENT_FORMAT,
&seeksegment);
if (flush || seeksegment.last_stop != demux->segment.last_stop) {
/* Do the actual seeking */
guint64 offset = gst_flv_demux_find_offset (demux, &seeksegment);
GST_DEBUG_OBJECT (demux, "generating an upstream seek at position %"
G_GUINT64_FORMAT, offset);
ret = gst_pad_push_event (demux->sinkpad,
gst_event_new_seek (seeksegment.rate, GST_FORMAT_BYTES,
seeksegment.flags | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET,
offset, GST_SEEK_TYPE_NONE, 0));
if (G_UNLIKELY (!ret)) {
GST_WARNING_OBJECT (demux, "upstream seek failed");
}
/* Tell all the stream we moved to a different position (discont) */
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
} else {
ret = TRUE;
}
if (ret) {
/* Ok seek succeeded, take the newly configured segment */
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
/* Tell all the stream a new segment is needed */
demux->audio_need_segment = TRUE;
demux->video_need_segment = TRUE;
/* Clean any potential newsegment event kept for the streams. The first
* stream needing a new segment will create a new one. */
if (G_UNLIKELY (demux->new_seg_event)) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
gst_event_unref (event);
} else {
ret = gst_pad_push_event (demux->sinkpad, event);
}
return ret;
/* ERRORS */
wrong_format:
{
GST_WARNING_OBJECT (demux, "we only support seeking in TIME format");
gst_event_unref (event);
return FALSE;
}
}
static gboolean
gst_flv_demux_handle_seek_push (GstFlvDemux * demux, GstEvent * event)
{
GstFormat format;
gst_event_parse_seek (event, NULL, &format, NULL, NULL, NULL, NULL, NULL);
if (format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (demux, "we only support seeking in TIME format");
gst_event_unref (event);
return FALSE;
}
/* First try upstream */
if (gst_pad_push_event (demux->sinkpad, gst_event_ref (event))) {
GST_DEBUG_OBJECT (demux, "Upstream successfully seeked");
gst_event_unref (event);
return TRUE;
}
if (!demux->indexed) {
guint64 seek_offset = 0;
gboolean building_index;
GstFormat fmt;
GST_OBJECT_LOCK (demux);
/* handle the seek in the chain function */
demux->seeking = TRUE;
demux->state = FLV_STATE_SEEK;
/* copy the event */
if (demux->seek_event)
gst_event_unref (demux->seek_event);
demux->seek_event = gst_event_ref (event);
/* set the building_index flag so that only one thread can setup the
* structures for index seeking. */
building_index = demux->building_index;
if (!building_index) {
demux->building_index = TRUE;
fmt = GST_FORMAT_BYTES;
if (!demux->file_size
&& !gst_pad_query_peer_duration (demux->sinkpad, &fmt,
&demux->file_size)) {
GST_WARNING_OBJECT (demux,
"Cannot obtain file size - %" G_GINT64_FORMAT ", format %u",
demux->file_size, fmt);
GST_OBJECT_UNLOCK (demux);
return FALSE;
}
/* we hope the last tag is a scriptdataobject containing an index
* the size of the last tag is given in the last guint32 bits
* then we seek to the beginning of the tag, parse it and hopefully obtain an index */
seek_offset = demux->file_size - sizeof (guint32);
GST_DEBUG_OBJECT (demux,
"File size obtained, seeking to %" G_GUINT64_FORMAT, seek_offset);
}
GST_OBJECT_UNLOCK (demux);
if (!building_index) {
GST_INFO_OBJECT (demux, "Seeking to last 4 bytes at %" G_GUINT64_FORMAT,
seek_offset);
return flv_demux_seek_to_offset (demux, seek_offset);
}
/* FIXME: we have to always return true so that we don't block the seek
* thread.
* Note: maybe it is OK to return true if we're still building the index */
return TRUE;
}
return flv_demux_handle_seek_push (demux, event);
}
static gboolean
gst_flv_demux_handle_seek_pull (GstFlvDemux * demux, GstEvent * event,
gboolean seeking)
{
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gdouble rate;
gboolean update, flush, ret = FALSE;
GstSegment seeksegment;
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
if (format != GST_FORMAT_TIME)
goto wrong_format;
/* mark seeking thread entering flushing/pausing */
GST_OBJECT_LOCK (demux);
if (seeking)
demux->seeking = seeking;
GST_OBJECT_UNLOCK (demux);
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
/* FIXME : the keyframe flag is never used */
if (flush) {
/* Flush start up and downstream to make sure data flow and loops are
idle */
gst_flv_demux_push_src_event (demux, gst_event_new_flush_start ());
gst_pad_push_event (demux->sinkpad, gst_event_new_flush_start ());
} else {
/* Pause the pulling task */
gst_pad_pause_task (demux->sinkpad);
}
/* Take the stream lock */
GST_PAD_STREAM_LOCK (demux->sinkpad);
if (flush) {
/* Stop flushing upstream we need to pull */
gst_pad_push_event (demux->sinkpad, gst_event_new_flush_stop ());
}
/* Work on a copy until we are sure the seek succeeded. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
GST_DEBUG_OBJECT (demux, "segment before configure %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Apply the seek to our segment */
gst_segment_set_seek (&seeksegment, rate, format, flags,
start_type, start, stop_type, stop, &update);
GST_DEBUG_OBJECT (demux, "segment configured %" GST_SEGMENT_FORMAT,
&seeksegment);
if (flush || seeksegment.last_stop != demux->segment.last_stop) {
/* Do the actual seeking */
/* index is reliable if it is complete or we do not go to far ahead */
if (seeking && !demux->indexed &&
seeksegment.last_stop > demux->index_max_time + 10 * GST_SECOND) {
GST_DEBUG_OBJECT (demux, "delaying seek to post-scan; "
" index only up to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->index_max_time));
/* stop flushing for now */
if (flush)
gst_flv_demux_push_src_event (demux, gst_event_new_flush_stop ());
/* delegate scanning and index building to task thread to avoid
* occupying main (UI) loop */
if (demux->seek_event)
gst_event_unref (demux->seek_event);
demux->seek_event = gst_event_ref (event);
demux->seek_time = seeksegment.last_stop;
demux->state = FLV_STATE_SEEK;
/* do not know about succes yet, but we did care and handled it */
ret = TRUE;
goto exit;
}
/* now index should be as reliable as it can be for current purpose */
gst_flv_demux_move_to_offset (demux,
gst_flv_demux_find_offset (demux, &seeksegment), TRUE);
ret = TRUE;
} else {
ret = TRUE;
}
if (G_UNLIKELY (demux->close_seg_event)) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
if (flush) {
/* Stop flushing, the sinks are at time 0 now */
gst_flv_demux_push_src_event (demux, gst_event_new_flush_stop ());
} else {
GST_DEBUG_OBJECT (demux, "closing running segment %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Close the current segment for a linear playback */
if (demux->segment.rate >= 0) {
/* for forward playback, we played from start to last_stop */
demux->close_seg_event = gst_event_new_new_segment (TRUE,
demux->segment.rate, demux->segment.format,
demux->segment.start, demux->segment.last_stop, demux->segment.time);
} else {
gint64 stop;
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
/* for reverse playback, we played from stop to last_stop. */
demux->close_seg_event = gst_event_new_new_segment (TRUE,
demux->segment.rate, demux->segment.format,
demux->segment.last_stop, stop, demux->segment.last_stop);
}
}
if (ret) {
/* Ok seek succeeded, take the newly configured segment */
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
/* Notify about the start of a new segment */
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_segment_start (GST_OBJECT (demux),
demux->segment.format, demux->segment.last_stop));
}
/* Tell all the stream a new segment is needed */
demux->audio_need_segment = TRUE;
demux->video_need_segment = TRUE;
/* Clean any potential newsegment event kept for the streams. The first
* stream needing a new segment will create a new one. */
if (G_UNLIKELY (demux->new_seg_event)) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->segment.rate < 0.0) {
/* we can't generate a segment by locking on
* to the first timestamp we see */
GST_DEBUG_OBJECT (demux, "preparing newsegment from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.start),
GST_TIME_ARGS (demux->segment.stop));
demux->new_seg_event =
gst_event_new_new_segment (FALSE, demux->segment.rate,
demux->segment.format, demux->segment.start,
demux->segment.stop, demux->segment.start);
}
}
exit:
GST_OBJECT_LOCK (demux);
seeking = demux->seeking && !seeking;
demux->seeking = FALSE;
GST_OBJECT_UNLOCK (demux);
/* if we detect an external seek having started (and possibly already having
* flushed), do not restart task to give it a chance.
* Otherwise external one's flushing will take care to pause task */
if (seeking) {
gst_pad_pause_task (demux->sinkpad);
} else {
gst_pad_start_task (demux->sinkpad,
(GstTaskFunction) gst_flv_demux_loop, demux->sinkpad);
}
GST_PAD_STREAM_UNLOCK (demux->sinkpad);
gst_event_unref (event);
return ret;
/* ERRORS */
wrong_format:
{
GST_WARNING_OBJECT (demux, "we only support seeking in TIME format");
gst_event_unref (event);
return ret;
}
}
/* If we can pull that's prefered */
static gboolean
gst_flv_demux_sink_activate (GstPad * sinkpad)
{
if (gst_pad_check_pull_range (sinkpad)) {
return gst_pad_activate_pull (sinkpad, TRUE);
} else {
return gst_pad_activate_push (sinkpad, TRUE);
}
}
/* This function gets called when we activate ourselves in push mode.
* We cannot seek (ourselves) in the stream */
static gboolean
gst_flv_demux_sink_activate_push (GstPad * sinkpad, gboolean active)
{
GstFlvDemux *demux;
demux = GST_FLV_DEMUX (gst_pad_get_parent (sinkpad));
demux->random_access = FALSE;
gst_object_unref (demux);
return TRUE;
}
/* this function gets called when we activate ourselves in pull mode.
* We can perform random access to the resource and we start a task
* to start reading */
static gboolean
gst_flv_demux_sink_activate_pull (GstPad * sinkpad, gboolean active)
{
GstFlvDemux *demux;
demux = GST_FLV_DEMUX (gst_pad_get_parent (sinkpad));
if (active) {
demux->random_access = TRUE;
gst_object_unref (demux);
return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_flv_demux_loop,
sinkpad);
} else {
demux->random_access = FALSE;
gst_object_unref (demux);
return gst_pad_stop_task (sinkpad);
}
}
static gboolean
gst_flv_demux_sink_event (GstPad * pad, GstEvent * event)
{
GstFlvDemux *demux;
gboolean ret = FALSE;
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (demux, "handling event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (demux, "trying to force chain function to exit");
demux->flushing = TRUE;
ret = gst_flv_demux_push_src_event (demux, event);
break;
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (demux, "flushing FLV demuxer");
gst_flv_demux_flush (demux, TRUE);
ret = gst_flv_demux_push_src_event (demux, event);
break;
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (demux, "received EOS");
if (demux->index) {
GST_DEBUG_OBJECT (demux, "committing index");
gst_index_commit (demux->index, demux->index_id);
}
if (!demux->no_more_pads) {
gst_element_no_more_pads (GST_ELEMENT (demux));
demux->no_more_pads = TRUE;
}
if (!gst_flv_demux_push_src_event (demux, event))
GST_WARNING_OBJECT (demux, "failed pushing EOS on streams");
ret = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate;
gint64 start, stop, time;
gboolean update;
GST_DEBUG_OBJECT (demux, "received new segment");
gst_event_parse_new_segment (event, &update, &rate, &format, &start,
&stop, &time);
if (format == GST_FORMAT_TIME) {
/* time segment, this is perfect, copy over the values. */
gst_segment_set_newsegment (&demux->segment, update, rate, format,
start, stop, time);
GST_DEBUG_OBJECT (demux, "NEWSEGMENT: %" GST_SEGMENT_FORMAT,
&demux->segment);
/* and forward */
ret = gst_flv_demux_push_src_event (demux, event);
} else {
/* non-time format */
demux->audio_need_segment = TRUE;
demux->video_need_segment = TRUE;
ret = TRUE;
gst_event_unref (event);
}
break;
}
default:
ret = gst_flv_demux_push_src_event (demux, event);
break;
}
gst_object_unref (demux);
return ret;
}
static gboolean
gst_flv_demux_src_event (GstPad * pad, GstEvent * event)
{
GstFlvDemux *demux;
gboolean ret = FALSE;
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (demux, "handling event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (demux->random_access) {
ret = gst_flv_demux_handle_seek_pull (demux, event, TRUE);
} else {
ret = gst_flv_demux_handle_seek_push (demux, event);
}
break;
default:
ret = gst_pad_push_event (demux->sinkpad, event);
break;
}
gst_object_unref (demux);
return ret;
}
static gboolean
gst_flv_demux_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstFlvDemux *demux;
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:
{
GstFormat format;
gst_query_parse_duration (query, &format, NULL);
/* duration is time only */
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (demux, "duration query only supported for time "
"format");
res = FALSE;
goto beach;
}
GST_DEBUG_OBJECT (pad, "duration query, replying %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->duration));
gst_query_set_duration (query, GST_FORMAT_TIME, demux->duration);
break;
}
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
/* position is time only */
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (demux, "position query only supported for time "
"format");
res = FALSE;
goto beach;
}
GST_DEBUG_OBJECT (pad, "position query, replying %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.last_stop));
gst_query_set_position (query, GST_FORMAT_TIME, demux->segment.last_stop);
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
/* First ask upstream */
if (fmt == GST_FORMAT_TIME && gst_pad_peer_query (demux->sinkpad, query)) {
gboolean seekable;
gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL);
if (seekable) {
res = TRUE;
break;
}
}
res = TRUE;
if (fmt != GST_FORMAT_TIME || !demux->index) {
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
} else if (demux->random_access) {
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0,
demux->duration);
} else {
GstQuery *peerquery = gst_query_new_seeking (GST_FORMAT_BYTES);
gboolean seekable = gst_pad_peer_query (demux->sinkpad, peerquery);
if (seekable)
gst_query_parse_seeking (peerquery, NULL, &seekable, NULL, NULL);
gst_query_unref (peerquery);
if (seekable)
gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0,
demux->duration);
else
gst_query_set_seeking (query, GST_FORMAT_TIME, FALSE, -1, -1);
}
break;
}
case GST_QUERY_LATENCY:
default:
{
GstPad *peer;
if ((peer = gst_pad_get_peer (demux->sinkpad))) {
/* query latency on peer pad */
res = gst_pad_query (peer, query);
gst_object_unref (peer);
} else {
/* no peer, we don't know */
res = FALSE;
}
break;
}
}
beach:
gst_object_unref (demux);
return res;
}
static GstStateChangeReturn
gst_flv_demux_change_state (GstElement * element, GstStateChange transition)
{
GstFlvDemux *demux;
GstStateChangeReturn ret;
demux = GST_FLV_DEMUX (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* If this is our own index destroy it as the
* old entries might be wrong for the new stream */
if (demux->own_index) {
gst_object_unref (demux->index);
demux->index = NULL;
demux->own_index = FALSE;
}
/* If no index was created, generate one */
if (G_UNLIKELY (!demux->index)) {
GST_DEBUG_OBJECT (demux, "no index provided creating our own");
demux->index = gst_index_factory_make ("memindex");
gst_index_get_writer_id (demux->index, GST_OBJECT (demux),
&demux->index_id);
demux->own_index = TRUE;
}
gst_flv_demux_cleanup (demux);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_flv_demux_cleanup (demux);
break;
default:
break;
}
return ret;
}
static void
gst_flv_demux_set_index (GstElement * element, GstIndex * index)
{
GstFlvDemux *demux = GST_FLV_DEMUX (element);
GST_OBJECT_LOCK (demux);
if (demux->index)
gst_object_unref (demux->index);
if (index) {
demux->index = gst_object_ref (index);
demux->own_index = FALSE;
} else
demux->index = NULL;
GST_OBJECT_UNLOCK (demux);
/* object lock might be taken again */
if (index)
gst_index_get_writer_id (index, GST_OBJECT (element), &demux->index_id);
GST_DEBUG_OBJECT (demux, "Set index %" GST_PTR_FORMAT, demux->index);
}
static GstIndex *
gst_flv_demux_get_index (GstElement * element)
{
GstIndex *result = NULL;
GstFlvDemux *demux = GST_FLV_DEMUX (element);
GST_OBJECT_LOCK (demux);
if (demux->index)
result = gst_object_ref (demux->index);
GST_OBJECT_UNLOCK (demux);
return result;
}
static void
gst_flv_demux_dispose (GObject * object)
{
GstFlvDemux *demux = GST_FLV_DEMUX (object);
GST_DEBUG_OBJECT (demux, "disposing FLV demuxer");
if (demux->adapter) {
gst_adapter_clear (demux->adapter);
g_object_unref (demux->adapter);
demux->adapter = NULL;
}
if (demux->taglist) {
gst_tag_list_free (demux->taglist);
demux->taglist = NULL;
}
if (demux->new_seg_event) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->close_seg_event) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
if (demux->audio_codec_data) {
gst_buffer_unref (demux->audio_codec_data);
demux->audio_codec_data = NULL;
}
if (demux->video_codec_data) {
gst_buffer_unref (demux->video_codec_data);
demux->video_codec_data = NULL;
}
if (demux->audio_pad) {
gst_object_unref (demux->audio_pad);
demux->audio_pad = NULL;
}
if (demux->video_pad) {
gst_object_unref (demux->video_pad);
demux->video_pad = NULL;
}
if (demux->index) {
gst_object_unref (demux->index);
demux->index = NULL;
}
if (demux->times) {
g_array_free (demux->times, TRUE);
demux->times = NULL;
}
if (demux->filepositions) {
g_array_free (demux->filepositions, TRUE);
demux->filepositions = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_flv_demux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_static_pad_template (element_class,
&flv_sink_template);
gst_element_class_add_static_pad_template (element_class,
&audio_src_template);
gst_element_class_add_static_pad_template (element_class,
&video_src_template);
gst_element_class_set_details_simple (element_class, "FLV Demuxer",
"Codec/Demuxer",
"Demux FLV feeds into digital streams",
"Julien Moutte <julien@moutte.net>");
}
static void
gst_flv_demux_class_init (GstFlvDemuxClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = gst_flv_demux_dispose;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_flv_demux_change_state);
gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_flv_demux_set_index);
gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_flv_demux_get_index);
}
static void
gst_flv_demux_init (GstFlvDemux * demux, GstFlvDemuxClass * g_class)
{
demux->sinkpad =
gst_pad_new_from_static_template (&flv_sink_template, "sink");
gst_pad_set_event_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_flv_demux_sink_event));
gst_pad_set_chain_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_flv_demux_chain));
gst_pad_set_activate_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_flv_demux_sink_activate));
gst_pad_set_activatepull_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_flv_demux_sink_activate_pull));
gst_pad_set_activatepush_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_flv_demux_sink_activate_push));
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
demux->adapter = gst_adapter_new ();
demux->taglist = gst_tag_list_new ();
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->own_index = FALSE;
gst_flv_demux_cleanup (demux);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (flvdemux_debug, "flvdemux", 0, "FLV demuxer");
if (!gst_element_register (plugin, "flvdemux", GST_RANK_PRIMARY,
gst_flv_demux_get_type ()) ||
!gst_element_register (plugin, "flvmux", GST_RANK_PRIMARY,
gst_flv_mux_get_type ()))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR,
"flv", "FLV muxing and demuxing plugin",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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