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ext/ffmpeg/gstffmpegcodecmap.c: Escape the codec_data for h264 before we put it in the extra_data because ffmpeg expe...

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Original commit message from CVS:
* ext/ffmpeg/gstffmpegcodecmap.c: (nal_escape), (copy_config),
(gst_ffmpeg_caps_with_codecid):
Escape the codec_data for h264 before we put it in the extra_data
because ffmpeg expects it escaped.
This commit is contained in:
Wim Taymans 2008-09-04 13:54:58 +00:00
parent 69e6fb742e
commit 5162694c1e
2 changed files with 113 additions and 6 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2008-09-04 Wim Taymans <wim.taymans@collabora.co.uk>
* ext/ffmpeg/gstffmpegcodecmap.c: (nal_escape), (copy_config),
(gst_ffmpeg_caps_with_codecid):
Escape the codec_data for h264 before we put it in the extra_data
because ffmpeg expects it escaped.
2008-09-04 Edward Hervey <edward.hervey@collabora.co.uk>
* configure.ac:

112
ext/ffmpeg/gstffmpegcodecmap.c
View file

@ -1615,6 +1615,86 @@ gst_ffmpeg_caps_with_codectype (enum CodecType type,
}
}
static void
nal_escape (guint8 *dst, guint8 *src, guint size, guint *destsize)
{
guint8 *dstp = dst;
guint8 *srcp = src;
guint8 *end = src + size;
gint count = 0;
while (srcp < end) {
if (count == 2 && *srcp <= 0x03 ) {
*dstp++ = 0x03;
count = 0;
}
if (*srcp == 0)
count++;
else
count = 0;
*dstp++ = *srcp++;
}
*destsize = dstp - dst;
}
/* copy the config, escaping NAL units as we iterate them, if something fails we
* copy everything and hope for the best. */
static void
copy_config (guint8 *dst, guint8 *src, guint size, guint *destsize)
{
guint8 *dstp = dst;
guint8 *srcp = src;
gint cnt, i;
guint nalsize, esize;
goto full_copy;
/* check size */
if (size < 7)
goto full_copy;
/* check version */
if (*srcp != 1)
goto full_copy;
cnt = *(srcp + 5) & 0x1f; /* Number of sps */
memcpy (dstp, srcp, 6);
srcp += 6;
dstp += 6;
for (i = 0; i < cnt; i++) {
nalsize = (srcp[0] << 8) | srcp[1];
nal_escape (dstp + 2, srcp + 2, nalsize, &esize);
dstp[0] = esize >> 8;
dstp[1] = esize & 0xff;
dstp += esize + 2;
srcp += nalsize + 2;
}
cnt = *(dstp++) = *(srcp++); /* Number of pps */
for (i = 0; i < cnt; i++) {
nalsize = (srcp[0] << 8) | srcp[1];
nal_escape (dstp + 2, srcp + 2, nalsize, &esize);
dstp[0] = esize >> 8;
dstp[1] = esize & 0xff;
dstp += esize + 2;
srcp += nalsize + 2;
}
*destsize = dstp - dst;
return;
full_copy:
{
memcpy (dst, src, size);
*destsize = size;
return;
}
}
/*
* caps_with_codecid () transforms a GstCaps for a known codec
* ID into a filled-in context.
@ -1636,20 +1716,40 @@ gst_ffmpeg_caps_with_codecid (enum CodecID codec_id,
/* extradata parsing (esds [mpeg4], wma/wmv, msmpeg4v1/2/3, etc.) */
if ((value = gst_structure_get_value (str, "codec_data"))) {
gint size;
guint size;
guint8 *data;
gboolean free = FALSE;
buf = GST_BUFFER_CAST (gst_value_get_mini_object (value));
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
/* free the old one if it is there */
if (context->extradata)
av_free (context->extradata);
/* allocate with enough padding */
context->extradata =
av_mallocz (GST_ROUND_UP_16 (size + FF_INPUT_BUFFER_PADDING_SIZE));
memcpy (context->extradata, GST_BUFFER_DATA (buf), size);
context->extradata_size = size;
if (codec_id == CODEC_ID_H264) {
guint extrasize;
/* ffmpeg h264 expects the codec_data to be escaped, there is no real
* reason for this but let's just escape it for now. Start by allocating
* enough space, x2 is more than enough. */
context->extradata =
av_mallocz (GST_ROUND_UP_16 (size * 2 + FF_INPUT_BUFFER_PADDING_SIZE));
copy_config (context->extradata, data, size, &extrasize);
context->extradata_size = extrasize;
}
else {
/* allocate with enough padding */
context->extradata =
av_mallocz (GST_ROUND_UP_16 (size + FF_INPUT_BUFFER_PADDING_SIZE));
memcpy (context->extradata, data, size);
context->extradata_size = size;
}
if (free)
gst_buffer_unref (buf);
GST_DEBUG ("have codec data of size %d", size);
} else if (context->extradata == NULL) {
/* no extradata, alloc dummy with 0 sized, some codecs insist on reading