static int s302m_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { S302Context *s = avctx->priv_data; AVFrame *frame = data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; int block_size, ret; int i; int non_pcm_data_type = -1; int frame_size = s302m_parse_frame_header(avctx, buf, buf_size); if (frame_size < 0) return frame_size; buf_size -= AES3_HEADER_LEN; buf += AES3_HEADER_LEN; /* get output buffer */ block_size = (avctx->bits_per_raw_sample + 4) / 4; frame->nb_samples = 2 * (buf_size / block_size) / avctx->channels; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) + 32 * 48000 / frame->nb_samples; buf_size = (frame->nb_samples * avctx->channels / 2) * block_size; if (avctx->bits_per_raw_sample == 24) { uint32_t *o = (uint32_t *)frame->data[0]; for (; buf_size > 6; buf_size -= 7) { *o++ = (ff_reverse[buf[2]] << 24) | (ff_reverse[buf[1]] << 16) | (ff_reverse[buf[0]] << 8); *o++ = (ff_reverse[buf[6] & 0xf0] << 28) | (ff_reverse[buf[5]] << 20) | (ff_reverse[buf[4]] << 12) | (ff_reverse[buf[3] & 0x0f] << 4); buf += 7; } o = (uint32_t *)frame->data[0]; if (avctx->channels == 2) for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { if (o[i] || o[i+1] || o[i+2] || o[i+3]) break; if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) { non_pcm_data_type = (o[i+6] >> 16) & 0x1F; break; } } } else if (avctx->bits_per_raw_sample == 20) { uint32_t *o = (uint32_t *)frame->data[0]; for (; buf_size > 5; buf_size -= 6) { *o++ = (ff_reverse[buf[2] & 0xf0] << 28) | (ff_reverse[buf[1]] << 20) | (ff_reverse[buf[0]] << 12); *o++ = (ff_reverse[buf[5] & 0xf0] << 28) | (ff_reverse[buf[4]] << 20) | (ff_reverse[buf[3]] << 12); buf += 6; } o = (uint32_t *)frame->data[0]; if (avctx->channels == 2) for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { if (o[i] || o[i+1] || o[i+2] || o[i+3]) break; if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) { non_pcm_data_type = (o[i+6] >> 16) & 0x1F; break; } } } else { uint16_t *o = (uint16_t *)frame->data[0]; for (; buf_size > 4; buf_size -= 5) { *o++ = (ff_reverse[buf[1]] << 8) | ff_reverse[buf[0]]; *o++ = (ff_reverse[buf[4] & 0xf0] << 12) | (ff_reverse[buf[3]] << 4) | (ff_reverse[buf[2]] >> 4); buf += 5; } o = (uint16_t *)frame->data[0]; if (avctx->channels == 2) for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { if (o[i] || o[i+1] || o[i+2] || o[i+3]) break; if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) { non_pcm_data_type = (o[i+6] & 0x1F); break; } } } if (non_pcm_data_type != -1) { if (s->non_pcm_mode == 3) { av_log(avctx, AV_LOG_ERROR, "S302 non PCM mode with data type %d not supported\n", non_pcm_data_type); return AVERROR_PATCHWELCOME; } if (s->non_pcm_mode & 1) { return avpkt->size; } } avctx->sample_rate = 48000; *got_frame_ptr = 1; return avpkt->size; }