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ffmpegdec: do buffer padding before parsing and before decoding

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FFMpeg parsing and decoding calls require to additionally allocate bytes
at the end of the input bitstream and this padding must be initialized
to zero.

https://bugzilla.gnome.org/show_bug.cgi?id=595590
This commit is contained in:
Miguel Angel Cabrera Moya 2011-04-04 16:37:42 +02:00 committed by Sebastian Dröge
parent 2289cc2d5b
commit f63d36ade8
1 changed files with 25 additions and 17 deletions
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42
ext/ffmpeg/gstffmpegdec.c
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@ -2450,7 +2450,7 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
{
GstFFMpegDec *ffmpegdec;
GstFFMpegDecClass *oclass;
guint8 *data, *bdata, *pdata;
guint8 *data, *bdata;
gint size, bsize, len, have_data;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime in_timestamp;
@ -2557,7 +2557,23 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
bdata = GST_BUFFER_DATA (inbuf);
bsize = GST_BUFFER_SIZE (inbuf);
if (ffmpegdec->do_padding) {
/* add padding */
if (ffmpegdec->padded_size < bsize + FF_INPUT_BUFFER_PADDING_SIZE) {
ffmpegdec->padded_size = bsize + FF_INPUT_BUFFER_PADDING_SIZE;
ffmpegdec->padded = g_realloc (ffmpegdec->padded, ffmpegdec->padded_size);
GST_LOG_OBJECT (ffmpegdec, "resized padding buffer to %d",
ffmpegdec->padded_size);
}
memcpy (ffmpegdec->padded, bdata, bsize);
memset (ffmpegdec->padded + bsize, 0, FF_INPUT_BUFFER_PADDING_SIZE);
bdata = ffmpegdec->padded;
}
do {
guint8 tmp_padding[FF_INPUT_BUFFER_PADDING_SIZE];
/* parse, if at all possible */
if (ffmpegdec->pctx) {
gint res;
@ -2616,26 +2632,18 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
}
if (ffmpegdec->do_padding) {
/* add padding */
if (ffmpegdec->padded_size < size + FF_INPUT_BUFFER_PADDING_SIZE) {
ffmpegdec->padded_size = size + FF_INPUT_BUFFER_PADDING_SIZE;
ffmpegdec->padded =
g_realloc (ffmpegdec->padded, ffmpegdec->padded_size);
GST_LOG_OBJECT (ffmpegdec, "resized padding buffer to %d",
ffmpegdec->padded_size);
}
memcpy (ffmpegdec->padded, data, size);
memset (ffmpegdec->padded + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
pdata = ffmpegdec->padded;
} else {
pdata = data;
/* add temporary padding */
memcpy (tmp_padding, data + size, FF_INPUT_BUFFER_PADDING_SIZE);
memset (data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
/* decode a frame of audio/video now */
len =
gst_ffmpegdec_frame (ffmpegdec, pdata, size, &have_data, dec_info,
&ret);
gst_ffmpegdec_frame (ffmpegdec, data, size, &have_data, dec_info, &ret);
if (ffmpegdec->do_padding) {
memcpy (data + size, tmp_padding, FF_INPUT_BUFFER_PADDING_SIZE);
}
if (ret != GST_FLOW_OK) {
GST_LOG_OBJECT (ffmpegdec, "breaking because of flow ret %s",