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lavf: add API to apply a list of bsfs to a packet

This commit is contained in:
Rodger Combs 2015-10-07 21:23:11 -05:00
parent 3977746036
commit 4caa3e1c6c
2 changed files with 60 additions and 0 deletions
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11
libavformat/avformat.h
View File

@ -2764,6 +2764,17 @@ int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
int avformat_queue_attached_pictures(AVFormatContext *s);
/**
* Apply a list of bitstream filters to a packet.
*
* @param codec AVCodecContext, usually from an AVStream
* @param pkt the packet to apply filters to
* @param bsfc a NULL-terminated list of filters to apply
* @return >=0 on success;
* AVERROR code on failure
*/
int av_apply_bitstream_filters(AVCodecContext *codec, AVPacket *pkt,
AVBitStreamFilterContext *bsfc);
/**
* @}

49
libavformat/utils.c
View File

@ -4650,3 +4650,52 @@ uint8_t *av_stream_new_side_data(AVStream *st, enum AVPacketSideDataType type,
sd->size = size;
return data;
}
int av_apply_bitstream_filters(AVCodecContext *codec, AVPacket *pkt,
AVBitStreamFilterContext *bsfc)
{
int ret = 0;
while (bsfc) {
AVPacket new_pkt = *pkt;
int a = av_bitstream_filter_filter(bsfc, codec, NULL,
&new_pkt.data, &new_pkt.size,
pkt->data, pkt->size,
pkt->flags & AV_PKT_FLAG_KEY);
if(a == 0 && new_pkt.data != pkt->data) {
uint8_t *t = av_malloc(new_pkt.size + AV_INPUT_BUFFER_PADDING_SIZE); //the new should be a subset of the old so cannot overflow
if (t) {
memcpy(t, new_pkt.data, new_pkt.size);
memset(t + new_pkt.size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
new_pkt.data = t;
new_pkt.buf = NULL;
a = 1;
} else {
a = AVERROR(ENOMEM);
}
}
if (a > 0) {
new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
av_buffer_default_free, NULL, 0);
if (new_pkt.buf) {
pkt->side_data = NULL;
pkt->side_data_elems = 0;
av_packet_unref(pkt);
} else {
av_freep(&new_pkt.data);
a = AVERROR(ENOMEM);
}
}
if (a < 0) {
av_log(codec, AV_LOG_ERROR,
"Failed to open bitstream filter %s for stream %d with codec %s",
bsfc->filter->name, pkt->stream_index,
codec->codec ? codec->codec->name : "copy");
ret = a;
break;
}
*pkt = new_pkt;
bsfc = bsfc->next;
}
return ret;
}