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threads: default to automatic thread count detection

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This commit is contained in:
Janne Grunau 2011-12-25 11:45:05 +01:00
parent c11b92b304
commit e4e30256f8
4 changed files with 18 additions and 6 deletions
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1
Changelog
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@ -6,6 +6,7 @@ version <next>:
- Indeo 4 decoder
- SMJPEG demuxer
- Automatic thread count based on detection number of (available) CPU cores
version 0.8_beta1:

2
libavcodec/options.c
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@ -370,7 +370,7 @@ static const AVOption options[]={
{"float", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_AA_FLOAT }, INT_MIN, INT_MAX, V|D, "aa"},
#endif
{"qns", "quantizer noise shaping", OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},
{"threads", NULL, OFFSET(thread_count), AV_OPT_TYPE_INT, {.dbl = 1 }, 0, INT_MAX, V|E|D, "threads"},
{"threads", NULL, OFFSET(thread_count), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, V|E|D, "threads"},
{"auto", "detect a good number of threads", 0, AV_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, V|E|D, "threads"},
{"me_threshold", "motion estimaton threshold", OFFSET(me_threshold), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},
{"mb_threshold", "macroblock threshold", OFFSET(mb_threshold), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},

2
libavcodec/version.h
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@ -22,7 +22,7 @@
#define LIBAVCODEC_VERSION_MAJOR 53
#define LIBAVCODEC_VERSION_MINOR 32
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \

19
libavformat/utils.c
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@ -2268,9 +2268,14 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
int i, count, ret, read_size, j;
AVStream *st;
AVPacket pkt1, *pkt;
AVDictionary *one_thread_opt = NULL;
int64_t old_offset = avio_tell(ic->pb);
int orig_nb_streams = ic->nb_streams; // new streams might appear, no options for those
/* this function doesn't flush the decoders, so force thread count
* to 1 to fix behavior when thread count > number of frames in the file */
av_dict_set(&one_thread_opt, "threads", "1", 0);
for(i=0;i<ic->nb_streams;i++) {
AVCodec *codec;
st = ic->streams[i];
@ -2300,12 +2305,13 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
/* Ensure that subtitle_header is properly set. */
if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
&& codec && !st->codec->codec)
avcodec_open2(st->codec, codec, options ? &options[i] : NULL);
avcodec_open2(st->codec, codec, options ? &options[i] : &one_thread_opt);
//try to just open decoders, in case this is enough to get parameters
if(!has_codec_parameters(st->codec)){
if (codec && !st->codec->codec)
avcodec_open2(st->codec, codec, options ? &options[i] : NULL);
avcodec_open2(st->codec, codec, options ? &options[i]
: &one_thread_opt);
}
}
@ -2444,7 +2450,8 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
least one frame of codec data, this makes sure the codec initializes
the channel configuration and does not only trust the values from the container.
*/
try_decode_frame(st, pkt, (options && i < orig_nb_streams )? &options[i] : NULL);
try_decode_frame(st, pkt, (options && i < orig_nb_streams )? &options[i]
: &one_thread_opt);
st->codec_info_nb_frames++;
count++;
@ -2549,8 +2556,12 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
#endif
find_stream_info_err:
for (i=0; i < ic->nb_streams; i++)
for (i=0; i < ic->nb_streams; i++) {
if (ic->streams[i]->codec)
ic->streams[i]->codec->thread_count = 0;
av_freep(&ic->streams[i]->info);
}
av_dict_free(&one_thread_opt);
return ret;
}