Head

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/ac3enc_template.c	Lines:	193	217	88.9 %
Date:	2019-11-22 03:34:36	Branches:	122	154	79.2 %


/*
 * 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 <stdint.h>

#include "libavutil/attributes.h"
#include "libavutil/internal.h"

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


int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s)
{
    int ch;

    FF_ALLOC_OR_GOTO(s->avctx, s->windowed_samples, AC3_WINDOW_SIZE *
                     sizeof(*s->windowed_samples), alloc_fail);
    FF_ALLOC_ARRAY_OR_GOTO(s->avctx, s->planar_samples, s->channels, sizeof(*s->planar_samples),
                     alloc_fail);
    for (ch = 0; ch < s->channels; ch++) {
        FF_ALLOCZ_OR_GOTO(s->avctx, s->planar_samples[ch],
                          (AC3_FRAME_SIZE+AC3_BLOCK_SIZE) * sizeof(**s->planar_samples),
                          alloc_fail);
    }

    return 0;
alloc_fail:
    return AVERROR(ENOMEM);
}


/*
 * Copy input samples.
 * Channels are reordered from FFmpeg's default order to AC-3 order.
 */
static void copy_input_samples(AC3EncodeContext *s, SampleType **samples)
{
    int ch;

    /* copy and remap input samples */
    for (ch = 0; ch < s->channels; ch++) {
        /* copy last 256 samples of previous frame to the start of the current frame */
        memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks],
               AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));

        /* copy new samples for current frame */
        memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE],
               samples[s->channel_map[ch]],
               AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0]));
    }
}


/*
 * 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)
{
    int blk, ch;

    for (ch = 0; ch < s->channels; ch++) {
        for (blk = 0; blk < s->num_blocks; blk++) {
            AC3Block *block = &s->blocks[blk];
            const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE];

#if CONFIG_AC3ENC_FLOAT
            s->fdsp->vector_fmul(s->windowed_samples, input_samples,
                                s->mdct_window, AC3_WINDOW_SIZE);
#else
            s->ac3dsp.apply_window_int16(s->windowed_samples, input_samples,
                                         s->mdct_window, AC3_WINDOW_SIZE);

            if (s->fixed_point)
                block->coeff_shift[ch+1] = normalize_samples(s);
#endif

            s->mdct.mdct_calcw(&s->mdct, block->mdct_coef[ch+1],
                               s->windowed_samples);
        }
    }
}


/*
 * Calculate coupling channel and coupling coordinates.
 */
static void apply_channel_coupling(AC3EncodeContext *s)
{
    LOCAL_ALIGNED_16(CoefType, cpl_coords,      [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
#if CONFIG_AC3ENC_FLOAT
    LOCAL_ALIGNED_16(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 CONFIG_AC3ENC_FLOAT
    memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
#endif

    /* align start to 16-byte boundary. align length to multiple of 32.
        note: coupling start bin % 4 will always be 1 */
    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;
                    }
                }
            }
        }
    }

    /* 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 CONFIG_AC3ENC_FLOAT
        s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
                                   cpl_coords[blk][1],
                                   s->fbw_channels * 16);
#endif
        s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
                                    fixed_cpl_coords[blk][1],
                                    s->fbw_channels * 16);

        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 (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;
    }
}


int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt,
                           const AVFrame *frame, int *got_packet_ptr)
{
    AC3EncodeContext *s = avctx->priv_data;
    int ret;

    if (s->options.allow_per_frame_metadata) {
        ret = ff_ac3_validate_metadata(s);
        if (ret)
            return ret;
    }

    if (s->bit_alloc.sr_code == 1 || s->eac3)
        ff_ac3_adjust_frame_size(s);

    copy_input_samples(s, (SampleType **)frame->extended_data);

    apply_mdct(s);

    if (s->fixed_point)
        scale_coefficients(s);

    clip_coefficients(&s->adsp, s->blocks[0].mdct_coef[1],
                      AC3_MAX_COEFS * s->num_blocks * s->channels);

    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 (!s->fixed_point)
        scale_coefficients(s);

    ff_ac3_apply_rematrixing(s);

    ff_ac3_process_exponents(s);

    ret = ff_ac3_compute_bit_allocation(s);
    if (ret) {
        av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
        return ret;
    }

    ff_ac3_group_exponents(s);

    ff_ac3_quantize_mantissas(s);

    if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size, 0)) < 0)
        return ret;
    ff_ac3_output_frame(s, avpkt->data);

    if (frame->pts != AV_NOPTS_VALUE)
        avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);

    *got_packet_ptr = 1;
    return 0;
}


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	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 <stdint.h>
30
31			#include "libavutil/attributes.h"
32			#include "libavutil/internal.h"
33
34			#include "audiodsp.h"
35			#include "internal.h"
36			#include "ac3enc.h"
37			#include "eac3enc.h"
38
39
40		6	int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s)
41			{
42			int ch;
43
44	✗✓	6	FF_ALLOC_OR_GOTO(s->avctx, s->windowed_samples, AC3_WINDOW_SIZE *
45			sizeof(*s->windowed_samples), alloc_fail);
46	✗✓	6	FF_ALLOC_ARRAY_OR_GOTO(s->avctx, s->planar_samples, s->channels, sizeof(*s->planar_samples),
47			alloc_fail);
48	✓✓	15	for (ch = 0; ch < s->channels; ch++) {
49	✗✓	9	FF_ALLOCZ_OR_GOTO(s->avctx, s->planar_samples[ch],
50			(AC3_FRAME_SIZE+AC3_BLOCK_SIZE) * sizeof(**s->planar_samples),
51			alloc_fail);
52			}
53
54		6	return 0;
55			alloc_fail:
56			return AVERROR(ENOMEM);
57			}
58
59
60			/*
61			* Copy input samples.
62			* Channels are reordered from FFmpeg's default order to AC-3 order.
63			*/
64		1097	static void copy_input_samples(AC3EncodeContext s, SampleType *samples)
65			{
66			int ch;
67
68			/* copy and remap input samples */
69	✓✓	2913	for (ch = 0; ch < s->channels; ch++) {
70			/* copy last 256 samples of previous frame to the start of the current frame */
71		1816	memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks],
72			AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));
73
74			/* copy new samples for current frame */
75		1816	memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE],
76		1816	samples[s->channel_map[ch]],
77		1816	AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0]));
78			}
79		1097	}
80
81
82			/*
83			* Apply the MDCT to input samples to generate frequency coefficients.
84			* This applies the KBD window and normalizes the input to reduce precision
85			* loss due to fixed-point calculations.
86			*/
87		1097	static void apply_mdct(AC3EncodeContext *s)
88			{
89			int blk, ch;
90
91	✓✓	2913	for (ch = 0; ch < s->channels; ch++) {
92	✓✓	12712	for (blk = 0; blk < s->num_blocks; blk++) {
93		10896	AC3Block *block = &s->blocks[blk];
94		10896	const SampleType input_samples = &s->planar_samples[ch][blk AC3_BLOCK_SIZE];
95
96			#if CONFIG_AC3ENC_FLOAT
97		6552	s->fdsp->vector_fmul(s->windowed_samples, input_samples,
98		6552	s->mdct_window, AC3_WINDOW_SIZE);
99			#else
100		4344	s->ac3dsp.apply_window_int16(s->windowed_samples, input_samples,
101		4344	s->mdct_window, AC3_WINDOW_SIZE);
102
103	✓✗	4344	if (s->fixed_point)
104		4344	block->coeff_shift[ch+1] = normalize_samples(s);
105			#endif
106
107		10896	s->mdct.mdct_calcw(&s->mdct, block->mdct_coef[ch+1],
108		10896	s->windowed_samples);
109			}
110			}
111		1097	}
112
113
114			/*
115			* Calculate coupling channel and coupling coordinates.
116			*/
117		719	static void apply_channel_coupling(AC3EncodeContext *s)
118			{
119		719	LOCAL_ALIGNED_16(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
120			#if CONFIG_AC3ENC_FLOAT
121		546	LOCAL_ALIGNED_16(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
122			#else
123		173	int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords;
124			#endif
125		719	int av_uninit(blk), ch, bnd, i, j;
126		719	CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
127			int cpl_start, num_cpl_coefs;
128
129		719	memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
130			#if CONFIG_AC3ENC_FLOAT
131		546	memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
132			#endif
133
134			/* align start to 16-byte boundary. align length to multiple of 32.
135			note: coupling start bin % 4 will always be 1 */
136		719	cpl_start = s->start_freq[CPL_CH] - 1;
137		719	num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32);
138		719	cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs;
139
140			/* calculate coupling channel from fbw channels */
141	✓✓	5033	for (blk = 0; blk < s->num_blocks; blk++) {
142		4314	AC3Block *block = &s->blocks[blk];
143		4314	CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start];
144	✗✓	4314	if (!block->cpl_in_use)
145			continue;
146		4314	memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef));
147	✓✓	12942	for (ch = 1; ch <= s->fbw_channels; ch++) {
148		8628	CoefType *ch_coef = &block->mdct_coef[ch][cpl_start];
149	✗✓	8628	if (!block->channel_in_cpl[ch])
150			continue;
151	✓✓	560820	for (i = 0; i < num_cpl_coefs; i++)
152		552192	cpl_coef[i] += ch_coef[i];
153			}
154
155			/* coefficients must be clipped in order to be encoded */
156		4314	clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs);
157			}
158
159			/* calculate energy in each band in coupling channel and each fbw channel */
160			/* TODO: possibly use SIMD to speed up energy calculation */
161		719	bnd = 0;
162		719	i = s->start_freq[CPL_CH];
163	✓✓	3595	while (i < s->cpl_end_freq) {
164		2876	int band_size = s->cpl_band_sizes[bnd];
165	✓✓	11504	for (ch = CPL_CH; ch <= s->fbw_channels; ch++) {
166	✓✓	60396	for (blk = 0; blk < s->num_blocks; blk++) {
167		51768	AC3Block *block = &s->blocks[blk];
168	✓✗✓✓ ✗✓	51768	if (!block->cpl_in_use \|\| (ch > CPL_CH && !block->channel_in_cpl[ch]))
169			continue;
170	✓✓	828288	for (j = 0; j < band_size; j++) {
171		776520	CoefType v = block->mdct_coef[ch][i+j];
172		776520	MAC_COEF(energy[blk][ch][bnd], v, v);
173			}
174			}
175			}
176		2876	i += band_size;
177		2876	bnd++;
178			}
179
180			/* calculate coupling coordinates for all blocks for all channels */
181	✓✓	5033	for (blk = 0; blk < s->num_blocks; blk++) {
182		4314	AC3Block *block = &s->blocks[blk];
183	✗✓	4314	if (!block->cpl_in_use)
184			continue;
185	✓✓	12942	for (ch = 1; ch <= s->fbw_channels; ch++) {
186	✗✓	8628	if (!block->channel_in_cpl[ch])
187			continue;
188	✓✓	43140	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
189		34512	cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd],
190			energy[blk][CPL_CH][bnd]);
191			}
192			}
193			}
194
195			/* determine which blocks to send new coupling coordinates for */
196	✓✓	5033	for (blk = 0; blk < s->num_blocks; blk++) {
197		4314	AC3Block *block = &s->blocks[blk];
198	✓✓	4314	AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL;
199
200		4314	memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords));
201
202	✓✗	4314	if (block->cpl_in_use) {
203			/* send new coordinates if this is the first block, if previous
204			* block did not use coupling but this block does, the channels
205			* using coupling has changed from the previous block, or the
206			* coordinate difference from the last block for any channel is
207			* greater than a threshold value. */
208	✓✓✗✓	4314	if (blk == 0 \|\| !block0->cpl_in_use) {
209	✓✓	2157	for (ch = 1; ch <= s->fbw_channels; ch++)
210		1438	block->new_cpl_coords[ch] = 1;
211			} else {
212	✓✓	10785	for (ch = 1; ch <= s->fbw_channels; ch++) {
213	✗✓	7190	if (!block->channel_in_cpl[ch])
214			continue;
215	✗✓	7190	if (!block0->channel_in_cpl[ch]) {
216			block->new_cpl_coords[ch] = 1;
217			} else {
218		7190	CoefSumType coord_diff = 0;
219	✓✓	35950	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
220	✓✓	28760	coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] -
221			cpl_coords[blk ][ch][bnd]);
222			}
223		7190	coord_diff /= s->num_cpl_bands;
224	✓✓	7190	if (coord_diff > NEW_CPL_COORD_THRESHOLD)
225		32	block->new_cpl_coords[ch] = 1;
226			}
227			}
228			}
229			}
230			}
231
232			/* calculate final coupling coordinates, taking into account reusing of
233			coordinates in successive blocks */
234	✓✓	3595	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
235		2876	blk = 0;
236	✓✓	5840	while (blk < s->num_blocks) {
237		2964	int av_uninit(blk1);
238		2964	AC3Block *block = &s->blocks[blk];
239
240	✗✓	2964	if (!block->cpl_in_use) {
241			blk++;
242			continue;
243			}
244
245	✓✓	8892	for (ch = 1; ch <= s->fbw_channels; ch++) {
246			CoefSumType energy_ch, energy_cpl;
247	✗✓	5928	if (!block->channel_in_cpl[ch])
248			continue;
249		5928	energy_cpl = energy[blk][CPL_CH][bnd];
250		5928	energy_ch = energy[blk][ch][bnd];
251		5928	blk1 = blk+1;
252	✓✓✓✓	34696	while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) {
253	✓✗	28768	if (s->blocks[blk1].cpl_in_use) {
254		28768	energy_cpl += energy[blk1][CPL_CH][bnd];
255		28768	energy_ch += energy[blk1][ch][bnd];
256			}
257		28768	blk1++;
258			}
259		5928	cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl);
260			}
261		2964	blk = blk1;
262			}
263			}
264
265			/* calculate exponents/mantissas for coupling coordinates */
266	✓✓	5033	for (blk = 0; blk < s->num_blocks; blk++) {
267		4314	AC3Block *block = &s->blocks[blk];
268	✗✓	4314	if (!block->cpl_in_use)
269			continue;
270
271			#if CONFIG_AC3ENC_FLOAT
272		3276	s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
273		3276	cpl_coords[blk][1],
274		3276	s->fbw_channels * 16);
275			#endif
276		4314	s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
277		4314	fixed_cpl_coords[blk][1],
278		4314	s->fbw_channels * 16);
279
280	✓✓	12942	for (ch = 1; ch <= s->fbw_channels; ch++) {
281			int bnd, min_exp, max_exp, master_exp;
282
283	✓✓	8628	if (!block->new_cpl_coords[ch])
284		7158	continue;
285
286			/* determine master exponent */
287		1470	min_exp = max_exp = block->cpl_coord_exp[ch][0];
288	✓✓	5880	for (bnd = 1; bnd < s->num_cpl_bands; bnd++) {
289		4410	int exp = block->cpl_coord_exp[ch][bnd];
290		4410	min_exp = FFMIN(exp, min_exp);
291		4410	max_exp = FFMAX(exp, max_exp);
292			}
293		1470	master_exp = ((max_exp - 15) + 2) / 3;
294		1470	master_exp = FFMAX(master_exp, 0);
295	✗✓	1470	while (min_exp < master_exp * 3)
296			master_exp--;
297	✓✓	7350	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
298		5880	block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] -
299		5880	master_exp * 3, 0, 15);
300			}
301		1470	block->cpl_master_exp[ch] = master_exp;
302
303			/* quantize mantissas */
304	✓✓	7350	for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
305		5880	int cpl_exp = block->cpl_coord_exp[ch][bnd];
306		5880	int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24;
307	✗✓	5880	if (cpl_exp == 15)
308			cpl_mant >>= 1;
309			else
310		5880	cpl_mant -= 16;
311
312		5880	block->cpl_coord_mant[ch][bnd] = cpl_mant;
313			}
314			}
315			}
316
317	✓✓	719	if (CONFIG_EAC3_ENCODER && s->eac3)
318		273	ff_eac3_set_cpl_states(s);
319		719	}
320
321
322			/*
323			* Determine rematrixing flags for each block and band.
324			*/
325		1097	static void compute_rematrixing_strategy(AC3EncodeContext *s)
326			{
327			int nb_coefs;
328			int blk, bnd;
329		1097	AC3Block block, block0 = NULL;
330
331	✓✓	1097	if (s->channel_mode != AC3_CHMODE_STEREO)
332		378	return;
333
334	✓✓	5033	for (blk = 0; blk < s->num_blocks; blk++) {
335		4314	block = &s->blocks[blk];
336		4314	block->new_rematrixing_strategy = !blk;
337
338		4314	block->num_rematrixing_bands = 4;
339	✓✗	4314	if (block->cpl_in_use) {
340		4314	block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61);
341		4314	block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37);
342	✓✓✗✓	4314	if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands)
343			block->new_rematrixing_strategy = 1;
344			}
345		4314	nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
346
347	✗✓	4314	if (!s->rematrixing_enabled) {
348			block0 = block;
349			continue;
350			}
351
352	✓✓	21570	for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
353			/* calculate sum of squared coeffs for one band in one block */
354		17256	int start = ff_ac3_rematrix_band_tab[bnd];
355		17256	int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
356			CoefSumType sum[4];
357		17256	sum_square_butterfly(s, sum, block->mdct_coef[1] + start,
358		17256	block->mdct_coef[2] + start, end - start);
359
360			/* compare sums to determine if rematrixing will be used for this band */
361	✓✓✓✓ ✓✓	17256	if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
362		9589	block->rematrixing_flags[bnd] = 1;
363			else
364		7667	block->rematrixing_flags[bnd] = 0;
365
366			/* determine if new rematrixing flags will be sent */
367	✓✓	17256	if (blk &&
368	✓✓	14380	block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
369		1932	block->new_rematrixing_strategy = 1;
370			}
371			}
372		4314	block0 = block;
373			}
374			}
375
376
377		1097	int AC3_NAME(encode_frame)(AVCodecContext avctx, AVPacket avpkt,
378			const AVFrame frame, int got_packet_ptr)
379			{
380		1097	AC3EncodeContext *s = avctx->priv_data;
381			int ret;
382
383	✗✓	1097	if (s->options.allow_per_frame_metadata) {
384			ret = ff_ac3_validate_metadata(s);
385			if (ret)
386			return ret;
387			}
388
389	✗✓✗✗	1097	if (s->bit_alloc.sr_code == 1 \|\| s->eac3)
390		1097	ff_ac3_adjust_frame_size(s);
391
392		1097	copy_input_samples(s, (SampleType **)frame->extended_data);
393
394		1097	apply_mdct(s);
395
396	✓✓	1097	if (s->fixed_point)
397		551	scale_coefficients(s);
398
399		1097	clip_coefficients(&s->adsp, s->blocks[0].mdct_coef[1],
400		1097	AC3_MAX_COEFS * s->num_blocks * s->channels);
401
402		1097	s->cpl_on = s->cpl_enabled;
403		1097	ff_ac3_compute_coupling_strategy(s);
404
405	✓✓	1097	if (s->cpl_on)
406		719	apply_channel_coupling(s);
407
408		1097	compute_rematrixing_strategy(s);
409
410	✓✓	1097	if (!s->fixed_point)
411		546	scale_coefficients(s);
412
413		1097	ff_ac3_apply_rematrixing(s);
414
415		1097	ff_ac3_process_exponents(s);
416
417		1097	ret = ff_ac3_compute_bit_allocation(s);
418	✗✓	1097	if (ret) {
419			av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
420			return ret;
421			}
422
423		1097	ff_ac3_group_exponents(s);
424
425		1097	ff_ac3_quantize_mantissas(s);
426
427	✗✓	1097	if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size, 0)) < 0)
428			return ret;
429		1097	ff_ac3_output_frame(s, avpkt->data);
430
431	✓✗	1097	if (frame->pts != AV_NOPTS_VALUE)
432		1097	avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
433
434		1097	*got_packet_ptr = 1;
435		1097	return 0;
436			}