static av_cold int aac_encode_init(AVCodecContext *avctx) { AACEncContext *s = avctx->priv_data; int i; const uint8_t *sizes[2]; uint8_t grouping[AAC_MAX_CHANNELS]; int lengths[2]; avctx->frame_size = 1024; for (i = 0; i < 16; i++) if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[i]) break; if (i == 16) { av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n", avctx->sample_rate); return -1; } if (avctx->channels > AAC_MAX_CHANNELS) { av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n", avctx->channels); return -1; } if (avctx->profile != FF_PROFILE_UNKNOWN && avctx->profile != FF_PROFILE_AAC_LOW) { av_log(avctx, AV_LOG_ERROR, "Unsupported profile %d\n", avctx->profile); return -1; } if (1024.0 * avctx->bit_rate / avctx->sample_rate > 6144 * avctx->channels) { av_log(avctx, AV_LOG_ERROR, "Too many bits per frame requested\n"); return -1; } s->samplerate_index = i; dsputil_init(&s->dsp, avctx); ff_mdct_init(&s->mdct1024, 11, 0, 1.0); ff_mdct_init(&s->mdct128, 8, 0, 1.0); // window init ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024); ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128); ff_init_ff_sine_windows(10); ff_init_ff_sine_windows(7); s->chan_map = aac_chan_configs[avctx->channels-1]; s->samples = av_malloc(2 * 1024 * avctx->channels * sizeof(s->samples[0])); s->cpe = av_mallocz(sizeof(ChannelElement) * s->chan_map[0]); avctx->extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE); avctx->extradata_size = 5; put_audio_specific_config(avctx); sizes[0] = swb_size_1024[i]; sizes[1] = swb_size_128[i]; lengths[0] = ff_aac_num_swb_1024[i]; lengths[1] = ff_aac_num_swb_128[i]; for (i = 0; i < s->chan_map[0]; i++) grouping[i] = s->chan_map[i + 1] == TYPE_CPE; ff_psy_init(&s->psy, avctx, 2, sizes, lengths, s->chan_map[0], grouping); s->psypp = ff_psy_preprocess_init(avctx); s->coder = &ff_aac_coders[2]; s->lambda = avctx->global_quality ? avctx->global_quality : 120; ff_aac_tableinit(); return 0; }