* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; 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 "libavcore/audioconvert.h"
+#include <stdint.h>
+
+#include "libavutil/audioconvert.h"
+#include "libavutil/avassert.h"
#include "libavutil/crc.h"
+#include "libavutil/opt.h"
#include "avcodec.h"
#include "put_bits.h"
#include "dsputil.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
+typedef struct AC3MDCTContext {
+ const SampleType *window; ///< MDCT window function
+ FFTContext fft; ///< FFT context for MDCT calculation
+} AC3MDCTContext;
+
+/**
+ * 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;
+ int stereo_rematrixing;
+} AC3EncOptions;
/**
* Data for a single audio block.
int16_t **band_psd; ///< psd per critical band
int16_t **mask; ///< masking curve
uint16_t **qmant; ///< quantized mantissas
- int8_t exp_shift[AC3_MAX_CHANNELS]; ///< exponent shift values
+ uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values
uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
uint8_t rematrixing_flags[4]; ///< rematrixing flags
+ struct AC3Block *exp_ref_block[AC3_MAX_CHANNELS]; ///< reference blocks for EXP_REUSE
} AC3Block;
/**
* AC-3 encoder private context.
*/
typedef struct AC3EncodeContext {
+ AVClass *av_class; ///< AVClass used for AVOption
+ AC3EncOptions options; ///< encoding options
PutBitContext pb; ///< bitstream writer context
DSPContext dsp;
+ AC3DSPContext ac3dsp; ///< AC-3 optimized functions
AC3MDCTContext mdct; ///< MDCT context
AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
int channels; ///< total number of channels (nchans)
int lfe_on; ///< indicates if there is an LFE channel (lfeon)
int lfe_channel; ///< channel index of the LFE channel
+ int has_center; ///< indicates if there is a center channel
+ int has_surround; ///< indicates if there are one or more surround channels
int channel_mode; ///< channel mode (acmod)
const uint8_t *channel_map; ///< channel map used to reorder channels
+ int center_mix_level; ///< center mix level code
+ int surround_mix_level; ///< surround mix level code
+ int ltrt_center_mix_level; ///< Lt/Rt center mix level code
+ int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code
+ int loro_center_mix_level; ///< Lo/Ro center mix level code
+ 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 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 slow_gain_code; ///< slow gain code (sgaincod)
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] = {
+ LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
+};
+
+#define SURMIXLEV_NUM_OPTIONS 3
+static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
+ LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
+};
+
+#define EXTMIXLEV_NUM_OPTIONS 8
+static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
+ LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB,
+ LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
+};
+
+
+#define OFFSET(param) offsetof(AC3EncodeContext, options.param)
+#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
+
+static const AVOption 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},
+/* 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},
+/* 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"},
+/* 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},
+/* 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"},
+/* Other Encoding Options */
+{"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), FF_OPT_TYPE_INT, 1, 0, 1, AC3ENC_PARAM},
+{NULL}
+};
+
+#if CONFIG_AC3ENC_FLOAT
+static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
+ options, LIBAVUTIL_VERSION_INT };
+#else
+static AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
+ options, LIBAVUTIL_VERSION_INT };
+#endif
+
/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
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, int n);
+ const SampleType *window, unsigned int len);
static int normalize_samples(AC3EncodeContext *s);
};
+/**
+ * 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 } }
+};
+
+
/**
* Adjust the frame size to make the average bit rate match the target bit rate.
* This is only needed for 11025, 22050, and 44100 sample rates.
/**
* Deinterleave input samples.
- * Channels are reordered from FFmpeg's default order to AC-3 order.
+ * Channels are reordered from Libav's default order to AC-3 order.
*/
static void deinterleave_input_samples(AC3EncodeContext *s,
const SampleType *samples)
apply_window(&s->dsp, s->windowed_samples, input_samples, s->mdct.window, AC3_WINDOW_SIZE);
- block->exp_shift[ch] = normalize_samples(s);
+ 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;
- 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]);
- s->blocks[0].new_rematrixing_strategy = 1;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
block = &s->blocks[blk];
- for (bnd = 0; bnd < 4; bnd++) {
+ 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 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
CoefType rt = block->mdct_coef[1][i];
CoefType md = lt + rt;
CoefType sd = lt - rt;
- sum[0] += lt * lt;
- sum[1] += rt * rt;
- sum[2] += md * md;
- sum[3] += sd * sd;
+ MAC_COEF(sum[0], lt, lt);
+ MAC_COEF(sum[1], rt, rt);
+ MAC_COEF(sum[2], md, md);
+ MAC_COEF(sum[3], sd, sd);
}
/* compare sums to determine if rematrixing will be used for this band */
/* determine if new rematrixing flags will be sent */
if (blk &&
- !block->new_rematrixing_strategy &&
block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
block->new_rematrixing_strategy = 1;
}
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]);
AC3Block *block = &s->blocks[blk];
if (block->new_rematrixing_strategy)
flags = block->rematrixing_flags;
- for (bnd = 0; bnd < 4; bnd++) {
+ for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++) {
if (flags[bnd]) {
start = ff_ac3_rematrix_band_tab[bnd];
end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+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];
- int exp_shift = block->exp_shift[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) + exp_shift;
- if (e >= 24) {
- e = 24;
- coef[i] = 0;
- }
- }
- exp[i] = e;
- }
+ s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch],
+ AC3_MAX_COEFS);
}
}
}
exp_strategy[blk] = EXP_REUSE;
exp += AC3_MAX_COEFS;
}
- emms_c();
/* now select the encoding strategy type : if exponents are often
recoded, we use a coarse encoding */
}
-/**
- * Set each encoded exponent in a block to the minimum of itself and the
- * exponents in the same frequency bin of up to 5 following blocks.
- */
-static void exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
-{
- int blk, i;
-
- if (!num_reuse_blocks)
- return;
-
- for (i = 0; i < nb_coefs; i++) {
- uint8_t min_exp = *exp;
- uint8_t *exp1 = exp + AC3_MAX_COEFS;
- for (blk = 0; blk < num_reuse_blocks; blk++) {
- uint8_t next_exp = *exp1;
- if (next_exp < min_exp)
- min_exp = next_exp;
- exp1 += AC3_MAX_COEFS;
- }
- *exp++ = min_exp;
- }
-}
-
-
/**
* Update the exponents so that they are the ones the decoder will decode.
*/
static void encode_exponents(AC3EncodeContext *s)
{
int blk, blk1, ch;
- uint8_t *exp, *exp1, *exp_strategy;
+ uint8_t *exp, *exp_strategy;
int nb_coefs, num_reuse_blocks;
for (ch = 0; ch < s->channels; ch++) {
while (blk < AC3_MAX_BLOCKS) {
blk1 = blk + 1;
- /* count the number of EXP_REUSE blocks after the current block */
- while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE)
+ /* count the number of EXP_REUSE blocks after the current block
+ and set exponent reference block pointers */
+ s->blocks[blk].exp_ref_block[ch] = &s->blocks[blk];
+ while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE) {
+ s->blocks[blk1].exp_ref_block[ch] = &s->blocks[blk];
blk1++;
+ }
num_reuse_blocks = blk1 - blk - 1;
/* for the EXP_REUSE case we select the min of the exponents */
- exponent_min(exp, num_reuse_blocks, nb_coefs);
+ s->ac3dsp.ac3_exponent_min(exp, num_reuse_blocks, nb_coefs);
encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk]);
- /* copy encoded exponents for reuse case */
- exp1 = exp + AC3_MAX_COEFS;
- while (blk < blk1-1) {
- memcpy(exp1, exp, nb_coefs * sizeof(*exp));
- exp1 += AC3_MAX_COEFS;
- blk++;
- }
+ exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
blk = blk1;
- exp = exp1;
}
}
}
exp1 = p[0];
p += group_size;
delta0 = exp1 - exp0 + 2;
+ av_assert2(delta0 >= 0 && delta0 <= 4);
exp0 = exp1;
exp1 = p[0];
p += group_size;
delta1 = exp1 - exp0 + 2;
+ av_assert2(delta1 >= 0 && delta1 <= 4);
exp0 = exp1;
exp1 = p[0];
p += group_size;
delta2 = exp1 - exp0 + 2;
+ av_assert2(delta2 >= 0 && delta2 <= 4);
block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
}
encode_exponents(s);
group_exponents(s);
+
+ emms_c();
}
s->fast_decay_code = 1;
s->slow_gain_code = 1;
s->db_per_bit_code = 3;
- s->floor_code = 4;
+ s->floor_code = 7;
for (ch = 0; ch < s->channels; ch++)
s->fast_gain_code[ch] = 4;
*/
static void count_frame_bits(AC3EncodeContext *s)
{
+ AC3EncOptions *opt = &s->options;
int blk, ch;
int frame_bits = 0;
+ if (opt->audio_production_info)
+ frame_bits += 7;
+ if (s->bitstream_id == 6) {
+ if (opt->extended_bsi_1)
+ frame_bits += 14;
+ if (opt->extended_bsi_2)
+ frame_bits += 14;
+ }
+
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 += 4;
+ frame_bits += s->num_rematrixing_bands;
}
for (ch = 0; ch < s->fbw_channels; ch++) {
}
-/**
- * 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;
-}
-
-
/**
* Finalize the mantissa bit count by adding in the grouped mantissas.
*/
mantissa_bits = 0;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
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. */
- if (s->exp_strategy[ch][blk] == EXP_REUSE) {
- memcpy(block->bap[ch], s->blocks[blk-1].bap[ch], AC3_MAX_COEFS);
- } else {
- 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]);
+ 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], 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);
snr_offset = s->coarse_snr_offset << 4;
*/
static inline int sym_quant(int c, int e, int levels)
{
- int v;
-
- if (c >= 0) {
- v = (levels * (c << e)) >> 24;
- v = (v + 1) >> 1;
- v = (levels >> 1) + v;
- } else {
- v = (levels * ((-c) << e)) >> 24;
- v = (v + 1) >> 1;
- v = (levels >> 1) - v;
- }
- assert(v >= 0 && v < levels);
+ int v = (((levels * c) >> (24 - e)) + levels) >> 1;
+ av_assert2(v >= 0 && v < levels);
return v;
}
m = (1 << (qbits-1));
if (v >= m)
v = m - 1;
- assert(v >= -m);
+ av_assert2(v >= -m);
return v & ((1 << qbits)-1);
}
/**
* 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,
- int8_t exp_shift, uint8_t *exp,
+static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
+ uint8_t *exp,
uint8_t *bap, uint16_t *qmant, int n)
{
int i;
for (i = 0; i < n; i++) {
int v;
int c = fixed_coef[i];
- int e = exp[i] - exp_shift;
+ int e = exp[i];
int b = bap[i];
switch (b) {
case 0:
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk];
- s->mant1_cnt = s->mant2_cnt = s->mant4_cnt = 0;
- s->qmant1_ptr = s->qmant2_ptr = s->qmant4_ptr = NULL;
+ AC3Block *ref_block;
+ AC3Mant m = { 0 };
for (ch = 0; ch < s->channels; ch++) {
- quantize_mantissas_blk_ch(s, block->fixed_coef[ch], block->exp_shift[ch],
- block->exp[ch], block->bap[ch],
+ 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->nb_coefs[ch]);
}
}
*/
static void output_frame_header(AC3EncodeContext *s)
{
+ AC3EncOptions *opt = &s->options;
+
put_bits(&s->pb, 16, 0x0b77); /* frame header */
put_bits(&s->pb, 16, 0); /* crc1: will be filled later */
put_bits(&s->pb, 2, s->bit_alloc.sr_code);
put_bits(&s->pb, 3, s->bitstream_mode);
put_bits(&s->pb, 3, s->channel_mode);
if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
- put_bits(&s->pb, 2, 1); /* XXX -4.5 dB */
+ put_bits(&s->pb, 2, s->center_mix_level);
if (s->channel_mode & 0x04)
- put_bits(&s->pb, 2, 1); /* XXX -6 dB */
+ put_bits(&s->pb, 2, s->surround_mix_level);
if (s->channel_mode == AC3_CHMODE_STEREO)
- put_bits(&s->pb, 2, 0); /* surround not indicated */
+ put_bits(&s->pb, 2, opt->dolby_surround_mode);
put_bits(&s->pb, 1, s->lfe_on); /* LFE */
- put_bits(&s->pb, 5, 31); /* dialog norm: -31 db */
+ put_bits(&s->pb, 5, -opt->dialogue_level);
put_bits(&s->pb, 1, 0); /* no compression control word */
put_bits(&s->pb, 1, 0); /* no lang code */
- put_bits(&s->pb, 1, 0); /* no audio production info */
- put_bits(&s->pb, 1, 0); /* no copyright */
- put_bits(&s->pb, 1, 1); /* original bitstream */
+ put_bits(&s->pb, 1, opt->audio_production_info);
+ if (opt->audio_production_info) {
+ put_bits(&s->pb, 5, opt->mixing_level - 80);
+ put_bits(&s->pb, 2, opt->room_type);
+ }
+ put_bits(&s->pb, 1, opt->copyright);
+ put_bits(&s->pb, 1, opt->original);
+ if (s->bitstream_id == 6) {
+ /* alternate bit stream syntax */
+ put_bits(&s->pb, 1, opt->extended_bsi_1);
+ if (opt->extended_bsi_1) {
+ put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
+ put_bits(&s->pb, 3, s->ltrt_center_mix_level);
+ put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
+ put_bits(&s->pb, 3, s->loro_center_mix_level);
+ put_bits(&s->pb, 3, s->loro_surround_mix_level);
+ }
+ put_bits(&s->pb, 1, opt->extended_bsi_2);
+ if (opt->extended_bsi_2) {
+ put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
+ put_bits(&s->pb, 2, opt->dolby_headphone_mode);
+ put_bits(&s->pb, 1, opt->ad_converter_type);
+ put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */
+ }
+ } else {
put_bits(&s->pb, 1, 0); /* no time code 1 */
put_bits(&s->pb, 1, 0); /* no time code 2 */
+ }
put_bits(&s->pb, 1, 0); /* no additional bit stream info */
}
put_bits(&s->pb, 1, block->new_rematrixing_strategy);
if (block->new_rematrixing_strategy) {
/* rematrixing flags */
- for (rbnd = 0; rbnd < 4; rbnd++)
+ for (rbnd = 0; rbnd < s->num_rematrixing_bands; rbnd++)
put_bits(&s->pb, 1, block->rematrixing_flags[rbnd]);
}
}
/* mantissas */
for (ch = 0; ch < s->channels; ch++) {
int b, q;
+ AC3Block *ref_block = block->exp_ref_block[ch];
for (i = 0; i < s->nb_coefs[ch]; i++) {
q = block->qmant[ch][i];
- b = block->bap[ch][i];
+ b = ref_block->bap[ch][i];
switch (b) {
case 0: break;
case 1: if (q != 128) put_bits(&s->pb, 5, q); break;
frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
/* pad the remainder of the frame with zeros */
+ av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18);
flush_put_bits(&s->pb);
frame = s->pb.buf;
pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2;
- assert(pad_bytes >= 0);
+ av_assert2(pad_bytes >= 0);
if (pad_bytes > 0)
memset(put_bits_ptr(&s->pb), 0, pad_bytes);
}
+static void dprint_options(AVCodecContext *avctx)
+{
+#ifdef DEBUG
+ AC3EncodeContext *s = avctx->priv_data;
+ AC3EncOptions *opt = &s->options;
+ 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;
+ default: snprintf(strbuf, 32, "ERROR");
+ }
+ av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
+ av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
+ av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout);
+ av_dlog(avctx, "channel_layout: %s\n", strbuf);
+ av_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
+ av_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
+ if (s->cutoff)
+ av_dlog(avctx, "cutoff: %d\n", s->cutoff);
+
+ av_dlog(avctx, "per_frame_metadata: %s\n",
+ opt->allow_per_frame_metadata?"on":"off");
+ if (s->has_center)
+ av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
+ s->center_mix_level);
+ else
+ av_dlog(avctx, "center_mixlev: {not written}\n");
+ if (s->has_surround)
+ av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
+ s->surround_mix_level);
+ else
+ av_dlog(avctx, "surround_mixlev: {not written}\n");
+ 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;
+ default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
+ }
+ av_dlog(avctx, "room_type: %s\n", strbuf);
+ } else {
+ av_dlog(avctx, "mixing_level: {not written}\n");
+ av_dlog(avctx, "room_type: {not written}\n");
+ }
+ av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
+ 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;
+ default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
+ }
+ av_dlog(avctx, "dsur_mode: %s\n", strbuf);
+ } else {
+ av_dlog(avctx, "dsur_mode: {not written}\n");
+ }
+ av_dlog(avctx, "original: %s\n", opt->original?"on":"off");
+
+ 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;
+ default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
+ }
+ av_dlog(avctx, "dmix_mode: %s\n", strbuf);
+ av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
+ opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
+ av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
+ opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
+ av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
+ opt->loro_center_mix_level, s->loro_center_mix_level);
+ av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
+ opt->loro_surround_mix_level, s->loro_surround_mix_level);
+ } else {
+ av_dlog(avctx, "extended bitstream info 1: {not written}\n");
+ }
+ 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;
+ 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;
+ 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;
+ default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
+ }
+ av_dlog(avctx, "ad_conv_type: %s\n", strbuf);
+ } else {
+ av_dlog(avctx, "extended bitstream info 2: {not written}\n");
+ }
+ }
+#endif
+}
+
+
+#define FLT_OPTION_THRESHOLD 0.01
+
+static int validate_float_option(float v, const float *v_list, int v_list_size)
+{
+ int i;
+
+ for (i = 0; i < v_list_size; i++) {
+ if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
+ v > (v_list[i] - FLT_OPTION_THRESHOLD))
+ break;
+ }
+ if (i == v_list_size)
+ return -1;
+
+ return i;
+}
+
+
+static void validate_mix_level(void *log_ctx, const char *opt_name,
+ float *opt_param, const float *list,
+ int list_size, int default_value, int min_value,
+ int *ctx_param)
+{
+ int mixlev = validate_float_option(*opt_param, list, list_size);
+ if (mixlev < min_value) {
+ mixlev = default_value;
+ if (*opt_param >= 0.0) {
+ av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
+ "default value: %0.3f\n", opt_name, list[mixlev]);
+ }
+ }
+ *opt_param = list[mixlev];
+ *ctx_param = mixlev;
+}
+
+
+/**
+ * Validate metadata options as set by AVOption system.
+ * These values can optionally be changed per-frame.
+ */
+static int validate_metadata(AVCodecContext *avctx)
+{
+ AC3EncodeContext *s = avctx->priv_data;
+ AC3EncOptions *opt = &s->options;
+
+ /* validate mixing levels */
+ if (s->has_center) {
+ validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
+ cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
+ &s->center_mix_level);
+ }
+ if (s->has_surround) {
+ validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
+ surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
+ &s->surround_mix_level);
+ }
+
+ /* set audio production info flag */
+ if (opt->mixing_level >= 0 || opt->room_type >= 0) {
+ if (opt->mixing_level < 0) {
+ av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
+ "room_type is set\n");
+ return AVERROR(EINVAL);
+ }
+ if (opt->mixing_level < 80) {
+ av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
+ "80dB and 111dB\n");
+ return AVERROR(EINVAL);
+ }
+ /* default room type */
+ if (opt->room_type < 0)
+ opt->room_type = 0;
+ opt->audio_production_info = 1;
+ } else {
+ opt->audio_production_info = 0;
+ }
+
+ /* set extended bsi 1 flag */
+ if ((s->has_center || s->has_surround) &&
+ (opt->preferred_stereo_downmix >= 0 ||
+ opt->ltrt_center_mix_level >= 0 ||
+ opt->ltrt_surround_mix_level >= 0 ||
+ opt->loro_center_mix_level >= 0 ||
+ opt->loro_surround_mix_level >= 0)) {
+ /* default preferred stereo downmix */
+ if (opt->preferred_stereo_downmix < 0)
+ opt->preferred_stereo_downmix = 0;
+ /* validate Lt/Rt center mix level */
+ validate_mix_level(avctx, "ltrt_center_mix_level",
+ &opt->ltrt_center_mix_level, extmixlev_options,
+ EXTMIXLEV_NUM_OPTIONS, 5, 0,
+ &s->ltrt_center_mix_level);
+ /* validate Lt/Rt surround mix level */
+ validate_mix_level(avctx, "ltrt_surround_mix_level",
+ &opt->ltrt_surround_mix_level, extmixlev_options,
+ EXTMIXLEV_NUM_OPTIONS, 6, 3,
+ &s->ltrt_surround_mix_level);
+ /* validate Lo/Ro center mix level */
+ validate_mix_level(avctx, "loro_center_mix_level",
+ &opt->loro_center_mix_level, extmixlev_options,
+ EXTMIXLEV_NUM_OPTIONS, 5, 0,
+ &s->loro_center_mix_level);
+ /* validate Lo/Ro surround mix level */
+ validate_mix_level(avctx, "loro_surround_mix_level",
+ &opt->loro_surround_mix_level, extmixlev_options,
+ EXTMIXLEV_NUM_OPTIONS, 6, 3,
+ &s->loro_surround_mix_level);
+ opt->extended_bsi_1 = 1;
+ } else {
+ opt->extended_bsi_1 = 0;
+ }
+
+ /* set extended bsi 2 flag */
+ if (opt->dolby_surround_ex_mode >= 0 ||
+ opt->dolby_headphone_mode >= 0 ||
+ opt->ad_converter_type >= 0) {
+ /* default dolby surround ex mode */
+ if (opt->dolby_surround_ex_mode < 0)
+ opt->dolby_surround_ex_mode = 0;
+ /* default dolby headphone mode */
+ if (opt->dolby_headphone_mode < 0)
+ opt->dolby_headphone_mode = 0;
+ /* default A/D converter type */
+ if (opt->ad_converter_type < 0)
+ opt->ad_converter_type = 0;
+ opt->extended_bsi_2 = 1;
+ } else {
+ opt->extended_bsi_2 = 0;
+ }
+
+ /* set bitstream id for alternate bitstream syntax */
+ if (opt->extended_bsi_1 || opt->extended_bsi_2) {
+ if (s->bitstream_id > 8 && s->bitstream_id < 11) {
+ static int warn_once = 1;
+ if (warn_once) {
+ av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is "
+ "not compatible with reduced samplerates. writing of "
+ "extended bitstream information will be disabled.\n");
+ warn_once = 0;
+ }
+ } else {
+ s->bitstream_id = 6;
+ }
+ }
+
+ return 0;
+}
+
+
/**
* Encode a single AC-3 frame.
*/
const SampleType *samples = data;
int ret;
+ if (s->options.allow_per_frame_metadata) {
+ ret = validate_metadata(avctx);
+ if (ret)
+ return ret;
+ }
+
if (s->bit_alloc.sr_code == 1)
adjust_frame_size(s);
apply_mdct(s);
- compute_rematrixing_strategy(s);
-
scale_coefficients(s);
+ compute_rematrixing_strategy(s);
+
apply_rematrixing(s);
process_exponents(s);
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;
default:
return AVERROR(EINVAL);
}
+ s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
+ s->has_surround = s->channel_mode & 0x04;
s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on];
*channel_layout = ch_layout;
s->sample_rate = avctx->sample_rate;
s->bit_alloc.sr_shift = i % 3;
s->bit_alloc.sr_code = i / 3;
+ s->bitstream_id = 8 + s->bit_alloc.sr_shift;
/* validate bit rate */
for (i = 0; i < 19; i++) {
if (s->cutoff > (s->sample_rate >> 1))
s->cutoff = s->sample_rate >> 1;
+ /* validate audio service type / channels combination */
+ if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
+ avctx->channels == 1) ||
+ ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
+ avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
+ avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
+ && avctx->channels > 1)) {
+ av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
+ "specified number of channels\n");
+ return AVERROR(EINVAL);
+ }
+
+ ret = validate_metadata(avctx);
+ if (ret)
+ return ret;
+
+ s->rematrixing_enabled = s->options.stereo_rematrixing &&
+ (s->channel_mode == AC3_CHMODE_STEREO);
+
return 0;
}
bw_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;
+ bw_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 */
if (ret)
return ret;
- s->bitstream_id = 8 + s->bit_alloc.sr_shift;
- s->bitstream_mode = 0; /* complete main audio service */
+ s->bitstream_mode = avctx->audio_service_type;
+ if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
+ s->bitstream_mode = 0x7;
s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
s->bits_written = 0;
set_bandwidth(s);
- rematrixing_init(s);
-
exponent_init(s);
bit_alloc_init(s);
avctx->coded_frame= avcodec_alloc_frame();
dsputil_init(&s->dsp, avctx);
+ ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
+
+ dprint_options(avctx);
return 0;
init_fail: