/src/ffmpeg/libavcodec/ac3enc_template.c

Source
/*
 * AC-3 encoder float/fixed template
 * Copyright (c) 2000 Fabrice Bellard
 * Copyright (c) 2006-2011 Justin Ruggles <justin.ruggles@gmail.com>
 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
 *
 * This file is part of FFmpeg.
 *
 * 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.
 *
 * 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * AC-3 encoder float/fixed template
 */

#include "config_components.h"

#include <stdint.h>

#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/mem_internal.h"

#include "audiodsp.h"
#include "ac3enc.h"
#include "eac3enc.h"

#if AC3ENC_FLOAT
#define RENAME(element) element ## _float
#else
#define RENAME(element) element ## _fixed
#endif

/*
 * Apply the MDCT to input samples to generate frequency coefficients.
 * This applies the KBD window and normalizes the input to reduce precision
 * loss due to fixed-point calculations.
 */
static void apply_mdct(AC3EncodeContext *s, uint8_t * const *samples)
{
    av_assert1(s->num_blocks > 0);

    for (int ch = 0; ch < s->channels; ch++) {
        const SampleType *input_samples0 = (const SampleType*)s->planar_samples[ch];
        /* Reorder channels from native order to AC-3 order. */
        const SampleType *input_samples1 = (const SampleType*)samples[s->channel_map[ch]];
        int blk = 0;

        do {
            AC3Block *block = &s->blocks[blk];
            SampleType *windowed_samples = s->RENAME(windowed_samples);

            s->fdsp->vector_fmul(windowed_samples, input_samples0,
                                 s->RENAME(mdct_window), AC3_BLOCK_SIZE);
            s->fdsp->vector_fmul_reverse(windowed_samples + AC3_BLOCK_SIZE,
                                         input_samples1,
                                         s->RENAME(mdct_window), AC3_BLOCK_SIZE);

            s->tx_fn(s->tx, block->mdct_coef[ch+1],
                     windowed_samples, sizeof(*windowed_samples));
            input_samples0  = input_samples1;
            input_samples1 += AC3_BLOCK_SIZE;
        } while (++blk < s->num_blocks);

        /* Store last 256 samples of current frame */
        memcpy(s->planar_samples[ch], input_samples0,
               AC3_BLOCK_SIZE * sizeof(*input_samples0));
    }
}


/*
 * Calculate coupling channel and coupling coordinates.
 */
static void apply_channel_coupling(AC3EncodeContext *s)
{
    LOCAL_ALIGNED_32(CoefType, cpl_coords,      [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
#if AC3ENC_FLOAT
    LOCAL_ALIGNED_32(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 av_uninit(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));
#if 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 */
    cpl_start     = s->start_freq[CPL_CH] - 1;
    num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32);
    cpl_start     = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs;

    /* calculate coupling channel from fbw channels */
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block = &s->blocks[blk];
        CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start];
        if (!block->cpl_in_use)
            continue;
        memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef));
        for (ch = 1; ch <= s->fbw_channels; ch++) {
            CoefType *ch_coef = &block->mdct_coef[ch][cpl_start];
            if (!block->channel_in_cpl[ch])
                continue;
            for (i = 0; i < num_cpl_coefs; i++)
                cpl_coef[i] += ch_coef[i];
        }

        /* coefficients must be clipped in order to be encoded */
        clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs);
    }

    /* calculate energy in each band in coupling channel and each fbw channel */
    /* TODO: possibly use SIMD to speed up energy calculation */
    bnd = 0;
    i = s->start_freq[CPL_CH];
    while (i < s->cpl_end_freq) {
        int band_size = s->cpl_band_sizes[bnd];
        for (ch = CPL_CH; ch <= s->fbw_channels; ch++) {
            for (blk = 0; blk < s->num_blocks; blk++) {
                AC3Block *block = &s->blocks[blk];
                if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch]))
                    continue;
                for (j = 0; j < band_size; j++) {
                    CoefType v = block->mdct_coef[ch][i+j];
                    MAC_COEF(energy[blk][ch][bnd], v, v);
                }
            }
        }
        i += band_size;
        bnd++;
    }

    /* calculate coupling coordinates for all blocks for all channels */
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block  = &s->blocks[blk];
        if (!block->cpl_in_use)
            continue;
        for (ch = 1; ch <= s->fbw_channels; ch++) {
            if (!block->channel_in_cpl[ch])
                continue;
            for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
                cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd],
                                                          energy[blk][CPL_CH][bnd]);
            }
        }
    }

    /* determine which blocks to send new coupling coordinates for */
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block  = &s->blocks[blk];
        AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL;

        memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords));

        if (block->cpl_in_use) {
            /* send new coordinates if this is the first block, if previous
             * block did not use coupling but this block does, the channels
             * using coupling has changed from the previous block, or the
             * coordinate difference from the last block for any channel is
             * greater than a threshold value. */
            if (blk == 0 || !block0->cpl_in_use) {
                for (ch = 1; ch <= s->fbw_channels; ch++)
                    block->new_cpl_coords[ch] = 1;
            } else {
                for (ch = 1; ch <= s->fbw_channels; ch++) {
                    if (!block->channel_in_cpl[ch])
                        continue;
                    if (!block0->channel_in_cpl[ch]) {
                        block->new_cpl_coords[ch] = 1;
                    } else {
                        CoefSumType coord_diff = 0;
                        for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
                            coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] -
                                                cpl_coords[blk  ][ch][bnd]);
                        }
                        coord_diff /= s->num_cpl_bands;
                        if (coord_diff > NEW_CPL_COORD_THRESHOLD)
                            block->new_cpl_coords[ch] = 1;
                    }
                }
            }
        }
    }

    av_assert1(s->fbw_channels > 0);

    /* calculate final coupling coordinates, taking into account reusing of
       coordinates in successive blocks */
    for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
        blk = 0;
        while (blk < s->num_blocks) {
            int av_uninit(blk1);
            AC3Block *block  = &s->blocks[blk];

            if (!block->cpl_in_use) {
                blk++;
                continue;
            }

            for (ch = 1; ch <= s->fbw_channels; ch++) {
                CoefSumType energy_ch, energy_cpl;
                if (!block->channel_in_cpl[ch])
                    continue;
                energy_cpl = energy[blk][CPL_CH][bnd];
                energy_ch = energy[blk][ch][bnd];
                blk1 = blk+1;
                while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) {
                    if (s->blocks[blk1].cpl_in_use) {
                        energy_cpl += energy[blk1][CPL_CH][bnd];
                        energy_ch += energy[blk1][ch][bnd];
                    }
                    blk1++;
                }
                cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl);
            }
            blk = blk1;
        }
    }

    /* calculate exponents/mantissas for coupling coordinates */
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block = &s->blocks[blk];
        if (!block->cpl_in_use)
            continue;

#if 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);

        for (ch = 1; ch <= s->fbw_channels; ch++) {
            int bnd, min_exp, max_exp, master_exp;

            if (!block->new_cpl_coords[ch])
                continue;

            /* determine master exponent */
            min_exp = max_exp = block->cpl_coord_exp[ch][0];
            for (bnd = 1; bnd < s->num_cpl_bands; bnd++) {
                int exp = block->cpl_coord_exp[ch][bnd];
                min_exp = FFMIN(exp, min_exp);
                max_exp = FFMAX(exp, max_exp);
            }
            master_exp = ((max_exp - 15) + 2) / 3;
            master_exp = FFMAX(master_exp, 0);
            while (min_exp < master_exp * 3)
                master_exp--;
            for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
                block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] -
                                                        master_exp * 3, 0, 15);
            }
            block->cpl_master_exp[ch] = master_exp;

            /* quantize mantissas */
            for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
                int cpl_exp  = block->cpl_coord_exp[ch][bnd];
                int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24;
                if (cpl_exp == 15)
                    cpl_mant >>= 1;
                else
                    cpl_mant -= 16;

                block->cpl_coord_mant[ch][bnd] = cpl_mant;
            }
        }
    }

    if (AC3ENC_FLOAT && CONFIG_EAC3_ENCODER && s->eac3)
        ff_eac3_set_cpl_states(s);
}


/*
 * Determine rematrixing flags for each block and band.
 */
static void compute_rematrixing_strategy(AC3EncodeContext *s)
{
    int nb_coefs;
    int blk, bnd;
    AC3Block *block, *block0 = NULL;

    if (s->channel_mode != AC3_CHMODE_STEREO)
        return;

    for (blk = 0; blk < s->num_blocks; blk++) {
        block = &s->blocks[blk];
        block->new_rematrixing_strategy = !blk;

        block->num_rematrixing_bands = 4;
        if (block->cpl_in_use) {
            block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61);
            block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37);
            if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands)
                block->new_rematrixing_strategy = 1;
        }
        nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);

        if (!s->rematrixing_enabled) {
            block0 = block;
            continue;
        }

        for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
            /* 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]);
            CoefSumType sum[4];
            sum_square_butterfly(s, sum, block->mdct_coef[1] + start,
                                 block->mdct_coef[2] + start, end - start);

            /* compare sums to determine if rematrixing will be used for this band */
            if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
                block->rematrixing_flags[bnd] = 1;
            else
                block->rematrixing_flags[bnd] = 0;

            /* determine if new rematrixing flags will be sent */
            if (blk &&
                block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
                block->new_rematrixing_strategy = 1;
            }
        }
        block0 = block;
    }
}


static void encode_frame(AC3EncodeContext *s, uint8_t * const *samples)
{
    apply_mdct(s, samples);

    s->cpl_on = s->cpl_enabled;
    ff_ac3_compute_coupling_strategy(s);

    if (s->cpl_on)
        apply_channel_coupling(s);

    compute_rematrixing_strategy(s);

#if AC3ENC_FLOAT
    scale_coefficients(s);
#endif
}

Coverage Report

Created: 2025-12-31 07:57

Line	Count	Source
1		/*
2		* AC-3 encoder float/fixed template
3		* Copyright (c) 2000 Fabrice Bellard
4		* Copyright (c) 2006-2011 Justin Ruggles <justin.ruggles@gmail.com>
5		* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
6		*
7		* This file is part of FFmpeg.
8		*
9		* FFmpeg is free software; you can redistribute it and/or
10		* modify it under the terms of the GNU Lesser General Public
11		* License as published by the Free Software Foundation; either
12		* version 2.1 of the License, or (at your option) any later version.
13		*
14		* FFmpeg is distributed in the hope that it will be useful,
15		* but WITHOUT ANY WARRANTY; without even the implied warranty of
16		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17		* Lesser General Public License for more details.
18		*
19		* You should have received a copy of the GNU Lesser General Public
20		* License along with FFmpeg; if not, write to the Free Software
21		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22		*/
23
24		/**
25		* @file
26		* AC-3 encoder float/fixed template
27		*/
28
29		#include "config_components.h"
30
31		#include <stdint.h>
32
33		#include "libavutil/attributes.h"
34		#include "libavutil/avassert.h"
35		#include "libavutil/mem_internal.h"
36
37		#include "audiodsp.h"
38		#include "ac3enc.h"
39		#include "eac3enc.h"
40
41		#if AC3ENC_FLOAT
42	0	#define RENAME(element) element ## _float
43		#else
44	0	#define RENAME(element) element ## _fixed
45		#endif
46
47		/*
48		* Apply the MDCT to input samples to generate frequency coefficients.
49		* This applies the KBD window and normalizes the input to reduce precision
50		* loss due to fixed-point calculations.
51		*/
52		static void apply_mdct(AC3EncodeContext s, uint8_t const *samples)
53	0	{
54	0	av_assert1(s->num_blocks > 0);
55
56	0	for (int ch = 0; ch < s->channels; ch++) {
57	0	const SampleType input_samples0 = (const SampleType)s->planar_samples[ch];
58		/* Reorder channels from native order to AC-3 order. */
59	0	const SampleType input_samples1 = (const SampleType)samples[s->channel_map[ch]];
60	0	int blk = 0;
61
62	0	do {
63	0	AC3Block *block = &s->blocks[blk];
64	0	SampleType *windowed_samples = s->RENAME(windowed_samples);
65
66	0	s->fdsp->vector_fmul(windowed_samples, input_samples0,
67	0	s->RENAME(mdct_window), AC3_BLOCK_SIZE);
68	0	s->fdsp->vector_fmul_reverse(windowed_samples + AC3_BLOCK_SIZE,
69	0	input_samples1,
70	0	s->RENAME(mdct_window), AC3_BLOCK_SIZE);
71
72	0	s->tx_fn(s->tx, block->mdct_coef[ch+1],
73	0	windowed_samples, sizeof(*windowed_samples));
74	0	input_samples0 = input_samples1;
75	0	input_samples1 += AC3_BLOCK_SIZE;
76	0	} while (++blk < s->num_blocks);
77
78		/* Store last 256 samples of current frame */
79	0	memcpy(s->planar_samples[ch], input_samples0,
80	0	AC3_BLOCK_SIZE * sizeof(*input_samples0));
81	0	}
82	0	} Unexecuted instantiation: ac3enc_float.c:apply_mdct Unexecuted instantiation: ac3enc_fixed.c:apply_mdct
83
84
85		/*
86		* Calculate coupling channel and coupling coordinates.
87		*/
88		static void apply_channel_coupling(AC3EncodeContext *s)
89	0	{
90	0	LOCAL_ALIGNED_32(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
91		#if AC3ENC_FLOAT
92	0	LOCAL_ALIGNED_32(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
93		#else
94		int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords;
95		#endif
96	0	int av_uninit(blk), ch, bnd, i, j;
97	0	CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
98	0	int cpl_start, num_cpl_coefs;
99
100	0	memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
101		#if AC3ENC_FLOAT
102	0	memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
103		#endif
104
105		/* align start to 16-byte boundary. align length to multiple of 32.
106		note: coupling start bin % 4 will always be 1 */
107	0	cpl_start = s->start_freq[CPL_CH] - 1;
108	0	num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32);
109	0	cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs;
110
111		/* calculate coupling channel from fbw channels */
112	0	for (blk = 0; blk < s->num_blocks; blk++) {
113	0	AC3Block *block = &s->blocks[blk];
114	0	CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start];
115	0	if (!block->cpl_in_use)
116	0	continue;
117	0	memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef));
118	0	for (ch = 1; ch <= s->fbw_channels; ch++) {
119	0	CoefType *ch_coef = &block->mdct_coef[ch][cpl_start];
120	0	if (!block->channel_in_cpl[ch])
121	0	continue;
122	0	for (i = 0; i < num_cpl_coefs; i++)
123	0	cpl_coef[i] += ch_coef[i];
124	0	}
125
126		/* coefficients must be clipped in order to be encoded */
127	0	clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs);
128	0	}
129
130		/* calculate energy in each band in coupling channel and each fbw channel */
131		/* TODO: possibly use SIMD to speed up energy calculation */
132	0	bnd = 0;
133	0	i = s->start_freq[CPL_CH];
134	0	while (i < s->cpl_end_freq) {
135	0	int band_size = s->cpl_band_sizes[bnd];
136	0	for (ch = CPL_CH; ch <= s->fbw_channels; ch++) {
137	0	for (blk = 0; blk < s->num_blocks; blk++) {
138	0	AC3Block *block = &s->blocks[blk];
139	0	if (!block->cpl_in_use \|\| (ch > CPL_CH && !block->channel_in_cpl[ch]))
140	0	continue;
141	0	for (j = 0; j < band_size; j++) {
142	0	CoefType v = block->mdct_coef[ch][i+j];
143	0	MAC_COEF(energy[blk][ch][bnd], v, v);
144	0	}
145	0	}
146	0	}
147	0	i += band_size;
148	0	bnd++;
149	0	}
150
151		/* calculate coupling coordinates for all blocks for all channels */
152	0	for (blk = 0; blk < s->num_blocks; blk++) {
153	0	AC3Block *block = &s->blocks[blk];
154	0	if (!block->cpl_in_use)
155	0	continue;
156	0	for (ch = 1; ch <= s->fbw_channels; ch++) {
157	0	if (!block->channel_in_cpl[ch])
158	0	continue;
159	0	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
160	0	cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd],
161	0	energy[blk][CPL_CH][bnd]);
162	0	}
163	0	}
164	0	}
165
166		/* determine which blocks to send new coupling coordinates for */
167	0	for (blk = 0; blk < s->num_blocks; blk++) {
168	0	AC3Block *block = &s->blocks[blk];
169	0	AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL;
170
171	0	memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords));
172
173	0	if (block->cpl_in_use) {
174		/* send new coordinates if this is the first block, if previous
175		* block did not use coupling but this block does, the channels
176		* using coupling has changed from the previous block, or the
177		* coordinate difference from the last block for any channel is
178		* greater than a threshold value. */
179	0	if (blk == 0 \|\| !block0->cpl_in_use) {
180	0	for (ch = 1; ch <= s->fbw_channels; ch++)
181	0	block->new_cpl_coords[ch] = 1;
182	0	} else {
183	0	for (ch = 1; ch <= s->fbw_channels; ch++) {
184	0	if (!block->channel_in_cpl[ch])
185	0	continue;
186	0	if (!block0->channel_in_cpl[ch]) {
187	0	block->new_cpl_coords[ch] = 1;
188	0	} else {
189	0	CoefSumType coord_diff = 0;
190	0	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
191	0	coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] -
192	0	cpl_coords[blk ][ch][bnd]);
193	0	}
194	0	coord_diff /= s->num_cpl_bands;
195	0	if (coord_diff > NEW_CPL_COORD_THRESHOLD)
196	0	block->new_cpl_coords[ch] = 1;
197	0	}
198	0	}
199	0	}
200	0	}
201	0	}
202
203	0	av_assert1(s->fbw_channels > 0);
204
205		/* calculate final coupling coordinates, taking into account reusing of
206		coordinates in successive blocks */
207	0	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
208	0	blk = 0;
209	0	while (blk < s->num_blocks) {
210	0	int av_uninit(blk1);
211	0	AC3Block *block = &s->blocks[blk];
212
213	0	if (!block->cpl_in_use) {
214	0	blk++;
215	0	continue;
216	0	}
217
218	0	for (ch = 1; ch <= s->fbw_channels; ch++) {
219	0	CoefSumType energy_ch, energy_cpl;
220	0	if (!block->channel_in_cpl[ch])
221	0	continue;
222	0	energy_cpl = energy[blk][CPL_CH][bnd];
223	0	energy_ch = energy[blk][ch][bnd];
224	0	blk1 = blk+1;
225	0	while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) {
226	0	if (s->blocks[blk1].cpl_in_use) {
227	0	energy_cpl += energy[blk1][CPL_CH][bnd];
228	0	energy_ch += energy[blk1][ch][bnd];
229	0	}
230	0	blk1++;
231	0	}
232	0	cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl);
233	0	}
234	0	blk = blk1;
235	0	}
236	0	}
237
238		/* calculate exponents/mantissas for coupling coordinates */
239	0	for (blk = 0; blk < s->num_blocks; blk++) {
240	0	AC3Block *block = &s->blocks[blk];
241	0	if (!block->cpl_in_use)
242	0	continue;
243
244		#if AC3ENC_FLOAT
245	0	s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
246	0	cpl_coords[blk][1],
247	0	s->fbw_channels * 16);
248	0	#endif
249	0	s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
250	0	fixed_cpl_coords[blk][1],
251	0	s->fbw_channels * 16);
252
253	0	for (ch = 1; ch <= s->fbw_channels; ch++) {
254	0	int bnd, min_exp, max_exp, master_exp;
255
256	0	if (!block->new_cpl_coords[ch])
257	0	continue;
258
259		/* determine master exponent */
260	0	min_exp = max_exp = block->cpl_coord_exp[ch][0];
261	0	for (bnd = 1; bnd < s->num_cpl_bands; bnd++) {
262	0	int exp = block->cpl_coord_exp[ch][bnd];
263	0	min_exp = FFMIN(exp, min_exp);
264	0	max_exp = FFMAX(exp, max_exp);
265	0	}
266	0	master_exp = ((max_exp - 15) + 2) / 3;
267	0	master_exp = FFMAX(master_exp, 0);
268	0	while (min_exp < master_exp * 3)
269	0	master_exp--;
270	0	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
271	0	block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] -
272	0	master_exp * 3, 0, 15);
273	0	}
274	0	block->cpl_master_exp[ch] = master_exp;
275
276		/* quantize mantissas */
277	0	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
278	0	int cpl_exp = block->cpl_coord_exp[ch][bnd];
279	0	int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24;
280	0	if (cpl_exp == 15)
281	0	cpl_mant >>= 1;
282	0	else
283	0	cpl_mant -= 16;
284
285	0	block->cpl_coord_mant[ch][bnd] = cpl_mant;
286	0	}
287	0	}
288	0	}
289
290	0	if (AC3ENC_FLOAT && CONFIG_EAC3_ENCODER && s->eac3)
291	0	ff_eac3_set_cpl_states(s);
292	0	} Unexecuted instantiation: ac3enc_float.c:apply_channel_coupling Unexecuted instantiation: ac3enc_fixed.c:apply_channel_coupling
293
294
295		/*
296		* Determine rematrixing flags for each block and band.
297		*/
298		static void compute_rematrixing_strategy(AC3EncodeContext *s)
299	0	{
300	0	int nb_coefs;
301	0	int blk, bnd;
302	0	AC3Block block, block0 = NULL;
303
304	0	if (s->channel_mode != AC3_CHMODE_STEREO)
305	0	return;
306
307	0	for (blk = 0; blk < s->num_blocks; blk++) {
308	0	block = &s->blocks[blk];
309	0	block->new_rematrixing_strategy = !blk;
310
311	0	block->num_rematrixing_bands = 4;
312	0	if (block->cpl_in_use) {
313	0	block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61);
314	0	block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37);
315	0	if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands)
316	0	block->new_rematrixing_strategy = 1;
317	0	}
318	0	nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
319
320	0	if (!s->rematrixing_enabled) {
321	0	block0 = block;
322	0	continue;
323	0	}
324
325	0	for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
326		/* calculate sum of squared coeffs for one band in one block */
327	0	int start = ff_ac3_rematrix_band_tab[bnd];
328	0	int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
329	0	CoefSumType sum[4];
330	0	sum_square_butterfly(s, sum, block->mdct_coef[1] + start,
331	0	block->mdct_coef[2] + start, end - start);
332
333		/* compare sums to determine if rematrixing will be used for this band */
334	0	if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
335	0	block->rematrixing_flags[bnd] = 1;
336	0	else
337	0	block->rematrixing_flags[bnd] = 0;
338
339		/* determine if new rematrixing flags will be sent */
340	0	if (blk &&
341	0	block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
342	0	block->new_rematrixing_strategy = 1;
343	0	}
344	0	}
345	0	block0 = block;
346	0	}
347	0	} Unexecuted instantiation: ac3enc_float.c:compute_rematrixing_strategy Unexecuted instantiation: ac3enc_fixed.c:compute_rematrixing_strategy
348
349
350		static void encode_frame(AC3EncodeContext s, uint8_t const *samples)
351	0	{
352	0	apply_mdct(s, samples);
353
354	0	s->cpl_on = s->cpl_enabled;
355	0	ff_ac3_compute_coupling_strategy(s);
356
357	0	if (s->cpl_on)
358	0	apply_channel_coupling(s);
359
360	0	compute_rematrixing_strategy(s);
361
362		#if AC3ENC_FLOAT
363		scale_coefficients(s);
364		#endif
365	0	} Unexecuted instantiation: ac3enc_float.c:encode_frame Unexecuted instantiation: ac3enc_fixed.c:encode_frame