[SCM] libav/experimental: Add PCE support to the ADTS muxer.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 97d4318347bb298eed36ef53e5264cb065f7993e
Author: Alex Converse <alex.converse at gmail.com>
Date:   Wed May 13 22:59:58 2009 +0000

    Add PCE support to the ADTS muxer.
    
    Originally committed as revision 18818 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavformat/adtsenc.c b/libavformat/adtsenc.c
index 3d57724..7f2260b 100644
--- a/libavformat/adtsenc.c
+++ b/libavformat/adtsenc.c
@@ -23,6 +23,7 @@
 #include "libavcodec/get_bits.h"
 #include "libavcodec/put_bits.h"
 #include "libavcodec/internal.h"
+#include "libavcodec/mpeg4audio.h"
 #include "avformat.h"
 
 #define ADTS_HEADER_SIZE 7
@@ -32,11 +33,14 @@ typedef struct {
     int objecttype;
     int sample_rate_index;
     int channel_conf;
+    int pce_size;
+    uint8_t pce_data[MAX_PCE_SIZE];
 } ADTSContext;
 
 static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
 {
     GetBitContext gb;
+    PutBitContext pb;
 
     init_get_bits(&gb, buf, size * 8);
     adts->objecttype = get_bits(&gb, 5) - 1;
@@ -51,10 +55,6 @@ static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf,
         av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
         return -1;
     }
-    if (adts->channel_conf == 0) {
-        ff_log_missing_feature(s, "PCE based channel configuration", 0);
-        return -1;
-    }
     if (get_bits(&gb, 1)) {
         av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
         return -1;
@@ -67,6 +67,13 @@ static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf,
         ff_log_missing_feature(s, "Signaled SBR or PS", 0);
         return -1;
     }
+    if (!adts->channel_conf) {
+        init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
+
+        put_bits(&pb, 3, 5); //ID_PCE
+        adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
+        flush_put_bits(&pb);
+    }
 
     adts->write_adts = 1;
 
@@ -108,12 +115,16 @@ static int adts_write_frame_header(AVFormatContext *s, int size)
     /* adts_variable_header */
     put_bits(&pb, 1, 0);        /* copyright_identification_bit */
     put_bits(&pb, 1, 0);        /* copyright_identification_start */
-    put_bits(&pb, 13, ADTS_HEADER_SIZE + size); /* aac_frame_length */
+    put_bits(&pb, 13, ADTS_HEADER_SIZE + size + ctx->pce_size); /* aac_frame_length */
     put_bits(&pb, 11, 0x7ff);   /* adts_buffer_fullness */
     put_bits(&pb, 2, 0);        /* number_of_raw_data_blocks_in_frame */
 
     flush_put_bits(&pb);
     put_buffer(s->pb, buf, ADTS_HEADER_SIZE);
+    if (ctx->pce_size) {
+        put_buffer(s->pb, ctx->pce_data, ctx->pce_size);
+        ctx->pce_size = 0;
+    }
 
     return 0;
 }

-- 
Libav/FFmpeg packaging