[FFmpeg-devel] [PATCH] ffmpeg.c: Strip off ADTS Header from AAC audio as it is needed only in TS and not needed in 3GP, MP4, FLV, ISM formats

[Chiranjeevi Melam]

All,
The patch is to strip off ADTS Header from AAC audio as it is needed only in TS and not needed in 3GP, MP4, FLV, ISM formats.
Thanks,
Chiru

diff --git a/ffmpeg/ffmpeg_orig.c b/ffmpeg/ffmpeg.c index 95b3252..f860e9a 100755
--- a/ffmpeg/ffmpeg_orig.c
+++ b/ffmpeg/ffmpeg.c
@@ -1835,6 +1835,22 @@ static int output_packet(InputStream *ist, int ist_index,
                             opkt.size = sizeof(AVPicture);
                             opkt.flags |= AV_PKT_FLAG_KEY;
                         }
+
+                        if(ost->st->codec->codec_id == CODEC_ID_AAC) {
+                            if(!strcmp(input_files[ist->file_index]->iformat->name, "mpegts") && strcmp(output_files[ost->file_index]->oformat->name, "mpegts") ) {
+                                if(opkt.data[0] == 0xff && (opkt.data[1] & 0xf0) == 0xf0) {
+                                    uint32_t offset = 7;
+                                    // skip ADTS CRC
+                                    if((opkt.data[1] & 0x1) == 0x00)
+                                        offset += 2;
+                                    opkt.data  += offset;
+                                    opkt.size  -= offset;
+                                    data_size  -= offset;
+                                    audio_size -= offset;
+                                }
+                            }
+                        }
+
                         write_frame(os, &opkt, ost->st->codec, ost->bitstream_filters);
                         ost->st->codec->frame_number++;
                         ost->frame_number++;