/* * QDMC compatible decoder * Copyright (c) 2017 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <math.h> #include <stddef.h> #include <stdio.h> #define BITSTREAM_READER_LE #include "libavutil/channel_layout.h" #include "libavutil/thread.h" #include "avcodec.h" #include "bytestream.h" #include "get_bits.h" #include "internal.h" #include "fft.h" typedef struct QDMCTone { uint8_t mode; uint8_t phase; uint8_t offset; int16_t freq; int16_t amplitude; } QDMCTone; typedef struct QDMCContext { AVCodecContext *avctx; uint8_t frame_bits; int band_index; int frame_size; int subframe_size; int fft_offset; int buffer_offset; int nb_channels; int checksum_size; uint8_t noise[2][19][17]; QDMCTone tones[5][8192]; int nb_tones[5]; int cur_tone[5]; float alt_sin[5][31]; float fft_buffer[4][8192 * 2]; float noise2_buffer[4096 * 2]; float noise_buffer[4096 * 2]; float buffer[2 * 32768]; float *buffer_ptr; int rndval; DECLARE_ALIGNED(32, FFTComplex, cmplx)[2][512]; FFTContext fft_ctx; } QDMCContext; static float sin_table[512]; static VLC vtable[6]; static const unsigned code_prefix[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x6, 0x8, 0xA, 0xC, 0x10, 0x14, 0x18, 0x1C, 0x24, 0x2C, 0x34, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, 0x9C, 0xBC, 0xDC, 0xFC, 0x13C, 0x17C, 0x1BC, 0x1FC, 0x27C, 0x2FC, 0x37C, 0x3FC, 0x4FC, 0x5FC, 0x6FC, 0x7FC, 0x9FC, 0xBFC, 0xDFC, 0xFFC, 0x13FC, 0x17FC, 0x1BFC, 0x1FFC, 0x27FC, 0x2FFC, 0x37FC, 0x3FFC, 0x4FFC, 0x5FFC, 0x6FFC, 0x7FFC, 0x9FFC, 0xBFFC, 0xDFFC, 0xFFFC, 0x13FFC, 0x17FFC, 0x1BFFC, 0x1FFFC, 0x27FFC, 0x2FFFC, 0x37FFC, 0x3FFFC }; static const float amplitude_tab[64] = { 1.18750000f, 1.68359380f, 2.37500000f, 3.36718750f, 4.75000000f, 6.73437500f, 9.50000000f, 13.4687500f, 19.0000000f, 26.9375000f, 38.0000000f, 53.8750000f, 76.0000000f, 107.750000f, 152.000000f, 215.500000f, 304.000000f, 431.000000f, 608.000000f, 862.000000f, 1216.00000f, 1724.00000f, 2432.00000f, 3448.00000f, 4864.00000f, 6896.00000f, 9728.00000f, 13792.0000f, 19456.0000f, 27584.0000f, 38912.0000f, 55168.0000f, 77824.0000f, 110336.000f, 155648.000f, 220672.000f, 311296.000f, 441344.000f, 622592.000f, 882688.000f, 1245184.00f, 1765376.00f, 2490368.00f, 3530752.00f, 4980736.00f, 7061504.00f, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; static const uint16_t qdmc_nodes[112] = { 0, 1, 2, 4, 6, 8, 12, 16, 24, 32, 48, 56, 64, 80, 96, 120, 144, 176, 208, 240, 256, 0, 2, 4, 8, 16, 24, 32, 48, 56, 64, 80, 104, 128, 160, 208, 256, 0, 0, 0, 0, 0, 0, 2, 4, 8, 16, 32, 48, 64, 80, 112, 160, 208, 256, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 8, 16, 32, 48, 64, 96, 144, 208, 256, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 16, 32, 64, 256, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; static const uint8_t noise_bands_size[] = { 19, 14, 11, 9, 4, 2, 0 }; static const uint8_t noise_bands_selector[] = { 4, 3, 2, 1, 0, 0, 0, }; static const uint8_t noise_value_bits[] = { 12, 7, 9, 7, 10, 9, 11, 9, 9, 2, 9, 9, 9, 9, 9, 3, 9, 10, 10, 12, 2, 3, 3, 5, 5, 6, 7, }; static const uint8_t noise_value_symbols[] = { 0, 10, 11, 12, 13, 14, 15, 16, 18, 1, 20, 22, 24, 26, 28, 2, 30, 32, 34, 36, 3, 4, 5, 6, 7, 8, 9, }; static const uint16_t noise_value_codes[] = { 0xC7A, 0x002, 0x0FA, 0x03A, 0x35A, 0x1C2, 0x07A, 0x1FA, 0x17A, 0x000, 0x0DA, 0x142, 0x0C2, 0x042, 0x1DA, 0x001, 0x05A, 0x15A, 0x27A, 0x47A, 0x003, 0x005, 0x006, 0x012, 0x00A, 0x022, 0x01A, }; static const uint8_t noise_segment_length_bits[] = { 10, 8, 5, 1, 2, 4, 4, 4, 6, 7, 9, 10, }; static const uint8_t noise_segment_length_symbols[] = { 0, 13, 17, 1, 2, 3, 4, 5, 6, 7, 8, 9, }; static const uint16_t noise_segment_length_codes[] = { 0x30B, 0x8B, 0x1B, 0x0, 0x1, 0x3, 0x7, 0xF, 0x2b, 0x4B, 0xB, 0x10B, }; static const uint8_t freq_diff_bits[] = { 18, 2, 4, 4, 5, 4, 4, 5, 5, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 6, 7, 6, 6, 6, 7, 7, 7, 7, 7, 8, 9, 9, 8, 9, 11, 11, 12, 12, 13, 12, 14, 15, 18, 16, 17, }; static const uint32_t freq_diff_codes[] = { 0x2AD46, 0x1, 0x0, 0x3, 0xC, 0xA, 0x7, 0x18, 0x12, 0xE, 0x4, 0x16, 0xF, 0x1C, 0x8, 0x22, 0x26, 0x2, 0x3B, 0x34, 0x74, 0x1F, 0x14, 0x2B, 0x1B, 0x3F, 0x28, 0x54, 0x6, 0x4B, 0xB, 0x68, 0xE8, 0x46, 0xC6, 0x1E8, 0x146, 0x346, 0x546, 0x746, 0x1D46, 0xF46, 0xD46, 0x6D46, 0xAD46, 0x2D46, 0x1AD46, }; static const uint8_t amplitude_bits[] = { 13, 7, 8, 9, 10, 10, 10, 10, 10, 9, 8, 7, 6, 5, 4, 3, 3, 2, 3, 3, 4, 5, 7, 8, 9, 11, 12, 13, }; static const uint16_t amplitude_codes[] = { 0x1EC6, 0x6, 0xC2, 0x142, 0x242, 0x246, 0xC6, 0x46, 0x42, 0x146, 0xA2, 0x62, 0x26, 0x16, 0xE, 0x5, 0x4, 0x3, 0x0, 0x1, 0xA, 0x12, 0x2, 0x22, 0x1C6, 0x2C6, 0x6C6, 0xEC6, }; static const uint8_t amplitude_diff_bits[] = { 8, 2, 1, 3, 4, 5, 6, 7, 8, }; static const uint8_t amplitude_diff_codes[] = { 0xFE, 0x0, 0x1, 0x2, 0x6, 0xE, 0x1E, 0x3E, 0x7E, }; static const uint8_t phase_diff_bits[] = { 6, 2, 2, 4, 4, 6, 5, 4, 2, }; static const uint8_t phase_diff_codes[] = { 0x35, 0x2, 0x0, 0x1, 0xD, 0x15, 0x5, 0x9, 0x3, }; #define INIT_VLC_STATIC_LE(vlc, nb_bits, nb_codes, \ bits, bits_wrap, bits_size, \ codes, codes_wrap, codes_size, \ symbols, symbols_wrap, symbols_size, \ static_size) \ do { \ static VLC_TYPE table[static_size][2]; \ (vlc)->table = table; \ (vlc)->table_allocated = static_size; \ ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \ bits, bits_wrap, bits_size, \ codes, codes_wrap, codes_size, \ symbols, symbols_wrap, symbols_size, \ INIT_VLC_LE | INIT_VLC_USE_NEW_STATIC); \ } while (0) static av_cold void qdmc_init_static_data(void) { int i; INIT_VLC_STATIC_LE(&vtable[0], 12, FF_ARRAY_ELEMS(noise_value_bits), noise_value_bits, 1, 1, noise_value_codes, 2, 2, noise_value_symbols, 1, 1, 4096); INIT_VLC_STATIC_LE(&vtable[1], 10, FF_ARRAY_ELEMS(noise_segment_length_bits), noise_segment_length_bits, 1, 1, noise_segment_length_codes, 2, 2, noise_segment_length_symbols, 1, 1, 1024); INIT_VLC_STATIC_LE(&vtable[2], 13, FF_ARRAY_ELEMS(amplitude_bits), amplitude_bits, 1, 1, amplitude_codes, 2, 2, NULL, 0, 0, 8192); INIT_VLC_STATIC_LE(&vtable[3], 18, FF_ARRAY_ELEMS(freq_diff_bits), freq_diff_bits, 1, 1, freq_diff_codes, 4, 4, NULL, 0, 0, 262144); INIT_VLC_STATIC_LE(&vtable[4], 8, FF_ARRAY_ELEMS(amplitude_diff_bits), amplitude_diff_bits, 1, 1, amplitude_diff_codes, 1, 1, NULL, 0, 0, 256); INIT_VLC_STATIC_LE(&vtable[5], 6, FF_ARRAY_ELEMS(phase_diff_bits), phase_diff_bits, 1, 1, phase_diff_codes, 1, 1, NULL, 0, 0, 64); for (i = 0; i < 512; i++) sin_table[i] = sin(2.0f * i * M_PI * 0.001953125f); } static void make_noises(QDMCContext *s) { int i, j, n0, n1, n2, diff; float *nptr; for (j = 0; j < noise_bands_size[s->band_index]; j++) { n0 = qdmc_nodes[j + 21 * s->band_index ]; n1 = qdmc_nodes[j + 21 * s->band_index + 1]; n2 = qdmc_nodes[j + 21 * s->band_index + 2]; nptr = s->noise_buffer + 256 * j; for (i = 0; i + n0 < n1; i++, nptr++) nptr[0] = i / (float)(n1 - n0); diff = n2 - n1; nptr = s->noise_buffer + (j << 8) + n1 - n0; for (i = n1; i < n2; i++, nptr++, diff--) nptr[0] = diff / (float)(n2 - n1); } } static av_cold int qdmc_decode_init(AVCodecContext *avctx) { static AVOnce init_static_once = AV_ONCE_INIT; QDMCContext *s = avctx->priv_data; int ret, fft_size, fft_order, size, g, j, x; GetByteContext b; ff_thread_once(&init_static_once, qdmc_init_static_data); if (!avctx->extradata || (avctx->extradata_size < 48)) { av_log(avctx, AV_LOG_ERROR, "extradata missing or truncated\n"); return AVERROR_INVALIDDATA; } bytestream2_init(&b, avctx->extradata, avctx->extradata_size); while (bytestream2_get_bytes_left(&b) > 8) { if (bytestream2_peek_be64(&b) == (((uint64_t)MKBETAG('f','r','m','a') << 32) | (uint64_t)MKBETAG('Q','D','M','C'))) break; bytestream2_skipu(&b, 1); } bytestream2_skipu(&b, 8); if (bytestream2_get_bytes_left(&b) < 36) { av_log(avctx, AV_LOG_ERROR, "not enough extradata (%i)\n", bytestream2_get_bytes_left(&b)); return AVERROR_INVALIDDATA; } size = bytestream2_get_be32u(&b); if (size > bytestream2_get_bytes_left(&b)) { av_log(avctx, AV_LOG_ERROR, "extradata size too small, %i < %i\n", bytestream2_get_bytes_left(&b), size); return AVERROR_INVALIDDATA; } if (bytestream2_get_be32u(&b) != MKBETAG('Q','D','C','A')) { av_log(avctx, AV_LOG_ERROR, "invalid extradata, expecting QDCA\n"); return AVERROR_INVALIDDATA; } bytestream2_skipu(&b, 4); avctx->channels = s->nb_channels = bytestream2_get_be32u(&b); if (s->nb_channels <= 0 || s->nb_channels > 2) { av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); return AVERROR_INVALIDDATA; } avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; avctx->sample_rate = bytestream2_get_be32u(&b); avctx->bit_rate = bytestream2_get_be32u(&b); bytestream2_skipu(&b, 4); fft_size = bytestream2_get_be32u(&b); fft_order = av_log2(fft_size) + 1; s->checksum_size = bytestream2_get_be32u(&b); if (s->checksum_size >= 1U << 28) { av_log(avctx, AV_LOG_ERROR, "data block size too large (%u)\n", s->checksum_size); return AVERROR_INVALIDDATA; } if (avctx->sample_rate >= 32000) { x = 28000; s->frame_bits = 13; } else if (avctx->sample_rate >= 16000) { x = 20000; s->frame_bits = 12; } else { x = 16000; s->frame_bits = 11; } s->frame_size = 1 << s->frame_bits; s->subframe_size = s->frame_size >> 5; if (avctx->channels == 2) x = 3 * x / 2; s->band_index = noise_bands_selector[FFMIN(6, llrint(floor(avctx->bit_rate * 3.0 / (double)x + 0.5)))]; if ((fft_order < 7) || (fft_order > 9)) { avpriv_request_sample(avctx, "Unknown FFT order %d", fft_order); return AVERROR_PATCHWELCOME; } if (fft_size != (1 << (fft_order - 1))) { av_log(avctx, AV_LOG_ERROR, "FFT size %d not power of 2.\n", fft_size); return AVERROR_INVALIDDATA; } ret = ff_fft_init(&s->fft_ctx, fft_order, 1); if (ret < 0) return ret; avctx->sample_fmt = AV_SAMPLE_FMT_S16; for (g = 5; g > 0; g--) { for (j = 0; j < (1 << g) - 1; j++) s->alt_sin[5-g][j] = sin_table[(((j+1) << (8 - g)) & 0x1FF)]; } make_noises(s); return 0; } static av_cold int qdmc_decode_close(AVCodecContext *avctx) { QDMCContext *s = avctx->priv_data; ff_fft_end(&s->fft_ctx); return 0; } static int qdmc_get_vlc(GetBitContext *gb, VLC *table, int flag) { int v; v = get_vlc2(gb, table->table, table->bits, 1); if (v < 0) return AVERROR_INVALIDDATA; if (v) v = v - 1; else v = get_bits(gb, get_bits(gb, 3) + 1); if (flag) { if (v >= FF_ARRAY_ELEMS(code_prefix)) return AVERROR_INVALIDDATA; v = code_prefix[v] + get_bitsz(gb, v >> 2); } return v; } static int skip_label(QDMCContext *s, GetBitContext *gb) { uint32_t label = get_bits_long(gb, 32); uint16_t sum = 226, checksum = get_bits(gb, 16); const uint8_t *ptr = gb->buffer + 6; int i; if (label != MKTAG('Q', 'M', 'C', 1)) return AVERROR_INVALIDDATA; for (i = 0; i < s->checksum_size - 6; i++) sum += ptr[i]; return sum != checksum; } static int read_noise_data(QDMCContext *s, GetBitContext *gb) { int ch, j, k, v, idx, band, lastval, newval, len; for (ch = 0; ch < s->nb_channels; ch++) { for (band = 0; band < noise_bands_size[s->band_index]; band++) { v = qdmc_get_vlc(gb, &vtable[0], 0); if (v < 0) return AVERROR_INVALIDDATA; if (v & 1) v = v + 1; else v = -v; lastval = v / 2; s->noise[ch][band][0] = lastval - 1; for (j = 0; j < 15;) { len = qdmc_get_vlc(gb, &vtable[1], 1); if (len < 0) return AVERROR_INVALIDDATA; len += 1; v = qdmc_get_vlc(gb, &vtable[0], 0); if (v < 0) return AVERROR_INVALIDDATA; if (v & 1) newval = lastval + (v + 1) / 2; else newval = lastval - v / 2; idx = j + 1; if (len + idx > 16) return AVERROR_INVALIDDATA; for (k = 1; idx <= j + len; k++, idx++) s->noise[ch][band][idx] = lastval + k * (newval - lastval) / len - 1; lastval = newval; j += len; } } } return 0; } static void add_tone(QDMCContext *s, int group, int offset, int freq, int stereo_mode, int amplitude, int phase) { const int index = s->nb_tones[group]; if (index >= FF_ARRAY_ELEMS(s->tones[group])) { av_log(s->avctx, AV_LOG_WARNING, "Too many tones already in buffer, ignoring tone!\n"); return; } s->tones[group][index].offset = offset; s->tones[group][index].freq = freq; s->tones[group][index].mode = stereo_mode; s->tones[group][index].amplitude = amplitude; s->tones[group][index].phase = phase; s->nb_tones[group]++; } static int read_wave_data(QDMCContext *s, GetBitContext *gb) { int amp, phase, stereo_mode = 0, i, group, freq, group_size, group_bits; int amp2, phase2, pos2, off; for (group = 0; group < 5; group++) { group_size = 1 << (s->frame_bits - group - 1); group_bits = 4 - group; pos2 = 0; off = 0; for (i = 1; ; i = freq + 1) { int v; v = qdmc_get_vlc(gb, &vtable[3], 1); if (v < 0) return AVERROR_INVALIDDATA; freq = i + v; while (freq >= group_size - 1) { freq += 2 - group_size; pos2 += group_size; off += 1 << group_bits; } if (pos2 >= s->frame_size) break; if (s->nb_channels > 1) stereo_mode = get_bits(gb, 2); amp = qdmc_get_vlc(gb, &vtable[2], 0); if (amp < 0) return AVERROR_INVALIDDATA; phase = get_bits(gb, 3); if (stereo_mode > 1) { amp2 = qdmc_get_vlc(gb, &vtable[4], 0); if (amp2 < 0) return AVERROR_INVALIDDATA; amp2 = amp - amp2; phase2 = qdmc_get_vlc(gb, &vtable[5], 0); if (phase2 < 0) return AVERROR_INVALIDDATA; phase2 = phase - phase2; if (phase2 < 0) phase2 += 8; } if ((freq >> group_bits) + 1 < s->subframe_size) { add_tone(s, group, off, freq, stereo_mode & 1, amp, phase); if (stereo_mode > 1) add_tone(s, group, off, freq, ~stereo_mode & 1, amp2, phase2); } } } return 0; } static void lin_calc(QDMCContext *s, float amplitude, int node1, int node2, int index) { int subframe_size, i, j, k, length; float scale, *noise_ptr; scale = 0.5 * amplitude; subframe_size = s->subframe_size; if (subframe_size >= node2) subframe_size = node2; length = (subframe_size - node1) & 0xFFFC; j = node1; noise_ptr = &s->noise_buffer[256 * index]; for (i = 0; i < length; i += 4, j+= 4, noise_ptr += 4) { s->noise2_buffer[j ] += scale * noise_ptr[0]; s->noise2_buffer[j + 1] += scale * noise_ptr[1]; s->noise2_buffer[j + 2] += scale * noise_ptr[2]; s->noise2_buffer[j + 3] += scale * noise_ptr[3]; } k = length + node1; noise_ptr = s->noise_buffer + length + (index << 8); for (i = length; i < subframe_size - node1; i++, k++, noise_ptr++) s->noise2_buffer[k] += scale * noise_ptr[0]; } static void add_noise(QDMCContext *s, int ch, int current_subframe) { int i, j, aindex; float amplitude; float *im = &s->fft_buffer[0 + ch][s->fft_offset + s->subframe_size * current_subframe]; float *re = &s->fft_buffer[2 + ch][s->fft_offset + s->subframe_size * current_subframe]; memset(s->noise2_buffer, 0, 4 * s->subframe_size); for (i = 0; i < noise_bands_size[s->band_index]; i++) { if (qdmc_nodes[i + 21 * s->band_index] > s->subframe_size - 1) break; aindex = s->noise[ch][i][current_subframe / 2]; amplitude = aindex > 0 ? amplitude_tab[aindex & 0x3F] : 0.0f; lin_calc(s, amplitude, qdmc_nodes[21 * s->band_index + i], qdmc_nodes[21 * s->band_index + i + 2], i); } for (j = 2; j < s->subframe_size - 1; j++) { float rnd_re, rnd_im; s->rndval = 214013U * s->rndval + 2531011; rnd_im = ((s->rndval & 0x7FFF) - 16384.0f) * 0.000030517578f * s->noise2_buffer[j]; s->rndval = 214013U * s->rndval + 2531011; rnd_re = ((s->rndval & 0x7FFF) - 16384.0f) * 0.000030517578f * s->noise2_buffer[j]; im[j ] += rnd_im; re[j ] += rnd_re; im[j+1] -= rnd_im; re[j+1] -= rnd_re; } } static void add_wave(QDMCContext *s, int offset, int freqs, int group, int stereo_mode, int amp, int phase) { int j, group_bits, pos, pindex; float im, re, amplitude, level, *imptr, *reptr; if (s->nb_channels == 1) stereo_mode = 0; group_bits = 4 - group; pos = freqs >> (4 - group); amplitude = amplitude_tab[amp & 0x3F]; imptr = &s->fft_buffer[ stereo_mode][s->fft_offset + s->subframe_size * offset + pos]; reptr = &s->fft_buffer[2 + stereo_mode][s->fft_offset + s->subframe_size * offset + pos]; pindex = (phase << 6) - ((2 * (freqs >> (4 - group)) + 1) << 7); for (j = 0; j < (1 << (group_bits + 1)) - 1; j++) { pindex += (2 * freqs + 1) << (7 - group_bits); level = amplitude * s->alt_sin[group][j]; im = level * sin_table[ pindex & 0x1FF]; re = level * sin_table[(pindex + 128) & 0x1FF]; imptr[0] += im; imptr[1] -= im; reptr[0] += re; reptr[1] -= re; imptr += s->subframe_size; reptr += s->subframe_size; if (imptr >= &s->fft_buffer[stereo_mode][2 * s->frame_size]) { imptr = &s->fft_buffer[0 + stereo_mode][pos]; reptr = &s->fft_buffer[2 + stereo_mode][pos]; } } } static void add_wave0(QDMCContext *s, int offset, int freqs, int stereo_mode, int amp, int phase) { float level, im, re; int pos; if (s->nb_channels == 1) stereo_mode = 0; level = amplitude_tab[amp & 0x3F]; im = level * sin_table[ (phase << 6) & 0x1FF]; re = level * sin_table[((phase << 6) + 128) & 0x1FF]; pos = s->fft_offset + freqs + s->subframe_size * offset; s->fft_buffer[ stereo_mode][pos ] += im; s->fft_buffer[2 + stereo_mode][pos ] += re; s->fft_buffer[ stereo_mode][pos + 1] -= im; s->fft_buffer[2 + stereo_mode][pos + 1] -= re; } static void add_waves(QDMCContext *s, int current_subframe) { int w, g; for (g = 0; g < 4; g++) { for (w = s->cur_tone[g]; w < s->nb_tones[g]; w++) { QDMCTone *t = &s->tones[g][w]; if (current_subframe < t->offset) break; add_wave(s, t->offset, t->freq, g, t->mode, t->amplitude, t->phase); } s->cur_tone[g] = w; } for (w = s->cur_tone[4]; w < s->nb_tones[4]; w++) { QDMCTone *t = &s->tones[4][w]; if (current_subframe < t->offset) break; add_wave0(s, t->offset, t->freq, t->mode, t->amplitude, t->phase); } s->cur_tone[4] = w; } static int decode_frame(QDMCContext *s, GetBitContext *gb, int16_t *out) { int ret, ch, i, n; if (skip_label(s, gb)) return AVERROR_INVALIDDATA; s->fft_offset = s->frame_size - s->fft_offset; s->buffer_ptr = &s->buffer[s->nb_channels * s->buffer_offset]; ret = read_noise_data(s, gb); if (ret < 0) return ret; ret = read_wave_data(s, gb); if (ret < 0) return ret; for (n = 0; n < 32; n++) { float *r; for (ch = 0; ch < s->nb_channels; ch++) add_noise(s, ch, n); add_waves(s, n); for (ch = 0; ch < s->nb_channels; ch++) { for (i = 0; i < s->subframe_size; i++) { s->cmplx[ch][i].re = s->fft_buffer[ch + 2][s->fft_offset + n * s->subframe_size + i]; s->cmplx[ch][i].im = s->fft_buffer[ch + 0][s->fft_offset + n * s->subframe_size + i]; s->cmplx[ch][s->subframe_size + i].re = 0; s->cmplx[ch][s->subframe_size + i].im = 0; } } for (ch = 0; ch < s->nb_channels; ch++) { s->fft_ctx.fft_permute(&s->fft_ctx, s->cmplx[ch]); s->fft_ctx.fft_calc(&s->fft_ctx, s->cmplx[ch]); } r = &s->buffer_ptr[s->nb_channels * n * s->subframe_size]; for (i = 0; i < 2 * s->subframe_size; i++) { for (ch = 0; ch < s->nb_channels; ch++) { *r++ += s->cmplx[ch][i].re; } } r = &s->buffer_ptr[n * s->subframe_size * s->nb_channels]; for (i = 0; i < s->nb_channels * s->subframe_size; i++) { out[i] = av_clipf(r[i], INT16_MIN, INT16_MAX); } out += s->subframe_size * s->nb_channels; for (ch = 0; ch < s->nb_channels; ch++) { memset(s->fft_buffer[ch+0] + s->fft_offset + n * s->subframe_size, 0, 4 * s->subframe_size); memset(s->fft_buffer[ch+2] + s->fft_offset + n * s->subframe_size, 0, 4 * s->subframe_size); } memset(s->buffer + s->nb_channels * (n * s->subframe_size + s->frame_size + s->buffer_offset), 0, 4 * s->subframe_size * s->nb_channels); } s->buffer_offset += s->frame_size; if (s->buffer_offset >= 32768 - s->frame_size) { memcpy(s->buffer, &s->buffer[s->nb_channels * s->buffer_offset], 4 * s->frame_size * s->nb_channels); s->buffer_offset = 0; } return 0; } static av_cold void qdmc_flush(AVCodecContext *avctx) { QDMCContext *s = avctx->priv_data; memset(s->buffer, 0, sizeof(s->buffer)); memset(s->fft_buffer, 0, sizeof(s->fft_buffer)); s->fft_offset = 0; s->buffer_offset = 0; } static int qdmc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { QDMCContext *s = avctx->priv_data; AVFrame *frame = data; GetBitContext gb; int ret; if (!avpkt->data) return 0; if (avpkt->size < s->checksum_size) return AVERROR_INVALIDDATA; s->avctx = avctx; frame->nb_samples = s->frame_size; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; if ((ret = init_get_bits8(&gb, avpkt->data, s->checksum_size)) < 0) return ret; memset(s->nb_tones, 0, sizeof(s->nb_tones)); memset(s->cur_tone, 0, sizeof(s->cur_tone)); ret = decode_frame(s, &gb, (int16_t *)frame->data[0]); if (ret >= 0) { *got_frame_ptr = 1; return s->checksum_size; } qdmc_flush(avctx); return ret; } AVCodec ff_qdmc_decoder = { .name = "qdmc", .long_name = NULL_IF_CONFIG_SMALL("QDesign Music Codec 1"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_QDMC, .priv_data_size = sizeof(QDMCContext), .init = qdmc_decode_init, .close = qdmc_decode_close, .decode = qdmc_decode_frame, .flush = qdmc_flush, .capabilities = AV_CODEC_CAP_DR1, };