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Code Issues Releases Activity

avcodec/ac3enc: Avoid indirections, allocations of small arrays

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-04-14 18:21:15 +02:00
parent 94132dc4aa
commit 79d1814b71
2 changed files with 15 additions and 51 deletions
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44
libavcodec/ac3enc.c
View File

@ -2180,13 +2180,10 @@ static void dprint_options(AC3EncodeContext *s)
*/
av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
{
int blk, ch;
AC3EncodeContext *s = avctx->priv_data;
if (s->planar_samples)
for (ch = 0; ch < s->channels; ch++)
av_freep(&s->planar_samples[ch]);
av_freep(&s->planar_samples);
for (int ch = 0; ch < s->channels; ch++)
av_freep(&s->planar_samples[ch]);
av_freep(&s->bap_buffer);
av_freep(&s->bap1_buffer);
av_freep(&s->mdct_coef_buffer);
@ -2200,19 +2197,6 @@ av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
av_freep(&s->cpl_coord_exp_buffer);
av_freep(&s->cpl_coord_mant_buffer);
av_freep(&s->fdsp);
for (blk = 0; blk < s->num_blocks; blk++) {
AC3Block *block = &s->blocks[blk];
av_freep(&block->mdct_coef);
av_freep(&block->fixed_coef);
av_freep(&block->exp);
av_freep(&block->grouped_exp);
av_freep(&block->psd);
av_freep(&block->band_psd);
av_freep(&block->mask);
av_freep(&block->qmant);
av_freep(&block->cpl_coord_exp);
av_freep(&block->cpl_coord_mant);
}
av_tx_uninit(&s->tx);
@ -2457,9 +2441,6 @@ static av_cold int allocate_buffers(AC3EncodeContext *s)
int total_coefs = AC3_MAX_COEFS * channel_blocks;
const unsigned sampletype_size = SAMPLETYPE_SIZE(s);
if (!FF_ALLOCZ_TYPED_ARRAY(s->planar_samples, s->channels))
return AVERROR(ENOMEM);
for (int ch = 0; ch < s->channels; ch++) {
s->planar_samples[ch] = av_mallocz((AC3_FRAME_SIZE + AC3_BLOCK_SIZE) *
sampletype_size);
@ -2486,21 +2467,6 @@ static av_cold int allocate_buffers(AC3EncodeContext *s)
for (blk = 0; blk < s->num_blocks; blk++) {
AC3Block *block = &s->blocks[blk];
if (!FF_ALLOCZ_TYPED_ARRAY(block->mdct_coef, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->exp, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->grouped_exp, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->psd, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->band_psd, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->mask, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->qmant, channels))
return AVERROR(ENOMEM);
if (s->cpl_enabled) {
if (!FF_ALLOCZ_TYPED_ARRAY(block->cpl_coord_exp, channels) ||
!FF_ALLOCZ_TYPED_ARRAY(block->cpl_coord_mant, channels))
return AVERROR(ENOMEM);
}
for (ch = 0; ch < channels; ch++) {
/* arrangement: block, channel, coeff */
block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
@ -2524,16 +2490,14 @@ static av_cold int allocate_buffers(AC3EncodeContext *s)
return AVERROR(ENOMEM);
for (blk = 0; blk < s->num_blocks; blk++) {
AC3Block *block = &s->blocks[blk];
if (!FF_ALLOCZ_TYPED_ARRAY(block->fixed_coef, channels))
return AVERROR(ENOMEM);
for (ch = 0; ch < channels; ch++)
block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
}
} else {
for (blk = 0; blk < s->num_blocks; blk++) {
AC3Block *block = &s->blocks[blk];
if (!FF_ALLOCZ_TYPED_ARRAY(block->fixed_coef, channels))
return AVERROR(ENOMEM);
for (ch = 0; ch < channels; ch++)
block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
}

22
libavcodec/ac3enc.h
View File

@ -127,16 +127,16 @@ typedef struct AC3EncOptions {
* Data for a single audio block.
*/
typedef struct AC3Block {
CoefType **mdct_coef; ///< MDCT coefficients
int32_t **fixed_coef; ///< fixed-point MDCT coefficients
uint8_t **exp; ///< original exponents
uint8_t **grouped_exp; ///< grouped exponents
int16_t **psd; ///< psd per frequency bin
int16_t **band_psd; ///< psd per critical band
int16_t **mask; ///< masking curve
uint16_t **qmant; ///< quantized mantissas
uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp)
uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant)
CoefType *mdct_coef[AC3_MAX_CHANNELS]; ///< MDCT coefficients
int32_t *fixed_coef[AC3_MAX_CHANNELS]; ///< fixed-point MDCT coefficients
uint8_t *exp[AC3_MAX_CHANNELS]; ///< original exponents
uint8_t *grouped_exp[AC3_MAX_CHANNELS]; ///< grouped exponents
int16_t *psd[AC3_MAX_CHANNELS]; ///< psd per frequency bin
int16_t *band_psd[AC3_MAX_CHANNELS]; ///< psd per critical band
int16_t *mask[AC3_MAX_CHANNELS]; ///< masking curve
uint16_t *qmant[AC3_MAX_CHANNELS]; ///< quantized mantissas
uint8_t *cpl_coord_exp[AC3_MAX_CHANNELS]; ///< coupling coord exponents (cplcoexp)
uint8_t *cpl_coord_mant[AC3_MAX_CHANNELS]; ///< coupling coord mantissas (cplcomant)
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
@ -232,7 +232,7 @@ typedef struct AC3EncodeContext {
int frame_bits; ///< all frame bits except exponents and mantissas
int exponent_bits; ///< number of bits used for exponents
uint8_t **planar_samples;
uint8_t *planar_samples[AC3_MAX_CHANNELS - 1];
uint8_t *bap_buffer;
uint8_t *bap1_buffer;
CoefType *mdct_coef_buffer;