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libavformat/mux: Add ff_choose_chroma_location() 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-05-22 13:42:24 +02:00
parent d09321b68e
commit a45cf639e6
2 changed files with 35 additions and 0 deletions
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5
libavformat/internal.h
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@ -410,6 +410,11 @@ enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
*/
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
/**
* Chooses a timebase for muxing the specified stream.
*/
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
/**
* Generate standard extradata for AVC-Intra based on width/height and field
* order.

30
libavformat/mux.c
View File

@ -115,6 +115,36 @@ AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precisio
return q;
}
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st)
{
AVCodecContext *avctx = st->codec;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(avctx->pix_fmt);
if (avctx->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED)
return avctx->chroma_sample_location;
if (pix_desc) {
if (pix_desc->log2_chroma_h == 0) {
return AVCHROMA_LOC_TOPLEFT;
} else if (pix_desc->log2_chroma_w == 1 && pix_desc->log2_chroma_h == 1) {
if (avctx->field_order == AV_FIELD_UNKNOWN || avctx->field_order == AV_FIELD_PROGRESSIVE) {
switch (avctx->codec_id) {
case AV_CODEC_ID_MJPEG:
case AV_CODEC_ID_MPEG1VIDEO: return AVCHROMA_LOC_CENTER;
}
}
if (avctx->field_order == AV_FIELD_UNKNOWN || avctx->field_order != AV_FIELD_PROGRESSIVE) {
switch (avctx->codec_id) {
case AV_CODEC_ID_MPEG2VIDEO: return AVCHROMA_LOC_LEFT;
}
}
}
}
return AVCHROMA_LOC_UNSPECIFIED;
}
int avformat_alloc_output_context2(AVFormatContext **avctx, AVOutputFormat *oformat,
const char *format, const char *filename)
{