---
libavcodec/Makefile | 2 +-
libavcodec/twinvq.c | 662 +-------------------------------------------
libavcodec/twinvq_common.c | 562 +++++++++++++++++++++++++++++++++++++
libavcodec/twinvq_common.h | 160 +++++++++++
4 files changed, 732 insertions(+), 654 deletions(-)
create mode 100644 libavcodec/twinvq_common.c
create mode 100644 libavcodec/twinvq_common.h
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index d9c6e33..42ab007 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -355,7 +355,7 @@ OBJS-$(CONFIG_TRUESPEECH_DECODER) += truespeech.o
OBJS-$(CONFIG_TSCC_DECODER) += tscc.o msrledec.o
OBJS-$(CONFIG_TSCC2_DECODER) += tscc2.o
OBJS-$(CONFIG_TTA_DECODER) += tta.o
-OBJS-$(CONFIG_TWINVQ_DECODER) += twinvq.o
+OBJS-$(CONFIG_TWINVQ_DECODER) += twinvq.o twinvq_common.o
OBJS-$(CONFIG_TXD_DECODER) += txd.o s3tc.o
OBJS-$(CONFIG_ULTI_DECODER) += ulti.o
OBJS-$(CONFIG_UTVIDEO_DECODER) += utvideodec.o utvideo.o
diff --git a/libavcodec/twinvq.c b/libavcodec/twinvq.c
index a4c1e93..36efdf5 100644
--- a/libavcodec/twinvq.c
+++ b/libavcodec/twinvq.c
@@ -31,68 +31,9 @@
#include <math.h>
#include <stdint.h>
+#include "twinvq_common.h"
#include "twinvq_data.h"
-enum FrameType {
- FT_SHORT = 0, ///< Short frame (divided in n sub-blocks)
- FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks)
- FT_LONG, ///< Long frame (single sub-block + PPC)
- FT_PPC, ///< Periodic Peak Component (part of the long frame)
-};
-
-/**
- * Parameters and tables that are different for each frame type
- */
-struct FrameMode {
- uint8_t sub; ///< Number subblocks in each frame
- const uint16_t *bark_tab;
-
- /** number of distinct bark scale envelope values */
- uint8_t bark_env_size;
-
- const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE)
- uint8_t bark_n_coef;///< number of BSE CB coefficients to read
- uint8_t bark_n_bit; ///< number of bits of the BSE coefs
-
- //@{
- /** main codebooks for spectrum data */
- const int16_t *cb0;
- const int16_t *cb1;
- //@}
-
- uint8_t cb_len_read; ///< number of spectrum coefficients to read
-};
-
-/**
- * Parameters and tables that are different for every combination of
- * bitrate/sample rate
- */
-typedef struct {
- struct FrameMode fmode[3]; ///< frame type-dependant parameters
-
- uint16_t size; ///< frame size in samples
- uint8_t n_lsp; ///< number of lsp coefficients
- const float *lspcodebook;
-
- /* number of bits of the different LSP CB coefficients */
- uint8_t lsp_bit0;
- uint8_t lsp_bit1;
- uint8_t lsp_bit2;
-
- uint8_t lsp_split; ///< number of CB entries for the LSP decoding
- const int16_t *ppc_shape_cb; ///< PPC shape CB
-
- /** number of the bits for the PPC period value */
- uint8_t ppc_period_bit;
-
- uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs
- uint8_t ppc_shape_len; ///< size of PPC shape CB
- uint8_t pgain_bit; ///< bits for PPC gain
-
- /** constant for peak period to peak width conversion */
- uint16_t peak_per2wid;
-} ModeTab;
-
static const ModeTab mode_08_08 = {
{
{ 8, bark_tab_s08_64, 10, tab.fcb08s , 1, 5, tab.cb0808s0,
tab.cb0808s1, 18},
@@ -174,186 +115,6 @@ static const ModeTab mode_44_48 = {
2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
};
-typedef struct TwinContext {
- AVCodecContext *avctx;
- AVFloatDSPContext fdsp;
- FFTContext mdct_ctx[3];
-
- const ModeTab *mtab;
-
- // history
- float lsp_hist[2][20]; ///< LSP coefficients of the last frame
- float bark_hist[3][2][40]; ///< BSE coefficients of last frame
-
- // bitstream parameters
- int16_t permut[4][4096];
- uint8_t length[4][2]; ///< main codebook stride
- uint8_t length_change[4];
- uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook
- int bits_main_spec_change[4];
- int n_div[4];
-
- float *spectrum;
- float *curr_frame; ///< non-interleaved output
- float *prev_frame; ///< non-interleaved previous frame
- int last_block_pos[2];
- int discarded_packets;
-
- float *cos_tabs[3];
-
- // scratch buffers
- float *tmp_buf;
-} TwinContext;
-
-#define PPC_SHAPE_CB_SIZE 64
-#define PPC_SHAPE_LEN_MAX 60
-#define SUB_AMP_MAX 4500.0
-#define MULAW_MU 100.0
-#define GAIN_BITS 8
-#define AMP_MAX 13000.0
-#define SUB_GAIN_BITS 5
-#define WINDOW_TYPE_BITS 4
-#define PGAIN_MU 200
-#define LSP_COEFS_MAX 20
-#define LSP_SPLIT_MAX 4
-#define CHANNELS_MAX 2
-#define SUBBLOCKS_MAX 16
-#define BARK_N_COEF_MAX 4
-
-/** @note not speed critical, hence not optimized */
-static void memset_float(float *buf, float val, int size)
-{
- while (size--)
- *buf++ = val;
-}
-
-/**
- * Evaluate a single LPC amplitude spectrum envelope coefficient from the line
- * spectrum pairs.
- *
- * @param lsp a vector of the cosinus 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(TwinContext *tctx, const float *cos_vals, float *lpc)
-{
- int i;
- const ModeTab *mtab = tctx->mtab;
- int size_s = mtab->size / mtab->fmode[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 cosinus of the LSP data
- * @param part is 0 for 0...PI (positive cossinus values) and 1 for PI...2PI
- (negative cossinus values)
- * @param size the size of the whole output
- */
-static inline void eval_lpcenv_or_interp(TwinContext *tctx,
- enum FrameType ftype,
- float *out, const float *in,
- int size, int step, int part)
-{
- int i;
- const ModeTab *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(TwinContext *tctx, enum FrameType 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);
-
- 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
@@ -403,12 +164,6 @@ static void dequant(TwinContext *tctx, GetBitContext *gb,
float *out,
}
-static inline float mulawinv(float y, float clip, float mu)
-{
- y = av_clipf(y/clip, -1, 1);
- return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu;
-}
-
/**
* Evaluate a*b/400 rounded to the nearest integer. When, for example,
* a*b == 200 and the nearest integer is ill-defined, use a table to emulate
@@ -529,171 +284,6 @@ static void dec_gain(TwinContext *tctx, GetBitContext
*gb, enum FrameType ftype,
}
}
-/**
- * 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(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
- int lpc_hist_idx, float *lsp, float *hist)
-{
- const ModeTab *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. - 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(TwinContext *tctx, float *lsp,
- enum FrameType 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 FT_LONG:
- eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
- break;
- case FT_MEDIUM:
- eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
- break;
- case FT_SHORT:
- eval_lpcenv(tctx, lsp, lpc);
- break;
- }
-}
-
-static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int
wtype,
- float *in, float *prev, int ch)
-{
- FFTContext *mdct = &tctx->mdct_ctx[ftype];
- const ModeTab *mtab = tctx->mtab;
- int bsize = mtab->size / mtab->fmode[ftype].sub;
- int size = mtab->size;
- float *buf1 = tctx->tmp_buf;
- int j;
- int wsize; // Window size
- float *out = tctx->curr_frame + 2*ch*mtab->size;
- float *out2 = out;
- float *prev_buf;
- int first_wsize;
-
- static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1};
- int types_sizes[] = {
- mtab->size / mtab->fmode[FT_LONG ].sub,
- mtab->size / mtab->fmode[FT_MEDIUM].sub,
- mtab->size / (2*mtab->fmode[FT_SHORT ].sub),
- };
-
- 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 == 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 == 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(TwinContext *tctx, enum FrameType ftype, int wtype,
- float **out)
-{
- const ModeTab *mtab = tctx->mtab;
- int size1, size2;
- float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
- int i;
-
- 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;
-
- memcpy(&out[0][0 ], prev_buf, size1 * sizeof(out[0][0]));
- memcpy(&out[0][size1], tctx->curr_frame, size2 * sizeof(out[0][0]));
-
- if (tctx->avctx->channels == 2) {
- memcpy(&out[1][0], &prev_buf[2*mtab->size], size1 *
sizeof(out[1][0]));
- memcpy(&out[1][size1], &tctx->curr_frame[2*mtab->size], size2 *
sizeof(out[1][0]));
- tctx->fdsp.butterflies_float(out[0], out[1], mtab->size);
- }
-}
-
static void dec_bark_env(TwinContext *tctx, const uint8_t *in, int use_hist,
int ch, float *out, float gain, enum FrameType ftype)
{
@@ -794,10 +384,10 @@ static void read_and_decode_spectrum(TwinContext *tctx,
GetBitContext *gb,
chunk);
}
- decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i], lsp,
- tctx->lsp_hist[i]);
+ twinvq_decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i],
+ lsp, tctx->lsp_hist[i]);
- dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
+ twinvq_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);
@@ -852,7 +442,7 @@ static int twin_decode_frame(AVCodecContext * avctx, void
*data,
read_and_decode_spectrum(tctx, &gb, tctx->spectrum, ftype);
- imdct_output(tctx, ftype, window_type, out);
+ twinvq_imdct_output(tctx, ftype, window_type, out);
FFSWAP(float*, tctx->curr_frame, tctx->prev_frame);
@@ -867,240 +457,6 @@ static int twin_decode_frame(AVCodecContext * avctx, void
*data,
return buf_size;
}
-/**
- * Init IMDCT and windowing tables
- */
-static av_cold int init_mdct_win(TwinContext *tctx)
-{
- int i, j, ret;
- const ModeTab *mtab = tctx->mtab;
- int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
- int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub;
- int channels = tctx->avctx->channels;
- float norm = channels == 1 ? 2. : 1.;
-
- 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 FrameType ftype)
-
-{
- int i,j;
-
- for (i = 0; i < line_len[0]; i++) {
- int shift;
-
- if (num_blocks == 1 ||
- (ftype == FT_LONG && num_vect % num_blocks) ||
- (ftype != FT_LONG && num_vect & 1 ) ||
- i == line_len[1]) {
- shift = 0;
- } else if (ftype == 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(TwinContext *tctx,enum FrameType
ftype)
-{
- int block_size;
- const ModeTab *mtab = tctx->mtab;
- int size;
- int16_t *tmp_perm = (int16_t *) tctx->tmp_buf;
-
- if (ftype == 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(TwinContext *tctx)
-{
- const ModeTab *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];
- int bse_bits[3];
- int i;
- enum FrameType 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 +
- WINDOW_TYPE_BITS + n_ch*GAIN_BITS;
-
- for (i = 0; i < 2; i++)
- bsize_no_main_cb[i] =
- lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS +
- mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS);
-
- // The remaining bits are all used for the main spectrum coefficients
- for (i = 0; i < 4; i++) {
- int bit_size;
- int 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 = FT_SHORT; frametype <= FT_PPC; frametype++)
- construct_perm_table(tctx, frametype);
-}
-
-static av_cold int twin_decode_close(AVCodecContext *avctx)
-{
- TwinContext *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;
-}
-
static av_cold int twin_decode_init(AVCodecContext *avctx)
{
int ret;
@@ -1155,12 +511,12 @@ static av_cold int twin_decode_init(AVCodecContext
*avctx)
}
avpriv_float_dsp_init(&tctx->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
- if ((ret = init_mdct_win(tctx))) {
+ if ((ret = twinvq_init_mdct_win(tctx))) {
av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
- twin_decode_close(avctx);
+ twinvq_decode_close(avctx);
return ret;
}
- init_bitstream_params(tctx);
+ twinvq_init_bitstream_params(tctx, 0);
memset_float(tctx->bark_hist[0][0], 0.1, FF_ARRAY_ELEMS(tctx->bark_hist));
@@ -1173,7 +529,7 @@ AVCodec ff_twinvq_decoder = {
.id = AV_CODEC_ID_TWINVQ,
.priv_data_size = sizeof(TwinContext),
.init = twin_decode_init,
- .close = twin_decode_close,
+ .close = twinvq_decode_close,
.decode = twin_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
diff --git a/libavcodec/twinvq_common.c b/libavcodec/twinvq_common.c
new file mode 100644
index 0000000..4137c59
--- /dev/null
+++ b/libavcodec/twinvq_common.c
@@ -0,0 +1,562 @@
+/*
+ * TwinVQ decoder
+ * Copyright (c) 2009 Vitor Sessak
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/float_dsp.h"
+#include "avcodec.h"
+#include "fft.h"
+#include "lsp.h"
+#include "sinewin.h"
+
+#include <math.h>
+#include <stdint.h>
+
+#include "twinvq_common.h"
+
+/**
+ * Evaluate a single LPC amplitude spectrum envelope coefficient from the line
+ * spectrum pairs.
+ *
+ * @param lsp a vector of the cosinus 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(TwinContext *tctx, const float *cos_vals, float *lpc)
+{
+ int i;
+ const ModeTab *mtab = tctx->mtab;
+ int size_s = mtab->size / mtab->fmode[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 cosinus of the LSP data
+ * @param part is 0 for 0...PI (positive cossinus values) and 1 for PI...2PI
+ (negative cossinus values)
+ * @param size the size of the whole output
+ */
+static inline void eval_lpcenv_or_interp(TwinContext *tctx,
+ enum FrameType ftype,
+ float *out, const float *in,
+ int size, int step, int part)
+{
+ int i;
+ const ModeTab *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(TwinContext *tctx, enum FrameType 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);
+
+ memset_float(lpc + size - 2*step + 1, lpc[size - 2*step], 2*step - 1);
+}
+
+/**
+ * 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;
+ }
+}
+
+void twinvq_decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
+ int lpc_hist_idx, float *lsp, float *hist)
+{
+ const ModeTab *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. - 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);
+}
+
+void twinvq_dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp,
+ enum FrameType 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 FT_LONG:
+ eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
+ break;
+ case FT_MEDIUM:
+ eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
+ break;
+ case FT_SHORT:
+ eval_lpcenv(tctx, lsp, lpc);
+ break;
+ }
+}
+
+static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int
wtype,
+ float *in, float *prev, int ch)
+{
+ FFTContext *mdct = &tctx->mdct_ctx[ftype];
+ const ModeTab *mtab = tctx->mtab;
+ int bsize = mtab->size / mtab->fmode[ftype].sub;
+ int size = mtab->size;
+ float *buf1 = tctx->tmp_buf;
+ int j;
+ int wsize; // Window size
+ float *out = tctx->curr_frame + 2*ch*mtab->size;
+ float *out2 = out;
+ float *prev_buf;
+ int first_wsize;
+
+ static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1};
+ int types_sizes[] = {
+ mtab->size / mtab->fmode[FT_LONG ].sub,
+ mtab->size / mtab->fmode[FT_MEDIUM].sub,
+ mtab->size / (2*mtab->fmode[FT_SHORT ].sub),
+ };
+
+ 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 == 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 == FT_MEDIUM ? (bsize-wsize)/2 : bsize - wsize;
+
+ prev_buf = buf1 + bsize*j + bsize/2;
+ }
+
+ tctx->last_block_pos[ch] = (size + first_wsize)/2;
+}
+
+void twinvq_imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype,
+ float **out)
+{
+ const ModeTab *mtab = tctx->mtab;
+ int size1, size2;
+ float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
+ int i;
+
+ 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;
+
+ memcpy(&out[0][0 ], prev_buf, size1 * sizeof(out[0][0]));
+ memcpy(&out[0][size1], tctx->curr_frame, size2 * sizeof(out[0][0]));
+
+ if (tctx->avctx->channels == 2) {
+ memcpy(&out[1][0], &prev_buf[2*mtab->size], size1 *
sizeof(out[1][0]));
+ memcpy(&out[1][size1], &tctx->curr_frame[2*mtab->size], size2 *
sizeof(out[1][0]));
+ tctx->fdsp.butterflies_float(out[0], out[1], mtab->size);
+ }
+}
+
+/**
+ * Init IMDCT and windowing tables
+ */
+av_cold int twinvq_init_mdct_win(TwinContext *tctx)
+{
+ int i, j, ret;
+ const ModeTab *mtab = tctx->mtab;
+ int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
+ int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub;
+ int channels = tctx->avctx->channels;
+ float norm = channels == 1 ? 2. : 1.;
+
+ 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 FrameType ftype)
+
+{
+ int i,j;
+
+ for (i = 0; i < line_len[0]; i++) {
+ int shift;
+
+ if (num_blocks == 1 ||
+ (ftype == FT_LONG && num_vect % num_blocks) ||
+ (ftype != FT_LONG && num_vect & 1 ) ||
+ i == line_len[1]) {
+ shift = 0;
+ } else if (ftype == 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(TwinContext *tctx,enum FrameType
ftype)
+{
+ int block_size;
+ const ModeTab *mtab = tctx->mtab;
+ int size;
+ int16_t *tmp_perm = (int16_t *) tctx->tmp_buf;
+
+ if (ftype == 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);
+}
+
+av_cold void twinvq_init_bitstream_params(TwinContext *tctx, int is_metasound)
+{
+ const ModeTab *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];
+ int bse_bits[3];
+ int i;
+ enum FrameType 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 +
+ WINDOW_TYPE_BITS + n_ch*GAIN_BITS;
+
+ for (i = 0; i < 2; i++)
+ bsize_no_main_cb[i] =
+ lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS +
+ mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS);
+
+ if (is_metasound) {
+ 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;
+ int 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 = FT_SHORT; frametype <= FT_PPC; frametype++)
+ construct_perm_table(tctx, frametype);
+}
+
+av_cold int twinvq_decode_close(AVCodecContext *avctx)
+{
+ TwinContext *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;
+}
diff --git a/libavcodec/twinvq_common.h b/libavcodec/twinvq_common.h
new file mode 100644
index 0000000..95732ce
--- /dev/null
+++ b/libavcodec/twinvq_common.h
@@ -0,0 +1,160 @@
+/*
+ * TwinVQ decoder
+ * Copyright (c) 2009 Vitor Sessak
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_TWINVQ_COMMON_H
+#define AVCODEC_TWINVQ_COMMON_H
+
+#include <math.h>
+#include <stdint.h>
+#include "libavutil/common.h"
+#include "libavutil/float_dsp.h"
+#include "avcodec.h"
+#include "fft.h"
+
+#define PPC_SHAPE_CB_SIZE 64
+#define PPC_SHAPE_LEN_MAX 60
+#define SUB_AMP_MAX 4500.0
+#define MULAW_MU 100.0
+#define GAIN_BITS 8
+#define AMP_MAX 13000.0
+#define SUB_GAIN_BITS 5
+#define WINDOW_TYPE_BITS 4
+#define PGAIN_MU 200
+#define LSP_COEFS_MAX 20
+#define LSP_SPLIT_MAX 4
+#define CHANNELS_MAX 2
+#define SUBBLOCKS_MAX 16
+#define BARK_N_COEF_MAX 4
+
+enum FrameType {
+ FT_SHORT = 0, ///< Short frame (divided in n sub-blocks)
+ FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks)
+ FT_LONG, ///< Long frame (single sub-block + PPC)
+ FT_PPC, ///< Periodic Peak Component (part of the long frame)
+};
+
+/**
+ * Parameters and tables that are different for each frame type
+ */
+struct FrameMode {
+ uint8_t sub; ///< Number subblocks in each frame
+ const uint16_t *bark_tab;
+
+ /** number of distinct bark scale envelope values */
+ uint8_t bark_env_size;
+
+ const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE)
+ uint8_t bark_n_coef;///< number of BSE CB coefficients to read
+ uint8_t bark_n_bit; ///< number of bits of the BSE coefs
+
+ //@{
+ /** main codebooks for spectrum data */
+ const int16_t *cb0;
+ const int16_t *cb1;
+ //@}
+
+ uint8_t cb_len_read; ///< number of spectrum coefficients to read
+};
+
+/**
+ * Parameters and tables that are different for every combination of
+ * bitrate/sample rate
+ */
+typedef struct {
+ struct FrameMode fmode[3]; ///< frame type-dependant parameters
+
+ uint16_t size; ///< frame size in samples
+ uint8_t n_lsp; ///< number of lsp coefficients
+ const float *lspcodebook;
+
+ /* number of bits of the different LSP CB coefficients */
+ uint8_t lsp_bit0;
+ uint8_t lsp_bit1;
+ uint8_t lsp_bit2;
+
+ uint8_t lsp_split; ///< number of CB entries for the LSP decoding
+ const int16_t *ppc_shape_cb; ///< PPC shape CB
+
+ /** number of the bits for the PPC period value */
+ uint8_t ppc_period_bit;
+
+ uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs
+ uint8_t ppc_shape_len; ///< size of PPC shape CB
+ uint8_t pgain_bit; ///< bits for PPC gain
+
+ /** constant for peak period to peak width conversion */
+ uint16_t peak_per2wid;
+} ModeTab;
+
+typedef struct TwinContext {
+ AVCodecContext *avctx;
+ AVFloatDSPContext fdsp;
+ FFTContext mdct_ctx[3];
+
+ const ModeTab *mtab;
+
+ // history
+ float lsp_hist[2][20]; ///< LSP coefficients of the last frame
+ float bark_hist[3][2][40]; ///< BSE coefficients of last frame
+
+ // bitstream parameters
+ int16_t permut[4][4096];
+ uint8_t length[4][2]; ///< main codebook stride
+ uint8_t length_change[4];
+ uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook
+ int bits_main_spec_change[4];
+ int n_div[4];
+
+ float *spectrum;
+ float *curr_frame; ///< non-interleaved output
+ float *prev_frame; ///< non-interleaved previous frame
+ int last_block_pos[2];
+ int discarded_packets;
+
+ float *cos_tabs[3];
+
+ // scratch buffers
+ float *tmp_buf;
+} TwinContext;
+
+static inline float mulawinv(float y, float clip, float mu)
+{
+ y = av_clipf(y/clip, -1, 1);
+ return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu;
+}
+
+static inline void memset_float(float *buf, float val, int size)
+{
+ while (size--)
+ *buf++ = val;
+}
+
+void twinvq_decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
+ int lpc_hist_idx, float *lsp, float *hist);
+void twinvq_dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp,
+ enum FrameType ftype, float *lpc);
+void twinvq_imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype,
+ float **out);
+av_cold int twinvq_init_mdct_win(TwinContext *tctx);
+av_cold void twinvq_init_bitstream_params(TwinContext *tctx, int is_metasound);
+av_cold int twinvq_decode_close(AVCodecContext *avctx);
+
+#endif /* AVCODEC_TWINVQ_COMMON_H */
--
1.7.9.5
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