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gstreamer/gst/flv/gstflvparse.c
Tim-Philipp Müller 8c46cce875 flvdemux: minor micro-optimisation 
We know these values don't change during the loop, but the compiler
doesn't and has to re-check them for every iteration.
2010-02-19 12:13:08 +00:00

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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.
*/
#include "gstflvparse.h"
#include <gst/base/gstbytereader.h>
#include <string.h>
GST_DEBUG_CATEGORY_EXTERN (flvdemux_debug);
#define GST_CAT_DEFAULT flvdemux_debug
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
parse_flv_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_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 {
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_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_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_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;
}
GstFlowReturn
gst_flv_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) {
guint32 nb_elems = 0;
gboolean end_marker = FALSE;
GST_DEBUG_OBJECT (demux, "we have a metadata script object");
/* Next type must be a ECMA array */
if (!gst_byte_reader_get_uint8 (&reader, &type) || type != 8) {
g_free (function_name);
return GST_FLOW_OK;
}
if (!gst_byte_reader_get_uint32_be (&reader, &nb_elems)) {
g_free (function_name);
return GST_FLOW_OK;
}
GST_DEBUG_OBJECT (demux, "there are approx. %d elements in the array",
nb_elems);
while (nb_elems-- && !end_marker) {
gboolean ok = gst_flv_parse_metadata_item (demux, &reader, &end_marker);
if (G_UNLIKELY (!ok)) {
GST_WARNING_OBJECT (demux, "failed reading a tag, skipping");
break;
}
}
demux->push_tags = TRUE;
}
g_free (function_name);
if (demux->index && demux->times && demux->filepositions
&& !demux->random_access) {
guint num;
/* If an index was found and we're in push mode, insert associations */
num = MIN (demux->times->len, demux->filepositions->len);
for (i = 0; i < num; i++) {
GstIndexAssociation associations[2];
guint64 time, fileposition;
time = g_array_index (demux->times, gdouble, i) * GST_SECOND;
fileposition = g_array_index (demux->filepositions, gdouble, i);
GST_LOG_OBJECT (demux, "adding association %" GST_TIME_FORMAT "-> %"
G_GUINT64_FORMAT, GST_TIME_ARGS (time), fileposition);
associations[0].format = GST_FORMAT_TIME;
associations[0].value = time;
associations[1].format = GST_FORMAT_BYTES;
associations[1].value = fileposition;
gst_index_add_associationv (demux->index, demux->index_id,
GST_ASSOCIATION_FLAG_KEY_UNIT, 2, associations);
}
demux->indexed = TRUE;
}
}
return ret;
}
static gboolean
gst_flv_parse_audio_negotiate (GstFLVDemux * demux, guint32 codec_tag,
guint32 rate, guint32 channels, guint32 width)
{
GstCaps *caps = NULL;
gchar *codec_name = NULL;
gboolean ret = FALSE;
switch (codec_tag) {
case 1:
caps = gst_caps_new_simple ("audio/x-adpcm", "layout", G_TYPE_STRING,
"swf", NULL);
codec_name = "Shockwave ADPCM";
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);
codec_name = "MPEG 1 Audio, Layer 3 (MP3)";
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);
codec_name = "Raw Audio";
break;
case 4:
case 5:
case 6:
caps = gst_caps_new_simple ("audio/x-nellymoser", NULL);
codec_name = "Nellymoser ASAO";
break;
case 10:
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 4, "framed", G_TYPE_BOOLEAN, TRUE, NULL);
codec_name = "AAC";
break;
case 7:
caps = gst_caps_new_simple ("audio/x-alaw", NULL);
codec_name = "A-Law";
break;
case 8:
caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
codec_name = "Mu-Law";
break;
case 11:
caps = gst_caps_new_simple ("audio/x-speex", NULL);
codec_name = "Speex";
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, 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 have set */
demux->audio_codec_tag = codec_tag;
demux->rate = rate;
demux->channels = channels;
demux->width = width;
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);
}
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;
}
GstFlowReturn
gst_flv_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);
GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X", data[0], data[1],
data[2], data[3]);
/* 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;
/* 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_parse_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;
}
}
/* 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_parse_audio_negotiate (demux, codec_tag, rate, channels,
width)) {
ret = GST_FLOW_ERROR;
goto beach;
}
}
/* Push taglist if present */
if ((demux->has_audio && !demux->audio_pad) &&
(demux->has_video && !demux->video_pad)) {
GST_DEBUG_OBJECT (demux, "we are still waiting for a stream to come up "
"before we can push tags");
} else {
if (demux->taglist && demux->push_tags) {
GST_DEBUG_OBJECT (demux, "pushing tags out");
gst_element_found_tags (GST_ELEMENT (demux), demux->taglist);
demux->taglist = gst_tag_list_new ();
demux->push_tags = FALSE;
}
}
/* 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:
{
/* AudioSpecificConfic 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_parse_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);
}
}
/* Fill buffer with data */
GST_BUFFER_TIMESTAMP (outbuf) = pts * GST_MSECOND;
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, if we don't have
* random access and if the index is not yet complete */
if (!demux->has_video && demux->index && !demux->random_access
&& !demux->indexed) {
GST_LOG_OBJECT (demux,
"adding association %" GST_TIME_FORMAT "-> %" G_GUINT64_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)), demux->cur_tag_offset);
gst_index_add_association (demux->index, demux->index_id,
GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (outbuf), GST_FORMAT_BYTES, demux->cur_tag_offset,
NULL);
}
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 (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;
}
/* Push downstream */
ret = gst_pad_push (demux->audio_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
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_parse_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);
codec_name = "Sorenson Video";
break;
case 3:
caps = gst_caps_new_simple ("video/x-flash-screen", NULL);
codec_name = "Flash Screen Video";
break;
case 4:
caps = gst_caps_new_simple ("video/x-vp6-flash", NULL);
codec_name = "On2 VP6 Video";
break;
case 5:
caps = gst_caps_new_simple ("video/x-vp6-alpha", NULL);
codec_name = "On2 VP6 Video with alpha channel";
break;
case 7:
caps = gst_caps_new_simple ("video/x-h264", NULL);
codec_name = "H.264/AVC Video";
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 (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;
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);
}
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;
}
GstFlowReturn
gst_flv_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");
GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X", data[0], data[1],
data[2], data[3]);
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;
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) {
codec_data = 5;
}
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_parse_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;
}
}
/* 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_parse_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 ((demux->has_audio && !demux->audio_pad) &&
(demux->has_video && !demux->video_pad)) {
GST_DEBUG_OBJECT (demux, "we are still waiting for a stream to come up "
"before we can push tags");
} else {
if (demux->taglist && demux->push_tags) {
GST_DEBUG_OBJECT (demux, "pushing tags out");
gst_element_found_tags (GST_ELEMENT (demux), demux->taglist);
demux->taglist = gst_tag_list_new ();
demux->push_tags = FALSE;
}
}
/* 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_parse_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);
}
}
/* Fill buffer with data */
GST_BUFFER_TIMESTAMP (outbuf) = pts * GST_MSECOND;
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 (!demux->indexed) {
if (!keyframe) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
if (demux->index && !demux->random_access) {
GST_LOG_OBJECT (demux, "adding association %" GST_TIME_FORMAT "-> %"
G_GUINT64_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
demux->cur_tag_offset);
gst_index_add_association (demux->index, demux->index_id,
GST_ASSOCIATION_FLAG_NONE,
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf),
GST_FORMAT_BYTES, demux->cur_tag_offset, NULL);
}
} else {
if (demux->index && !demux->random_access) {
GST_LOG_OBJECT (demux, "adding association %" GST_TIME_FORMAT "-> %"
G_GUINT64_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
demux->cur_tag_offset);
gst_index_add_association (demux->index, demux->index_id,
GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf),
GST_FORMAT_BYTES, demux->cur_tag_offset, NULL);
}
}
}
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 (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;
}
/* Push downstream */
ret = gst_pad_push (demux->video_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
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;
}
GstClockTime
gst_flv_parse_tag_timestamp (GstFLVDemux * demux, 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;
if (demux->index && !demux->indexed && (type == 9 || (type == 8
&& !demux->has_video))) {
GstIndexAssociation associations[2];
GST_LOG_OBJECT (demux,
"adding association %" GST_TIME_FORMAT "-> %" G_GUINT64_FORMAT,
GST_TIME_ARGS (ret), demux->offset);
associations[0].format = GST_FORMAT_TIME;
associations[0].value = ret;
associations[1].format = GST_FORMAT_BYTES;
associations[1].value = demux->offset;
gst_index_add_associationv (demux->index, demux->index_id,
(keyframe) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_NONE,
2, associations);
}
if (demux->duration == GST_CLOCK_TIME_NONE || demux->duration < ret)
demux->duration = ret;
return ret;
}
GstFlowReturn
gst_flv_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;
}
GstFlowReturn
gst_flv_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;
}
}
/* We don't care about the rest */
demux->need_header = FALSE;
beach:
return ret;
}
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