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Code Issues Releases Activity

Move large arrays to AC3EncodeContext rather than passing them around.

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Originally committed as revision 26012 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-14 22:45:31 +00:00
parent 7da4dc17d9
commit 266d24be4a
1 changed files with 106 additions and 158 deletions
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264
libavcodec/ac3enc.c
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@ -101,6 +101,21 @@ typedef struct AC3EncodeContext {
uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
int16_t last_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< last 256 samples from previous frame
int16_t planar_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE+AC3_FRAME_SIZE];
int16_t windowed_samples[AC3_WINDOW_SIZE];
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint8_t grouped_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS];
int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int16_t band_psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS];
int16_t mask[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS];
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t bap1[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint16_t qmant[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
} AC3EncodeContext;
@ -132,8 +147,7 @@ static void adjust_frame_size(AC3EncodeContext *s)
* Channels are reordered from FFmpeg's default order to AC-3 order.
*/
static void deinterleave_input_samples(AC3EncodeContext *s,
const int16_t *samples,
int16_t planar_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE+AC3_FRAME_SIZE])
const int16_t *samples)
{
int ch, i;
@ -143,20 +157,20 @@ static void deinterleave_input_samples(AC3EncodeContext *s,
int sinc;
/* copy last 256 samples of previous frame to the start of the current frame */
memcpy(&planar_samples[ch][0], s->last_samples[ch],
AC3_BLOCK_SIZE * sizeof(planar_samples[0][0]));
memcpy(&s->planar_samples[ch][0], s->last_samples[ch],
AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));
/* deinterleave */
sinc = s->channels;
sptr = samples + s->channel_map[ch];
for (i = AC3_BLOCK_SIZE; i < AC3_FRAME_SIZE+AC3_BLOCK_SIZE; i++) {
planar_samples[ch][i] = *sptr;
s->planar_samples[ch][i] = *sptr;
sptr += sinc;
}
/* save last 256 samples for next frame */
memcpy(s->last_samples[ch], &planar_samples[ch][6* AC3_BLOCK_SIZE],
AC3_BLOCK_SIZE * sizeof(planar_samples[0][0]));
memcpy(s->last_samples[ch], &s->planar_samples[ch][6* AC3_BLOCK_SIZE],
AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));
}
}
@ -396,12 +410,11 @@ static void lshift_tab(int16_t *tab, int n, int lshift)
*
* @return exponent shift
*/
static int normalize_samples(AC3EncodeContext *s,
int16_t windowed_samples[AC3_WINDOW_SIZE])
static int normalize_samples(AC3EncodeContext *s)
{
int v = 14 - log2_tab(windowed_samples, AC3_WINDOW_SIZE);
int v = 14 - log2_tab(s->windowed_samples, AC3_WINDOW_SIZE);
v = FFMAX(0, v);
lshift_tab(windowed_samples, AC3_WINDOW_SIZE, v);
lshift_tab(s->windowed_samples, AC3_WINDOW_SIZE, v);
return v - 9;
}
@ -411,23 +424,19 @@ static int normalize_samples(AC3EncodeContext *s,
* This applies the KBD window and normalizes the input to reduce precision
* loss due to fixed-point calculations.
*/
static void apply_mdct(AC3EncodeContext *s,
int16_t planar_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE+AC3_FRAME_SIZE],
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
static void apply_mdct(AC3EncodeContext *s)
{
int blk, ch;
int16_t windowed_samples[AC3_WINDOW_SIZE];
for (ch = 0; ch < s->channels; ch++) {
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
const int16_t *input_samples = &planar_samples[ch][blk * AC3_BLOCK_SIZE];
const int16_t *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE];
apply_window(windowed_samples, input_samples, ff_ac3_window, AC3_WINDOW_SIZE);
apply_window(s->windowed_samples, input_samples, ff_ac3_window, AC3_WINDOW_SIZE);
exp_shift[blk][ch] = normalize_samples(s, windowed_samples);
s->exp_shift[blk][ch] = normalize_samples(s);
mdct512(mdct_coef[blk][ch], windowed_samples);
mdct512(s->mdct_coef[blk][ch], s->windowed_samples);
}
}
}
@ -438,10 +447,7 @@ static void apply_mdct(AC3EncodeContext *s,
* This takes into account the normalization that was done to the input samples
* by adjusting the exponents by the exponent shift values.
*/
static void extract_exponents(AC3EncodeContext *s,
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
static void extract_exponents(AC3EncodeContext *s)
{
int blk, ch, i;
@ -451,17 +457,17 @@ static void extract_exponents(AC3EncodeContext *s,
/* compute "exponents". We take into account the normalization there */
for (i = 0; i < AC3_MAX_COEFS; i++) {
int e;
int v = abs(mdct_coef[blk][ch][i]);
int v = abs(s->mdct_coef[blk][ch][i]);
if (v == 0)
e = 24;
else {
e = 23 - av_log2(v) + exp_shift[blk][ch];
e = 23 - av_log2(v) + s->exp_shift[blk][ch];
if (e >= 24) {
e = 24;
mdct_coef[blk][ch][i] = 0;
s->mdct_coef[blk][ch][i] = 0;
}
}
exp[blk][ch][i] = e;
s->exp[blk][ch][i] = e;
}
}
}
@ -529,9 +535,7 @@ static void compute_exp_strategy_ch(uint8_t *exp_strategy, uint8_t **exp)
* Calculate exponent strategies for all channels.
* Array arrangement is reversed to simplify the per-channel calculation.
*/
static void compute_exp_strategy(AC3EncodeContext *s,
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
static void compute_exp_strategy(AC3EncodeContext *s)
{
uint8_t *exp1[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS];
uint8_t exp_str1[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS];
@ -539,20 +543,20 @@ static void compute_exp_strategy(AC3EncodeContext *s,
for (ch = 0; ch < s->fbw_channels; ch++) {
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
exp1[ch][blk] = exp[blk][ch];
exp_str1[ch][blk] = exp_strategy[blk][ch];
exp1[ch][blk] = s->exp[blk][ch];
exp_str1[ch][blk] = s->exp_strategy[blk][ch];
}
compute_exp_strategy_ch(exp_str1[ch], exp1[ch]);
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
exp_strategy[blk][ch] = exp_str1[ch][blk];
s->exp_strategy[blk][ch] = exp_str1[ch][blk];
}
if (s->lfe_on) {
ch = s->lfe_channel;
exp_strategy[0][ch] = EXP_D15;
s->exp_strategy[0][ch] = EXP_D15;
for (blk = 1; blk < 5; blk++)
exp_strategy[blk][ch] = EXP_REUSE;
s->exp_strategy[blk][ch] = EXP_REUSE;
}
}
@ -629,11 +633,7 @@ static void encode_exponents_blk_ch(uint8_t encoded_exp[AC3_MAX_COEFS],
* deltas between adjacent exponent groups so that they can be differentially
* encoded.
*/
static void encode_exponents(AC3EncodeContext *s,
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
static void encode_exponents(AC3EncodeContext *s)
{
int blk, blk1, blk2, ch;
@ -642,17 +642,17 @@ static void encode_exponents(AC3EncodeContext *s,
blk = 0;
while (blk < AC3_MAX_BLOCKS) {
blk1 = blk + 1;
while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1][ch] == EXP_REUSE) {
exponent_min(exp[blk][ch], exp[blk1][ch], s->nb_coefs[ch]);
while (blk1 < AC3_MAX_BLOCKS && s->exp_strategy[blk1][ch] == EXP_REUSE) {
exponent_min(s->exp[blk][ch], s->exp[blk1][ch], s->nb_coefs[ch]);
blk1++;
}
encode_exponents_blk_ch(encoded_exp[blk][ch],
exp[blk][ch], s->nb_coefs[ch],
exp_strategy[blk][ch],
&num_exp_groups[blk][ch]);
encode_exponents_blk_ch(s->encoded_exp[blk][ch],
s->exp[blk][ch], s->nb_coefs[ch],
s->exp_strategy[blk][ch],
&s->num_exp_groups[blk][ch]);
/* copy encoded exponents for reuse case */
for (blk2 = blk+1; blk2 < blk1; blk2++) {
memcpy(encoded_exp[blk2][ch], encoded_exp[blk][ch],
memcpy(s->encoded_exp[blk2][ch], s->encoded_exp[blk][ch],
s->nb_coefs[ch] * sizeof(uint8_t));
}
blk = blk1;
@ -666,11 +666,7 @@ static void encode_exponents(AC3EncodeContext *s,
* 3 delta-encoded exponents are in each 7-bit group. The number of groups
* varies depending on exponent strategy and bandwidth.
*/
static void group_exponents(AC3EncodeContext *s,
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t grouped_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS])
static void group_exponents(AC3EncodeContext *s)
{
int blk, ch, i;
int group_size, bit_count;
@ -681,20 +677,20 @@ static void group_exponents(AC3EncodeContext *s,
bit_count = 0;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
for (ch = 0; ch < s->channels; ch++) {
if (exp_strategy[blk][ch] == EXP_REUSE) {
num_exp_groups[blk][ch] = 0;
if (s->exp_strategy[blk][ch] == EXP_REUSE) {
s->num_exp_groups[blk][ch] = 0;
continue;
}
group_size = exp_strategy[blk][ch] + (exp_strategy[blk][ch] == EXP_D45);
bit_count += 4 + (num_exp_groups[blk][ch] * 7);
p = encoded_exp[blk][ch];
group_size = s->exp_strategy[blk][ch] + (s->exp_strategy[blk][ch] == EXP_D45);
bit_count += 4 + (s->num_exp_groups[blk][ch] * 7);
p = s->encoded_exp[blk][ch];
/* DC exponent */
exp1 = *p++;
grouped_exp[blk][ch][0] = exp1;
s->grouped_exp[blk][ch][0] = exp1;
/* remaining exponents are delta encoded */
for (i = 1; i <= num_exp_groups[blk][ch]; i++) {
for (i = 1; i <= s->num_exp_groups[blk][ch]; i++) {
/* merge three delta in one code */
exp0 = exp1;
exp1 = p[0];
@ -711,7 +707,7 @@ static void group_exponents(AC3EncodeContext *s,
p += group_size;
delta2 = exp1 - exp0 + 2;
grouped_exp[blk][ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
s->grouped_exp[blk][ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
}
}
}
@ -725,22 +721,15 @@ static void group_exponents(AC3EncodeContext *s,
* Extract exponents from MDCT coefficients, calculate exponent strategies,
* and encode final exponents.
*/
static void process_exponents(AC3EncodeContext *s,
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t grouped_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS])
static void process_exponents(AC3EncodeContext *s)
{
extract_exponents(s, mdct_coef, exp_shift, exp);
extract_exponents(s);
compute_exp_strategy(s, exp_strategy, exp);
compute_exp_strategy(s);
encode_exponents(s, exp, exp_strategy, num_exp_groups, encoded_exp);
encode_exponents(s);
group_exponents(s, encoded_exp, exp_strategy, num_exp_groups, grouped_exp);
group_exponents(s);
}
@ -778,8 +767,7 @@ static void bit_alloc_init(AC3EncodeContext *s)
/**
* Count the bits used to encode the frame, minus exponents and mantissas.
*/
static void count_frame_bits(AC3EncodeContext *s,
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS])
static void count_frame_bits(AC3EncodeContext *s)
{
static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
int blk, ch;
@ -801,7 +789,7 @@ static void count_frame_bits(AC3EncodeContext *s,
if (s->lfe_on)
frame_bits++; /* lfeexpstr */
for (ch = 0; ch < s->fbw_channels; ch++) {
if (exp_strategy[blk][ch] != EXP_REUSE)
if (s->exp_strategy[blk][ch] != EXP_REUSE)
frame_bits += 6 + 2; /* chbwcod[6], gainrng[2] */
}
frame_bits++; /* baie */
@ -882,30 +870,25 @@ static int compute_mantissa_size(AC3EncodeContext *s, uint8_t *m, int nb_coefs)
* Calculate masking curve based on the final exponents.
* Also calculate the power spectral densities to use in future calculations.
*/
static void bit_alloc_masking(AC3EncodeContext *s,
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int16_t mask[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS])
static void bit_alloc_masking(AC3EncodeContext *s)
{
int blk, ch;
int16_t band_psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS];
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
for (ch = 0; ch < s->channels; ch++) {
if(exp_strategy[blk][ch] == EXP_REUSE) {
memcpy(psd[blk][ch], psd[blk-1][ch], AC3_MAX_COEFS*sizeof(psd[0][0][0]));
memcpy(mask[blk][ch], mask[blk-1][ch], AC3_CRITICAL_BANDS*sizeof(mask[0][0][0]));
if (s->exp_strategy[blk][ch] == EXP_REUSE) {
memcpy(s->psd[blk][ch], s->psd[blk-1][ch], AC3_MAX_COEFS*sizeof(s->psd[0][0][0]));
memcpy(s->mask[blk][ch], s->mask[blk-1][ch], AC3_CRITICAL_BANDS*sizeof(s->mask[0][0][0]));
} else {
ff_ac3_bit_alloc_calc_psd(encoded_exp[blk][ch], 0,
ff_ac3_bit_alloc_calc_psd(s->encoded_exp[blk][ch], 0,
s->nb_coefs[ch],
psd[blk][ch], band_psd[blk][ch]);
ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, band_psd[blk][ch],
s->psd[blk][ch], s->band_psd[blk][ch]);
ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, s->band_psd[blk][ch],
0, s->nb_coefs[ch],
ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
ch == s->lfe_channel,
DBA_NONE, 0, NULL, NULL, NULL,
mask[blk][ch]);
s->mask[blk][ch]);
}
}
}
@ -920,8 +903,6 @@ static void bit_alloc_masking(AC3EncodeContext *s,
* is used.
*/
static int bit_alloc(AC3EncodeContext *s,
int16_t mask[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS],
int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int snr_offset)
{
@ -936,7 +917,7 @@ static int bit_alloc(AC3EncodeContext *s,
s->mant2_cnt = 0;
s->mant4_cnt = 0;
for (ch = 0; ch < s->channels; ch++) {
ff_ac3_bit_alloc_calc_bap(mask[blk][ch], psd[blk][ch], 0,
ff_ac3_bit_alloc_calc_bap(s->mask[blk][ch], s->psd[blk][ch], 0,
s->nb_coefs[ch], snr_offset,
s->bit_alloc.floor, ff_ac3_bap_tab,
bap[blk][ch]);
@ -953,23 +934,17 @@ static int bit_alloc(AC3EncodeContext *s,
* frame size. Output is the SNR offset and a set of bit allocation pointers
* used to quantize the mantissas.
*/
static int compute_bit_allocation(AC3EncodeContext *s,
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS])
static int compute_bit_allocation(AC3EncodeContext *s)
{
int ch;
int bits_left;
int snr_offset;
uint8_t bap1[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int16_t mask[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS];
/* count frame bits other than exponents and mantissas */
count_frame_bits(s, exp_strategy);
count_frame_bits(s);
/* calculate psd and masking curve before doing bit allocation */
bit_alloc_masking(s, encoded_exp, exp_strategy, psd, mask);
bit_alloc_masking(s);
/* now the big work begins : do the bit allocation. Modify the snr
offset until we can pack everything in the requested frame size */
@ -979,7 +954,7 @@ static int compute_bit_allocation(AC3EncodeContext *s,
snr_offset = s->coarse_snr_offset << 4;
while (snr_offset >= 0 &&
bit_alloc(s, mask, psd, bap, snr_offset) > bits_left) {
bit_alloc(s, s->bap, snr_offset) > bits_left) {
snr_offset -= 64;
}
if (snr_offset < 0) {
@ -987,24 +962,24 @@ static int compute_bit_allocation(AC3EncodeContext *s,
}
while (snr_offset + 64 <= 1023 &&
bit_alloc(s, mask, psd, bap1, snr_offset + 64) <= bits_left) {
bit_alloc(s, s->bap1, snr_offset + 64) <= bits_left) {
snr_offset += 64;
memcpy(bap, bap1, sizeof(bap1));
memcpy(s->bap, s->bap1, sizeof(s->bap1));
}
while (snr_offset + 16 <= 1023 &&
bit_alloc(s, mask, psd, bap1, snr_offset + 16) <= bits_left) {
bit_alloc(s, s->bap1, snr_offset + 16) <= bits_left) {
snr_offset += 16;
memcpy(bap, bap1, sizeof(bap1));
memcpy(s->bap, s->bap1, sizeof(s->bap1));
}
while (snr_offset + 4 <= 1023 &&
bit_alloc(s, mask, psd, bap1, snr_offset + 4) <= bits_left) {
bit_alloc(s, s->bap1, snr_offset + 4) <= bits_left) {
snr_offset += 4;
memcpy(bap, bap1, sizeof(bap1));
memcpy(s->bap, s->bap1, sizeof(s->bap1));
}
while (snr_offset + 1 <= 1023 &&
bit_alloc(s, mask, psd, bap1, snr_offset + 1) <= bits_left) {
bit_alloc(s, s->bap1, snr_offset + 1) <= bits_left) {
snr_offset++;
memcpy(bap, bap1, sizeof(bap1));
memcpy(s->bap, s->bap1, sizeof(s->bap1));
}
s->coarse_snr_offset = snr_offset >> 4;
@ -1156,12 +1131,7 @@ static void quantize_mantissas_blk_ch(AC3EncodeContext *s,
/**
* Quantize mantissas using coefficients, exponents, and bit allocation pointers.
*/
static void quantize_mantissas(AC3EncodeContext *s,
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint16_t qmant[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
static void quantize_mantissas(AC3EncodeContext *s)
{
int blk, ch;
@ -1171,9 +1141,9 @@ static void quantize_mantissas(AC3EncodeContext *s,
s->qmant1_ptr = s->qmant2_ptr = s->qmant4_ptr = NULL;
for (ch = 0; ch < s->channels; ch++) {
quantize_mantissas_blk_ch(s, mdct_coef[blk][ch], exp_shift[blk][ch],
encoded_exp[blk][ch], bap[blk][ch],
qmant[blk][ch], s->nb_coefs[ch]);
quantize_mantissas_blk_ch(s, s->mdct_coef[blk][ch], s->exp_shift[blk][ch],
s->encoded_exp[blk][ch], s->bap[blk][ch],
s->qmant[blk][ch], s->nb_coefs[ch]);
}
}
}
@ -1214,11 +1184,6 @@ static void output_frame_header(AC3EncodeContext *s)
* Write one audio block to the output bitstream.
*/
static void output_audio_block(AC3EncodeContext *s,
uint8_t exp_strategy[AC3_MAX_CHANNELS],
uint8_t num_exp_groups[AC3_MAX_CHANNELS],
uint8_t grouped_exp[AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS],
uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint16_t qmant[AC3_MAX_CHANNELS][AC3_MAX_COEFS],
int block_num)
{
int ch, i, baie, rbnd;
@ -1251,28 +1216,28 @@ static void output_audio_block(AC3EncodeContext *s,
/* exponent strategy */
for (ch = 0; ch < s->fbw_channels; ch++)
put_bits(&s->pb, 2, exp_strategy[ch]);
put_bits(&s->pb, 2, s->exp_strategy[block_num][ch]);
if (s->lfe_on)
put_bits(&s->pb, 1, exp_strategy[s->lfe_channel]);
put_bits(&s->pb, 1, s->exp_strategy[block_num][s->lfe_channel]);
/* bandwidth */
for (ch = 0; ch < s->fbw_channels; ch++) {
if (exp_strategy[ch] != EXP_REUSE)
if (s->exp_strategy[block_num][ch] != EXP_REUSE)
put_bits(&s->pb, 6, s->bandwidth_code[ch]);
}
/* exponents */
for (ch = 0; ch < s->channels; ch++) {
if (exp_strategy[ch] == EXP_REUSE)
if (s->exp_strategy[block_num][ch] == EXP_REUSE)
continue;
/* first exponent */
put_bits(&s->pb, 4, grouped_exp[ch][0]);
put_bits(&s->pb, 4, s->grouped_exp[block_num][ch][0]);
/* next ones are delta-encoded and grouped */
for (i = 1; i <= num_exp_groups[ch]; i++)
put_bits(&s->pb, 7, grouped_exp[ch][i]);
for (i = 1; i <= s->num_exp_groups[block_num][ch]; i++)
put_bits(&s->pb, 7, s->grouped_exp[block_num][ch][i]);
if (ch != s->lfe_channel)
put_bits(&s->pb, 2, 0); /* no gain range info */
@ -1307,8 +1272,8 @@ static void output_audio_block(AC3EncodeContext *s,
int b, q;
for (i = 0; i < s->nb_coefs[ch]; i++) {
q = qmant[ch][i];
b = bap[ch][i];
q = s->qmant[block_num][ch][i];
b = s->bap[block_num][ch][i];
switch (b) {
case 0: break;
case 1: if (q != 128) put_bits(&s->pb, 5, q); break;
@ -1400,12 +1365,7 @@ static void output_frame_end(AC3EncodeContext *s)
* Write the frame to the output bitstream.
*/
static void output_frame(AC3EncodeContext *s,
unsigned char *frame,
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS],
uint8_t grouped_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS],
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],
uint16_t qmant[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS])
unsigned char *frame)
{
int blk;
@ -1414,8 +1374,7 @@ static void output_frame(AC3EncodeContext *s,
output_frame_header(s);
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
output_audio_block(s, exp_strategy[blk], num_exp_groups[blk],
grouped_exp[blk], bap[blk], qmant[blk], blk);
output_audio_block(s, blk);
}
output_frame_end(s);
@ -1430,37 +1389,26 @@ static int ac3_encode_frame(AVCodecContext *avctx,
{
AC3EncodeContext *s = avctx->priv_data;
const int16_t *samples = data;
int16_t planar_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE+AC3_FRAME_SIZE];
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
uint8_t num_exp_groups[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint8_t grouped_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_EXP_GROUPS];
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS];
uint16_t qmant[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];
int ret;
if (s->bit_alloc.sr_code == 1)
adjust_frame_size(s);
deinterleave_input_samples(s, samples, planar_samples);
deinterleave_input_samples(s, samples);
apply_mdct(s, planar_samples, exp_shift, mdct_coef);
apply_mdct(s);
process_exponents(s, mdct_coef, exp_shift, exp, exp_strategy, encoded_exp,
num_exp_groups, grouped_exp);
process_exponents(s);
ret = compute_bit_allocation(s, bap, encoded_exp, exp_strategy);
ret = compute_bit_allocation(s);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
return ret;
}
quantize_mantissas(s, mdct_coef, exp_shift, encoded_exp, bap, qmant);
quantize_mantissas(s);
output_frame(s, frame, exp_strategy, num_exp_groups, grouped_exp, bap, qmant);
output_frame(s, frame);
return s->frame_size;
}