typedef struct MP3On4DecodeContext {
int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
int chan_cfg; ///< channel config number
+ int syncword; ///< syncword patch
MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
} MP3On4DecodeContext;
s->frames = mp3Frames[s->chan_cfg];
avctx->channels = ff_mpeg4audio_channels[s->chan_cfg];
+ if (cfg.sample_rate < 16000)
+ s->syncword = 0xffe00000;
+ else
+ s->syncword = 0xfff00000;
+
/* Init the first mp3 decoder in standard way, so that all tables get builded
* We replace avctx->priv_data with the context of the first decoder so that
* decode_init() does not have to be changed.
m = s->mp3decctx[fr];
assert (m != NULL);
- // Get header
- header = AV_RB32(buf) | 0xfff00000;
+ header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
if (ff_mpa_check_header(header) < 0) { // Bad header, discard block
*data_size = 0;