[FFmpeg-cvslog] r15977 - trunk/libavformat/raw.c
michael
subversion
Tue Dec 2 16:43:47 CET 2008
Author: michael
Date: Tue Dec 2 16:43:47 2008
New Revision: 15977
Log:
ADTS AAC probe.
fixes issue400
Modified:
trunk/libavformat/raw.c
Modified: trunk/libavformat/raw.c
==============================================================================
--- trunk/libavformat/raw.c (original)
+++ trunk/libavformat/raw.c Tue Dec 2 16:43:47 2008
@@ -577,6 +577,38 @@ static int flac_probe(AVProbeData *p)
}
#endif
+#ifdef CONFIG_AAC_DEMUXER
+static int adts_aac_probe(AVProbeData *p)
+{
+ int max_frames = 0, first_frames = 0;
+ int fsize, frames;
+ uint8_t *buf2;
+ uint8_t *buf = p->buf;
+ uint8_t *end = buf + p->buf_size - 7;
+
+ for(; buf < end; buf= buf2+1) {
+ buf2 = buf;
+
+ for(frames = 0; buf2 < end; frames++) {
+ uint32_t header = AV_RB16(buf2);
+ if((header&0xFFF6) != 0xFFF0)
+ break;
+ fsize = (AV_RB32(buf2+3)>>13) & 0x8FFF;
+ if(fsize < 7)
+ break;
+ buf2 += fsize;
+ }
+ max_frames = FFMAX(max_frames, frames);
+ if(buf == p->buf)
+ first_frames= frames;
+ }
+ if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
+ else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
+ else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
+ else if(max_frames>=1) return 1;
+ else return 0;
+}
+#endif
/* Note: Do not forget to add new entries to the Makefile as well. */
@@ -585,7 +617,7 @@ AVInputFormat aac_demuxer = {
"aac",
NULL_IF_CONFIG_SMALL("ADTS AAC"),
0,
- NULL,
+ adts_aac_probe,
audio_read_header,
raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
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