static int libopus_decode(AVCodecContext *avc, void *frame, int *got_frame_ptr, AVPacket *pkt) { struct libopus_context *opus = avc->priv_data; int ret, nb_samples; opus->frame.nb_samples = MAX_FRAME_SIZE; ret = avc->get_buffer(avc, &opus->frame); if (ret < 0) { av_log(avc, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } if (avc->sample_fmt == AV_SAMPLE_FMT_S16) nb_samples = opus_multistream_decode(opus->dec, pkt->data, pkt->size, (opus_int16 *)opus->frame.data[0], opus->frame.nb_samples, 0); else nb_samples = opus_multistream_decode_float(opus->dec, pkt->data, pkt->size, (float *)opus->frame.data[0], opus->frame.nb_samples, 0); if (nb_samples < 0) { av_log(avc, AV_LOG_ERROR, "Decoding error: %s\n", opus_strerror(nb_samples)); return ff_opus_error_to_averror(nb_samples); } opus->frame.nb_samples = nb_samples; *(AVFrame *)frame = opus->frame; *got_frame_ptr = 1; return pkt->size; }
static int libopus_decode(AVCodecContext *avc, void *data, int *got_frame_ptr, AVPacket *pkt) { struct libopus_context *opus = avc->priv_data; AVFrame *frame = data; int ret, nb_samples; frame->nb_samples = MAX_FRAME_SIZE; ret = ff_get_buffer(avc, frame); if (ret < 0) { av_log(avc, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } if (avc->sample_fmt == AV_SAMPLE_FMT_S16) nb_samples = opus_multistream_decode(opus->dec, pkt->data, pkt->size, (opus_int16 *)frame->data[0], frame->nb_samples, 0); else nb_samples = opus_multistream_decode_float(opus->dec, pkt->data, pkt->size, (float *)frame->data[0], frame->nb_samples, 0); if (nb_samples < 0) { av_log(avc, AV_LOG_ERROR, "Decoding error: %s\n", opus_strerror(nb_samples)); return ff_opus_error_to_averror(nb_samples); } #ifndef OPUS_SET_GAIN { int i = avc->channels * nb_samples; if (avc->sample_fmt == AV_SAMPLE_FMT_FLT) { float *pcm = (float *)frame->data[0]; for (; i > 0; i--, pcm++) *pcm = av_clipf(*pcm * opus->gain.d, -1, 1); } else { int16_t *pcm = (int16_t *)frame->data[0]; for (; i > 0; i--, pcm++) *pcm = av_clip_int16(((int64_t)opus->gain.i * *pcm) >> 16); } } #endif frame->nb_samples = nb_samples; *got_frame_ptr = 1; return pkt->size; }
static av_cold int libopus_decode_init(AVCodecContext *avc) { struct libopus_context *opus = avc->priv_data; int ret, channel_map = 0, gain_db = 0, nb_streams, nb_coupled; uint8_t mapping_arr[8] = { 0, 1 }, *mapping; avc->sample_rate = 48000; avc->sample_fmt = avc->request_sample_fmt == AV_SAMPLE_FMT_FLT ? AV_SAMPLE_FMT_FLT : AV_SAMPLE_FMT_S16; avc->channel_layout = avc->channels > 8 ? 0 : ff_vorbis_channel_layouts[avc->channels - 1]; if (avc->extradata_size >= OPUS_HEAD_SIZE) { gain_db = sign_extend(AV_RL16(avc->extradata + 16), 16); channel_map = AV_RL8 (avc->extradata + 18); } if (avc->extradata_size >= OPUS_HEAD_SIZE + 2 + avc->channels) { nb_streams = avc->extradata[OPUS_HEAD_SIZE + 0]; nb_coupled = avc->extradata[OPUS_HEAD_SIZE + 1]; if (nb_streams + nb_coupled != avc->channels) av_log(avc, AV_LOG_WARNING, "Inconsistent channel mapping.\n"); mapping = avc->extradata + OPUS_HEAD_SIZE + 2; } else { if (avc->channels > 2 || channel_map) { av_log(avc, AV_LOG_ERROR, "No channel mapping for %d channels.\n", avc->channels); return AVERROR(EINVAL); } nb_streams = 1; nb_coupled = avc->channels > 1; mapping = mapping_arr; } if (avc->channels > 2 && avc->channels <= 8) { const uint8_t *vorbis_offset = ff_vorbis_channel_layout_offsets[avc->channels - 1]; int ch; /* Remap channels from vorbis order to libav order */ for (ch = 0; ch < avc->channels; ch++) mapping_arr[ch] = mapping[vorbis_offset[ch]]; mapping = mapping_arr; } opus->dec = opus_multistream_decoder_create(avc->sample_rate, avc->channels, nb_streams, nb_coupled, mapping, &ret); if (!opus->dec) { av_log(avc, AV_LOG_ERROR, "Unable to create decoder: %s\n", opus_strerror(ret)); return ff_opus_error_to_averror(ret); } ret = opus_multistream_decoder_ctl(opus->dec, OPUS_SET_GAIN(gain_db)); if (ret != OPUS_OK) av_log(avc, AV_LOG_WARNING, "Failed to set gain: %s\n", opus_strerror(ret)); avc->delay = 3840; /* Decoder delay (in samples) at 48kHz */ avcodec_get_frame_defaults(&opus->frame); avc->coded_frame = &opus->frame; return 0; }