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Add support for request_sample_format in ffmpeg and ffplay.

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This commit is contained in:
Justin Ruggles 2011-04-24 16:48:42 -04:00
parent 00e5da893d
commit bc778a0cea
2 changed files with 87 additions and 2 deletions
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72
ffmpeg.c
View File

@ -546,6 +546,46 @@ static void choose_sample_fmt(AVStream *st, AVCodec *codec)
}
}
/**
* Update the requested input sample format based on the output sample format.
* This is currently only used to request float output from decoders which
* support multiple sample formats, one of which is AV_SAMPLE_FMT_FLT.
* Ideally this will be removed in the future when decoders do not do format
* conversion and only output in their native format.
*/
static void update_sample_fmt(AVCodecContext *dec, AVCodec *dec_codec,
AVCodecContext *enc)
{
/* if sample formats match or a decoder sample format has already been
requested, just return */
if (enc->sample_fmt == dec->sample_fmt ||
dec->request_sample_fmt > AV_SAMPLE_FMT_NONE)
return;
/* if decoder supports more than one output format */
if (dec_codec && dec_codec->sample_fmts &&
dec_codec->sample_fmts[0] != AV_SAMPLE_FMT_NONE &&
dec_codec->sample_fmts[1] != AV_SAMPLE_FMT_NONE) {
enum AVSampleFormat *p;
int min_dec = -1, min_inc = -1;
/* find a matching sample format in the encoder */
for (p = dec_codec->sample_fmts; *p != AV_SAMPLE_FMT_NONE; p++) {
if (*p == enc->sample_fmt) {
dec->request_sample_fmt = *p;
return;
} else if (*p > enc->sample_fmt) {
min_inc = FFMIN(min_inc, *p - enc->sample_fmt);
} else
min_dec = FFMIN(min_dec, enc->sample_fmt - *p);
}
/* if none match, provide the one that matches quality closest */
dec->request_sample_fmt = min_inc > 0 ? enc->sample_fmt + min_inc :
enc->sample_fmt - min_dec;
}
}
static void choose_sample_rate(AVStream *st, AVCodec *codec)
{
if(codec && codec->supported_samplerates){
@ -751,7 +791,7 @@ need_realloc:
ffmpeg_exit(1);
}
if (enc->channels != dec->channels)
if (enc->channels != dec->channels || enc->sample_rate != dec->sample_rate)
ost->audio_resample = 1;
resample_changed = ost->resample_sample_fmt != dec->sample_fmt ||
@ -777,7 +817,7 @@ need_realloc:
ost->resample_sample_rate == enc->sample_rate) {
ost->resample = NULL;
ost->audio_resample = 0;
} else {
} else if (ost->audio_resample) {
if (dec->sample_fmt != AV_SAMPLE_FMT_S16)
fprintf(stderr, "Warning, using s16 intermediate sample format for resampling\n");
ost->resample = av_audio_resample_init(enc->channels, dec->channels,
@ -2308,6 +2348,17 @@ static int transcode(AVFormatContext **output_files,
ret = AVERROR(EINVAL);
goto dump_format;
}
/* update requested sample format for the decoder based on the
corresponding encoder sample format */
for (j = 0; j < nb_ostreams; j++) {
ost = ost_table[j];
if (ost->source_index == i) {
update_sample_fmt(ist->st->codec, codec, ost->st->codec);
break;
}
}
if (avcodec_open(ist->st->codec, codec) < 0) {
snprintf(error, sizeof(error), "Error while opening decoder for input stream #%d.%d",
ist->file_index, ist->index);
@ -3179,6 +3230,23 @@ static void opt_input_file(const char *filename)
ic->loop_input = loop_input;
/* Set AVCodecContext options so they will be seen by av_find_stream_info() */
for (i = 0; i < ic->nb_streams; i++) {
AVCodecContext *dec = ic->streams[i]->codec;
switch (dec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_AUDIO],
AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM,
NULL);
break;
case AVMEDIA_TYPE_VIDEO:
set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_VIDEO],
AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM,
NULL);
break;
}
}
/* If not enough info to get the stream parameters, we decode the
first frames to get it. (used in mpeg case for example) */
ret = av_find_stream_info(ic);

17
ffplay.c
View File

@ -2412,6 +2412,23 @@ static int decode_thread(void *arg)
if(genpts)
ic->flags |= AVFMT_FLAG_GENPTS;
/* Set AVCodecContext options so they will be seen by av_find_stream_info() */
for (i = 0; i < ic->nb_streams; i++) {
AVCodecContext *dec = ic->streams[i]->codec;
switch (dec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_AUDIO],
AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM,
NULL);
break;
case AVMEDIA_TYPE_VIDEO:
set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_VIDEO],
AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM,
NULL);
break;
}
}
err = av_find_stream_info(ic);
if (err < 0) {
fprintf(stderr, "%s: could not find codec parameters\n", is->filename);