int ff_aac_ac3_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { AACAC3ParseContext *s = s1->priv_data; const uint8_t *buf_ptr; int len, sample_rate, bit_rate, channels, samples; *poutbuf = NULL; *poutbuf_size = 0; buf_ptr = buf; while (buf_size > 0) { int size_needed= s->frame_size ? s->frame_size : s->header_size; len = s->inbuf_ptr - s->inbuf; if(len<size_needed){ len = FFMIN(size_needed - 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) { if ((s->inbuf_ptr - s->inbuf) == s->header_size) { len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate, &samples); if (len == 0) { /* no sync found : move by one byte (inefficient, but simple!) */ memmove(s->inbuf, s->inbuf + 1, s->header_size - 1); s->inbuf_ptr--; } else { s->frame_size = len; /* update codec info */ avctx->sample_rate = sample_rate; avctx->channels = channels; /* allow downmixing to mono or stereo for AC3 */ if(avctx->request_channels > 0 && avctx->request_channels < channels && avctx->request_channels <= 2 && avctx->codec_id == CODEC_ID_AC3) { avctx->channels = avctx->request_channels; } avctx->bit_rate = bit_rate; avctx->frame_size = samples; } } } else { if(s->inbuf_ptr - s->inbuf == s->frame_size){ *poutbuf = s->inbuf; *poutbuf_size = s->frame_size; s->inbuf_ptr = s->inbuf; s->frame_size = 0; break; } } } return buf_ptr - buf; }
int ff_aac_ac3_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { AACAC3ParseContext *s = s1->priv_data; const uint8_t *buf_ptr; int len, sample_rate, bit_rate, channels, samples; *poutbuf = NULL; *poutbuf_size = 0; buf_ptr = buf; while (buf_size > 0) { int size_needed= s->frame_size ? s->frame_size : s->header_size; len = s->inbuf_ptr - s->inbuf; if(len<size_needed){ len = FFMIN(size_needed - 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) { if ((s->inbuf_ptr - s->inbuf) == s->header_size) { len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate, &samples); if (len == 0) {   memmove(s->inbuf, s->inbuf + 1, s->header_size - 1); s->inbuf_ptr--; } else { s->frame_size = len;   avctx->sample_rate = sample_rate; avctx->channels = channels;   if(avctx->request_channels > 0 && avctx->request_channels < channels && avctx->request_channels <= 2 && avctx->codec_id == CODEC_ID_AC3) { avctx->channels = avctx->request_channels; } avctx->bit_rate = bit_rate; avctx->frame_size = samples; } } } else { if(s->inbuf_ptr - s->inbuf == s->frame_size){ *poutbuf = s->inbuf; *poutbuf_size = s->frame_size; s->inbuf_ptr = s->inbuf; s->frame_size = 0; break; } } } return buf_ptr - buf; }