static av_cold int opus_decode_init(AVCodecContext *avctx) { OpusContext *c = avctx->priv_data; int ret, i, j; avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; avctx->sample_rate = 48000; c->fdsp = avpriv_float_dsp_alloc(0); if (!c->fdsp) return AVERROR(ENOMEM); /* find out the channel configuration */ ret = ff_opus_parse_extradata(avctx, c); if (ret < 0) return ret; /* allocate and init each independent decoder */ c->streams = av_mallocz_array(c->nb_streams, sizeof(*c->streams)); c->out = av_mallocz_array(c->nb_streams, 2 * sizeof(*c->out)); c->out_size = av_mallocz_array(c->nb_streams, sizeof(*c->out_size)); c->sync_buffers = av_mallocz_array(c->nb_streams, sizeof(*c->sync_buffers)); c->decoded_samples = av_mallocz_array(c->nb_streams, sizeof(*c->decoded_samples)); if (!c->streams || !c->sync_buffers || !c->decoded_samples || !c->out || !c->out_size) { c->nb_streams = 0; ret = AVERROR(ENOMEM); goto fail; } for (i = 0; i < c->nb_streams; i++) { OpusStreamContext *s = &c->streams[i]; uint64_t layout; s->output_channels = (i < c->nb_stereo_streams) ? 2 : 1; s->avctx = avctx; for (j = 0; j < s->output_channels; j++) { s->silk_output[j] = s->silk_buf[j]; s->celt_output[j] = s->celt_buf[j]; s->redundancy_output[j] = s->redundancy_buf[j]; } s->fdsp = c->fdsp; s->swr =swr_alloc(); if (!s->swr) goto fail; layout = (s->output_channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; av_opt_set_int(s->swr, "in_sample_fmt", avctx->sample_fmt, 0); av_opt_set_int(s->swr, "out_sample_fmt", avctx->sample_fmt, 0); av_opt_set_int(s->swr, "in_channel_layout", layout, 0); av_opt_set_int(s->swr, "out_channel_layout", layout, 0); av_opt_set_int(s->swr, "out_sample_rate", avctx->sample_rate, 0); av_opt_set_int(s->swr, "filter_size", 16, 0); ret = ff_silk_init(avctx, &s->silk, s->output_channels); if (ret < 0) goto fail; ret = ff_celt_init(avctx, &s->celt, s->output_channels); if (ret < 0) goto fail; s->celt_delay = av_audio_fifo_alloc(avctx->sample_fmt, s->output_channels, 1024); if (!s->celt_delay) { ret = AVERROR(ENOMEM); goto fail; } c->sync_buffers[i] = av_audio_fifo_alloc(avctx->sample_fmt, s->output_channels, 32); if (!c->sync_buffers[i]) { ret = AVERROR(ENOMEM); goto fail; } } return 0; fail: opus_decode_close(avctx); return ret; }