Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

ac3: move ff_ac3_bit_alloc_calc_bap to ac3dsp

Browse Source 
Signed-off-by: Mans Rullgard <mans@mansr.com>
oldabi
Mans Rullgard 14 years ago
parent d38345878c
commit 6d9f52b2cd
9 changed files with 71 additions and 57 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 2
      configure
  2. 46
      libavcodec/ac3.c
  3. 19
      libavcodec/ac3.h
  4. 3
      libavcodec/ac3dec.c
  5. 2
      libavcodec/ac3dec.h
  6. 27
      libavcodec/ac3dsp.c
  7. 19
      libavcodec/ac3dsp.h
  8. 2
      libavcodec/ac3enc.c
  9. 8
      libavcodec/ac3tab.h

2
configure vendored
Unescape View File

@ -1238,7 +1238,7 @@ rdft_select="fft"
aac_decoder_select="mdct rdft sinewin"
aac_encoder_select="mdct sinewin"
aac_latm_decoder_select="aac_decoder aac_latm_parser"
ac3_decoder_select="mdct ac3_parser"
ac3_decoder_select="mdct ac3dsp ac3_parser"
ac3_encoder_select="mdct ac3dsp"
ac3_fixed_encoder_select="ac3dsp"
alac_encoder_select="lpc"

46
libavcodec/ac3.c
Unescape View File

@ -31,7 +31,7 @@
/**
* Starting frequency coefficient bin for each critical band.
*/
static const uint8_t band_start_tab[AC3_CRITICAL_BANDS+1] = {
const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 31,
@ -44,7 +44,7 @@ static const uint8_t band_start_tab[AC3_CRITICAL_BANDS+1] = {
/**
* Map each frequency coefficient bin to the critical band that contains it.
*/
static const uint8_t bin_to_band_tab[253] = {
const uint8_t ff_ac3_bin_to_band_tab[253] = {
0,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
@ -70,7 +70,7 @@ static const uint8_t bin_to_band_tab[253] = {
};
#else /* CONFIG_HARDCODED_TABLES */
static uint8_t bin_to_band_tab[253];
uint8_t ff_ac3_bin_to_band_tab[253];
#endif
static inline int calc_lowcomp1(int a, int b0, int b1, int c)
@ -106,10 +106,10 @@ void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
/* PSD integration */
bin = start;
band = bin_to_band_tab[start];
band = ff_ac3_bin_to_band_tab[start];
do {
int v = psd[bin++];
int band_end = FFMIN(band_start_tab[band+1], end);
int band_end = FFMIN(ff_ac3_band_start_tab[band+1], end);
for (; bin < band_end; bin++) {
int max = FFMAX(v, psd[bin]);
/* logadd */
@ -117,7 +117,7 @@ void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
v = max + ff_ac3_log_add_tab[adr];
}
band_psd[band++] = v;
} while (end > band_start_tab[band]);
} while (end > ff_ac3_band_start_tab[band]);
}
int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
@ -132,8 +132,8 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
int lowcomp, fastleak, slowleak;
/* excitation function */
band_start = bin_to_band_tab[start];
band_end = bin_to_band_tab[end-1] + 1;
band_start = ff_ac3_bin_to_band_tab[start];
band_end = ff_ac3_bin_to_band_tab[end-1] + 1;
if (band_start == 0) {
lowcomp = 0;
@ -212,30 +212,6 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
return 0;
}
void ff_ac3_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)
{
int bin, band;
/* special case, if snr offset is -960, set all bap's to zero */
if (snr_offset == -960) {
memset(bap, 0, AC3_MAX_COEFS);
return;
}
bin = start;
band = bin_to_band_tab[start];
do {
int m = (FFMAX(mask[band] - snr_offset - floor, 0) & 0x1FE0) + floor;
int band_end = FFMIN(band_start_tab[band+1], end);
for (; bin < band_end; bin++) {
int address = av_clip((psd[bin] - m) >> 5, 0, 63);
bap[bin] = bap_tab[address];
}
} while (end > band_start_tab[band++]);
}
/**
* Initialize some tables.
* note: This function must remain thread safe because it is called by the
@ -244,12 +220,12 @@ void ff_ac3_bit_alloc_calc_bap(int16_t *mask, int16_t *psd, int start, int end,
av_cold void ff_ac3_common_init(void)
{
#if !CONFIG_HARDCODED_TABLES
/* compute bin_to_band_tab from band_start_tab */
/* compute ff_ac3_bin_to_band_tab from ff_ac3_band_start_tab */
int bin = 0, band;
for (band = 0; band < AC3_CRITICAL_BANDS; band++) {
int band_end = band_start_tab[band+1];
int band_end = ff_ac3_band_start_tab[band+1];
while (bin < band_end)
bin_to_band_tab[bin++] = band;
ff_ac3_bin_to_band_tab[bin++] = band;
}
#endif /* !CONFIG_HARDCODED_TABLES */
}

19
libavcodec/ac3.h
Unescape View File

@ -175,23 +175,4 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
uint8_t *dba_lengths, uint8_t *dba_values,
int16_t *mask);
/**
* Calculate bit allocation pointers.
* The SNR is the difference between the masking curve and the signal. AC-3
* uses this value for each frequency bin to allocate bits. The snroffset
* parameter is a global adjustment to the SNR for all bins.
*
* @param[in] mask masking curve
* @param[in] psd signal power for each frequency bin
* @param[in] start starting bin location
* @param[in] end ending bin location
* @param[in] snr_offset SNR adjustment
* @param[in] floor noise floor
* @param[in] bap_tab look-up table for bit allocation pointers
* @param[out] bap bit allocation pointers
*/
void ff_ac3_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);
#endif /* AVCODEC_AC3_H */

3
libavcodec/ac3dec.c
Unescape View File

@ -184,6 +184,7 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
ff_mdct_init(&s->imdct_512, 9, 1, 1.0);
ff_kbd_window_init(s->window, 5.0, 256);
dsputil_init(&s->dsp, avctx);
ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
ff_fmt_convert_init(&s->fmt_conv, avctx);
av_lfg_init(&s->dith_state, 0);
@ -1213,7 +1214,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
/* Compute bit allocation */
const uint8_t *bap_tab = s->channel_uses_aht[ch] ?
ff_eac3_hebap_tab : ff_ac3_bap_tab;
ff_ac3_bit_alloc_calc_bap(s->mask[ch], s->psd[ch],
s->ac3dsp.bit_alloc_calc_bap(s->mask[ch], s->psd[ch],
s->start_freq[ch], s->end_freq[ch],
s->snr_offset[ch],
s->bit_alloc_params.floor,

2
libavcodec/ac3dec.h
Unescape View File

@ -52,6 +52,7 @@
#include "libavutil/lfg.h"
#include "ac3.h"
#include "ac3dsp.h"
#include "get_bits.h"
#include "dsputil.h"
#include "fft.h"
@ -192,6 +193,7 @@ typedef struct {
///@defgroup opt optimization
DSPContext dsp; ///< for optimization
AC3DSPContext ac3dsp;
FmtConvertContext fmt_conv; ///< optimized conversion functions
float mul_bias; ///< scaling for float_to_int16 conversion
///@}

27
libavcodec/ac3dsp.c
Unescape View File

@ -20,6 +20,7 @@
*/
#include "avcodec.h"
#include "ac3.h"
#include "ac3dsp.h"
static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
@ -101,6 +102,31 @@ static void float_to_fixed24_c(int32_t *dst, const float *src, unsigned int len)
} while (len > 0);
}
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)
{
int bin, band;
/* special case, if snr offset is -960, set all bap's to zero */
if (snr_offset == -960) {
memset(bap, 0, AC3_MAX_COEFS);
return;
}
bin = start;
band = ff_ac3_bin_to_band_tab[start];
do {
int m = (FFMAX(mask[band] - snr_offset - floor, 0) & 0x1FE0) + floor;
int band_end = FFMIN(ff_ac3_band_start_tab[band+1], end);
for (; bin < band_end; bin++) {
int address = av_clip((psd[bin] - m) >> 5, 0, 63);
bap[bin] = bap_tab[address];
}
} while (end > ff_ac3_band_start_tab[band++]);
}
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
{
c->ac3_exponent_min = ac3_exponent_min_c;
@ -108,6 +134,7 @@ av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
c->ac3_lshift_int16 = ac3_lshift_int16_c;
c->ac3_rshift_int32 = ac3_rshift_int32_c;
c->float_to_fixed24 = float_to_fixed24_c;
c->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_c;
if (ARCH_ARM)
ff_ac3dsp_init_arm(c, bit_exact);

19
libavcodec/ac3dsp.h
Unescape View File

@ -81,6 +81,25 @@ typedef struct AC3DSPContext {
* constraints: multiple of 32 greater than zero
*/
void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len);
/**
* Calculate bit allocation pointers.
* The SNR is the difference between the masking curve and the signal. AC-3
* uses this value for each frequency bin to allocate bits. The snroffset
* parameter is a global adjustment to the SNR for all bins.
*
* @param[in] mask masking curve
* @param[in] psd signal power for each frequency bin
* @param[in] start starting bin location
* @param[in] end ending bin location
* @param[in] snr_offset SNR adjustment
* @param[in] floor noise floor
* @param[in] bap_tab look-up table for bit allocation pointers
* @param[out] bap bit allocation pointers
*/
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);
} AC3DSPContext;
void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact);

2
libavcodec/ac3enc.c
Unescape View File

@ -1047,7 +1047,7 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
whenever we reuse exponents. */
block = s->blocks[blk].exp_ref_block[ch];
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
ff_ac3_bit_alloc_calc_bap(block->mask[ch], block->psd[ch], 0,
s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], 0,
s->nb_coefs[ch], snr_offset,
s->bit_alloc.floor, ff_ac3_bap_tab,
block->bap[ch]);

8
libavcodec/ac3tab.h
Unescape View File

@ -25,6 +25,12 @@
#include "libavutil/common.h"
#include "ac3.h"
#if CONFIG_HARDCODED_TABLES
# define HCONST const
#else
# define HCONST
#endif
extern const uint16_t ff_ac3_frame_size_tab[38][3];
extern const uint8_t ff_ac3_channels_tab[8];
extern const uint16_t ff_ac3_channel_layout_tab[8];
@ -44,6 +50,8 @@ extern const uint16_t ff_ac3_db_per_bit_tab[4];
extern const int16_t ff_ac3_floor_tab[8];
extern const uint16_t ff_ac3_fast_gain_tab[8];
extern const uint16_t ff_eac3_default_chmap[8];
extern const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1];
extern HCONST uint8_t ff_ac3_bin_to_band_tab[253];
/** Custom channel map locations bitmask
* Other channels described in documentation:

Write Preview
Loading…
Cancel
Save