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ac3enc: Add channel coupling support for the fixed-point AC-3 encoder. 

Update FATE references accordingly.
This commit is contained in:
Justin Ruggles 2011-08-07 17:47:42 -04:00
parent a0d17b6d45
commit ae264bb29b
8 changed files with 67 additions and 37 deletions
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2
libavcodec/ac3enc.c
View File

@ -2167,7 +2167,7 @@ static av_cold int validate_options(AC3EncodeContext *s)
(s->channel_mode == AC3_CHMODE_STEREO);
s->cpl_enabled = s->options.channel_coupling &&
s->channel_mode >= AC3_CHMODE_STEREO && !s->fixed_point;
s->channel_mode >= AC3_CHMODE_STEREO;
return 0;
}

2
libavcodec/ac3enc.h
View File

@ -52,6 +52,7 @@
#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
#define COEF_MIN (-16777215.0/16777216.0)
#define COEF_MAX ( 16777215.0/16777216.0)
#define NEW_CPL_COORD_THRESHOLD 0.03
typedef float SampleType;
typedef float CoefType;
typedef float CoefSumType;
@ -60,6 +61,7 @@ typedef float CoefSumType;
#define MAC_COEF(d,a,b) MAC64(d,a,b)
#define COEF_MIN -16777215
#define COEF_MAX 16777215
#define NEW_CPL_COORD_THRESHOLD 503317
typedef int16_t SampleType;
typedef int32_t CoefType;
typedef int64_t CoefSumType;

17
libavcodec/ac3enc_fixed.c
View File

@ -29,6 +29,7 @@
#define CONFIG_FFT_FLOAT 0
#undef CONFIG_AC3ENC_FLOAT
#include "ac3enc.h"
#include "eac3enc.h"
#define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED
#include "ac3enc_opts_template.c"
@ -112,6 +113,22 @@ static void clip_coefficients(DSPContext *dsp, int32_t *coef, unsigned int len)
}
/**
* Calculate a single coupling coordinate.
*/
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
{
if (energy_cpl <= COEF_MAX) {
return 1048576;
} else {
uint64_t coord = energy_ch / (energy_cpl >> 24);
uint32_t coord32 = FFMIN(coord, 1073741824);
coord32 = ff_sqrt(coord32) << 9;
return FFMIN(coord32, COEF_MAX);
}
}
static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
{
AC3EncodeContext *s = avctx->priv_data;

12
libavcodec/ac3enc_float.c
View File

@ -120,6 +120,18 @@ static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
}
/**
* Calculate a single coupling coordinate.
*/
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
{
float coord = 0.125;
if (energy_cpl > 0)
coord *= sqrtf(energy_ch / energy_cpl);
return FFMIN(coord, COEF_MAX);
}
#if CONFIG_AC3_ENCODER
AVCodec ff_ac3_encoder = {
.name = "ac3",

2
libavcodec/ac3enc_opts_template.c
View File

@ -72,11 +72,9 @@ static const AVOption eac3_options[] = {
{"hdcd", "HDCD", 0, FF_OPT_TYPE_CONST, {.dbl = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
/* Other Encoding Options */
{"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), FF_OPT_TYPE_INT, {.dbl = AC3ENC_OPT_ON }, AC3ENC_OPT_OFF, AC3ENC_OPT_ON, AC3ENC_PARAM},
#if AC3ENC_TYPE != AC3ENC_TYPE_AC3_FIXED
{"channel_coupling", "Channel Coupling", OFFSET(channel_coupling), FF_OPT_TYPE_INT, {.dbl = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, AC3ENC_OPT_ON, AC3ENC_PARAM, "channel_coupling"},
{"auto", "Selected by the Encoder", 0, FF_OPT_TYPE_CONST, {.dbl = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, "channel_coupling"},
{"cpl_start_band", "Coupling Start Band", OFFSET(cpl_start), FF_OPT_TYPE_INT, {.dbl = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, 15, AC3ENC_PARAM, "cpl_start_band"},
{"auto", "Selected by the Encoder", 0, FF_OPT_TYPE_CONST, {.dbl = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, "cpl_start_band"},
#endif
{NULL}
};

32
libavcodec/ac3enc_template.c
View File

@ -41,6 +41,8 @@ static int normalize_samples(AC3EncodeContext *s);
static void clip_coefficients(DSPContext *dsp, CoefType *coef, unsigned int len);
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl);
int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s)
{
@ -118,32 +120,25 @@ static void apply_mdct(AC3EncodeContext *s)
}
/**
* Calculate a single coupling coordinate.
*/
static inline float calc_cpl_coord(float energy_ch, float energy_cpl)
{
float coord = 0.125;
if (energy_cpl > 0)
coord *= sqrtf(energy_ch / energy_cpl);
return FFMIN(coord, COEF_MAX);
}
/**
* Calculate coupling channel and coupling coordinates.
*/
static void apply_channel_coupling(AC3EncodeContext *s)
{
LOCAL_ALIGNED_16(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
#if CONFIG_AC3ENC_FLOAT
LOCAL_ALIGNED_16(float, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
LOCAL_ALIGNED_16(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
#else
int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords;
#endif
int blk, ch, bnd, i, j;
CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
int cpl_start, num_cpl_coefs;
memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*fixed_cpl_coords));
#if CONFIG_AC3ENC_FLOAT
memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
#endif
/* align start to 16-byte boundary. align length to multiple of 32.
note: coupling start bin % 4 will always be 1 */
@ -231,11 +226,11 @@ static void apply_channel_coupling(AC3EncodeContext *s)
} else {
CoefSumType coord_diff = 0;
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
coord_diff += fabs(cpl_coords[blk-1][ch][bnd] -
cpl_coords[blk ][ch][bnd]);
coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] -
cpl_coords[blk ][ch][bnd]);
}
coord_diff /= s->num_cpl_bands;
if (coord_diff > 0.03)
if (coord_diff > NEW_CPL_COORD_THRESHOLD)
block->new_cpl_coords[ch] = 1;
}
}
@ -282,9 +277,11 @@ static void apply_channel_coupling(AC3EncodeContext *s)
if (!block->cpl_in_use)
continue;
#if CONFIG_AC3ENC_FLOAT
s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
cpl_coords[blk][1],
s->fbw_channels * 16);
#endif
s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
fixed_cpl_coords[blk][1],
s->fbw_channels * 16);
@ -328,7 +325,6 @@ static void apply_channel_coupling(AC3EncodeContext *s)
if (CONFIG_EAC3_ENCODER && s->eac3)
ff_eac3_set_cpl_states(s);
#endif /* CONFIG_AC3ENC_FLOAT */
}

2
tests/ref/acodec/ac3_fixed
View File

@ -1,2 +1,2 @@
0f14801e166819dd4a58981aea36e08b *./tests/data/acodec/ac3.rm
e7fa185030a56d9db8663ad9e38c6c94 *./tests/data/acodec/ac3.rm
98751 ./tests/data/acodec/ac3.rm

35
tests/ref/seek/ac3_rm
View File

@ -5,35 +5,40 @@ ret:-1 st:-1 flags:1 ts: 1.894167
ret:-1 st: 0 flags:0 ts: 0.788000
ret: 0 st: 0 flags:1 ts:-0.317000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st:-1 flags:0 ts: 2.576668
ret: 0 st: 0 flags:1 dts: 2.577000 pts: 2.577000 pos: 42397 size: 558
ret:-1 st:-1 flags:0 ts: 2.576668
ret:-1 st:-1 flags:1 ts: 1.470835
ret:-1 st: 0 flags:0 ts: 0.365000
ret: 0 st: 0 flags:1 ts:-0.741000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st:-1 flags:0 ts: 2.153336
ret: 0 st: 0 flags:1 dts: 2.159000 pts: 2.159000 pos: 35567 size: 556
ret:-1 st:-1 flags:0 ts: 2.153336
ret:-1 st:-1 flags:1 ts: 1.047503
ret: 0 st: 0 flags:0 ts:-0.058000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret:-1 st: 0 flags:1 ts: 2.836000
ret:-1 st:-1 flags:0 ts: 1.730004
ret:-1 st:-1 flags:1 ts: 0.624171
ret: 0 st:-1 flags:0 ts: 1.730004
ret: 0 st: 0 flags:1 dts:8589.800000 pts:8589.800000 pos: 65950 size: 32801
ret: 0 st:-1 flags:1 ts: 0.624171
ret: 0 st: 0 flags:1 dts: 0.256000 pts: 0.256000 pos: 65337 size: 400
ret: 0 st: 0 flags:0 ts:-0.482000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st: 0 flags:1 ts: 2.413000
ret: 0 st: 0 flags:1 dts: 2.368000 pts: 2.368000 pos: 38981 size: 558
ret:-1 st:-1 flags:0 ts: 1.306672
ret:-1 st:-1 flags:1 ts: 0.200839
ret:-1 st: 0 flags:1 ts: 2.413000
ret: 0 st:-1 flags:0 ts: 1.306672
ret: 0 st: 0 flags:1 dts:8589.800000 pts:8589.800000 pos: 65950 size: 32801
ret: 0 st:-1 flags:1 ts: 0.200839
ret: 0 st: 0 flags:1 dts: 0.034000 pts: 0.034000 pos: 839 size: 558
ret: 0 st: 0 flags:0 ts:-0.905000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret:-1 st: 0 flags:1 ts: 1.989000
ret:-1 st:-1 flags:0 ts: 0.883340
ret: 0 st: 0 flags:1 ts: 1.989000
ret: 0 st: 0 flags:1 dts: 0.256000 pts: 0.256000 pos: 65337 size: 400
ret: 0 st:-1 flags:0 ts: 0.883340
ret: 0 st: 0 flags:1 dts: 3.378000 pts: 3.378000 pos: 55491 size: 558
ret: 0 st:-1 flags:1 ts:-0.222493
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st: 0 flags:0 ts: 2.672000
ret: 0 st: 0 flags:1 dts: 2.821000 pts: 2.821000 pos: 46383 size: 556
ret:-1 st: 0 flags:1 ts: 1.566000
ret:-1 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:1 dts: 3.378000 pts: 3.378000 pos: 55491 size: 558
ret: 0 st: 0 flags:1 ts: 1.566000
ret: 0 st: 0 flags:1 dts: 0.256000 pts: 0.256000 pos: 65337 size: 400
ret: 0 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:1 dts: 3.378000 pts: 3.378000 pos: 55491 size: 558
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556