31 if (!num_reuse_blocks)
34 for (i = 0; i < nb_coefs; i++) {
37 for (blk = 0; blk < num_reuse_blocks; blk++) {
39 if (next_exp < min_exp)
50 for (i = 0; i <
len; i++)
58 uint32_t *src32 = (uint32_t *)src;
59 const uint32_t
mask = ~(((1 << shift) - 1) << 16);
62 for (i = 0; i <
len; i += 8) {
63 src32[i ] = (src32[i ] << shift) & mask;
64 src32[i+1] = (src32[i+1] << shift) & mask;
65 src32[i+2] = (src32[i+2] << shift) & mask;
66 src32[i+3] = (src32[i+3] << shift) & mask;
67 src32[i+4] = (src32[i+4] << shift) & mask;
68 src32[i+5] = (src32[i+5] << shift) & mask;
69 src32[i+6] = (src32[i+6] << shift) & mask;
70 src32[i+7] = (src32[i+7] << shift) & mask;
92 const float scale = 1 << 24;
94 *dst++ =
lrintf(*src++ * scale);
95 *dst++ =
lrintf(*src++ * scale);
96 *dst++ =
lrintf(*src++ * scale);
97 *dst++ =
lrintf(*src++ * scale);
98 *dst++ =
lrintf(*src++ * scale);
99 *dst++ =
lrintf(*src++ * scale);
100 *dst++ =
lrintf(*src++ * scale);
101 *dst++ =
lrintf(*src++ * scale);
108 int snr_offset,
int floor,
111 int bin, band, band_end;
114 if (snr_offset == -960) {
122 int m = (
FFMAX(mask[band] - snr_offset - floor, 0) & 0x1FE0) + floor;
124 band_end =
FFMIN(band_end, end);
126 for (; bin < band_end; bin++) {
127 int address = av_clip((psd[bin] - m) >> 5, 0, 63);
128 bap[bin] = bap_tab[address];
130 }
while (end > band_end);
137 mant_cnt[bap[
len]]++;
141 0, 0, 0, 3, 0, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16
151 bits += (mant_cnt[
blk][1] / 3) * 5;
154 bits += ((mant_cnt[
blk][2] / 3) + (mant_cnt[blk][4] >> 1)) * 7;
156 bits += mant_cnt[
blk][3] * 3;
158 for (bap = 5; bap < 16; bap++)
168 for (i = 0; i < nb_coefs; i++) {
169 int v = abs(coef[i]);
170 exp[i] = v ? 23 -
av_log2(v) : 24;
175 int out_ch,
int in_ch,
int len)
180 for (i = 0; i <
len; i++) {
182 for (j = 0; j < in_ch; j++) {
183 v0 += samples[j][i] * matrix[j][0];
184 v1 += samples[j][i] * matrix[j][1];
189 }
else if (out_ch == 1) {
190 for (i = 0; i <
len; i++) {
192 for (j = 0; j < in_ch; j++)
193 v0 += samples[j][i] * matrix[j][0];
void(* ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift)
Right-shift each value in an array of int32_t by a specified amount.
void(* float_to_fixed24)(int32_t *dst, const float *src, unsigned int len)
Convert an array of float in range [-1.0,1.0] to int32_t with range [-(1<<24),(1<<24)].
uint8_t ff_ac3_bin_to_band_tab[253]
static int ac3_max_msb_abs_int16_c(const int16_t *src, int len)
int(* ac3_max_msb_abs_int16)(const int16_t *src, int len)
Calculate the maximum MSB of the absolute value of each element in an array of int16_t.
void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
static const uint16_t mask[17]
const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1]
Starting frequency coefficient bin for each critical band.
simple assert() macros that are a bit more flexible than ISO C assert().
static int ac3_compute_mantissa_size_c(uint16_t mant_cnt[6][16])
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
static void ac3_downmix_c(float **samples, float(*matrix)[2], int out_ch, int in_ch, int len)
static av_always_inline av_const long int lrintf(float x)
void(* extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs)
void(* bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end, int snr_offset, int floor, const uint8_t *bap_tab, uint8_t *bap)
Calculate bit allocation pointers.
static void ac3_update_bap_counts_c(uint16_t mant_cnt[16], uint8_t *bap, int len)
static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
static void ac3_rshift_int32_c(int32_t *src, unsigned int len, unsigned int shift)
static void ac3_extract_exponents_c(uint8_t *exp, int32_t *coef, int nb_coefs)
int(* compute_mantissa_size)(uint16_t mant_cnt[6][16])
Calculate the number of bits needed to encode a set of mantissas.
static const uint16_t scale[4]
#define DECLARE_ALIGNED(n, t, v)
void(* update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len)
Update bap counts using the supplied array of bap.
const uint16_t ff_ac3_bap_bits[16]
Number of mantissa bits written for each bap value.
void(* ac3_lshift_int16)(int16_t *src, unsigned int len, unsigned int shift)
Left-shift each value in an array of int16_t by a specified amount.
void(* ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
Set each encoded exponent in a block to the minimum of itself and the exponents in the same frequency...
static void float_to_fixed24_c(int32_t *dst, const float *src, unsigned int len)
void(* downmix)(float **samples, float(*matrix)[2], 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_lshift_int16_c(int16_t *src, unsigned int len, unsigned int shift)
Common code between the AC-3 encoder and decoder.