[SCM] libav/experimental: dont copy frame if the whole mp1/2/3 frame is available in one piece in the input
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:50:18 UTC 2013
The following commit has been merged in the experimental branch:
commit 4e2d6a456d0c72b374abc1c9903969134b7c0304
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Sat Aug 26 18:56:24 2006 +0000
dont copy frame if the whole mp1/2/3 frame is available in one piece in the input
Originally committed as revision 6103 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index 59087cd..9c50770 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -634,9 +634,7 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
}
/* no header seen : find one. We need at least MPA_HEADER_SIZE
bytes to parse it */
- len = MPA_HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
+ len = FFMIN(MPA_HEADER_SIZE - len, buf_size);
if (len > 0) {
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
@@ -736,14 +734,25 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
if (len < s->frame_size) {
if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
+ len = FFMIN(s->frame_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
}
+
+ if(s->frame_size > 0 && buf_ptr - buf == s->inbuf_ptr - s->inbuf
+ && buf_size + buf_ptr - buf >= s->frame_size){
+ if(s->header_count > 0){
+ *poutbuf = buf;
+ *poutbuf_size = s->frame_size;
+ }
+ buf_ptr = buf + s->frame_size;
+ s->inbuf_ptr = s->inbuf;
+ s->frame_size = 0;
+ break;
+ }
+
// next_data:
if (s->frame_size > 0 &&
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
--
Libav/FFmpeg packaging
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