static av_cold int aac_encode_init(AVCodecContext *avctx) { AACEncContext *s = avctx->priv_data; int i; const uint8_t *sizes[2]; int lengths[2]; avctx->frame_size = 1024; for(i = 0; i < 16; i++) if(avctx->sample_rate == ff_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 > 6){ av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n", avctx->channels); 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_sine_window_init(ff_sine_1024, 1024); ff_sine_window_init(ff_sine_128, 128); s->samples = av_malloc(2 * 1024 * avctx->channels * sizeof(s->samples[0])); s->cpe = av_mallocz(sizeof(ChannelElement) * aac_chan_configs[avctx->channels-1][0]); avctx->extradata = av_malloc(2); avctx->extradata_size = 2; 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]; ff_psy_init(&s->psy, avctx, 2, sizes, lengths); s->psypp = ff_psy_preprocess_init(avctx); s->coder = &ff_aac_coders[0]; s->lambda = avctx->global_quality ? avctx->global_quality : 120; #if !CONFIG_HARDCODED_TABLES for (i = 0; i < 428; i++) ff_aac_pow2sf_tab[i] = pow(2, (i - 200)/4.); #endif /* CONFIG_HARDCODED_TABLES */ if (avctx->channels > 5) av_log(avctx, AV_LOG_ERROR, "This encoder does not yet enforce the restrictions on LFEs. " "The output will most likely be an illegal bitstream.\n"); return 0; }
static av_cold int decode_init(AVCodecContext * avctx) { NellyMoserDecodeContext *s = avctx->priv_data; s->avctx = avctx; av_lfg_init(&s->random_state, ff_random_get_seed()); ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0); dsputil_init(&s->dsp, avctx); if(s->dsp.float_to_int16 == ff_float_to_int16_c) { s->add_bias = 385; s->scale_bias = 1.0/(8*32768); } else { s->add_bias = 0; s->scale_bias = 1.0/(1*8); } /* Generate overlap window */ if (!ff_sine_128[127]) ff_sine_window_init(ff_sine_128, 128); avctx->sample_fmt = SAMPLE_FMT_S16; avctx->channel_layout = CH_LAYOUT_MONO; return 0; }
static av_cold int imc_decode_init(AVCodecContext * avctx) { int i, j; IMCContext *q = avctx->priv_data; double r1, r2; q->decoder_reset = 1; for(i = 0; i < BANDS; i++) q->old_floor[i] = 1.0; /* Build mdct window, a simple sine window normalized with sqrt(2) */ ff_sine_window_init(q->mdct_sine_window, COEFFS); for(i = 0; i < COEFFS; i++) q->mdct_sine_window[i] *= sqrt(2.0); for(i = 0; i < COEFFS/2; i++){ q->post_cos[i] = cos(i / 256.0 * M_PI); q->post_sin[i] = sin(i / 256.0 * M_PI); r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI); r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI); if (i & 0x1) { q->pre_coef1[i] = (r1 + r2) * sqrt(2.0); q->pre_coef2[i] = -(r1 - r2) * sqrt(2.0); } else { q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0); q->pre_coef2[i] = (r1 - r2) * sqrt(2.0); } q->last_fft_im[i] = 0; } /* Generate a square root table */ for(i = 0; i < 30; i++) { q->sqrt_tab[i] = sqrt(i); } /* initialize the VLC tables */ for(i = 0; i < 4 ; i++) { for(j = 0; j < 4; j++) { huffman_vlc[i][j].table = vlc_tables[vlc_offsets[i * 4 + j]]; huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j]; init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i], imc_huffman_lens[i][j], 1, 1, imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC); } } q->one_div_log2 = 1/log(2); ff_fft_init(&q->fft, 7, 1); dsputil_init(&q->dsp, avctx); avctx->sample_fmt = SAMPLE_FMT_S16; return 0; }
static av_cold int aac_encode_init(AVCodecContext *avctx) { AACEncContext *s = avctx->priv_data; int i; avctx->frame_size = 1024; for(i = 0; i < 16; i++) if(avctx->sample_rate == ff_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 > 6){ av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n", avctx->channels); return -1; } s->samplerate_index = i; dsputil_init(&s->dsp, avctx); ff_mdct_init(&s->mdct1024, 11, 0); ff_mdct_init(&s->mdct128, 8, 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_sine_window_init(ff_sine_1024, 1024); ff_sine_window_init(ff_sine_128, 128); s->samples = av_malloc(2 * 1024 * avctx->channels * sizeof(s->samples[0])); s->cpe = av_mallocz(sizeof(ChannelElement) * aac_chan_configs[avctx->channels-1][0]); if(ff_aac_psy_init(&s->psy, avctx, AAC_PSY_3GPP, aac_chan_configs[avctx->channels-1][0], 0, swb_size_1024[i], ff_aac_num_swb_1024[i], swb_size_128[i], ff_aac_num_swb_128[i]) < 0){ av_log(avctx, AV_LOG_ERROR, "Cannot initialize selected model.\n"); return -1; } avctx->extradata = av_malloc(2); avctx->extradata_size = 2; put_audio_specific_config(avctx); return 0; }
static int init_cook_mlt(COOKContext *q) { int j; int mlt_size = q->samples_per_channel; if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0) return -1; /* Initialize the MLT window: simple sine window. */ ff_sine_window_init(q->mlt_window, mlt_size); for(j=0 ; j<mlt_size ; j++) q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); /* Initialize the MDCT. */ if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1)) { av_free(q->mlt_window); return -1; } av_log(NULL,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n", av_log2(mlt_size)+1); return 0; }
static av_cold int init_cook_mlt(COOKContext *q) { int j, ret; int mlt_size = q->samples_per_channel; if ((q->mlt_window = av_malloc(mlt_size * sizeof(*q->mlt_window))) == 0) return AVERROR(ENOMEM); /* Initialize the MLT window: simple sine window. */ ff_sine_window_init(q->mlt_window, mlt_size); for(j=0 ; j<mlt_size ; j++) q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); /* Initialize the MDCT. */ if ((ret = ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1, 1.0/32768.0))) { av_free(q->mlt_window); return ret; } av_log(q->avctx,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n", av_log2(mlt_size)+1); return 0; }
static av_cold int decode_init(AVCodecContext * avctx) { NellyMoserDecodeContext *s = avctx->priv_data; s->avctx = avctx; av_init_random(0, &s->random_state); ff_mdct_init(&s->imdct_ctx, 8, 1); dsputil_init(&s->dsp, avctx); if(s->dsp.float_to_int16 == ff_float_to_int16_c) { s->add_bias = 385; s->scale_bias = 1.0/(8*32768); } else { s->add_bias = 0; s->scale_bias = 1.0/(1*8); } /* Generate overlap window */ if (!sine_window[0]) ff_sine_window_init(sine_window, 128); return 0; }