| /* |
| * 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 "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(AVCodec *codec) |
| { |
| 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) |
| { |
| QDMCContext *s = avctx->priv_data; |
| int fft_size, fft_order, size, g, j, x; |
| GetByteContext b; |
| |
| 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; |
| } |
| |
| ff_fft_init(&s->fft_ctx, fft_order, 1); |
| |
| 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 = 214013 * s->rndval + 2531011; |
| rnd_im = ((s->rndval & 0x7FFF) - 16384.0f) * 0.000030517578f * s->noise2_buffer[j]; |
| s->rndval = 214013 * 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, |
| .init_static_data = qdmc_init_static_data, |
| .close = qdmc_decode_close, |
| .decode = qdmc_decode_frame, |
| .flush = qdmc_flush, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
