33 if (!num_reuse_blocks)
36 for (
i = 0;
i < nb_coefs;
i++) {
39 for (
blk = 0;
blk < num_reuse_blocks;
blk++) {
41 if (next_exp < min_exp)
51 const float scale = 1 << 24;
67 int snr_offset,
int floor,
70 int bin, band, band_end;
73 if (snr_offset == -960) {
83 band_end =
FFMIN(band_end, end);
85 for (; bin < band_end; bin++) {
89 }
while (end > band_end);
100 0, 0, 0, 3, 0, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16
110 bits += (mant_cnt[
blk][1] / 3) * 5;
113 bits += ((mant_cnt[
blk][2] / 3) + (mant_cnt[
blk][4] >> 1)) * 7;
117 for (bap = 5; bap < 16; bap++)
127 for (
i = 0;
i < nb_coefs;
i++) {
128 int v =
abs(coef[
i]);
140 sum[0] = sum[1] = sum[2] = sum[3] = 0;
142 for (
i = 0;
i <
len;
i++) {
147 MAC64(sum[0], lt, lt);
148 MAC64(sum[1], rt, rt);
150 MAC64(sum[3], sd, sd);
161 sum[0] = sum[1] = sum[2] = sum[3] = 0;
163 for (
i = 0;
i <
len;
i++) {
180 float front_mix = matrix[0][0];
181 float center_mix = matrix[0][1];
182 float surround_mix = matrix[0][3];
184 for (
i = 0;
i <
len;
i++) {
185 v0 = samples[0][
i] * front_mix +
186 samples[1][
i] * center_mix +
187 samples[3][
i] * surround_mix;
189 v1 = samples[1][
i] * center_mix +
190 samples[2][
i] * front_mix +
191 samples[4][
i] * surround_mix;
202 float front_mix = matrix[0][0];
203 float center_mix = matrix[0][1];
204 float surround_mix = matrix[0][3];
206 for (
i = 0;
i <
len;
i++) {
207 samples[0][
i] = samples[0][
i] * front_mix +
208 samples[1][
i] * center_mix +
209 samples[2][
i] * front_mix +
210 samples[3][
i] * surround_mix +
211 samples[4][
i] * surround_mix;
216 int out_ch,
int in_ch,
int len)
222 for (
i = 0;
i <
len;
i++) {
224 for (j = 0; j < in_ch; j++) {
225 v0 += samples[j][
i] * matrix[0][j];
226 v1 += samples[j][
i] * matrix[1][j];
231 }
else if (out_ch == 1) {
232 for (
i = 0;
i <
len;
i++) {
234 for (j = 0; j < in_ch; j++)
235 v0 += samples[j][
i] * matrix[0][j];
246 int16_t front_mix = matrix[0][0];
247 int16_t center_mix = matrix[0][1];
248 int16_t surround_mix = matrix[0][3];
250 for (
i = 0;
i <
len;
i++) {
251 v0 = (int64_t)samples[0][
i] * front_mix +
252 (int64_t)samples[1][
i] * center_mix +
253 (int64_t)samples[3][
i] * surround_mix;
255 v1 = (int64_t)samples[1][
i] * center_mix +
256 (int64_t)samples[2][
i] * front_mix +
257 (int64_t)samples[4][
i] * surround_mix;
259 samples[0][
i] = (
v0+2048)>>12;
260 samples[1][
i] = (v1+2048)>>12;
269 int16_t front_mix = matrix[0][0];
270 int16_t center_mix = matrix[0][1];
271 int16_t surround_mix = matrix[0][3];
273 for (
i = 0;
i <
len;
i++) {
274 v0 = (int64_t)samples[0][
i] * front_mix +
275 (int64_t)samples[1][
i] * center_mix +
276 (int64_t)samples[2][
i] * front_mix +
277 (int64_t)samples[3][
i] * surround_mix +
278 (int64_t)samples[4][
i] * surround_mix;
280 samples[0][
i] = (
v0+2048)>>12;
285 int out_ch,
int in_ch,
int len)
290 for (
i = 0;
i <
len;
i++) {
292 for (j = 0; j < in_ch; j++) {
293 v0 += (int64_t)samples[j][
i] * matrix[0][j];
294 v1 += (int64_t)samples[j][
i] * matrix[1][j];
296 samples[0][
i] = (
v0+2048)>>12;
297 samples[1][
i] = (v1+2048)>>12;
299 }
else if (out_ch == 1) {
300 for (
i = 0;
i <
len;
i++) {
302 for (j = 0; j < in_ch; j++)
303 v0 += (int64_t)samples[j][
i] * matrix[0][j];
304 samples[0][
i] = (
v0+2048)>>12;
310 int out_ch,
int in_ch,
int len)
312 if (
c->in_channels != in_ch ||
c->out_channels != out_ch) {
313 c->in_channels = in_ch;
314 c->out_channels = out_ch;
315 c->downmix_fixed =
NULL;
317 if (in_ch == 5 && out_ch == 2 &&
318 !(matrix[1][0] | matrix[0][2] |
319 matrix[1][3] | matrix[0][4] |
320 (matrix[0][1] ^ matrix[1][1]) |
321 (matrix[0][0] ^ matrix[1][2]))) {
323 }
else if (in_ch == 5 && out_ch == 1 &&
324 matrix[0][0] == matrix[0][2] &&
325 matrix[0][3] == matrix[0][4]) {
330 if (
c->downmix_fixed)
331 c->downmix_fixed(samples, matrix,
len);
337 int out_ch,
int in_ch,
int len)
339 if (
c->in_channels != in_ch ||
c->out_channels != out_ch) {
340 int **matrix_cmp = (
int **)matrix;
342 c->in_channels = in_ch;
343 c->out_channels = out_ch;
346 if (in_ch == 5 && out_ch == 2 &&
347 !(matrix_cmp[1][0] | matrix_cmp[0][2] |
348 matrix_cmp[1][3] | matrix_cmp[0][4] |
349 (matrix_cmp[0][1] ^ matrix_cmp[1][1]) |
350 (matrix_cmp[0][0] ^ matrix_cmp[1][2]))) {
352 }
else if (in_ch == 5 && out_ch == 1 &&
353 matrix_cmp[0][0] == matrix_cmp[0][2] &&
354 matrix_cmp[0][3] == matrix_cmp[0][4]) {
363 c->downmix(samples, matrix,
len);
381 c->downmix_fixed =
NULL;
const uint8_t ff_ac3_bin_to_band_tab[253]
Map each frequency coefficient bin to the critical band that contains it.
const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1]
Starting frequency coefficient bin for each critical band.
Common code between the AC-3 encoder and decoder.
static void float_to_fixed24_c(int32_t *dst, const float *src, unsigned int len)
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
static void ac3_sum_square_butterfly_int32_c(int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
static void ac3_downmix_c_fixed(int32_t **samples, int16_t **matrix, int out_ch, int in_ch, int len)
static void ac3_bit_alloc_calc_bap_c(int16_t *mask, int16_t *psd, int start, int end, int snr_offset, int floor, const uint8_t *bap_tab, uint8_t *bap)
static void ac3_sum_square_butterfly_float_c(float sum[4], const float *coef0, const float *coef1, int len)
static void ac3_downmix_c(float **samples, float **matrix, int out_ch, int in_ch, int len)
static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
void ff_ac3dsp_downmix_fixed(AC3DSPContext *c, int32_t **samples, int16_t **matrix, int out_ch, int in_ch, int len)
static void ac3_extract_exponents_c(uint8_t *exp, int32_t *coef, int nb_coefs)
static void ac3_downmix_5_to_2_symmetric_c(float **samples, float **matrix, int len)
void ff_ac3dsp_downmix(AC3DSPContext *c, float **samples, float **matrix, int out_ch, int in_ch, int len)
static void ac3_update_bap_counts_c(uint16_t mant_cnt[16], uint8_t *bap, int len)
const uint16_t ff_ac3_bap_bits[16]
Number of mantissa bits written for each bap value.
static void ac3_downmix_5_to_1_symmetric_c_fixed(int32_t **samples, int16_t **matrix, int len)
static void ac3_downmix_5_to_1_symmetric_c(float **samples, float **matrix, int len)
static int ac3_compute_mantissa_size_c(uint16_t mant_cnt[6][16])
static void ac3_downmix_5_to_2_symmetric_c_fixed(int32_t **samples, int16_t **matrix, int len)
void ff_ac3dsp_set_downmix_x86(AC3DSPContext *c)
void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact)
void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
Libavcodec external API header.
static __device__ float floor(float a)
static const uint8_t bap_tab[64]
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
static const uint16_t mask[17]