enable feeder threads

Originally committed as revision 13868 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -449,6 +449,11 @@ static int read_ffserver_streams(AVFormatContext *s, const char *filename)
         else if (st->codec->codec_type == CODEC_TYPE_VIDEO && video_stream_copy)
             st->stream_copy = 1;
 
+        if(!st->codec->thread_count)
+            st->codec->thread_count = 1;
+        if(st->codec->thread_count>1)
+            avcodec_thread_init(st->codec, st->codec->thread_count);
+
         if(st->codec->flags & CODEC_FLAG_BITEXACT)
             nopts = 1;
     }

libavformat/ffmdec.c

@@ -310,6 +310,7 @@ static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
             codec->frame_skip_cmp = get_be32(pb);
             codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
             codec->codec_tag = get_be32(pb);
+            codec->thread_count = get_byte(pb);
             break;
         case CODEC_TYPE_AUDIO:
             codec->sample_rate = get_be32(pb);

libavformat/ffmenc.c

@@ -158,6 +158,7 @@ static int ffm_write_header(AVFormatContext *s)
             put_be32(pb, codec->frame_skip_cmp);
             put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
             put_be32(pb, codec->codec_tag);
+            put_byte(pb, codec->thread_count);
             break;
         case CODEC_TYPE_AUDIO:
             put_be32(pb, codec->sample_rate);

tests/libav.regression.ref

@@ -15,7 +15,7 @@ bdb7484c68db722f66ba1630cf79844c *./tests/data/b-libav.mpg
 d6fdeb9f7083cc827f9510c6c4517dc0 *./tests/data/b-libav.swf
 335771 ./tests/data/b-libav.swf
 ./tests/data/b-libav.swf CRC=0xe14e8847
-bbdf0d67ad1035d59adc3c4cd245f3a9 *./tests/data/b-libav.ffm
+102427263dc342610721d5754fac4d87 *./tests/data/b-libav.ffm
 380928 ./tests/data/b-libav.ffm
 ./tests/data/b-libav.ffm CRC=0x2b71a386
 f8ad5bd78f4d012a8ce9570aa395ac54 *./tests/data/b-libav.flv