gstreamer/gst/matroska/matroska-ids.c

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/* GStreamer Matroska muxer/demuxer
* (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* (C) 2006 Tim-Philipp Müller <tim centricular net>
*
* matroska-ids.c: matroska track context utility functions
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "matroska-ids.h"
#include <string.h>
gboolean
gst_matroska_track_init_video_context (GstMatroskaTrackContext ** p_context)
{
GstMatroskaTrackVideoContext *video_context;
g_assert (p_context != NULL && *p_context != NULL);
/* already set up? (track info might come before track type) */
if ((*p_context)->type == GST_MATROSKA_TRACK_TYPE_VIDEO) {
GST_LOG ("video context already set up");
return TRUE;
}
/* it better not have been set up as some other track type ... */
if ((*p_context)->type != 0) {
g_return_val_if_reached (FALSE);
}
video_context = g_renew (GstMatroskaTrackVideoContext, *p_context, 1);
*p_context = (GstMatroskaTrackContext *) video_context;
/* defaults */
(*p_context)->type = GST_MATROSKA_TRACK_TYPE_VIDEO;
video_context->display_width = 0;
video_context->display_height = 0;
video_context->pixel_width = 0;
video_context->pixel_height = 0;
video_context->asr_mode = 0;
video_context->fourcc = 0;
video_context->default_fps = 0.0;
video_context->earliest_time = GST_CLOCK_TIME_NONE;
return TRUE;
}
gboolean
gst_matroska_track_init_audio_context (GstMatroskaTrackContext ** p_context)
{
GstMatroskaTrackAudioContext *audio_context;
g_assert (p_context != NULL && *p_context != NULL);
/* already set up? (track info might come before track type) */
if ((*p_context)->type == GST_MATROSKA_TRACK_TYPE_AUDIO)
return TRUE;
/* it better not have been set up as some other track type ... */
if ((*p_context)->type != 0) {
g_return_val_if_reached (FALSE);
}
audio_context = g_renew (GstMatroskaTrackAudioContext, *p_context, 1);
*p_context = (GstMatroskaTrackContext *) audio_context;
/* defaults */
(*p_context)->type = GST_MATROSKA_TRACK_TYPE_AUDIO;
audio_context->channels = 1;
audio_context->samplerate = 8000;
return TRUE;
}
gboolean
gst_matroska_track_init_subtitle_context (GstMatroskaTrackContext ** p_context)
{
GstMatroskaTrackSubtitleContext *subtitle_context;
g_assert (p_context != NULL && *p_context != NULL);
/* already set up? (track info might come before track type) */
if ((*p_context)->type == GST_MATROSKA_TRACK_TYPE_SUBTITLE)
return TRUE;
/* it better not have been set up as some other track type ... */
if ((*p_context)->type != 0) {
g_return_val_if_reached (FALSE);
}
subtitle_context = g_renew (GstMatroskaTrackSubtitleContext, *p_context, 1);
*p_context = (GstMatroskaTrackContext *) subtitle_context;
(*p_context)->type = GST_MATROSKA_TRACK_TYPE_SUBTITLE;
subtitle_context->invalid_utf8 = FALSE;
subtitle_context->seen_markup_tag = FALSE;
return TRUE;
}
void
gst_matroska_register_tags (void)
{
/* TODO: register other custom tags */
}
GstBufferList *
gst_matroska_parse_xiph_stream_headers (gpointer codec_data,
gsize codec_data_size)
{
GstBufferList *list = NULL;
guint8 *p = codec_data;
gint i, offset, num_packets;
guint *length, last;
GST_MEMDUMP ("xiph codec data", codec_data, codec_data_size);
if (codec_data == NULL || codec_data_size == 0)
goto error;
/* start of the stream and vorbis audio or theora video, need to
* send the codec_priv data as first three packets */
num_packets = p[0] + 1;
GST_DEBUG ("%u stream headers, total length=%" G_GSIZE_FORMAT " bytes",
(guint) num_packets, codec_data_size);
length = g_alloca (num_packets * sizeof (guint));
last = 0;
offset = 1;
/* first packets, read length values */
for (i = 0; i < num_packets - 1; i++) {
length[i] = 0;
while (offset < codec_data_size) {
length[i] += p[offset];
if (p[offset++] != 0xff)
break;
}
last += length[i];
}
if (offset + last > codec_data_size)
goto error;
/* last packet is the remaining size */
length[i] = codec_data_size - offset - last;
list = gst_buffer_list_new ();
for (i = 0; i < num_packets; i++) {
GstBuffer *hdr;
GST_DEBUG ("buffer %d: %u bytes", i, (guint) length[i]);
if (offset + length[i] > codec_data_size)
goto error;
hdr = gst_buffer_new_wrapped (g_memdup (p + offset, length[i]), length[i]);
gst_buffer_list_add (list, hdr);
offset += length[i];
}
return list;
/* ERRORS */
error:
{
if (list != NULL)
gst_buffer_list_unref (list);
return NULL;
}
}
GstBufferList *
gst_matroska_parse_speex_stream_headers (gpointer codec_data,
gsize codec_data_size)
{
GstBufferList *list = NULL;
GstBuffer *hdr;
guint8 *pdata = codec_data;
GST_MEMDUMP ("speex codec data", codec_data, codec_data_size);
if (codec_data == NULL || codec_data_size < 80) {
GST_WARNING ("not enough codec priv data for speex headers");
return NULL;
}
if (memcmp (pdata, "Speex ", 8) != 0) {
GST_WARNING ("no Speex marker at start of stream headers");
return NULL;
}
list = gst_buffer_list_new ();
hdr = gst_buffer_new_wrapped (g_memdup (pdata, 80), 80);
gst_buffer_list_add (list, hdr);
if (codec_data_size > 80) {
hdr = gst_buffer_new_wrapped (g_memdup (pdata + 80, codec_data_size - 80),
codec_data_size - 80);
gst_buffer_list_add (list, hdr);
}
return list;
}
GstBufferList *
gst_matroska_parse_flac_stream_headers (gpointer codec_data,
gsize codec_data_size)
{
GstBufferList *list = NULL;
GstBuffer *hdr;
guint8 *pdata = codec_data;
guint len, off;
GST_MEMDUMP ("flac codec data", codec_data, codec_data_size);
/* need at least 'fLaC' marker + STREAMINFO metadata block */
if (codec_data == NULL || codec_data_size < ((4) + (4 + 34))) {
GST_WARNING ("not enough codec priv data for flac headers");
return NULL;
}
if (memcmp (pdata, "fLaC", 4) != 0) {
GST_WARNING ("no flac marker at start of stream headers");
return NULL;
}
list = gst_buffer_list_new ();
hdr = gst_buffer_new_wrapped (g_memdup (pdata, 4), 4);
gst_buffer_list_add (list, hdr);
/* skip fLaC marker */
off = 4;
/* FIXME: check size remaining */
while (off < codec_data_size) {
len = GST_READ_UINT8 (pdata + off + 1) << 16;
len |= GST_READ_UINT8 (pdata + off + 2) << 8;
len |= GST_READ_UINT8 (pdata + off + 3);
GST_DEBUG ("header packet: len=%u bytes, flags=0x%02x", len, pdata[off]);
/* FIXME: check size remaining */
hdr = gst_buffer_new_wrapped (g_memdup (pdata + off, len + 4), len + 4);
gst_buffer_list_add (list, hdr);
off += 4 + len;
}
return list;
}