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gstreamer/gst/avi/gstavidemux.c
Ronald S. Bultje a4bf155817 gst/avi/gstavidemux.c: Work for truncated (unfinished download etc.) files. Fixes #160514. 
Original commit message from CVS:
* gst/avi/gstavidemux.c: (gst_avi_demux_stream_index):
Work for truncated (unfinished download etc.) files. Fixes #160514.
2004-12-18 19:36:59 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@temple-baptist.com>
*
* 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.
*/
/* Element-Checklist-Version: 5 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gst/riff/riff-media.h"
#include "gstavidemux.h"
#include "avi-ids.h"
GST_DEBUG_CATEGORY_STATIC (avidemux_debug);
#define GST_CAT_DEFAULT avidemux_debug
static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-msvideo")
);
static void gst_avi_demux_base_init (GstAviDemuxClass * klass);
static void gst_avi_demux_class_init (GstAviDemuxClass * klass);
static void gst_avi_demux_init (GstAviDemux * avi);
static void gst_avi_demux_reset (GstAviDemux * avi);
static void gst_avi_demux_loop (GstElement * element);
static gboolean gst_avi_demux_send_event (GstElement * element,
GstEvent * event);
static const GstEventMask *gst_avi_demux_get_event_mask (GstPad * pad);
static gboolean gst_avi_demux_handle_src_event (GstPad * pad, GstEvent * event);
static const GstFormat *gst_avi_demux_get_src_formats (GstPad * pad);
static const GstQueryType *gst_avi_demux_get_src_query_types (GstPad * pad);
static gboolean gst_avi_demux_handle_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value);
static gboolean gst_avi_demux_src_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static GstElementStateReturn gst_avi_demux_change_state (GstElement * element);
static GstRiffReadClass *parent_class = NULL;
GType
gst_avi_demux_get_type (void)
{
static GType avi_demux_type = 0;
if (!avi_demux_type) {
static const GTypeInfo avi_demux_info = {
sizeof (GstAviDemuxClass),
(GBaseInitFunc) gst_avi_demux_base_init,
NULL,
(GClassInitFunc) gst_avi_demux_class_init,
NULL,
NULL,
sizeof (GstAviDemux),
0,
(GInstanceInitFunc) gst_avi_demux_init,
};
avi_demux_type =
g_type_register_static (GST_TYPE_RIFF_READ,
"GstAviDemux", &avi_demux_info, 0);
}
return avi_demux_type;
}
static void
gst_avi_demux_base_init (GstAviDemuxClass * klass)
{
static GstElementDetails gst_avi_demux_details =
GST_ELEMENT_DETAILS ("Avi demuxer",
"Codec/Demuxer",
"Demultiplex an avi file into audio and video",
"Erik Walthinsen <omega@cse.ogi.edu>\n"
"Wim Taymans <wim.taymans@chello.be>\n"
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstPadTemplate *videosrctempl, *audiosrctempl;
GstCaps *audcaps, *vidcaps;
audcaps = gst_riff_create_audio_template_caps ();
audiosrctempl = gst_pad_template_new ("audio_%02d",
GST_PAD_SRC, GST_PAD_SOMETIMES, audcaps);
vidcaps = gst_riff_create_video_template_caps ();
gst_caps_append (vidcaps, gst_riff_create_iavs_template_caps ());
videosrctempl = gst_pad_template_new ("video_%02d",
GST_PAD_SRC, GST_PAD_SOMETIMES, vidcaps);
gst_element_class_add_pad_template (element_class, audiosrctempl);
gst_element_class_add_pad_template (element_class, videosrctempl);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_templ));
gst_element_class_set_details (element_class, &gst_avi_demux_details);
}
static void
gst_avi_demux_class_init (GstAviDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
GST_DEBUG_CATEGORY_INIT (avidemux_debug, "avidemux",
0, "Demuxer for AVI streams");
parent_class = g_type_class_ref (GST_TYPE_RIFF_READ);
gstelement_class->change_state = gst_avi_demux_change_state;
gstelement_class->send_event = gst_avi_demux_send_event;
}
static void
gst_avi_demux_init (GstAviDemux * avi)
{
GST_FLAG_SET (avi, GST_ELEMENT_EVENT_AWARE);
avi->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_templ),
"sink");
gst_element_add_pad (GST_ELEMENT (avi), avi->sinkpad);
GST_RIFF_READ (avi)->sinkpad = avi->sinkpad;
gst_element_set_loop_function (GST_ELEMENT (avi), gst_avi_demux_loop);
gst_avi_demux_reset (avi);
avi->index_entries = NULL;
memset (&avi->stream, 0, sizeof (avi->stream));
}
static void
gst_avi_demux_reset (GstAviDemux * avi)
{
gint i;
for (i = 0; i < avi->num_streams; i++) {
g_free (avi->stream[i].strh);
gst_element_remove_pad (GST_ELEMENT (avi), avi->stream[i].pad);
gst_caps_free (avi->stream[i].caps);
}
memset (&avi->stream, 0, sizeof (avi->stream));
avi->num_streams = 0;
avi->num_v_streams = 0;
avi->num_a_streams = 0;
avi->state = GST_AVI_DEMUX_START;
avi->level_up = 0;
if (avi->index_entries) {
g_free (avi->index_entries);
avi->index_entries = NULL;
}
avi->index_size = 0;
avi->index_offset = 0;
avi->current_entry = 0;
avi->num_frames = 0;
avi->us_per_frame = 0;
avi->seek_offset = (guint64) - 1;
}
static gst_avi_index_entry *
gst_avi_demux_index_next (GstAviDemux * avi,
gint stream_nr, gint start, guint32 flags)
{
gint i;
gst_avi_index_entry *entry = NULL;
for (i = start; i < avi->index_size; i++) {
entry = &avi->index_entries[i];
if (entry->stream_nr == stream_nr && (entry->flags & flags) == flags) {
break;
}
}
return entry;
}
static gst_avi_index_entry *
gst_avi_demux_index_entry_for_time (GstAviDemux * avi,
gint stream_nr, guint64 time, guint32 flags)
{
gst_avi_index_entry *entry = NULL, *last_entry = NULL;
gint i;
i = -1;
do {
entry = gst_avi_demux_index_next (avi, stream_nr, i + 1, flags);
if (!entry)
return NULL;
i = entry->index_nr;
if (entry->ts <= time) {
last_entry = entry;
}
} while (entry->ts <= time);
return last_entry;
}
static gst_avi_index_entry *
gst_avi_demux_index_entry_for_byte (GstAviDemux * avi,
gint stream_nr, guint64 byte, guint32 flags)
{
gst_avi_index_entry *entry = NULL, *last_entry = NULL;
gint i;
i = -1;
do {
entry = gst_avi_demux_index_next (avi, stream_nr, i + 1, flags);
if (!entry)
return NULL;
i = entry->index_nr;
if (entry->bytes_before <= byte) {
last_entry = entry;
}
} while (entry->bytes_before <= byte);
return last_entry;
}
static gst_avi_index_entry *
gst_avi_demux_index_entry_for_frame (GstAviDemux * avi,
gint stream_nr, guint32 frame, guint32 flags)
{
gst_avi_index_entry *entry = NULL, *last_entry = NULL;
gint i;
i = -1;
do {
entry = gst_avi_demux_index_next (avi, stream_nr, i + 1, flags);
if (!entry)
return NULL;
i = entry->index_nr;
if (entry->frames_before <= frame) {
last_entry = entry;
}
} while (entry->frames_before <= frame);
return last_entry;
}
static const GstFormat *
gst_avi_demux_get_src_formats (GstPad * pad)
{
avi_stream_context *stream = gst_pad_get_element_private (pad);
static const GstFormat src_a_formats[] = {
GST_FORMAT_TIME,
GST_FORMAT_BYTES,
GST_FORMAT_DEFAULT,
0
};
static const GstFormat src_v_formats[] = {
GST_FORMAT_TIME,
GST_FORMAT_DEFAULT,
0
};
return (stream->strh->type == GST_RIFF_FCC_auds ?
src_a_formats : src_v_formats);
}
static gboolean
gst_avi_demux_src_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
/*GstAviDemux *avi = GST_AVI_DEMUX (gst_pad_get_parent (pad)); */
avi_stream_context *stream = gst_pad_get_element_private (pad);
if (stream->strh->type == GST_RIFF_FCC_vids &&
(src_format == GST_FORMAT_BYTES || *dest_format == GST_FORMAT_BYTES))
return FALSE;
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = src_value * stream->bitrate / GST_SECOND;
break;
case GST_FORMAT_DEFAULT:
*dest_value = src_value * stream->strh->rate /
(stream->strh->scale * GST_SECOND);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = ((gfloat) src_value) * GST_SECOND / stream->bitrate;
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = ((((gfloat) src_value) * stream->strh->scale) /
stream->strh->rate) * GST_SECOND;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType *
gst_avi_demux_get_src_query_types (GstPad * pad)
{
static const GstQueryType src_types[] = {
GST_QUERY_TOTAL,
GST_QUERY_POSITION,
0
};
return src_types;
}
static gboolean
gst_avi_demux_handle_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value)
{
gboolean res = TRUE;
GstAviDemux *demux = GST_AVI_DEMUX (gst_pad_get_parent (pad));
/*GstAviDemux *avi = GST_AVI_DEMUX (gst_pad_get_parent (pad)); */
avi_stream_context *stream = gst_pad_get_element_private (pad);
switch (type) {
case GST_QUERY_TOTAL:
switch (*format) {
case GST_FORMAT_TIME:
*value = (((gfloat) stream->strh->scale) * stream->strh->length /
stream->strh->rate) * GST_SECOND;
break;
case GST_FORMAT_BYTES:
if (stream->strh->type == GST_RIFF_FCC_auds) {
*value = stream->total_bytes;
} else
res = FALSE;
break;
case GST_FORMAT_DEFAULT:
if (stream->strh->type == GST_RIFF_FCC_auds) {
if (!stream->strh->samplesize)
*value = stream->total_frames;
else
*value = stream->total_bytes / stream->strh->samplesize;
} else if (stream->strh->type == GST_RIFF_FCC_vids)
*value = stream->strh->length;
else
res = FALSE;
break;
default:
res = FALSE;
break;
}
break;
case GST_QUERY_POSITION:
switch (*format) {
case GST_FORMAT_TIME:
if (stream->strh->type == GST_RIFF_FCC_auds) {
if (!stream->strh->samplesize) {
*value = GST_SECOND * stream->current_frame *
stream->strh->scale / stream->strh->rate;
} else if (stream->bitrate != 0) {
*value = ((gfloat) stream->current_byte) * GST_SECOND /
stream->bitrate;
} else if (stream->total_frames != 0 && stream->total_bytes != 0) {
/* calculate timestamps based on video size */
guint64 len = demux->us_per_frame * demux->num_frames *
GST_USECOND;
if (!stream->strh->samplesize)
*value = len * stream->current_frame / stream->total_frames;
else
*value = len * stream->current_byte / stream->total_bytes;
} else {
res = FALSE;
}
} else {
if (stream->strh->rate != 0) {
*value = ((gfloat) stream->current_frame * stream->strh->scale *
GST_SECOND / stream->strh->rate);
} else {
*value = stream->current_frame * demux->us_per_frame *
GST_USECOND;
}
}
break;
case GST_FORMAT_BYTES:
*value = stream->current_byte;
break;
case GST_FORMAT_DEFAULT:
if (stream->strh->samplesize &&
stream->strh->type == GST_RIFF_FCC_auds)
*value = stream->current_byte / stream->strh->samplesize;
else
*value = stream->current_frame;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
static GstCaps *
gst_avi_demux_src_getcaps (GstPad * pad)
{
avi_stream_context *stream = gst_pad_get_element_private (pad);
return gst_caps_copy (stream->caps);
}
static gboolean
gst_avi_demux_send_event (GstElement * element, GstEvent * event)
{
const GList *pads;
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *pad = GST_PAD (pads->data);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
/* we ref the event here as we might have to try again if the event
* failed on this pad */
gst_event_ref (event);
if (gst_avi_demux_handle_src_event (pad, event)) {
gst_event_unref (event);
return TRUE;
}
}
pads = g_list_next (pads);
}
gst_event_unref (event);
return FALSE;
}
static const GstEventMask *
gst_avi_demux_get_event_mask (GstPad * pad)
{
static const GstEventMask masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_KEY_UNIT},
{0,}
};
return masks;
}
static gboolean
gst_avi_demux_handle_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstAviDemux *avi = GST_AVI_DEMUX (gst_pad_get_parent (pad));
avi_stream_context *stream;
if (!avi->index_entries)
return FALSE;
stream = gst_pad_get_element_private (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
GST_DEBUG ("seek format %d, %08x", GST_EVENT_SEEK_FORMAT (event),
stream->strh->type);
switch (GST_EVENT_SEEK_FORMAT (event)) {
case GST_FORMAT_BYTES:
case GST_FORMAT_DEFAULT:
case GST_FORMAT_TIME:{
gst_avi_index_entry *entry = NULL;
gint64 desired_offset = GST_EVENT_SEEK_OFFSET (event);
guint32 flags;
/* no seek on audio yet */
if (stream->strh->type == GST_RIFF_FCC_auds) {
res = FALSE;
goto done;
}
GST_DEBUG ("seeking to %" G_GINT64_FORMAT, desired_offset);
flags = GST_RIFF_IF_KEYFRAME;
switch (GST_EVENT_SEEK_FORMAT (event)) {
case GST_FORMAT_BYTES:
entry = gst_avi_demux_index_entry_for_byte (avi, stream->num,
desired_offset, flags);
break;
case GST_FORMAT_DEFAULT:
entry = gst_avi_demux_index_entry_for_frame (avi, stream->num,
desired_offset, flags);
break;
case GST_FORMAT_TIME:
entry = gst_avi_demux_index_entry_for_time (avi, stream->num,
desired_offset, flags);
break;
}
if (entry) {
avi->seek_offset = entry->offset + avi->index_offset;
avi->last_seek = entry->ts;
avi->seek_flush =
(GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH);
avi->seek_entry = entry->index_nr;
GST_DEBUG ("Will seek to entry %d", avi->seek_entry);
} else {
GST_DEBUG ("no index entry found for format=%d value=%"
G_GINT64_FORMAT, GST_EVENT_SEEK_FORMAT (event), desired_offset);
res = FALSE;
}
GST_LOG ("seek done\n");
break;
}
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
done:
gst_event_unref (event);
return res;
}
/*
* "Open" a RIFF file.
*/
static gboolean
gst_avi_demux_stream_init (GstAviDemux * avi)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 doctype;
if (!gst_riff_read_header (riff, &doctype))
return FALSE;
if (doctype != GST_RIFF_RIFF_AVI) {
GST_ELEMENT_ERROR (avi, STREAM, WRONG_TYPE, (NULL), (NULL));
return FALSE;
}
return TRUE;
}
/*
* Read 'avih' header.
*/
static gboolean
gst_avi_demux_stream_avih (GstAviDemux * avi,
guint32 * flags, guint32 * streams)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
GstBuffer *buf;
gst_riff_avih avih, *_avih;
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
if (tag != GST_RIFF_TAG_avih) {
g_warning ("Not a avih chunk");
gst_buffer_unref (buf);
return FALSE;
}
if (GST_BUFFER_SIZE (buf) < sizeof (gst_riff_avih)) {
g_warning ("Too small avih (%d available, %d needed)",
GST_BUFFER_SIZE (buf), (int) sizeof (gst_riff_avih));
gst_buffer_unref (buf);
return FALSE;
}
_avih = (gst_riff_avih *) GST_BUFFER_DATA (buf);
avih.us_frame = GUINT32_FROM_LE (_avih->us_frame);
avih.max_bps = GUINT32_FROM_LE (_avih->max_bps);
avih.pad_gran = GUINT32_FROM_LE (_avih->pad_gran);
avih.flags = GUINT32_FROM_LE (_avih->flags);
avih.tot_frames = GUINT32_FROM_LE (_avih->tot_frames);
avih.init_frames = GUINT32_FROM_LE (_avih->init_frames);
avih.streams = GUINT32_FROM_LE (_avih->streams);
avih.bufsize = GUINT32_FROM_LE (_avih->bufsize);
avih.width = GUINT32_FROM_LE (_avih->width);
avih.height = GUINT32_FROM_LE (_avih->height);
avih.scale = GUINT32_FROM_LE (_avih->scale);
avih.rate = GUINT32_FROM_LE (_avih->rate);
avih.start = GUINT32_FROM_LE (_avih->start);
avih.length = GUINT32_FROM_LE (_avih->length);
/* debug stuff */
GST_INFO ("avih tag found:");
GST_INFO (" us_frame %u", avih.us_frame);
GST_INFO (" max_bps %u", avih.max_bps);
GST_INFO (" pad_gran %u", avih.pad_gran);
GST_INFO (" flags 0x%08x", avih.flags);
GST_INFO (" tot_frames %u", avih.tot_frames);
GST_INFO (" init_frames %u", avih.init_frames);
GST_INFO (" streams %u", avih.streams);
GST_INFO (" bufsize %u", avih.bufsize);
GST_INFO (" width %u", avih.width);
GST_INFO (" height %u", avih.height);
GST_INFO (" scale %u", avih.scale);
GST_INFO (" rate %u", avih.rate);
GST_INFO (" start %u", avih.start);
GST_INFO (" length %u", avih.length);
avi->num_frames = avih.tot_frames;
avi->us_per_frame = avih.us_frame;
*streams = avih.streams;
*flags = avih.flags;
gst_buffer_unref (buf);
return TRUE;
}
/*
* Read superindex/subindex (openDML-2).
*/
static gboolean
gst_avi_demux_read_superindex (GstAviDemux * avi,
gint stream_nr, guint64 ** locations)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
GstBuffer *buf;
guint8 *data;
gint bpe = 16, num, i;
guint64 *indexes;
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
data = GST_BUFFER_DATA (buf);
if (tag != GST_MAKE_FOURCC ('i', 'n', 'd', 'x') &&
tag != GST_MAKE_FOURCC ('i', 'x', '0' + stream_nr / 10,
'0' + stream_nr % 10)) {
g_warning ("Not an indx/ix## chunk");
gst_buffer_unref (buf);
return FALSE;
}
/* check type of index. The opendml2 specs state that
* there should be 4 dwords per array entry. Type can be
* either frame or field (and we don't care). */
if (GST_READ_UINT16_LE (data) != 4 ||
(data[2] & 0xfe) != 0x0 || data[3] != 0x0) {
GST_WARNING ("Superindex for stream %d has unexpected "
"size_entry %d (bytes) or flags 0x%02x/0x%02x",
GST_READ_UINT16_LE (data), data[2], data[3]);
bpe = GST_READ_UINT16_LE (data) * 4;
}
num = GST_READ_UINT32_LE (&data[4]);
indexes = g_new (guint64, num + 1);
for (i = 0; i < num; i++) {
if (GST_BUFFER_SIZE (buf) < 24 + bpe * (i + 1))
break;
indexes[i] = GST_READ_UINT64_LE (&data[24 + bpe * i]);
}
indexes[i] = 0;
*locations = indexes;
gst_buffer_unref (buf);
return TRUE;
}
static gboolean
gst_avi_demux_read_subindexes (GstAviDemux * avi,
GList ** index, GList ** alloc_list)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint64 pos = gst_bytestream_tell (riff->bs),
length = gst_bytestream_length (riff->bs), baseoff;
GstEvent *event;
GList *list = NULL;
gst_avi_index_entry *entries, *entry;
guint32 tag;
GstBuffer *buf;
guint8 *data;
GstFormat format = GST_FORMAT_TIME;
gint bpe, num, x, i, n;
for (n = 0; n < avi->num_streams; n++) {
avi_stream_context *stream = &avi->stream[n];
for (i = 0; stream->indexes[i] != 0; i++) {
/* eos check again */
if (stream->indexes[i] + 8 >= length) {
GST_WARNING ("Subindex %d for stream %d doesn't exist", i, n);
continue;
}
/* seek to that point */
if (!(event = gst_riff_read_seek (riff, stream->indexes[i]))) {
g_list_free (list);
return FALSE;
}
gst_event_unref (event);
if (gst_bytestream_peek_bytes (riff->bs, &data, 8) != 8) {
g_list_free (list);
return FALSE;
}
/* eos check again */
if (GST_READ_UINT32_LE (&data[4]) + gst_bytestream_tell (riff->bs) >
length) {
GST_WARNING ("Subindex %d for stream %d lies outside file", i, n);
continue;
}
/* now read */
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
data = GST_BUFFER_DATA (buf);
if (tag != GST_MAKE_FOURCC ('i', 'x', '0' + stream->num / 10,
'0' + stream->num % 10)) {
GST_WARNING ("Not an ix## chunk (" GST_FOURCC_FORMAT ")",
GST_FOURCC_ARGS (tag));
gst_buffer_unref (buf);
continue;
}
/* We don't support index-data yet */
if (data[3] & 0x80) {
GST_ELEMENT_ERROR (avi, STREAM, NOT_IMPLEMENTED, (NULL),
("Subindex-is-data is not implemented"));
return FALSE;
}
/* check type of index. The opendml2 specs state that
* there should be 4 dwords per array entry. Type can be
* either frame or field (and we don't care). */
bpe = (data[2] & 0x01) ? 12 : 8;
if (GST_READ_UINT16_LE (data) != bpe / 4 ||
(data[2] & 0xfe) != 0x0 || data[3] != 0x1) {
GST_WARNING ("Superindex for stream %d has unexpected "
"size_entry %d (bytes) or flags 0x%02x/0x%02x",
GST_READ_UINT16_LE (data), data[2], data[3]);
bpe = GST_READ_UINT16_LE (data) * 4;
}
num = GST_READ_UINT32_LE (&data[4]);
baseoff = GST_READ_UINT64_LE (&data[12]);
entries = g_new (gst_avi_index_entry, num);
*alloc_list = g_list_append (*alloc_list, entries);
for (x = 0; x < num; x++) {
entry = &entries[x];
if (GST_BUFFER_SIZE (buf) < 24 + bpe * (x + 1))
break;
/* fill in */
entry->offset = baseoff + GST_READ_UINT32_LE (&data[24 + bpe * x]);
entry->size = GST_READ_UINT32_LE (&data[24 + bpe * x + 4]);
entry->flags = (entry->size & 0x80000000) ? 0 : GST_RIFF_IF_KEYFRAME;
entry->size &= ~0x80000000;
entry->index_nr = x;
entry->stream_nr = stream->num;
/* timestamps */
if (stream->strh->samplesize && stream->strh->type == GST_RIFF_FCC_auds) {
/* constant rate stream */
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes, &format, &entry->ts);
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes + entry->size, &format, &entry->dur);
} else {
/* VBR stream */
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames, &format, &entry->ts);
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames + 1, &format, &entry->dur);
}
entry->dur -= entry->ts;
/* stream position */
entry->bytes_before = stream->total_bytes;
stream->total_bytes += entry->size;
entry->frames_before = stream->total_frames;
stream->total_frames++;
list = g_list_prepend (list, entry);
}
GST_LOG ("Read %d index entries in subindex %d for stream %d "
"at location %" G_GUINT64_FORMAT, num, i, n, stream->indexes[i]);
gst_buffer_unref (buf);
}
g_free (stream->indexes);
stream->indexes = NULL;
}
/* seek back */
if (!(event = gst_riff_read_seek (riff, pos))) {
g_list_free (list);
return FALSE;
}
gst_event_unref (event);
*index = g_list_reverse (list);
return TRUE;
}
/*
* Add a stream.
*/
static gboolean
gst_avi_demux_add_stream (GstAviDemux * avi)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (avi);
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
gst_riff_strh *strh;
GstBuffer *extradata = NULL, *initdata = NULL;
gchar *name = NULL, *padname = NULL;
GstCaps *caps = NULL;
GstPadTemplate *templ = NULL;
GstPad *pad;
avi_stream_context *stream;
gint blockalign = 0, bitrate = 0;
guint64 *locations = NULL;
union
{
gst_riff_strf_vids *vids;
gst_riff_strf_auds *auds;
gst_riff_strf_iavs *iavs;
}
strf;
/* the stream starts with a 'strh' header */
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_strh) {
g_warning ("Invalid stream header (no strh at begin)");
goto skip_stream;
}
if (!gst_riff_read_strh (riff, &strh))
return FALSE;
/* then comes a 'strf' of that specific type */
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_strf) {
GST_ELEMENT_ERROR (avi, STREAM, DEMUX, (NULL),
("Invalid AVI header (no strf as second tag)"));
goto skip_stream;
}
switch (strh->type) {
case GST_RIFF_FCC_vids:
if (!gst_riff_read_strf_vids_with_data (riff, &strf.vids, &extradata))
return FALSE;
break;
case GST_RIFF_FCC_auds:
if (!gst_riff_read_strf_auds_with_data (riff, &strf.auds, &extradata))
return FALSE;
break;
case GST_RIFF_FCC_iavs:
if (!gst_riff_read_strf_iavs (riff, &strf.iavs))
return FALSE;
break;
default:
g_warning ("Unknown stream type " GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (strh->type));
goto skip_stream;
}
/* read other things */
while (TRUE) {
if (!(tag = gst_riff_peek_tag (riff, &avi->level_up)))
return FALSE;
else if (avi->level_up) {
avi->level_up--;
break;
}
switch (tag) {
case GST_RIFF_TAG_strd:
if (initdata)
gst_buffer_unref (initdata);
if (!gst_riff_read_data (riff, &tag, &initdata))
return FALSE;
break;
case GST_RIFF_TAG_strn:
g_free (name);
if (!gst_riff_read_ascii (riff, &tag, &name))
return FALSE;
break;
default:
if (tag == GST_MAKE_FOURCC ('i', 'n', 'd', 'x') ||
tag == GST_MAKE_FOURCC ('i', 'x', avi->num_streams / 10,
avi->num_streams % 10)) {
g_free (locations);
if (!gst_avi_demux_read_superindex (avi,
avi->num_streams, &locations))
return FALSE;
break;
}
GST_WARNING ("Unknown tag " GST_FOURCC_FORMAT " in AVI header",
GST_FOURCC_ARGS (tag));
/* fall-through */
case GST_RIFF_TAG_JUNK:
if (!gst_riff_read_skip (riff))
return FALSE;
break;
}
if (avi->level_up) {
avi->level_up--;
break;
}
}
/* create stream name + pad */
switch (strh->type) {
case GST_RIFF_FCC_vids:
{
char *codec_name = NULL;
GstTagList *list = gst_tag_list_new ();
guint32 tag;
padname = g_strdup_printf ("video_%02d", avi->num_v_streams);
templ = gst_element_class_get_pad_template (klass, "video_%02d");
if (strf.vids->compression)
tag = strf.vids->compression;
else
tag = strh->fcc_handler;
caps = gst_riff_create_video_caps_with_data (tag,
strh, strf.vids, extradata, initdata, &codec_name);
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_VIDEO_CODEC,
codec_name, NULL);
gst_element_found_tags (GST_ELEMENT (avi), list);
gst_tag_list_free (list);
if (codec_name)
g_free (codec_name);
g_free (strf.vids);
avi->num_v_streams++;
break;
}
case GST_RIFF_FCC_auds:
{
char *codec_name = NULL;
GstTagList *list = gst_tag_list_new ();
padname = g_strdup_printf ("audio_%02d", avi->num_a_streams);
templ = gst_element_class_get_pad_template (klass, "audio_%02d");
caps =
gst_riff_create_audio_caps_with_data (strf.auds->format, strh,
strf.auds, extradata, initdata, &codec_name);
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_AUDIO_CODEC,
codec_name, NULL);
gst_element_found_tags (GST_ELEMENT (avi), list);
gst_tag_list_free (list);
if (codec_name)
g_free (codec_name);
blockalign = strf.auds->blockalign;
bitrate = strf.auds->av_bps;
g_free (strf.auds);
avi->num_a_streams++;
break;
}
case GST_RIFF_FCC_iavs:
{
char *codec_name = NULL;
GstTagList *list = gst_tag_list_new ();
padname = g_strdup_printf ("video_%02d", avi->num_v_streams);
templ = gst_element_class_get_pad_template (klass, "video_%02d");
caps = gst_riff_create_iavs_caps (strh->fcc_handler, strh, strf.iavs,
&codec_name);
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_VIDEO_CODEC,
codec_name, NULL);
gst_element_found_tags (GST_ELEMENT (avi), list);
gst_tag_list_free (list);
if (codec_name)
g_free (codec_name);
g_free (strf.iavs);
avi->num_v_streams++;
break;
}
default:
g_assert (0);
}
/* set proper settings and add it */
pad = gst_pad_new_from_template (templ, padname);
g_free (padname);
gst_pad_set_formats_function (pad, gst_avi_demux_get_src_formats);
gst_pad_set_event_mask_function (pad, gst_avi_demux_get_event_mask);
gst_pad_set_event_function (pad, gst_avi_demux_handle_src_event);
gst_pad_set_query_type_function (pad, gst_avi_demux_get_src_query_types);
gst_pad_set_query_function (pad, gst_avi_demux_handle_src_query);
gst_pad_set_convert_function (pad, gst_avi_demux_src_convert);
gst_pad_set_getcaps_function (pad, gst_avi_demux_src_getcaps);
stream = &avi->stream[avi->num_streams];
stream->caps = caps ? caps : gst_caps_new_empty ();
stream->pad = pad;
stream->strh = strh;
stream->num = avi->num_streams;
stream->delay = 0LL;
stream->total_bytes = 0LL;
stream->total_frames = 0;
stream->current_frame = 0;
stream->current_byte = 0;
stream->current_entry = -1;
stream->skip = 0;
stream->blockalign = blockalign;
stream->bitrate = bitrate;
stream->indexes = locations;
gst_pad_set_element_private (pad, stream);
avi->num_streams++;
/* auto-negotiates */
gst_element_add_pad (GST_ELEMENT (avi), pad);
/* clean something up */
if (initdata)
gst_buffer_unref (initdata);
if (extradata)
gst_buffer_unref (extradata);
return TRUE;
skip_stream:
while (TRUE) {
if (!(tag = gst_riff_peek_tag (riff, &avi->level_up)))
return FALSE;
if (avi->level_up) {
avi->level_up--;
break;
}
if (!gst_riff_read_skip (riff))
return FALSE;
}
/* add a "NULL" stream */
avi->num_streams++;
return TRUE; /* recoverable */
}
/*
* Read an openDML-2.0 extension header.
*/
static gboolean
gst_avi_demux_stream_odml (GstAviDemux * avi)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
/* read contents */
while (TRUE) {
if (!(tag = gst_riff_peek_tag (riff, &avi->level_up)))
return FALSE;
else if (avi->level_up) {
avi->level_up--;
break;
}
switch (tag) {
case GST_RIFF_TAG_dmlh:{
gst_riff_dmlh dmlh, *_dmlh;
GstBuffer *buf;
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
if (GST_BUFFER_SIZE (buf) < sizeof (gst_riff_dmlh)) {
g_warning ("DMLH entry is too small (%d bytes, %d needed)",
GST_BUFFER_SIZE (buf), (int) sizeof (gst_riff_dmlh));
gst_buffer_unref (buf);
break;
}
_dmlh = (gst_riff_dmlh *) GST_BUFFER_DATA (buf);
dmlh.totalframes = GUINT32_FROM_LE (_dmlh->totalframes);
GST_INFO ("dmlh tag found:");
GST_INFO (" totalframes: %u", dmlh.totalframes);
avi->num_frames = dmlh.totalframes;
gst_buffer_unref (buf);
break;
}
default:
GST_WARNING ("Unknown tag " GST_FOURCC_FORMAT " in AVI header",
GST_FOURCC_ARGS (tag));
/* fall-through */
case GST_RIFF_TAG_JUNK:
if (!gst_riff_read_skip (riff))
return FALSE;
break;
}
if (avi->level_up) {
avi->level_up--;
break;
}
}
return TRUE;
}
/*
* Seek to index, read it, seek back.
* Return value indicates if we can continue processing. It
* does not indicate if index-reading succeeded.
*/
static gboolean
gst_avi_demux_stream_index (GstAviDemux * avi,
GList ** index, GList ** alloc_list)
{
GList *list = NULL;
GstBuffer *buf = NULL;
guint i;
GstEvent *event;
GstRiffRead *riff = GST_RIFF_READ (avi);
guint64 pos_before, pos_after, length;
guint32 tag;
guint index_size;
gst_avi_index_entry *index_entries = NULL;
/* first, we need to know the current position (to seek back
* when we're done) and the total length of the file. */
length = gst_bytestream_length (riff->bs);
pos_before = gst_bytestream_tell (riff->bs);
/* skip movi
*/
if (pos_before + 8 > length) {
return TRUE;
} else {
guint8 *data;
if (gst_bytestream_peek_bytes (riff->bs, &data, 8) == 8) {
guint len = GST_READ_UINT32_LE (&data[4]);
if (pos_before + 8 + len >= length) {
GST_WARNING ("No index avail");
return TRUE;
}
}
}
/* hmm... */
if (!gst_riff_read_skip (riff))
return FALSE;
/* assure that we've got data left */
pos_after = gst_bytestream_tell (riff->bs);
if (pos_after + 8 > length) {
GST_WARNING ("File said that it has an index, but there is no index data!");
goto end;
}
/* assure that it's an index */
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_idx1) {
g_warning ("No index after data, but " GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (tag));
goto end;
}
/* read index */
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
/* parse all entries */
index_size = GST_BUFFER_SIZE (buf) / sizeof (gst_riff_index_entry);
index_entries = g_malloc (index_size * sizeof (gst_avi_index_entry));
GST_INFO ("%u index entries", avi->index_size);
for (i = 0; i < index_size; i++) {
gst_riff_index_entry entry, *_entry;
avi_stream_context *stream;
gint stream_nr;
gst_avi_index_entry *target;
GstFormat format;
_entry = &((gst_riff_index_entry *) GST_BUFFER_DATA (buf))[i];
entry.id = GUINT32_FROM_LE (_entry->id);
entry.offset = GUINT32_FROM_LE (_entry->offset);
entry.flags = GUINT32_FROM_LE (_entry->flags);
entry.size = GUINT32_FROM_LE (_entry->size);
target = &index_entries[i];
if (entry.id == GST_RIFF_rec || entry.id == 0)
continue;
stream_nr = CHUNKID_TO_STREAMNR (entry.id);
if (stream_nr >= avi->num_streams || stream_nr < 0) {
GST_WARNING ("Index entry %d has invalid stream nr %d", i, stream_nr);
target->stream_nr = -1;
continue;
}
target->stream_nr = stream_nr;
stream = &avi->stream[stream_nr];
target->index_nr = i;
target->flags = entry.flags;
target->size = entry.size;
target->offset = entry.offset + 8;
/* figure out if the index is 0 based or relative to the MOVI start */
if (i == 0) {
if (target->offset < pos_before)
avi->index_offset = pos_before + 8;
else
avi->index_offset = 0;
}
target->bytes_before = stream->total_bytes;
target->frames_before = stream->total_frames;
format = GST_FORMAT_TIME;
if (stream->strh->type == GST_RIFF_FCC_auds) {
/* all audio frames are keyframes */
target->flags |= GST_RIFF_IF_KEYFRAME;
}
if (stream->strh->samplesize && stream->strh->type == GST_RIFF_FCC_auds) {
/* constant rate stream */
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes, &format, &target->ts);
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes + target->size, &format, &target->dur);
} else {
/* VBR stream */
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames, &format, &target->ts);
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames + 1, &format, &target->dur);
}
target->dur -= target->ts;
stream->total_bytes += target->size;
stream->total_frames++;
GST_DEBUG ("Adding index entry %d (%d) for stream %d of size %u "
"at offset %" G_GUINT64_FORMAT " and time %" GST_TIME_FORMAT,
target->index_nr, stream->total_frames - 1,
target->stream_nr, target->size, target->offset,
GST_TIME_ARGS (target->ts));
list = g_list_prepend (list, target);
}
/* debug our indexes */
for (i = 0; i < avi->num_streams; i++) {
avi_stream_context *stream;
stream = &avi->stream[i];
GST_DEBUG ("stream %u: %u frames, %" G_GINT64_FORMAT " bytes",
i, stream->total_frames, stream->total_bytes);
}
end:
if (buf)
gst_buffer_unref (buf);
/* seek back to the data */
if (!(event = gst_riff_read_seek (riff, pos_before))) {
g_free (index_entries);
g_list_free (list);
return FALSE;
}
gst_event_unref (event);
if (list)
*index = g_list_reverse (list);
if (index_entries)
*alloc_list = g_list_prepend (*alloc_list, index_entries);
return TRUE;
}
/*
* Sync to next data chunk.
*/
static gboolean
gst_avi_demux_skip (GstAviDemux * avi, gboolean prevent_eos)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
if (prevent_eos) {
guint64 pos, length;
guint size;
guint8 *data;
pos = gst_bytestream_tell (riff->bs);
length = gst_bytestream_length (riff->bs);
if (pos + 8 > length)
return FALSE;
if (gst_bytestream_peek_bytes (riff->bs, &data, 8) != 8)
return FALSE;
size = GST_READ_UINT32_LE (&data[4]);
if (size & 1)
size++;
/* Note, we're going to skip which might involve seeks. Therefore,
* we need 1 byte more! */
if (pos + 8 + size >= length)
return FALSE;
}
return gst_riff_read_skip (riff);
}
static gboolean
gst_avi_demux_sync (GstAviDemux * avi, guint32 * ret_tag, gboolean prevent_eos)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
guint64 length = gst_bytestream_length (riff->bs);
if (prevent_eos && gst_bytestream_tell (riff->bs) + 12 >= length)
return FALSE;
/* peek first (for the end of this 'list/movi' section) */
if (!(tag = gst_riff_peek_tag (riff, &avi->level_up)))
return FALSE;
/* if we're at top-level, we didn't read the 'movi'
* list tag yet. This can also be 'AVIX' in case of
* openDML-2.0 AVI files. Lastly, it might be idx1,
* in which case we skip it so we come at EOS. */
while (1) {
if (prevent_eos && gst_bytestream_tell (riff->bs) + 12 >= length)
return FALSE;
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
switch (tag) {
case GST_RIFF_TAG_LIST:
if (!(tag = gst_riff_peek_list (riff)))
return FALSE;
switch (tag) {
case GST_RIFF_LIST_AVIX:
if (!gst_riff_read_list (riff, &tag))
return FALSE;
break;
case GST_RIFF_LIST_movi:
if (!gst_riff_read_list (riff, &tag))
return FALSE;
/* fall-through */
case GST_RIFF_rec:
goto done;
default:
GST_WARNING ("Unknown list " GST_FOURCC_FORMAT " before AVI data",
GST_FOURCC_ARGS (tag));
/* fall-through */
case GST_RIFF_TAG_JUNK:
if (!gst_avi_demux_skip (avi, prevent_eos))
return FALSE;
break;
}
break;
default:
if ((tag & 0xff) >= '0' &&
(tag & 0xff) <= '9' &&
((tag >> 8) & 0xff) >= '0' && ((tag >> 8) & 0xff) <= '9') {
goto done;
}
/* pass-through */
case GST_RIFF_TAG_idx1:
case GST_RIFF_TAG_JUNK:
if (!gst_avi_demux_skip (avi, prevent_eos)) {
return FALSE;
}
break;
}
}
done:
/* And then, we get the data */
if (prevent_eos && gst_bytestream_tell (riff->bs) + 12 >= length)
return FALSE;
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
/* Support for rec-list files */
switch (tag) {
case GST_RIFF_TAG_LIST:
if (!(tag = gst_riff_peek_list (riff)))
return FALSE;
if (tag == GST_RIFF_rec) {
/* Simply skip the list */
if (!gst_riff_read_list (riff, &tag))
return FALSE;
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
}
break;
case GST_RIFF_TAG_JUNK:
gst_avi_demux_skip (avi, prevent_eos);
return FALSE;
}
if (ret_tag)
*ret_tag = tag;
return TRUE;
}
/*
* Scan the file for all chunks to "create" a new index.
* Return value indicates if we can continue reading the stream. It
* does not say anything about whether we created an index.
*/
static gboolean
gst_avi_demux_stream_scan (GstAviDemux * avi,
GList ** index, GList ** alloc_list)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
gst_avi_index_entry *entry, *entries = NULL;
avi_stream_context *stream;
guint64 pos = gst_bytestream_tell (riff->bs),
length = gst_bytestream_length (riff->bs);
guint32 tag;
GstEvent *event;
GList *list = NULL;
guint index_size = 0;
/* FIXME:
* - implement non-seekable source support.
*/
if (*index) {
GstEvent *event;
guint64 off;
entry = g_list_last (*index)->data;
off = entry->offset + avi->index_offset + entry->size;
if (entry->size & 1)
off++;
if (off < length) {
GST_LOG ("Incomplete index, seeking to last valid entry @ %"
G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT " (%"
G_GUINT64_FORMAT "+%u)", off, length, entry->offset, entry->size);
if (!(event = gst_riff_read_seek (riff, off)))
return FALSE;
gst_event_unref (event);
} else {
return TRUE;
}
}
GST_LOG_OBJECT (avi, "Creating index");
while (gst_avi_demux_sync (avi, &tag, TRUE)) {
gint stream_nr = CHUNKID_TO_STREAMNR (tag);
guint8 *data;
GstFormat format = GST_FORMAT_TIME;
if (stream_nr < 0 || stream_nr >= avi->num_streams)
goto next;
stream = &avi->stream[stream_nr];
/* get chunk size */
if (gst_bytestream_peek_bytes (riff->bs, &data, 8) != 8)
goto next;
/* pre-allocate */
if (index_size % 1024 == 0) {
entries = g_new (gst_avi_index_entry, 1024);
*alloc_list = g_list_prepend (*alloc_list, entries);
}
entry = &entries[index_size % 1024];
/* fill in */
entry->index_nr = index_size++;
entry->stream_nr = stream_nr;
entry->flags = GST_RIFF_IF_KEYFRAME;
entry->offset = gst_bytestream_tell (riff->bs) + 8 - avi->index_offset;
entry->size = GST_READ_UINT32_LE (&data[4]);
/* timestamps */
if (stream->strh->samplesize && stream->strh->type == GST_RIFF_FCC_auds) {
/* constant rate stream */
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes, &format, &entry->ts);
gst_pad_convert (stream->pad, GST_FORMAT_BYTES,
stream->total_bytes + entry->size, &format, &entry->dur);
} else {
/* VBR stream */
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames, &format, &entry->ts);
gst_pad_convert (stream->pad, GST_FORMAT_DEFAULT,
stream->total_frames + 1, &format, &entry->dur);
}
entry->dur -= entry->ts;
/* stream position */
entry->bytes_before = stream->total_bytes;
stream->total_bytes += entry->size;
entry->frames_before = stream->total_frames;
stream->total_frames++;
list = g_list_prepend (list, entry);
next:
if (!gst_avi_demux_skip (avi, TRUE))
break;
}
/* seek back */
if (!(event = gst_riff_read_seek (riff, pos))) {
g_list_free (list);
return FALSE;
}
gst_event_unref (event);
GST_LOG_OBJECT (avi, "index created, %d items", index_size);
*index = g_list_concat (*index, g_list_reverse (list));
return TRUE;
}
/*
* Massage index.
* We're going to go over each entry in the index and finetune
* some things we don't like about AVI. For example, a single
* chunk might be too long. Also, individual streams might be
* out-of-sync. In the first case, we cut the chunk in several
* smaller pieces. In the second case, we re-order chunk reading
* order. The end result should be a smoother playing AVI.
*/
static gint G_GNUC_UNUSED
sort (gst_avi_index_entry * a, gst_avi_index_entry * b)
{
if (a->ts > b->ts)
return 1;
else if (a->ts < b->ts)
return -1;
else
return a->stream_nr - b->stream_nr;
}
static void
gst_avi_demux_massage_index (GstAviDemux * avi,
GList * list, GList * alloc_list)
{
gst_avi_index_entry *entry;
avi_stream_context *stream;
gint i;
GList *one;
GST_LOG ("Starting index massage");
/* init frames */
for (i = 0; i < avi->num_streams; i++) {
GstFormat fmt = GST_FORMAT_TIME;
stream = &avi->stream[i];
if (stream->strh->type == GST_RIFF_FCC_vids) {
if (!gst_pad_convert (stream->pad,
GST_FORMAT_DEFAULT, stream->strh->init_frames,
&fmt, &stream->delay)) {
stream->delay = 0;
}
} else {
if (!gst_pad_convert (stream->pad,
GST_FORMAT_DEFAULT, stream->strh->init_frames,
&fmt, &stream->delay)) {
stream->delay = 0;
}
}
GST_LOG ("Adding init_time=%" GST_TIME_FORMAT " to stream %d",
GST_TIME_ARGS (stream->delay), i);
}
for (one = list; one != NULL; one = one->next) {
entry = one->data;
if (entry->stream_nr >= avi->num_streams)
continue;
stream = &avi->stream[entry->stream_nr];
entry->ts += stream->delay;
}
GST_LOG ("I'm now going to cut large chunks into smaller pieces");
/* cut chunks in small (seekable) pieces */
for (i = 0; i < avi->num_streams; i++) {
if (avi->stream[i].total_frames != 1)
continue;
for (one = list; one != NULL; one = one->next) {
entry = one->data;
if (entry->stream_nr != i)
continue;
#define MAX_DURATION (GST_SECOND / 2)
/* check for max duration of a single buffer. I suppose that
* the allocation of index entries could be improved. */
stream = &avi->stream[entry->stream_nr];
if (entry->dur > MAX_DURATION && stream->strh->type == GST_RIFF_FCC_auds) {
guint32 ideal_size = stream->bitrate / 10;
gst_avi_index_entry *entries;
gint old_size, num_added;
GList *one2;
/* copy index */
old_size = entry->size;
num_added = (entry->size - 1) / ideal_size;
avi->index_size += num_added;
entries = g_malloc (sizeof (gst_avi_index_entry) * num_added);
alloc_list = g_list_prepend (alloc_list, entries);
for (one2 = one->next; one2 != NULL; one2 = one2->next) {
gst_avi_index_entry *entry2 = one2->data;
entry2->index_nr += num_added;
if (entry2->stream_nr == entry->stream_nr)
entry2->frames_before += num_added;
}
/* new sized index chunks */
for (i = 0; i < num_added + 1; i++) {
gst_avi_index_entry *entry2;
if (i == 0) {
entry2 = entry;
} else {
entry2 = &entries[i - 1];
list = g_list_insert_before (list, one->next, entry2);
entry = one->data;
one = one->next;
memcpy (entry2, entry, sizeof (gst_avi_index_entry));
}
if (old_size >= ideal_size) {
entry2->size = ideal_size;
old_size -= ideal_size;
} else {
entry2->size = old_size;
}
entry2->dur = GST_SECOND * entry2->size / stream->bitrate;
if (i != 0) {
entry2->index_nr++;
entry2->ts += entry->dur;
entry2->offset += entry->size;
entry2->bytes_before += entry->size;
entry2->frames_before++;
}
}
}
}
}
GST_LOG ("I'm now going to reorder the index entries for time");
/* re-order for time */
list = g_list_sort (list, (GCompareFunc) sort);
GST_LOG ("Filling in index array");
avi->index_size = g_list_length (list);
avi->index_entries = g_new (gst_avi_index_entry, avi->index_size);
for (i = 0, one = list; one != NULL; one = one->next, i++) {
entry = one->data;
memcpy (&avi->index_entries[i], entry, sizeof (gst_avi_index_entry));
avi->index_entries[i].index_nr = i;
}
GST_LOG ("Freeing original index list");
g_list_foreach (alloc_list, (GFunc) g_free, NULL);
g_list_free (alloc_list);
g_list_free (list);
for (i = 0; i < avi->num_streams; i++) {
GST_LOG ("Stream %d, %d frames, %" G_GUINT64_FORMAT " bytes", i,
avi->stream[i].total_frames, avi->stream[i].total_bytes);
}
GST_LOG ("Index massaging done");
}
/*
* Read full AVI headers.
*/
gboolean
gst_avi_demux_stream_header (GstAviDemux * avi)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag, flags, streams;
GList *index = NULL, *alloc = NULL;
/* the header consists of a 'hdrl' LIST tag */
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_LIST) {
GST_ELEMENT_ERROR (avi, STREAM, DEMUX, (NULL),
("Invalid AVI header (no LIST at start): "
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (tag)));
return FALSE;
}
if (!gst_riff_read_list (riff, &tag))
return FALSE;
if (tag != GST_RIFF_LIST_hdrl) {
GST_ELEMENT_ERROR (avi, STREAM, DEMUX, (NULL),
("Invalid AVI header (no hdrl at start): "
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (tag)));
return FALSE;
}
/* the hdrl starts with a 'avih' header */
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_avih) {
GST_ELEMENT_ERROR (avi, STREAM, DEMUX, (NULL),
("Invalid AVI header (no avih at start): "
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (tag)));
return FALSE;
}
if (!gst_avi_demux_stream_avih (avi, &flags, &streams))
return FALSE;
/* now, read the elements from the header until the end */
while (TRUE) {
if (!(tag = gst_riff_peek_tag (riff, &avi->level_up)))
return FALSE;
else if (avi->level_up) {
avi->level_up--;
break;
}
switch (tag) {
case GST_RIFF_TAG_LIST:
if (!(tag = gst_riff_peek_list (riff)))
return FALSE;
switch (tag) {
case GST_RIFF_LIST_strl:
if (!gst_riff_read_list (riff, &tag) ||
!gst_avi_demux_add_stream (avi))
return FALSE;
break;
case GST_RIFF_LIST_odml:
if (!gst_riff_read_list (riff, &tag) ||
!gst_avi_demux_stream_odml (avi))
return FALSE;
break;
default:
GST_WARNING ("Unknown list " GST_FOURCC_FORMAT " in AVI header",
GST_FOURCC_ARGS (tag));
/* fall-through */
case GST_RIFF_TAG_JUNK:
if (!gst_riff_read_skip (riff))
return FALSE;
break;
}
break;
default:
GST_WARNING ("Unknown tag " GST_FOURCC_FORMAT " in AVI header",
GST_FOURCC_ARGS (tag));
/* fall-through */
case GST_RIFF_TAG_JUNK:
if (!gst_riff_read_skip (riff))
return FALSE;
break;
}
if (avi->level_up) {
avi->level_up--;
break;
}
}
if (avi->num_streams != streams) {
g_warning ("Stream header mentioned %d streams, but %d available",
streams, avi->num_streams);
}
/* Now, find the data (i.e. skip all junk between header and data) */
while (1) {
if (!(tag = gst_riff_peek_tag (riff, NULL)))
return FALSE;
if (tag != GST_RIFF_TAG_LIST) {
if (!gst_riff_read_skip (riff))
return FALSE;
continue;
}
if (!(tag = gst_riff_peek_list (riff)))
return FALSE;
if (tag != GST_RIFF_LIST_movi) {
if (tag == GST_RIFF_LIST_INFO) {
if (!gst_riff_read_list (riff, &tag) || !gst_riff_read_info (riff))
return FALSE;
} else if (!gst_riff_read_skip (riff)) {
return FALSE;
}
continue;
}
break;
}
/* create or read stream index (for seeking) */
if (avi->stream[0].indexes != NULL) {
if (!gst_avi_demux_read_subindexes (avi, &index, &alloc))
return FALSE;
}
if (!index) {
if (flags & GST_RIFF_AVIH_HASINDEX) {
if (!gst_avi_demux_stream_index (avi, &index, &alloc)) {
g_list_foreach (alloc, (GFunc) g_free, NULL);
g_list_free (alloc);
return FALSE;
}
}
/* some indexes are incomplete, continue streaming from there */
if (!index || avi->stream[0].total_frames < avi->num_frames) {
if (!gst_avi_demux_stream_scan (avi, &index, &alloc)) {
g_list_foreach (alloc, (GFunc) g_free, NULL);
g_list_free (alloc);
return FALSE;
}
}
}
if (index) {
gst_avi_demux_massage_index (avi, index, alloc);
} else {
g_list_free (index);
g_list_foreach (alloc, (GFunc) g_free, NULL);
g_list_free (alloc);
}
/* at this point we know all the streams and we can signal the no more
* pads signal */
GST_DEBUG ("signaling no more pads");
gst_element_no_more_pads (GST_ELEMENT (avi));
return TRUE;
}
/*
* Handle seek.
*/
static gboolean
gst_avi_demux_handle_seek (GstAviDemux * avi)
{
guint i;
GstEvent *event;
/* FIXME: if we seek in an openDML file, we will have multiple
* primary levels. Seeking in between those will cause havoc. */
avi->current_entry = avi->seek_entry;
for (i = 0; i < avi->num_streams; i++) {
avi_stream_context *stream = &avi->stream[i];
if (GST_PAD_IS_USABLE (stream->pad)) {
if (avi->seek_flush) {
event = gst_event_new (GST_EVENT_FLUSH);
gst_pad_push (stream->pad, GST_DATA (event));
}
event = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
avi->last_seek, NULL);
gst_pad_push (stream->pad, GST_DATA (event));
}
}
return TRUE;
}
static gboolean
gst_avi_demux_process_next_entry (GstAviDemux * avi)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
gboolean processed;
for (processed = FALSE; !processed;) {
if (avi->current_entry >= avi->index_size) {
gst_bytestream_seek (riff->bs, 0, GST_SEEK_METHOD_END);
/* get eos */
gst_riff_peek_tag (GST_RIFF_READ (avi), &avi->level_up);
gst_pad_event_default (avi->sinkpad, gst_event_new (GST_EVENT_EOS));
processed = TRUE;
} else {
GstBuffer *buf;
guint got;
gst_avi_index_entry *entry = &avi->index_entries[avi->current_entry++];
avi_stream_context *stream;
if (entry->stream_nr >= avi->num_streams) {
continue;
}
stream = &avi->stream[entry->stream_nr];
if (GST_PAD_IS_USABLE (stream->pad) && entry->size > 0) {
guint64 needed_off = entry->offset + avi->index_offset, pos;
guint32 remain;
pos = gst_bytestream_tell (riff->bs);
gst_bytestream_get_status (riff->bs, &remain, NULL);
if (pos <= needed_off && needed_off - pos <= remain) {
gst_bytestream_flush_fast (riff->bs, needed_off - pos);
} else {
GstEvent *event;
event = gst_riff_read_seek (riff, needed_off);
if (event)
gst_event_unref (event);
else {
GST_ELEMENT_ERROR (avi, RESOURCE, READ, (NULL), (NULL));
return FALSE;
}
}
if (!(buf = gst_riff_read_element_data (riff, entry->size, &got))) {
return FALSE;
}
if (entry->flags & GST_RIFF_IF_KEYFRAME) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_KEY_UNIT);
}
GST_BUFFER_TIMESTAMP (buf) = entry->ts;
GST_BUFFER_DURATION (buf) = entry->dur;
GST_DEBUG_OBJECT (avi, "Processing buffer of size %d and time %"
GST_TIME_FORMAT " on pad %s",
GST_BUFFER_SIZE (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
gst_pad_get_name (stream->pad));
gst_pad_push (stream->pad, GST_DATA (buf));
processed = TRUE;
}
stream->current_frame = entry->frames_before + 1;
stream->current_byte = entry->bytes_before + entry->size;
}
}
return TRUE;
}
/*
* Read data.
*/
gboolean
gst_avi_demux_stream_data (GstAviDemux * avi)
{
GstRiffRead *riff = GST_RIFF_READ (avi);
guint32 tag;
guint stream_nr;
if (avi->seek_offset != (guint64) - 1) {
if (!gst_avi_demux_handle_seek (avi))
return FALSE;
avi->seek_offset = (guint64) - 1;
}
/* if we have a avi->index_entries[], we don't want to read
* the stream linearly, but seek to the next ts/index_entry. */
if (avi->index_entries != NULL) {
return gst_avi_demux_process_next_entry (avi);
}
if (!gst_avi_demux_sync (avi, &tag, FALSE))
return FALSE;
stream_nr = CHUNKID_TO_STREAMNR (tag);
if (stream_nr < 0 || stream_nr >= avi->num_streams) {
/* recoverable */
GST_WARNING ("Invalid stream ID %d (" GST_FOURCC_FORMAT ")",
stream_nr, GST_FOURCC_ARGS (tag));
if (!gst_riff_read_skip (riff))
return FALSE;
} else {
avi_stream_context *stream;
GstClockTime next_ts;
GstFormat format;
GstBuffer *buf;
/* get buffer */
if (!gst_riff_read_data (riff, &tag, &buf))
return FALSE;
/* get time of this buffer */
stream = &avi->stream[stream_nr];
format = GST_FORMAT_TIME;
gst_pad_query (stream->pad, GST_QUERY_POSITION, &format, &next_ts);
/* set delay (if any) */
if (stream->strh->init_frames == stream->current_frame &&
stream->delay == 0)
stream->delay = next_ts;
stream->current_frame++;
stream->current_byte += GST_BUFFER_SIZE (buf);
/* should we skip this data? */
if (stream->skip) {
stream->skip--;
gst_buffer_unref (buf);
} else {
if (!stream->pad || !GST_PAD_IS_USABLE (stream->pad)) {
gst_buffer_unref (buf);
} else {
GstClockTime dur_ts;
GST_BUFFER_TIMESTAMP (buf) = next_ts;
gst_pad_query (stream->pad, GST_QUERY_POSITION, &format, &dur_ts);
GST_BUFFER_DURATION (buf) = dur_ts - next_ts;
GST_DEBUG ("Pushing buffer with time=%" GST_TIME_FORMAT " over pad %s",
GST_TIME_ARGS (next_ts), gst_pad_get_name (stream->pad));
gst_pad_push (stream->pad, GST_DATA (buf));
}
}
}
return TRUE;
}
static void
gst_avi_demux_loop (GstElement * element)
{
GstAviDemux *avi = GST_AVI_DEMUX (element);
switch (avi->state) {
case GST_AVI_DEMUX_START:
if (!gst_avi_demux_stream_init (avi))
return;
avi->state = GST_AVI_DEMUX_HEADER;
/* fall-through */
case GST_AVI_DEMUX_HEADER:
if (!gst_avi_demux_stream_header (avi))
return;
avi->state = GST_AVI_DEMUX_MOVI;
break;
case GST_AVI_DEMUX_MOVI:
if (!gst_avi_demux_stream_data (avi))
return;
break;
default:
g_assert (0);
}
}
static GstElementStateReturn
gst_avi_demux_change_state (GstElement * element)
{
GstAviDemux *avi = GST_AVI_DEMUX (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
gst_avi_demux_reset (avi);
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
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