diff options
Diffstat (limited to 'ffmpeg/libavcodec/twinvq.c')
| -rw-r--r-- | ffmpeg/libavcodec/twinvq.c | 803 |
1 files changed, 0 insertions, 803 deletions
diff --git a/ffmpeg/libavcodec/twinvq.c b/ffmpeg/libavcodec/twinvq.c deleted file mode 100644 index 08a7a9f..0000000 --- a/ffmpeg/libavcodec/twinvq.c +++ /dev/null @@ -1,803 +0,0 @@ -/* - * TwinVQ decoder - * Copyright (c) 2009 Vitor Sessak - * - * 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 <stdint.h> - -#include "libavutil/channel_layout.h" -#include "libavutil/float_dsp.h" -#include "avcodec.h" -#include "fft.h" -#include "internal.h" -#include "lsp.h" -#include "sinewin.h" -#include "twinvq.h" - -/** - * Evaluate a single LPC amplitude spectrum envelope coefficient from the line - * spectrum pairs. - * - * @param lsp a vector of the cosine of the LSP values - * @param cos_val cos(PI*i/N) where i is the index of the LPC amplitude - * @param order the order of the LSP (and the size of the *lsp buffer). Must - * be a multiple of four. - * @return the LPC value - * - * @todo reuse code from Vorbis decoder: vorbis_floor0_decode - */ -static float eval_lpc_spectrum(const float *lsp, float cos_val, int order) -{ - int j; - float p = 0.5f; - float q = 0.5f; - float two_cos_w = 2.0f * cos_val; - - for (j = 0; j + 1 < order; j += 2 * 2) { - // Unroll the loop once since order is a multiple of four - q *= lsp[j] - two_cos_w; - p *= lsp[j + 1] - two_cos_w; - - q *= lsp[j + 2] - two_cos_w; - p *= lsp[j + 3] - two_cos_w; - } - - p *= p * (2.0f - two_cos_w); - q *= q * (2.0f + two_cos_w); - - return 0.5 / (p + q); -} - -/** - * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. - */ -static void eval_lpcenv(TwinVQContext *tctx, const float *cos_vals, float *lpc) -{ - int i; - const TwinVQModeTab *mtab = tctx->mtab; - int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub; - - for (i = 0; i < size_s / 2; i++) { - float cos_i = tctx->cos_tabs[0][i]; - lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp); - lpc[size_s - i - 1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp); - } -} - -static void interpolate(float *out, float v1, float v2, int size) -{ - int i; - float step = (v1 - v2) / (size + 1); - - for (i = 0; i < size; i++) { - v2 += step; - out[i] = v2; - } -} - -static inline float get_cos(int idx, int part, const float *cos_tab, int size) -{ - return part ? -cos_tab[size - idx - 1] - : cos_tab[idx]; -} - -/** - * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. - * Probably for speed reasons, the coefficients are evaluated as - * siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ... - * where s is an evaluated value, i is a value interpolated from the others - * and b might be either calculated or interpolated, depending on an - * unexplained condition. - * - * @param step the size of a block "siiiibiiii" - * @param in the cosine of the LSP data - * @param part is 0 for 0...PI (positive cosine values) and 1 for PI...2PI - * (negative cosine values) - * @param size the size of the whole output - */ -static inline void eval_lpcenv_or_interp(TwinVQContext *tctx, - enum TwinVQFrameType ftype, - float *out, const float *in, - int size, int step, int part) -{ - int i; - const TwinVQModeTab *mtab = tctx->mtab; - const float *cos_tab = tctx->cos_tabs[ftype]; - - // Fill the 's' - for (i = 0; i < size; i += step) - out[i] = - eval_lpc_spectrum(in, - get_cos(i, part, cos_tab, size), - mtab->n_lsp); - - // Fill the 'iiiibiiii' - for (i = step; i <= size - 2 * step; i += step) { - if (out[i + step] + out[i - step] > 1.95 * out[i] || - out[i + step] >= out[i - step]) { - interpolate(out + i - step + 1, out[i], out[i - step], step - 1); - } else { - out[i - step / 2] = - eval_lpc_spectrum(in, - get_cos(i - step / 2, part, cos_tab, size), - mtab->n_lsp); - interpolate(out + i - step + 1, out[i - step / 2], - out[i - step], step / 2 - 1); - interpolate(out + i - step / 2 + 1, out[i], - out[i - step / 2], step / 2 - 1); - } - } - - interpolate(out + size - 2 * step + 1, out[size - step], - out[size - 2 * step], step - 1); -} - -static void eval_lpcenv_2parts(TwinVQContext *tctx, enum TwinVQFrameType ftype, - const float *buf, float *lpc, - int size, int step) -{ - eval_lpcenv_or_interp(tctx, ftype, lpc, buf, size / 2, step, 0); - eval_lpcenv_or_interp(tctx, ftype, lpc + size / 2, buf, size / 2, - 2 * step, 1); - - interpolate(lpc + size / 2 - step + 1, lpc[size / 2], - lpc[size / 2 - step], step); - - twinvq_memset_float(lpc + size - 2 * step + 1, lpc[size - 2 * step], - 2 * step - 1); -} - -/** - * Inverse quantization. Read CB coefficients for cb1 and cb2 from the - * bitstream, sum the corresponding vectors and write the result to *out - * after permutation. - */ -static void dequant(TwinVQContext *tctx, const uint8_t *cb_bits, float *out, - enum TwinVQFrameType ftype, - const int16_t *cb0, const int16_t *cb1, int cb_len) -{ - int pos = 0; - int i, j; - - for (i = 0; i < tctx->n_div[ftype]; i++) { - int tmp0, tmp1; - int sign0 = 1; - int sign1 = 1; - const int16_t *tab0, *tab1; - int length = tctx->length[ftype][i >= tctx->length_change[ftype]]; - int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]); - - int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part]; - tmp0 = *cb_bits++; - if (bits == 7) { - if (tmp0 & 0x40) - sign0 = -1; - tmp0 &= 0x3F; - } - - bits = tctx->bits_main_spec[1][ftype][bitstream_second_part]; - tmp1 = *cb_bits++; - if (bits == 7) { - if (tmp1 & 0x40) - sign1 = -1; - tmp1 &= 0x3F; - } - - tab0 = cb0 + tmp0 * cb_len; - tab1 = cb1 + tmp1 * cb_len; - - for (j = 0; j < length; j++) - out[tctx->permut[ftype][pos + j]] = sign0 * tab0[j] + - sign1 * tab1[j]; - - pos += length; - } -} - -static void dec_gain(TwinVQContext *tctx, - enum TwinVQFrameType ftype, float *out) -{ - const TwinVQModeTab *mtab = tctx->mtab; - const TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame]; - int i, j; - int sub = mtab->fmode[ftype].sub; - float step = TWINVQ_AMP_MAX / ((1 << TWINVQ_GAIN_BITS) - 1); - float sub_step = TWINVQ_SUB_AMP_MAX / ((1 << TWINVQ_SUB_GAIN_BITS) - 1); - - if (ftype == TWINVQ_FT_LONG) { - for (i = 0; i < tctx->avctx->channels; i++) - out[i] = (1.0 / (1 << 13)) * - twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i], - TWINVQ_AMP_MAX, TWINVQ_MULAW_MU); - } else { - for (i = 0; i < tctx->avctx->channels; i++) { - float val = (1.0 / (1 << 23)) * - twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i], - TWINVQ_AMP_MAX, TWINVQ_MULAW_MU); - - for (j = 0; j < sub; j++) - out[i * sub + j] = - val * twinvq_mulawinv(sub_step * 0.5 + - sub_step * bits->sub_gain_bits[i * sub + j], - TWINVQ_SUB_AMP_MAX, TWINVQ_MULAW_MU); - } - } -} - -/** - * Rearrange the LSP coefficients so that they have a minimum distance of - * min_dist. This function does it exactly as described in section of 3.2.4 - * of the G.729 specification (but interestingly is different from what the - * reference decoder actually does). - */ -static void rearrange_lsp(int order, float *lsp, float min_dist) -{ - int i; - float min_dist2 = min_dist * 0.5; - for (i = 1; i < order; i++) - if (lsp[i] - lsp[i - 1] < min_dist) { - float avg = (lsp[i] + lsp[i - 1]) * 0.5; - - lsp[i - 1] = avg - min_dist2; - lsp[i] = avg + min_dist2; - } -} - -static void decode_lsp(TwinVQContext *tctx, int lpc_idx1, uint8_t *lpc_idx2, - int lpc_hist_idx, float *lsp, float *hist) -{ - const TwinVQModeTab *mtab = tctx->mtab; - int i, j; - - const float *cb = mtab->lspcodebook; - const float *cb2 = cb + (1 << mtab->lsp_bit1) * mtab->n_lsp; - const float *cb3 = cb2 + (1 << mtab->lsp_bit2) * mtab->n_lsp; - - const int8_t funny_rounding[4] = { - -2, - mtab->lsp_split == 4 ? -2 : 1, - mtab->lsp_split == 4 ? -2 : 1, - 0 - }; - - j = 0; - for (i = 0; i < mtab->lsp_split; i++) { - int chunk_end = ((i + 1) * mtab->n_lsp + funny_rounding[i]) / - mtab->lsp_split; - for (; j < chunk_end; j++) - lsp[j] = cb[lpc_idx1 * mtab->n_lsp + j] + - cb2[lpc_idx2[i] * mtab->n_lsp + j]; - } - - rearrange_lsp(mtab->n_lsp, lsp, 0.0001); - - for (i = 0; i < mtab->n_lsp; i++) { - float tmp1 = 1.0 - cb3[lpc_hist_idx * mtab->n_lsp + i]; - float tmp2 = hist[i] * cb3[lpc_hist_idx * mtab->n_lsp + i]; - hist[i] = lsp[i]; - lsp[i] = lsp[i] * tmp1 + tmp2; - } - - rearrange_lsp(mtab->n_lsp, lsp, 0.0001); - rearrange_lsp(mtab->n_lsp, lsp, 0.000095); - ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp); -} - -static void dec_lpc_spectrum_inv(TwinVQContext *tctx, float *lsp, - enum TwinVQFrameType ftype, float *lpc) -{ - int i; - int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub; - - for (i = 0; i < tctx->mtab->n_lsp; i++) - lsp[i] = 2 * cos(lsp[i]); - - switch (ftype) { - case TWINVQ_FT_LONG: - eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8); - break; - case TWINVQ_FT_MEDIUM: - eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2); - break; - case TWINVQ_FT_SHORT: - eval_lpcenv(tctx, lsp, lpc); - break; - } -} - -static const uint8_t wtype_to_wsize[] = { 0, 0, 2, 2, 2, 1, 0, 1, 1 }; - -static void imdct_and_window(TwinVQContext *tctx, enum TwinVQFrameType ftype, - int wtype, float *in, float *prev, int ch) -{ - FFTContext *mdct = &tctx->mdct_ctx[ftype]; - const TwinVQModeTab *mtab = tctx->mtab; - int bsize = mtab->size / mtab->fmode[ftype].sub; - int size = mtab->size; - float *buf1 = tctx->tmp_buf; - int j, first_wsize, wsize; // Window size - float *out = tctx->curr_frame + 2 * ch * mtab->size; - float *out2 = out; - float *prev_buf; - int types_sizes[] = { - mtab->size / mtab->fmode[TWINVQ_FT_LONG].sub, - mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub, - mtab->size / (mtab->fmode[TWINVQ_FT_SHORT].sub * 2), - }; - - wsize = types_sizes[wtype_to_wsize[wtype]]; - first_wsize = wsize; - prev_buf = prev + (size - bsize) / 2; - - for (j = 0; j < mtab->fmode[ftype].sub; j++) { - int sub_wtype = ftype == TWINVQ_FT_MEDIUM ? 8 : wtype; - - if (!j && wtype == 4) - sub_wtype = 4; - else if (j == mtab->fmode[ftype].sub - 1 && wtype == 7) - sub_wtype = 7; - - wsize = types_sizes[wtype_to_wsize[sub_wtype]]; - - mdct->imdct_half(mdct, buf1 + bsize * j, in + bsize * j); - - tctx->fdsp.vector_fmul_window(out2, prev_buf + (bsize - wsize) / 2, - buf1 + bsize * j, - ff_sine_windows[av_log2(wsize)], - wsize / 2); - out2 += wsize; - - memcpy(out2, buf1 + bsize * j + wsize / 2, - (bsize - wsize / 2) * sizeof(float)); - - out2 += ftype == TWINVQ_FT_MEDIUM ? (bsize - wsize) / 2 : bsize - wsize; - - prev_buf = buf1 + bsize * j + bsize / 2; - } - - tctx->last_block_pos[ch] = (size + first_wsize) / 2; -} - -static void imdct_output(TwinVQContext *tctx, enum TwinVQFrameType ftype, - int wtype, float **out, int offset) -{ - const TwinVQModeTab *mtab = tctx->mtab; - float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0]; - int size1, size2, i; - float *out1, *out2; - - for (i = 0; i < tctx->avctx->channels; i++) - imdct_and_window(tctx, ftype, wtype, - tctx->spectrum + i * mtab->size, - prev_buf + 2 * i * mtab->size, - i); - - if (!out) - return; - - size2 = tctx->last_block_pos[0]; - size1 = mtab->size - size2; - - out1 = &out[0][0] + offset; - memcpy(out1, prev_buf, size1 * sizeof(*out1)); - memcpy(out1 + size1, tctx->curr_frame, size2 * sizeof(*out1)); - - if (tctx->avctx->channels == 2) { - out2 = &out[1][0] + offset; - memcpy(out2, &prev_buf[2 * mtab->size], - size1 * sizeof(*out2)); - memcpy(out2 + size1, &tctx->curr_frame[2 * mtab->size], - size2 * sizeof(*out2)); - tctx->fdsp.butterflies_float(out1, out2, mtab->size); - } -} - -static void read_and_decode_spectrum(TwinVQContext *tctx, float *out, - enum TwinVQFrameType ftype) -{ - const TwinVQModeTab *mtab = tctx->mtab; - TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame]; - int channels = tctx->avctx->channels; - int sub = mtab->fmode[ftype].sub; - int block_size = mtab->size / sub; - float gain[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX]; - float ppc_shape[TWINVQ_PPC_SHAPE_LEN_MAX * TWINVQ_CHANNELS_MAX * 4]; - - int i, j; - - dequant(tctx, bits->main_coeffs, out, ftype, - mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1, - mtab->fmode[ftype].cb_len_read); - - dec_gain(tctx, ftype, gain); - - if (ftype == TWINVQ_FT_LONG) { - int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len * channels - 1) / - tctx->n_div[3]; - dequant(tctx, bits->ppc_coeffs, ppc_shape, - TWINVQ_FT_PPC, mtab->ppc_shape_cb, - mtab->ppc_shape_cb + cb_len_p * TWINVQ_PPC_SHAPE_CB_SIZE, - cb_len_p); - } - - for (i = 0; i < channels; i++) { - float *chunk = out + mtab->size * i; - float lsp[TWINVQ_LSP_COEFS_MAX]; - - for (j = 0; j < sub; j++) { - tctx->dec_bark_env(tctx, bits->bark1[i][j], - bits->bark_use_hist[i][j], i, - tctx->tmp_buf, gain[sub * i + j], ftype); - - tctx->fdsp.vector_fmul(chunk + block_size * j, - chunk + block_size * j, - tctx->tmp_buf, block_size); - } - - if (ftype == TWINVQ_FT_LONG) - tctx->decode_ppc(tctx, bits->p_coef[i], bits->g_coef[i], - ppc_shape + i * mtab->ppc_shape_len, chunk); - - decode_lsp(tctx, bits->lpc_idx1[i], bits->lpc_idx2[i], - bits->lpc_hist_idx[i], lsp, tctx->lsp_hist[i]); - - dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf); - - for (j = 0; j < mtab->fmode[ftype].sub; j++) { - tctx->fdsp.vector_fmul(chunk, chunk, tctx->tmp_buf, block_size); - chunk += block_size; - } - } -} - -const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[] = { - TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_SHORT, TWINVQ_FT_LONG, - TWINVQ_FT_MEDIUM, TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_MEDIUM, - TWINVQ_FT_MEDIUM -}; - -int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - TwinVQContext *tctx = avctx->priv_data; - const TwinVQModeTab *mtab = tctx->mtab; - float **out = NULL; - int ret; - - /* get output buffer */ - if (tctx->discarded_packets >= 2) { - frame->nb_samples = mtab->size * tctx->frames_per_packet; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - out = (float **)frame->extended_data; - } - - if (buf_size < avctx->block_align) { - av_log(avctx, AV_LOG_ERROR, - "Frame too small (%d bytes). Truncated file?\n", buf_size); - return AVERROR(EINVAL); - } - - if ((ret = tctx->read_bitstream(avctx, tctx, buf, buf_size)) < 0) - return ret; - - for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet; - tctx->cur_frame++) { - read_and_decode_spectrum(tctx, tctx->spectrum, - tctx->bits[tctx->cur_frame].ftype); - - imdct_output(tctx, tctx->bits[tctx->cur_frame].ftype, - tctx->bits[tctx->cur_frame].window_type, out, - tctx->cur_frame * mtab->size); - - FFSWAP(float *, tctx->curr_frame, tctx->prev_frame); - } - - if (tctx->discarded_packets < 2) { - tctx->discarded_packets++; - *got_frame_ptr = 0; - return buf_size; - } - - *got_frame_ptr = 1; - - // VQF can deliver packets 1 byte greater than block align - if (buf_size == avctx->block_align + 1) - return buf_size; - return avctx->block_align; -} - -/** - * Init IMDCT and windowing tables - */ -static av_cold int init_mdct_win(TwinVQContext *tctx) -{ - int i, j, ret; - const TwinVQModeTab *mtab = tctx->mtab; - int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub; - int size_m = mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub; - int channels = tctx->avctx->channels; - float norm = channels == 1 ? 2.0 : 1.0; - - for (i = 0; i < 3; i++) { - int bsize = tctx->mtab->size / tctx->mtab->fmode[i].sub; - if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1, - -sqrt(norm / bsize) / (1 << 15)))) - return ret; - } - - FF_ALLOC_OR_GOTO(tctx->avctx, tctx->tmp_buf, - mtab->size * sizeof(*tctx->tmp_buf), alloc_fail); - - FF_ALLOC_OR_GOTO(tctx->avctx, tctx->spectrum, - 2 * mtab->size * channels * sizeof(*tctx->spectrum), - alloc_fail); - FF_ALLOC_OR_GOTO(tctx->avctx, tctx->curr_frame, - 2 * mtab->size * channels * sizeof(*tctx->curr_frame), - alloc_fail); - FF_ALLOC_OR_GOTO(tctx->avctx, tctx->prev_frame, - 2 * mtab->size * channels * sizeof(*tctx->prev_frame), - alloc_fail); - - for (i = 0; i < 3; i++) { - int m = 4 * mtab->size / mtab->fmode[i].sub; - double freq = 2 * M_PI / m; - FF_ALLOC_OR_GOTO(tctx->avctx, tctx->cos_tabs[i], - (m / 4) * sizeof(*tctx->cos_tabs[i]), alloc_fail); - - for (j = 0; j <= m / 8; j++) - tctx->cos_tabs[i][j] = cos((2 * j + 1) * freq); - for (j = 1; j < m / 8; j++) - tctx->cos_tabs[i][m / 4 - j] = tctx->cos_tabs[i][j]; - } - - ff_init_ff_sine_windows(av_log2(size_m)); - ff_init_ff_sine_windows(av_log2(size_s / 2)); - ff_init_ff_sine_windows(av_log2(mtab->size)); - - return 0; - -alloc_fail: - return AVERROR(ENOMEM); -} - -/** - * Interpret the data as if it were a num_blocks x line_len[0] matrix and for - * each line do a cyclic permutation, i.e. - * abcdefghijklm -> defghijklmabc - * where the amount to be shifted is evaluated depending on the column. - */ -static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks, - int block_size, - const uint8_t line_len[2], int length_div, - enum TwinVQFrameType ftype) -{ - int i, j; - - for (i = 0; i < line_len[0]; i++) { - int shift; - - if (num_blocks == 1 || - (ftype == TWINVQ_FT_LONG && num_vect % num_blocks) || - (ftype != TWINVQ_FT_LONG && num_vect & 1) || - i == line_len[1]) { - shift = 0; - } else if (ftype == TWINVQ_FT_LONG) { - shift = i; - } else - shift = i * i; - - for (j = 0; j < num_vect && (j + num_vect * i < block_size * num_blocks); j++) - tab[i * num_vect + j] = i * num_vect + (j + shift) % num_vect; - } -} - -/** - * Interpret the input data as in the following table: - * - * @verbatim - * - * abcdefgh - * ijklmnop - * qrstuvw - * x123456 - * - * @endverbatim - * - * and transpose it, giving the output - * aiqxbjr1cks2dlt3emu4fvn5gow6hp - */ -static void transpose_perm(int16_t *out, int16_t *in, int num_vect, - const uint8_t line_len[2], int length_div) -{ - int i, j; - int cont = 0; - - for (i = 0; i < num_vect; i++) - for (j = 0; j < line_len[i >= length_div]; j++) - out[cont++] = in[j * num_vect + i]; -} - -static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size) -{ - int block_size = size / n_blocks; - int i; - - for (i = 0; i < size; i++) - out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks; -} - -static av_cold void construct_perm_table(TwinVQContext *tctx, - enum TwinVQFrameType ftype) -{ - int block_size, size; - const TwinVQModeTab *mtab = tctx->mtab; - int16_t *tmp_perm = (int16_t *)tctx->tmp_buf; - - if (ftype == TWINVQ_FT_PPC) { - size = tctx->avctx->channels; - block_size = mtab->ppc_shape_len; - } else { - size = tctx->avctx->channels * mtab->fmode[ftype].sub; - block_size = mtab->size / mtab->fmode[ftype].sub; - } - - permutate_in_line(tmp_perm, tctx->n_div[ftype], size, - block_size, tctx->length[ftype], - tctx->length_change[ftype], ftype); - - transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype], - tctx->length[ftype], tctx->length_change[ftype]); - - linear_perm(tctx->permut[ftype], tctx->permut[ftype], size, - size * block_size); -} - -static av_cold void init_bitstream_params(TwinVQContext *tctx) -{ - const TwinVQModeTab *mtab = tctx->mtab; - int n_ch = tctx->avctx->channels; - int total_fr_bits = tctx->avctx->bit_rate * mtab->size / - tctx->avctx->sample_rate; - - int lsp_bits_per_block = n_ch * (mtab->lsp_bit0 + mtab->lsp_bit1 + - mtab->lsp_split * mtab->lsp_bit2); - - int ppc_bits = n_ch * (mtab->pgain_bit + mtab->ppc_shape_bit + - mtab->ppc_period_bit); - - int bsize_no_main_cb[3], bse_bits[3], i; - enum TwinVQFrameType frametype; - - for (i = 0; i < 3; i++) - // +1 for history usage switch - bse_bits[i] = n_ch * - (mtab->fmode[i].bark_n_coef * - mtab->fmode[i].bark_n_bit + 1); - - bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits + - TWINVQ_WINDOW_TYPE_BITS + n_ch * TWINVQ_GAIN_BITS; - - for (i = 0; i < 2; i++) - bsize_no_main_cb[i] = - lsp_bits_per_block + n_ch * TWINVQ_GAIN_BITS + - TWINVQ_WINDOW_TYPE_BITS + - mtab->fmode[i].sub * (bse_bits[i] + n_ch * TWINVQ_SUB_GAIN_BITS); - - if (tctx->codec == TWINVQ_CODEC_METASOUND && !tctx->is_6kbps) { - bsize_no_main_cb[1] += 2; - bsize_no_main_cb[2] += 2; - } - - // The remaining bits are all used for the main spectrum coefficients - for (i = 0; i < 4; i++) { - int bit_size, vect_size; - int rounded_up, rounded_down, num_rounded_down, num_rounded_up; - if (i == 3) { - bit_size = n_ch * mtab->ppc_shape_bit; - vect_size = n_ch * mtab->ppc_shape_len; - } else { - bit_size = total_fr_bits - bsize_no_main_cb[i]; - vect_size = n_ch * mtab->size; - } - - tctx->n_div[i] = (bit_size + 13) / 14; - - rounded_up = (bit_size + tctx->n_div[i] - 1) / - tctx->n_div[i]; - rounded_down = (bit_size) / tctx->n_div[i]; - num_rounded_down = rounded_up * tctx->n_div[i] - bit_size; - num_rounded_up = tctx->n_div[i] - num_rounded_down; - tctx->bits_main_spec[0][i][0] = (rounded_up + 1) / 2; - tctx->bits_main_spec[1][i][0] = rounded_up / 2; - tctx->bits_main_spec[0][i][1] = (rounded_down + 1) / 2; - tctx->bits_main_spec[1][i][1] = rounded_down / 2; - tctx->bits_main_spec_change[i] = num_rounded_up; - - rounded_up = (vect_size + tctx->n_div[i] - 1) / - tctx->n_div[i]; - rounded_down = (vect_size) / tctx->n_div[i]; - num_rounded_down = rounded_up * tctx->n_div[i] - vect_size; - num_rounded_up = tctx->n_div[i] - num_rounded_down; - tctx->length[i][0] = rounded_up; - tctx->length[i][1] = rounded_down; - tctx->length_change[i] = num_rounded_up; - } - - for (frametype = TWINVQ_FT_SHORT; frametype <= TWINVQ_FT_PPC; frametype++) - construct_perm_table(tctx, frametype); -} - -av_cold int ff_twinvq_decode_close(AVCodecContext *avctx) -{ - TwinVQContext *tctx = avctx->priv_data; - int i; - - for (i = 0; i < 3; i++) { - ff_mdct_end(&tctx->mdct_ctx[i]); - av_free(tctx->cos_tabs[i]); - } - - av_free(tctx->curr_frame); - av_free(tctx->spectrum); - av_free(tctx->prev_frame); - av_free(tctx->tmp_buf); - - return 0; -} - -av_cold int ff_twinvq_decode_init(AVCodecContext *avctx) -{ - int ret; - TwinVQContext *tctx = avctx->priv_data; - - tctx->avctx = avctx; - avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; - - if (!avctx->block_align) { - avctx->block_align = tctx->frame_size + 7 >> 3; - } else if (avctx->block_align * 8 < tctx->frame_size) { - av_log(avctx, AV_LOG_ERROR, "Block align is %d bits, expected %d\n", - avctx->block_align * 8, tctx->frame_size); - return AVERROR_INVALIDDATA; - } - tctx->frames_per_packet = avctx->block_align * 8 / tctx->frame_size; - if (tctx->frames_per_packet > TWINVQ_MAX_FRAMES_PER_PACKET) { - av_log(avctx, AV_LOG_ERROR, "Too many frames per packet (%d)\n", - tctx->frames_per_packet); - return AVERROR_INVALIDDATA; - } - - avpriv_float_dsp_init(&tctx->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); - if ((ret = init_mdct_win(tctx))) { - av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n"); - ff_twinvq_decode_close(avctx); - return ret; - } - init_bitstream_params(tctx); - - twinvq_memset_float(tctx->bark_hist[0][0], 0.1, - FF_ARRAY_ELEMS(tctx->bark_hist)); - - return 0; -} |