* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define DEBUG
//#define ASSERT_LEVEL 2
+#include <stdint.h>
+
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "ac3dsp.h"
#include "ac3.h"
#include "audioconvert.h"
+#include "fft.h"
#ifndef CONFIG_AC3ENC_FLOAT
/** Maximum number of exponent groups. +1 for separate DC exponent. */
#define AC3_MAX_EXP_GROUPS 85
-/* stereo rematrixing algorithms */
-#define AC3_REMATRIXING_IS_STATIC 0x1
-#define AC3_REMATRIXING_SUMS 0
-#define AC3_REMATRIXING_NONE 1
-#define AC3_REMATRIXING_ALWAYS 3
-
-/** Scale a float value by 2^bits and convert to an integer. */
-#define SCALE_FLOAT(a, bits) lrintf((a) * (float)(1 << (bits)))
-
-
#if CONFIG_AC3ENC_FLOAT
-#include "ac3enc_float.h"
+#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
+typedef float SampleType;
+typedef float CoefType;
+typedef float CoefSumType;
#else
-#include "ac3enc_fixed.h"
+#define MAC_COEF(d,a,b) MAC64(d,a,b)
+typedef int16_t SampleType;
+typedef int32_t CoefType;
+typedef int64_t CoefSumType;
#endif
-
-/**
- * Encoding Options used by AVOption.
- */
-typedef struct AC3EncOptions {
- /* AC-3 metadata options*/
- int dialogue_level;
- int bitstream_mode;
- float center_mix_level;
- float surround_mix_level;
- int dolby_surround_mode;
- int audio_production_info;
- int mixing_level;
- int room_type;
- int copyright;
- int original;
- int extended_bsi_1;
- int preferred_stereo_downmix;
- float ltrt_center_mix_level;
- float ltrt_surround_mix_level;
- float loro_center_mix_level;
- float loro_surround_mix_level;
- int extended_bsi_2;
- int dolby_surround_ex_mode;
- int dolby_headphone_mode;
- int ad_converter_type;
-
- /* other encoding options */
- int allow_per_frame_metadata;
-} AC3EncOptions;
+typedef struct AC3MDCTContext {
+ const SampleType *window; ///< MDCT window function
+ FFTContext fft; ///< FFT context for MDCT calculation
+} AC3MDCTContext;
/**
* Data for a single audio block.
int loro_surround_mix_level; ///< Lo/Ro surround mix level code
int cutoff; ///< user-specified cutoff frequency, in Hz
- int bandwidth_code[AC3_MAX_CHANNELS]; ///< bandwidth code (0 to 60) (chbwcod)
+ int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
int nb_coefs[AC3_MAX_CHANNELS];
- int rematrixing; ///< determines how rematrixing strategy is calculated
+ int rematrixing_enabled; ///< stereo rematrixing enabled
int num_rematrixing_bands; ///< number of rematrixing bands
/* bitrate allocation control */
int frame_bits; ///< all frame bits except exponents and mantissas
int exponent_bits; ///< number of bits used for exponents
- /* mantissa encoding */
- int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
- uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
-
SampleType **planar_samples;
uint8_t *bap_buffer;
uint8_t *bap1_buffer;
uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
- DECLARE_ALIGNED(16, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
+ DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
} AC3EncodeContext;
+typedef struct AC3Mant {
+ uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
+ int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
+} AC3Mant;
#define CMIXLEV_NUM_OPTIONS 3
static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
#define OFFSET(param) offsetof(AC3EncodeContext, options.param)
#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
-static const AVOption options[] = {
+#if CONFIG_AC3ENC_FLOAT || !CONFIG_AC3_FLOAT_ENCODER //we need this exactly once compiled in
+const AVOption ff_ac3_options[] = {
/* Metadata Options */
-{"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), FF_OPT_TYPE_INT, 0, 0, 1, AC3ENC_PARAM},
+{"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 1, AC3ENC_PARAM},
/* downmix levels */
-{"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), FF_OPT_TYPE_FLOAT, LEVEL_MINUS_4POINT5DB, 0.0, 1.0, AC3ENC_PARAM},
-{"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), FF_OPT_TYPE_FLOAT, LEVEL_MINUS_6DB, 0.0, 1.0, AC3ENC_PARAM},
+{"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
+{"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
/* audio production information */
-{"mixing_level", "Mixing Level", OFFSET(mixing_level), FF_OPT_TYPE_INT, -1, -1, 111, AC3ENC_PARAM},
-{"room_type", "Room Type", OFFSET(room_type), FF_OPT_TYPE_INT, -1, -1, 2, AC3ENC_PARAM, "room_type"},
- {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
- {"large", "Large Room", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
- {"small", "Small Room", 0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
+{"mixing_level", "Mixing Level", OFFSET(mixing_level), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 111, AC3ENC_PARAM},
+{"room_type", "Room Type", OFFSET(room_type), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "room_type"},
+ {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
+ {"large", "Large Room", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
+ {"small", "Small Room", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
/* other metadata options */
-{"copyright", "Copyright Bit", OFFSET(copyright), FF_OPT_TYPE_INT, 0, 0, 1, AC3ENC_PARAM},
-{"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), FF_OPT_TYPE_INT, -31, -31, -1, AC3ENC_PARAM},
-{"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), FF_OPT_TYPE_INT, 0, 0, 2, AC3ENC_PARAM, "dsur_mode"},
- {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
- {"on", "Dolby Surround Encoded", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
- {"off", "Not Dolby Surround Encoded", 0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
-{"original", "Original Bit Stream", OFFSET(original), FF_OPT_TYPE_INT, 1, 0, 1, AC3ENC_PARAM},
+{"copyright", "Copyright Bit", OFFSET(copyright), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 1, AC3ENC_PARAM},
+{"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), FF_OPT_TYPE_INT, {.dbl = -31 }, -31, -1, AC3ENC_PARAM},
+{"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, AC3ENC_PARAM, "dsur_mode"},
+ {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
+ {"on", "Dolby Surround Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
+ {"off", "Not Dolby Surround Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
+{"original", "Original Bit Stream", OFFSET(original), FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 1, AC3ENC_PARAM},
/* extended bitstream information */
-{"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), FF_OPT_TYPE_INT, -1, -1, 2, AC3ENC_PARAM, "dmix_mode"},
- {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
- {"ltrt", "Lt/Rt Downmix Preferred", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
- {"loro", "Lo/Ro Downmix Preferred", 0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
-{"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), FF_OPT_TYPE_FLOAT, -1.0, -1.0, 2.0, AC3ENC_PARAM},
-{"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), FF_OPT_TYPE_FLOAT, -1.0, -1.0, 2.0, AC3ENC_PARAM},
-{"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), FF_OPT_TYPE_FLOAT, -1.0, -1.0, 2.0, AC3ENC_PARAM},
-{"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), FF_OPT_TYPE_FLOAT, -1.0, -1.0, 2.0, AC3ENC_PARAM},
-{"dsurex_mode", "Dolby Surround EX Mode", OFFSET(dolby_surround_ex_mode), FF_OPT_TYPE_INT, -1, -1, 2, AC3ENC_PARAM, "dsurex_mode"},
- {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
- {"on", "Dolby Surround EX Encoded", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
- {"off", "Not Dolby Surround EX Encoded", 0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
-{"dheadphone_mode", "Dolby Headphone Mode", OFFSET(dolby_headphone_mode), FF_OPT_TYPE_INT, -1, -1, 2, AC3ENC_PARAM, "dheadphone_mode"},
- {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
- {"on", "Dolby Headphone Encoded", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
- {"off", "Not Dolby Headphone Encoded", 0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
-{"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), FF_OPT_TYPE_INT, -1, -1, 1, AC3ENC_PARAM, "ad_conv_type"},
- {"standard", "Standard (default)", 0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
- {"hdcd", "HDCD", 0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
+{"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "dmix_mode"},
+ {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
+ {"ltrt", "Lt/Rt Downmix Preferred", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
+ {"loro", "Lo/Ro Downmix Preferred", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
+{"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
+{"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
+{"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
+{"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
+{"dsurex_mode", "Dolby Surround EX Mode", OFFSET(dolby_surround_ex_mode), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "dsurex_mode"},
+ {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
+ {"on", "Dolby Surround EX Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
+ {"off", "Not Dolby Surround EX Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsurex_mode"},
+{"dheadphone_mode", "Dolby Headphone Mode", OFFSET(dolby_headphone_mode), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "dheadphone_mode"},
+ {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
+ {"on", "Dolby Headphone Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
+ {"off", "Not Dolby Headphone Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dheadphone_mode"},
+{"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 1, AC3ENC_PARAM, "ad_conv_type"},
+ {"standard", "Standard (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
+ {"hdcd", "HDCD", 0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
+/* Other Encoding Options */
+{"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 1, AC3ENC_PARAM},
{NULL}
};
+#endif
#if CONFIG_AC3ENC_FLOAT
static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
- options, LIBAVUTIL_VERSION_INT };
+ ff_ac3_options, LIBAVUTIL_VERSION_INT };
#else
static AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
- options, LIBAVUTIL_VERSION_INT };
+ ff_ac3_options, LIBAVUTIL_VERSION_INT };
#endif
static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
int nbits);
-static void mdct512(AC3MDCTContext *mdct, CoefType *out, SampleType *in);
-
static void apply_window(DSPContext *dsp, SampleType *output, const SampleType *input,
const SampleType *window, unsigned int len);
/**
* List of supported channel layouts.
*/
-static const int64_t ac3_channel_layouts[] = {
+#if CONFIG_AC3ENC_FLOAT || !CONFIG_AC3_FLOAT_ENCODER //we need this exactly once compiled in
+const int64_t ff_ac3_channel_layouts[] = {
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
AV_CH_LAYOUT_2_1,
AV_CH_LAYOUT_5POINT1_BACK,
0
};
+#endif
+
+
+/**
+ * LUT to select the bandwidth code based on the bit rate, sample rate, and
+ * number of full-bandwidth channels.
+ * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
+ */
+static const uint8_t ac3_bandwidth_tab[5][3][19] = {
+// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
+
+ { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
+ { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
+ { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
+
+ { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
+ { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
+ { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
+
+ { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
+
+ { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
+
+ { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
+};
/**
/**
* Deinterleave input samples.
- * Channels are reordered from Libav's default order to AC-3 order.
+ * Channels are reordered from FFmpeg's default order to AC-3 order.
*/
static void deinterleave_input_samples(AC3EncodeContext *s,
const SampleType *samples)
block->coeff_shift[ch] = normalize_samples(s);
- mdct512(&s->mdct, block->mdct_coef[ch], s->windowed_samples);
+ s->mdct.fft.mdct_calcw(&s->mdct.fft, block->mdct_coef[ch],
+ s->windowed_samples);
}
}
}
-/**
- * Initialize stereo rematrixing.
- * If the strategy does not change for each frame, set the rematrixing flags.
- */
-static void rematrixing_init(AC3EncodeContext *s)
-{
- if (s->channel_mode == AC3_CHMODE_STEREO)
- s->rematrixing = AC3_REMATRIXING_SUMS;
- else
- s->rematrixing = AC3_REMATRIXING_NONE;
- /* NOTE: AC3_REMATRIXING_ALWAYS might be used in
- the future in conjunction with channel coupling. */
-
- if (s->rematrixing & AC3_REMATRIXING_IS_STATIC) {
- int flag = (s->rematrixing == AC3_REMATRIXING_ALWAYS);
- s->blocks[0].new_rematrixing_strategy = 1;
- memset(s->blocks[0].rematrixing_flags, flag,
- sizeof(s->blocks[0].rematrixing_flags));
- }
-}
-
-
/**
* Determine rematrixing flags for each block and band.
*/
int blk, bnd, i;
AC3Block *block, *block0;
- s->num_rematrixing_bands = 4;
-
- if (s->rematrixing & AC3_REMATRIXING_IS_STATIC)
+ if (s->channel_mode != AC3_CHMODE_STEREO)
return;
+ s->num_rematrixing_bands = 4;
+
nb_coefs = FFMIN(s->nb_coefs[0], s->nb_coefs[1]);
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
block = &s->blocks[blk];
block->new_rematrixing_strategy = !blk;
+ if (!s->rematrixing_enabled)
+ continue;
for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++) {
/* calculate calculate sum of squared coeffs for one band in one block */
int start = ff_ac3_rematrix_band_tab[bnd];
int start, end;
uint8_t *flags;
- if (s->rematrixing == AC3_REMATRIXING_NONE)
+ if (!s->rematrixing_enabled)
return;
nb_coefs = FFMIN(s->nb_coefs[0], s->nb_coefs[1]);
*/
static av_cold void exponent_init(AC3EncodeContext *s)
{
- int i;
- for (i = 73; i < 256; i++) {
- exponent_group_tab[0][i] = (i - 1) / 3;
- exponent_group_tab[1][i] = (i + 2) / 6;
- exponent_group_tab[2][i] = (i + 8) / 12;
+ int expstr, i, grpsize;
+
+ for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
+ grpsize = 3 << expstr;
+ for (i = 73; i < 256; i++) {
+ exponent_group_tab[expstr][i] = (i + grpsize - 4) / grpsize;
+ }
}
/* LFE */
exponent_group_tab[0][7] = 2;
*/
static void extract_exponents(AC3EncodeContext *s)
{
- int blk, ch, i;
+ int blk, ch;
for (ch = 0; ch < s->channels; ch++) {
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
- uint8_t *exp = block->exp[ch];
- int32_t *coef = block->fixed_coef[ch];
- for (i = 0; i < AC3_MAX_COEFS; i++) {
- int e;
- int v = abs(coef[i]);
- if (v == 0)
- e = 24;
- else {
- e = 23 - av_log2(v);
- if (e >= 24) {
- e = 24;
- coef[i] = 0;
- }
- av_assert2(e >= 0);
- }
- exp[i] = e;
- }
+ s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch],
+ AC3_MAX_COEFS);
}
}
}
#define EXP_DIFF_THRESHOLD 500
-/**
- * Calculate exponent strategies for all blocks in a single channel.
- */
-static void compute_exp_strategy_ch(AC3EncodeContext *s, uint8_t *exp_strategy,
- uint8_t *exp)
-{
- int blk, blk1;
- int exp_diff;
-
- /* estimate if the exponent variation & decide if they should be
- reused in the next frame */
- exp_strategy[0] = EXP_NEW;
- exp += AC3_MAX_COEFS;
- for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) {
- exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
- if (exp_diff > EXP_DIFF_THRESHOLD)
- exp_strategy[blk] = EXP_NEW;
- else
- exp_strategy[blk] = EXP_REUSE;
- exp += AC3_MAX_COEFS;
- }
-
- /* now select the encoding strategy type : if exponents are often
- recoded, we use a coarse encoding */
- blk = 0;
- while (blk < AC3_MAX_BLOCKS) {
- blk1 = blk + 1;
- while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE)
- blk1++;
- switch (blk1 - blk) {
- case 1: exp_strategy[blk] = EXP_D45; break;
- case 2:
- case 3: exp_strategy[blk] = EXP_D25; break;
- default: exp_strategy[blk] = EXP_D15; break;
- }
- blk = blk1;
- }
-}
-
-
/**
* Calculate exponent strategies for all channels.
* Array arrangement is reversed to simplify the per-channel calculation.
*/
static void compute_exp_strategy(AC3EncodeContext *s)
{
- int ch, blk;
+ int ch, blk, blk1;
for (ch = 0; ch < s->fbw_channels; ch++) {
- compute_exp_strategy_ch(s, s->exp_strategy[ch], s->blocks[0].exp[ch]);
+ uint8_t *exp_strategy = s->exp_strategy[ch];
+ uint8_t *exp = s->blocks[0].exp[ch];
+ int exp_diff;
+
+ /* estimate if the exponent variation & decide if they should be
+ reused in the next frame */
+ exp_strategy[0] = EXP_NEW;
+ exp += AC3_MAX_COEFS;
+ for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) {
+ exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
+ if (exp_diff > EXP_DIFF_THRESHOLD)
+ exp_strategy[blk] = EXP_NEW;
+ else
+ exp_strategy[blk] = EXP_REUSE;
+ exp += AC3_MAX_COEFS;
+ }
+
+ /* now select the encoding strategy type : if exponents are often
+ recoded, we use a coarse encoding */
+ blk = 0;
+ while (blk < AC3_MAX_BLOCKS) {
+ blk1 = blk + 1;
+ while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE)
+ blk1++;
+ switch (blk1 - blk) {
+ case 1: exp_strategy[blk] = EXP_D45; break;
+ case 2:
+ case 3: exp_strategy[blk] = EXP_D25; break;
+ default: exp_strategy[blk] = EXP_D15; break;
+ }
+ blk = blk1;
+ }
}
if (s->lfe_on) {
ch = s->lfe_channel;
* no auxilliary data
*/
- /* header size */
+ /* header */
frame_bits = 65;
frame_bits += frame_bits_inc[s->channel_mode];
/* audio blocks */
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
- frame_bits += s->fbw_channels * 2 + 2; /* blksw * c, dithflag * c, dynrnge, cplstre */
- if (s->channel_mode == AC3_CHMODE_STEREO) {
- frame_bits++; /* rematstr */
- }
- frame_bits += 2 * s->fbw_channels; /* chexpstr[2] * c */
+ /* block switch flags */
+ frame_bits += s->fbw_channels;
+
+ /* dither flags */
+ frame_bits += s->fbw_channels;
+
+ /* dynamic range */
+ frame_bits++;
+
+ /* coupling strategy */
+ frame_bits++;
+ if (!blk)
+ frame_bits++;
+
+ /* exponent strategy */
+ frame_bits += 2 * s->fbw_channels;
if (s->lfe_on)
- frame_bits++; /* lfeexpstr */
- frame_bits++; /* baie */
- frame_bits++; /* snr */
- frame_bits += 2; /* delta / skip */
+ frame_bits++;
+
+ /* bit allocation params */
+ frame_bits++;
+ if (!blk)
+ frame_bits += 2 + 2 + 2 + 2 + 3;
+
+ /* snr offsets and fast gain codes */
+ frame_bits++;
+ if (!blk)
+ frame_bits += 6 + s->channels * (4 + 3);
+
+ /* delta bit allocation */
+ frame_bits++;
+
+ /* skipped data */
+ frame_bits++;
}
- frame_bits++; /* cplinu for block 0 */
- /* bit alloc info */
- /* sdcycod[2], fdcycod[2], sgaincod[2], dbpbcod[2], floorcod[3] */
- /* csnroffset[6] */
- /* (fsnoffset[4] + fgaincod[4]) * c */
- frame_bits += 2*4 + 3 + 6 + s->channels * (4 + 3);
- /* auxdatae, crcrsv */
- frame_bits += 2;
+ /* auxiliary data */
+ frame_bits++;
/* CRC */
- frame_bits += 16;
+ frame_bits += 1 + 16;
s->frame_bits_fixed = frame_bits;
}
int blk, ch;
int frame_bits = 0;
+ /* header */
if (opt->audio_production_info)
frame_bits += 7;
if (s->bitstream_id == 6) {
frame_bits += 14;
}
+ /* audio blocks */
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
/* stereo rematrixing */
- if (s->channel_mode == AC3_CHMODE_STEREO &&
- s->blocks[blk].new_rematrixing_strategy) {
- frame_bits += s->num_rematrixing_bands;
+ if (s->channel_mode == AC3_CHMODE_STEREO) {
+ frame_bits++;
+ if (s->blocks[blk].new_rematrixing_strategy)
+ frame_bits += s->num_rematrixing_bands;
}
+ /* bandwidth codes & gain range */
for (ch = 0; ch < s->fbw_channels; ch++) {
if (s->exp_strategy[ch][blk] != EXP_REUSE)
- frame_bits += 6 + 2; /* chbwcod[6], gainrng[2] */
+ frame_bits += 6 + 2;
}
}
- s->frame_bits = s->frame_bits_fixed + frame_bits;
-}
-
-/**
- * Calculate the number of bits needed to encode a set of mantissas.
- */
-static int compute_mantissa_size(int mant_cnt[5], uint8_t *bap, int nb_coefs)
-{
- int bits, b, i;
-
- bits = 0;
- for (i = 0; i < nb_coefs; i++) {
- b = bap[i];
- if (b <= 4) {
- // bap=1 to bap=4 will be counted in compute_mantissa_size_final
- mant_cnt[b]++;
- } else if (b <= 13) {
- // bap=5 to bap=13 use (bap-1) bits
- bits += b - 1;
- } else {
- // bap=14 uses 14 bits and bap=15 uses 16 bits
- bits += (b == 14) ? 14 : 16;
- }
- }
- return bits;
+ s->frame_bits = s->frame_bits_fixed + frame_bits;
}
reset_block_bap(s);
mantissa_bits = 0;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
- AC3Block *block;
+ AC3Block *block = &s->blocks[blk];
+ AC3Block *ref_block;
// initialize grouped mantissa counts. these are set so that they are
// padded to the next whole group size when bits are counted in
// compute_mantissa_size_final
blocks within a frame are the exponent values. We can take
advantage of that by reusing the bit allocation pointers
whenever we reuse exponents. */
- block = s->blocks[blk].exp_ref_block[ch];
+ ref_block = block->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->nb_coefs[ch], snr_offset,
- s->bit_alloc.floor, ff_ac3_bap_tab,
- block->bap[ch]);
+ s->ac3dsp.bit_alloc_calc_bap(ref_block->mask[ch],
+ ref_block->psd[ch], 0,
+ s->nb_coefs[ch], snr_offset,
+ s->bit_alloc.floor, ff_ac3_bap_tab,
+ ref_block->bap[ch]);
}
- mantissa_bits += compute_mantissa_size(mant_cnt, block->bap[ch], s->nb_coefs[ch]);
+ mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt,
+ ref_block->bap[ch],
+ s->nb_coefs[ch]);
}
mantissa_bits += compute_mantissa_size_final(mant_cnt);
}
int snr_offset, snr_incr;
bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
- av_assert2(bits_left >= 0);
+ if (bits_left < 0)
+ return AVERROR(EINVAL);
snr_offset = s->coarse_snr_offset << 4;
}
-/**
- * Reduce the bandwidth to reduce the number of bits used for a given SNR offset.
- * This is a second fallback for when bit allocation still fails after exponents
- * have been downgraded.
- * @return non-zero if bandwidth reduction was unsuccessful
- */
-static int reduce_bandwidth(AC3EncodeContext *s, int min_bw_code)
-{
- int ch;
-
- if (s->bandwidth_code[0] > min_bw_code) {
- for (ch = 0; ch < s->fbw_channels; ch++) {
- s->bandwidth_code[ch]--;
- s->nb_coefs[ch] = s->bandwidth_code[ch] * 3 + 73;
- }
- return 0;
- }
- return -1;
-}
-
-
/**
* Perform bit allocation search.
* Finds the SNR offset value that maximizes quality and fits in the specified
continue;
}
- /* fallback 2: reduce bandwidth */
- /* only do this if the user has not specified a specific cutoff
- frequency */
- if (!s->cutoff && !reduce_bandwidth(s, 0)) {
- process_exponents(s);
- ret = compute_bit_allocation(s);
- continue;
- }
-
/* fallbacks were not enough... */
break;
}
*/
static inline int sym_quant(int c, int e, int levels)
{
- int v = ((((levels * c) >> (24 - e)) + 1) >> 1) + (levels >> 1);
+ int v = (((levels * c) >> (24 - e)) + levels) >> 1;
av_assert2(v >= 0 && v < levels);
return v;
}
/**
* Quantize a set of mantissas for a single channel in a single block.
*/
-static void quantize_mantissas_blk_ch(AC3EncodeContext *s, int32_t *fixed_coef,
+static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
uint8_t *exp,
uint8_t *bap, uint16_t *qmant, int n)
{
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
AC3Block *ref_block;
- s->mant1_cnt = s->mant2_cnt = s->mant4_cnt = 0;
- s->qmant1_ptr = s->qmant2_ptr = s->qmant4_ptr = NULL;
+ AC3Mant m = { 0 };
for (ch = 0; ch < s->channels; ch++) {
ref_block = block->exp_ref_block[ch];
- quantize_mantissas_blk_ch(s, block->fixed_coef[ch],
+ quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
ref_block->exp[ch], ref_block->bap[ch],
block->qmant[ch], s->nb_coefs[ch]);
}
/* bandwidth */
for (ch = 0; ch < s->fbw_channels; ch++) {
if (s->exp_strategy[ch][blk] != EXP_REUSE)
- put_bits(&s->pb, 6, s->bandwidth_code[ch]);
+ put_bits(&s->pb, 6, s->bandwidth_code);
}
/* exponents */
char strbuf[32];
switch (s->bitstream_id) {
- case 6: strncpy(strbuf, "AC-3 (alt syntax)", 32); break;
- case 8: strncpy(strbuf, "AC-3 (standard)", 32); break;
- case 9: strncpy(strbuf, "AC-3 (dnet half-rate)", 32); break;
- case 10: strncpy(strbuf, "AC-3 (dnet quater-rate", 32); break;
+ case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break;
+ case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break;
+ case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break;
+ case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate", 32); break;
default: snprintf(strbuf, 32, "ERROR");
}
av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
if (opt->audio_production_info) {
av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
switch (opt->room_type) {
- case 0: strncpy(strbuf, "notindicated", 32); break;
- case 1: strncpy(strbuf, "large", 32); break;
- case 2: strncpy(strbuf, "small", 32); break;
+ case 0: av_strlcpy(strbuf, "notindicated", 32); break;
+ case 1: av_strlcpy(strbuf, "large", 32); break;
+ case 2: av_strlcpy(strbuf, "small", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
}
av_dlog(avctx, "room_type: %s\n", strbuf);
av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
if (s->channel_mode == AC3_CHMODE_STEREO) {
switch (opt->dolby_surround_mode) {
- case 0: strncpy(strbuf, "notindicated", 32); break;
- case 1: strncpy(strbuf, "on", 32); break;
- case 2: strncpy(strbuf, "off", 32); break;
+ case 0: av_strlcpy(strbuf, "notindicated", 32); break;
+ case 1: av_strlcpy(strbuf, "on", 32); break;
+ case 2: av_strlcpy(strbuf, "off", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
}
av_dlog(avctx, "dsur_mode: %s\n", strbuf);
if (s->bitstream_id == 6) {
if (opt->extended_bsi_1) {
switch (opt->preferred_stereo_downmix) {
- case 0: strncpy(strbuf, "notindicated", 32); break;
- case 1: strncpy(strbuf, "ltrt", 32); break;
- case 2: strncpy(strbuf, "loro", 32); break;
+ case 0: av_strlcpy(strbuf, "notindicated", 32); break;
+ case 1: av_strlcpy(strbuf, "ltrt", 32); break;
+ case 2: av_strlcpy(strbuf, "loro", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
}
av_dlog(avctx, "dmix_mode: %s\n", strbuf);
}
if (opt->extended_bsi_2) {
switch (opt->dolby_surround_ex_mode) {
- case 0: strncpy(strbuf, "notindicated", 32); break;
- case 1: strncpy(strbuf, "on", 32); break;
- case 2: strncpy(strbuf, "off", 32); break;
+ case 0: av_strlcpy(strbuf, "notindicated", 32); break;
+ case 1: av_strlcpy(strbuf, "on", 32); break;
+ case 2: av_strlcpy(strbuf, "off", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
}
av_dlog(avctx, "dsurex_mode: %s\n", strbuf);
switch (opt->dolby_headphone_mode) {
- case 0: strncpy(strbuf, "notindicated", 32); break;
- case 1: strncpy(strbuf, "on", 32); break;
- case 2: strncpy(strbuf, "off", 32); break;
+ case 0: av_strlcpy(strbuf, "notindicated", 32); break;
+ case 1: av_strlcpy(strbuf, "on", 32); break;
+ case 2: av_strlcpy(strbuf, "off", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
}
av_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
switch (opt->ad_converter_type) {
- case 0: strncpy(strbuf, "standard", 32); break;
- case 1: strncpy(strbuf, "hdcd", 32); break;
+ case 0: av_strlcpy(strbuf, "standard", 32); break;
+ case 1: av_strlcpy(strbuf, "hdcd", 32); break;
default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
}
av_dlog(avctx, "ad_conv_type: %s\n", strbuf);
ch_layout = *channel_layout;
if (!ch_layout)
ch_layout = avcodec_guess_channel_layout(channels, CODEC_ID_AC3, NULL);
- if (av_get_channel_layout_nb_channels(ch_layout) != channels)
- return AVERROR(EINVAL);
s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY);
s->channels = channels;
if (ret)
return ret;
+ s->rematrixing_enabled = s->options.stereo_rematrixing &&
+ (s->channel_mode == AC3_CHMODE_STEREO);
+
return 0;
}
*/
static av_cold void set_bandwidth(AC3EncodeContext *s)
{
- int ch, bw_code;
+ int ch;
if (s->cutoff) {
/* calculate bandwidth based on user-specified cutoff frequency */
int fbw_coeffs;
fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
- bw_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
+ s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
} else {
/* use default bandwidth setting */
- /* XXX: should compute the bandwidth according to the frame
- size, so that we avoid annoying high frequency artifacts */
- bw_code = 50;
+ s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
}
/* set number of coefficients for each channel */
for (ch = 0; ch < s->fbw_channels; ch++) {
- s->bandwidth_code[ch] = bw_code;
- s->nb_coefs[ch] = bw_code * 3 + 73;
+ s->nb_coefs[ch] = s->bandwidth_code * 3 + 73;
}
if (s->lfe_on)
s->nb_coefs[s->lfe_channel] = 7; /* LFE channel always has 7 coefs */
set_bandwidth(s);
- rematrixing_init(s);
-
exponent_init(s);
bit_alloc_init(s);
projects / ffmpeg / blobdiff