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ac3enc: store per-block/channel bap pointers by reference block in a 2D array

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rather than in the AC3Block struct.

This will make it easier to access the bap values without having to chase
the reference block pointers each time.
pull/2/head
Justin Ruggles 14 years ago
parent e01e05ee66
commit 7743865ffc
1 changed files with 25 additions and 27 deletions
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  1. 52
      libavcodec/ac3enc.c

52
libavcodec/ac3enc.c
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@ -107,7 +107,6 @@ typedef struct AC3EncOptions {
* Data for a single audio block.
*/
typedef struct AC3Block {
uint8_t **bap; ///< bit allocation pointers (bap)
CoefType **mdct_coef; ///< MDCT coefficients
int32_t **fixed_coef; ///< fixed-point MDCT coefficients
uint8_t **exp; ///< original exponents
@ -122,7 +121,6 @@ typedef struct AC3Block {
uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
int num_rematrixing_bands; ///< number of rematrixing bands
uint8_t rematrixing_flags[4]; ///< rematrixing flags
struct AC3Block *exp_ref_block[AC3_MAX_CHANNELS]; ///< reference blocks for EXP_REUSE
int new_cpl_strategy; ///< send new coupling strategy
int cpl_in_use; ///< coupling in use for this block (cplinu)
uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
@ -219,6 +217,9 @@ typedef struct AC3EncodeContext {
uint8_t *cpl_coord_mant_buffer;
uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
int ref_bap_set; ///< indicates if ref_bap pointers have been set
DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
} AC3EncodeContext;
@ -1073,10 +1074,10 @@ static void encode_exponents(AC3EncodeContext *s)
blk1 = blk + 1;
/* count the number of EXP_REUSE blocks after the current block
and set exponent reference block pointers */
block->exp_ref_block[ch] = block;
and set exponent reference block numbers */
s->exp_ref_block[ch][blk] = blk;
while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE) {
s->blocks[blk1].exp_ref_block[ch] = block;
s->exp_ref_block[ch][blk1] = blk;
blk1++;
}
num_reuse_blocks = blk1 - blk - 1;
@ -1091,6 +1092,9 @@ static void encode_exponents(AC3EncodeContext *s)
blk = blk1;
}
}
/* reference block numbers have been changed, so reset ref_bap_set */
s->ref_bap_set = 0;
}
@ -1472,14 +1476,18 @@ static void bit_alloc_masking(AC3EncodeContext *s)
static void reset_block_bap(AC3EncodeContext *s)
{
int blk, ch;
int channels = s->channels + 1;
if (s->blocks[0].bap[0] == s->bap_buffer)
uint8_t *ref_bap;
if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
return;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
for (ch = 0; ch < channels; ch++) {
s->blocks[blk].bap[ch] = &s->bap_buffer[AC3_MAX_COEFS * (blk * channels + ch)];
}
ref_bap = s->bap_buffer;
for (ch = 0; ch <= s->channels; ch++) {
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
ref_bap += AC3_MAX_COEFS * AC3_MAX_BLOCKS;
}
s->ref_bap_set = 1;
}
@ -1502,7 +1510,6 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
mantissa_bits = 0;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
AC3Block *ref_block;
int av_uninit(ch0);
int got_cpl = !block->cpl_in_use;
// initialize grouped mantissa counts. these are set so that they are
@ -1522,15 +1529,14 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
blocks within a frame are the exponent values. We can take
advantage of that by reusing the bit allocation pointers
whenever we reuse exponents. */
ref_block = block->exp_ref_block[ch];
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
s->ac3dsp.bit_alloc_calc_bap(ref_block->mask[ch], ref_block->psd[ch],
s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
s->start_freq[ch], block->end_freq[ch],
snr_offset, s->bit_alloc.floor,
ff_ac3_bap_tab, ref_block->bap[ch]);
ff_ac3_bap_tab, s->ref_bap[ch][blk]);
}
mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt,
ref_block->bap[ch]+s->start_freq[ch],
s->ref_bap[ch][blk]+s->start_freq[ch],
block->end_freq[ch]-s->start_freq[ch]);
if (ch == CPL_CH)
ch = ch0;
@ -1812,7 +1818,6 @@ static void quantize_mantissas(AC3EncodeContext *s)
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
AC3Block *ref_block;
AC3Mant m = { 0 };
got_cpl = !block->cpl_in_use;
@ -1822,10 +1827,9 @@ static void quantize_mantissas(AC3EncodeContext *s)
ch = CPL_CH;
got_cpl = 1;
}
ref_block = block->exp_ref_block[ch];
quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
ref_block->exp[ch],
ref_block->bap[ch], block->qmant[ch],
s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
s->ref_bap[ch][blk], block->qmant[ch],
s->start_freq[ch], block->end_freq[ch]);
if (ch == CPL_CH)
ch = ch0;
@ -2130,17 +2134,15 @@ static void output_audio_block(AC3EncodeContext *s, int blk)
got_cpl = !block->cpl_in_use;
for (ch = 1; ch <= s->channels; ch++) {
int b, q;
AC3Block *ref_block;
if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
ch0 = ch - 1;
ch = CPL_CH;
got_cpl = 1;
}
ref_block = block->exp_ref_block[ch];
for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
q = block->qmant[ch][i];
b = ref_block->bap[ch][i];
b = s->ref_bap[ch][blk][i];
switch (b) {
case 0: break;
case 1: if (q != 128) put_bits(&s->pb, 5, q); break;
@ -2597,7 +2599,6 @@ static av_cold int ac3_encode_close(AVCodecContext *avctx)
av_freep(&s->qmant_buffer);
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
av_freep(&block->bap);
av_freep(&block->mdct_coef);
av_freep(&block->fixed_coef);
av_freep(&block->exp);
@ -2896,8 +2897,6 @@ static av_cold int allocate_buffers(AVCodecContext *avctx)
}
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
FF_ALLOC_OR_GOTO(avctx, block->bap, channels * sizeof(*block->bap),
alloc_fail);
FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef),
alloc_fail);
FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp),
@ -2921,7 +2920,6 @@ static av_cold int allocate_buffers(AVCodecContext *avctx)
for (ch = 0; ch < channels; ch++) {
/* arrangement: block, channel, coeff */
block->bap[ch] = &s->bap_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];

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