FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/eac3enc.c	Lines:	89	135	65.9 %
Date:	2020-07-13 04:22:34	Branches:	35	74	47.3 %


/*
 * E-AC-3 encoder
 * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
 *
 * 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
 * E-AC-3 encoder
 */

#define CONFIG_AC3ENC_FLOAT 1

#include "libavutil/attributes.h"
#include "ac3enc.h"
#include "eac3enc.h"
#include "eac3_data.h"


#define AC3ENC_TYPE AC3ENC_TYPE_EAC3
#include "ac3enc_opts_template.c"

static const AVClass eac3enc_class = {
    .class_name = "E-AC-3 Encoder",
    .item_name  = av_default_item_name,
    .option     = ac3_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

/**
 * LUT for finding a matching frame exponent strategy index from a set of
 * exponent strategies for a single channel across all 6 blocks.
 */
static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];


av_cold void ff_eac3_exponent_init(void)
{
    int i;

    memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
    for (i = 0; i < 32; i++) {
        eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
                                   [ff_eac3_frm_expstr[i][1]]
                                   [ff_eac3_frm_expstr[i][2]]
                                   [ff_eac3_frm_expstr[i][3]]
                                   [ff_eac3_frm_expstr[i][4]]
                                   [ff_eac3_frm_expstr[i][5]] = i;
    }
}


void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
{
    int ch;

    if (s->num_blocks < 6) {
        s->use_frame_exp_strategy = 0;
        return;
    }

    s->use_frame_exp_strategy = 1;
    for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
        int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
                                                [s->exp_strategy[ch][1]]
                                                [s->exp_strategy[ch][2]]
                                                [s->exp_strategy[ch][3]]
                                                [s->exp_strategy[ch][4]]
                                                [s->exp_strategy[ch][5]];
        if (expstr < 0) {
            s->use_frame_exp_strategy = 0;
            break;
        }
        s->frame_exp_strategy[ch] = expstr;
    }
}



void ff_eac3_set_cpl_states(AC3EncodeContext *s)
{
    int ch, blk;
    int first_cpl_coords[AC3_MAX_CHANNELS];

    /* set first cpl coords */
    for (ch = 1; ch <= s->fbw_channels; ch++)
        first_cpl_coords[ch] = 1;
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block = &s->blocks[blk];
        for (ch = 1; ch <= s->fbw_channels; ch++) {
            if (block->channel_in_cpl[ch]) {
                if (first_cpl_coords[ch]) {
                    block->new_cpl_coords[ch] = 2;
                    first_cpl_coords[ch]  = 0;
                }
            } else {
                first_cpl_coords[ch] = 1;
            }
        }
    }

    /* set first cpl leak */
    for (blk = 0; blk < s->num_blocks; blk++) {
        AC3Block *block = &s->blocks[blk];
        if (block->cpl_in_use) {
            block->new_cpl_leak = 2;
            break;
        }
    }
}


void ff_eac3_output_frame_header(AC3EncodeContext *s)
{
    int blk, ch;
    AC3EncOptions *opt = &s->options;

    put_bits(&s->pb, 16, 0x0b77);                   /* sync word */

    /* BSI header */
    put_bits(&s->pb,  2, 0);                        /* stream type = independent */
    put_bits(&s->pb,  3, 0);                        /* substream id = 0 */
    put_bits(&s->pb, 11, (s->frame_size / 2) - 1);  /* frame size */
    if (s->bit_alloc.sr_shift) {
        put_bits(&s->pb, 2, 0x3);                   /* fscod2 */
        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
    } else {
        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
        put_bits(&s->pb, 2, s->num_blks_code);      /* number of blocks */
    }
    put_bits(&s->pb, 3, s->channel_mode);           /* audio coding mode */
    put_bits(&s->pb, 1, s->lfe_on);                 /* LFE channel indicator */
    put_bits(&s->pb, 5, s->bitstream_id);           /* bitstream id (EAC3=16) */
    put_bits(&s->pb, 5, -opt->dialogue_level);      /* dialogue normalization level */
    put_bits(&s->pb, 1, 0);                         /* no compression gain */
    /* mixing metadata*/
    put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
    if (opt->eac3_mixing_metadata) {
        if (s->channel_mode > AC3_CHMODE_STEREO)
            put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
        if (s->has_center) {
            put_bits(&s->pb, 3, s->ltrt_center_mix_level);
            put_bits(&s->pb, 3, s->loro_center_mix_level);
        }
        if (s->has_surround) {
            put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
            put_bits(&s->pb, 3, s->loro_surround_mix_level);
        }
        if (s->lfe_on)
            put_bits(&s->pb, 1, 0);
        put_bits(&s->pb, 1, 0);                     /* no program scale */
        put_bits(&s->pb, 1, 0);                     /* no ext program scale */
        put_bits(&s->pb, 2, 0);                     /* no mixing parameters */
        if (s->channel_mode < AC3_CHMODE_STEREO)
            put_bits(&s->pb, 1, 0);                 /* no pan info */
        put_bits(&s->pb, 1, 0);                     /* no frame mix config info */
    }
    /* info metadata*/
    put_bits(&s->pb, 1, opt->eac3_info_metadata);
    if (opt->eac3_info_metadata) {
        put_bits(&s->pb, 3, s->bitstream_mode);
        put_bits(&s->pb, 1, opt->copyright);
        put_bits(&s->pb, 1, opt->original);
        if (s->channel_mode == AC3_CHMODE_STEREO) {
            put_bits(&s->pb, 2, opt->dolby_surround_mode);
            put_bits(&s->pb, 2, opt->dolby_headphone_mode);
        }
        if (s->channel_mode >= AC3_CHMODE_2F2R)
            put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
        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->ad_converter_type);
        }
        put_bits(&s->pb, 1, 0);
    }
    if (s->num_blocks != 6)
        put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
    put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */

    /* frame header */
    if (s->num_blocks == 6) {
    put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
    put_bits(&s->pb, 1, 0);                         /* aht enabled = no */
    }
    put_bits(&s->pb, 2, 0);                         /* snr offset strategy = 1 */
    put_bits(&s->pb, 1, 0);                         /* transient pre-noise processing enabled = no */
    put_bits(&s->pb, 1, 0);                         /* block switch syntax enabled = no */
    put_bits(&s->pb, 1, 0);                         /* dither flag syntax enabled = no */
    put_bits(&s->pb, 1, 0);                         /* bit allocation model syntax enabled = no */
    put_bits(&s->pb, 1, 0);                         /* fast gain codes enabled = no */
    put_bits(&s->pb, 1, 0);                         /* dba syntax enabled = no */
    put_bits(&s->pb, 1, 0);                         /* skip field syntax enabled = no */
    put_bits(&s->pb, 1, 0);                         /* spx enabled = no */
    /* coupling strategy use flags */
    if (s->channel_mode > AC3_CHMODE_MONO) {
        put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
        for (blk = 1; blk < s->num_blocks; blk++) {
            AC3Block *block = &s->blocks[blk];
            put_bits(&s->pb, 1, block->new_cpl_strategy);
            if (block->new_cpl_strategy)
                put_bits(&s->pb, 1, block->cpl_in_use);
        }
    }
    /* exponent strategy */
    if (s->use_frame_exp_strategy) {
        for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
            put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
    } else {
        for (blk = 0; blk < s->num_blocks; blk++)
            for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
                put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
    }
    if (s->lfe_on) {
        for (blk = 0; blk < s->num_blocks; blk++)
            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
    }
    /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
    if (s->num_blocks != 6) {
        put_bits(&s->pb, 1, 0);
    } else {
    for (ch = 1; ch <= s->fbw_channels; ch++) {
        if (s->use_frame_exp_strategy)
            put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
        else
            put_bits(&s->pb, 5, 0);
    }
    }
    /* snr offsets */
    put_bits(&s->pb, 6, s->coarse_snr_offset);
    put_bits(&s->pb, 4, s->fine_snr_offset[1]);
    /* block start info */
    if (s->num_blocks > 1)
        put_bits(&s->pb, 1, 0);
}


AVCodec ff_eac3_encoder = {
    .name            = "eac3",
    .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
    .type            = AVMEDIA_TYPE_AUDIO,
    .id              = AV_CODEC_ID_EAC3,
    .priv_data_size  = sizeof(AC3EncodeContext),
    .init            = ff_ac3_float_encode_init,
    .encode2         = ff_ac3_float_encode_frame,
    .close           = ff_ac3_encode_close,
    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                      AV_SAMPLE_FMT_NONE },
    .priv_class      = &eac3enc_class,
    .supported_samplerates = ff_ac3_sample_rate_tab,
    .channel_layouts = ff_ac3_channel_layouts,
    .defaults        = ac3_defaults,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* E-AC-3 encoder
3			* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* E-AC-3 encoder
25			*/
26
27			#define CONFIG_AC3ENC_FLOAT 1
28
29			#include "libavutil/attributes.h"
30			#include "ac3enc.h"
31			#include "eac3enc.h"
32			#include "eac3_data.h"
33
34
35			#define AC3ENC_TYPE AC3ENC_TYPE_EAC3
36			#include "ac3enc_opts_template.c"
37
38			static const AVClass eac3enc_class = {
39			.class_name = "E-AC-3 Encoder",
40			.item_name = av_default_item_name,
41			.option = ac3_options,
42			.version = LIBAVUTIL_VERSION_INT,
43			};
44
45			/**
46			* LUT for finding a matching frame exponent strategy index from a set of
47			* exponent strategies for a single channel across all 6 blocks.
48			*/
49			static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
50
51
52		1	av_cold void ff_eac3_exponent_init(void)
53			{
54			int i;
55
56		1	memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
57	✓✓	33	for (i = 0; i < 32; i++) {
58		32	eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
59		32	[ff_eac3_frm_expstr[i][1]]
60		32	[ff_eac3_frm_expstr[i][2]]
61		32	[ff_eac3_frm_expstr[i][3]]
62		32	[ff_eac3_frm_expstr[i][4]]
63		32	[ff_eac3_frm_expstr[i][5]] = i;
64			}
65		1	}
66
67
68		273	void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
69			{
70			int ch;
71
72	✗✓	273	if (s->num_blocks < 6) {
73			s->use_frame_exp_strategy = 0;
74			return;
75			}
76
77		273	s->use_frame_exp_strategy = 1;
78	✓✓	1092	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
79		819	int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
80		819	[s->exp_strategy[ch][1]]
81		819	[s->exp_strategy[ch][2]]
82		819	[s->exp_strategy[ch][3]]
83		819	[s->exp_strategy[ch][4]]
84		819	[s->exp_strategy[ch][5]];
85	✗✓	819	if (expstr < 0) {
86			s->use_frame_exp_strategy = 0;
87			break;
88			}
89		819	s->frame_exp_strategy[ch] = expstr;
90			}
91			}
92
93
94
95		273	void ff_eac3_set_cpl_states(AC3EncodeContext *s)
96			{
97			int ch, blk;
98			int first_cpl_coords[AC3_MAX_CHANNELS];
99
100			/* set first cpl coords */
101	✓✓	819	for (ch = 1; ch <= s->fbw_channels; ch++)
102		546	first_cpl_coords[ch] = 1;
103	✓✓	1911	for (blk = 0; blk < s->num_blocks; blk++) {
104		1638	AC3Block *block = &s->blocks[blk];
105	✓✓	4914	for (ch = 1; ch <= s->fbw_channels; ch++) {
106	✓✗	3276	if (block->channel_in_cpl[ch]) {
107	✓✓	3276	if (first_cpl_coords[ch]) {
108		546	block->new_cpl_coords[ch] = 2;
109		546	first_cpl_coords[ch] = 0;
110			}
111			} else {
112			first_cpl_coords[ch] = 1;
113			}
114			}
115			}
116
117			/* set first cpl leak */
118	✓✗	273	for (blk = 0; blk < s->num_blocks; blk++) {
119		273	AC3Block *block = &s->blocks[blk];
120	✓✗	273	if (block->cpl_in_use) {
121		273	block->new_cpl_leak = 2;
122		273	break;
123			}
124			}
125		273	}
126
127
128		273	void ff_eac3_output_frame_header(AC3EncodeContext *s)
129			{
130			int blk, ch;
131		273	AC3EncOptions *opt = &s->options;
132
133		273	put_bits(&s->pb, 16, 0x0b77); /* sync word */
134
135			/* BSI header */
136		273	put_bits(&s->pb, 2, 0); /* stream type = independent */
137		273	put_bits(&s->pb, 3, 0); /* substream id = 0 */
138		273	put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */
139	✗✓	273	if (s->bit_alloc.sr_shift) {
140			put_bits(&s->pb, 2, 0x3); /* fscod2 */
141			put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
142			} else {
143		273	put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
144		273	put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */
145			}
146		273	put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */
147		273	put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */
148		273	put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
149		273	put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */
150		273	put_bits(&s->pb, 1, 0); /* no compression gain */
151			/* mixing metadata*/
152		273	put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
153	✗✓	273	if (opt->eac3_mixing_metadata) {
154			if (s->channel_mode > AC3_CHMODE_STEREO)
155			put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
156			if (s->has_center) {
157			put_bits(&s->pb, 3, s->ltrt_center_mix_level);
158			put_bits(&s->pb, 3, s->loro_center_mix_level);
159			}
160			if (s->has_surround) {
161			put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
162			put_bits(&s->pb, 3, s->loro_surround_mix_level);
163			}
164			if (s->lfe_on)
165			put_bits(&s->pb, 1, 0);
166			put_bits(&s->pb, 1, 0); /* no program scale */
167			put_bits(&s->pb, 1, 0); /* no ext program scale */
168			put_bits(&s->pb, 2, 0); /* no mixing parameters */
169			if (s->channel_mode < AC3_CHMODE_STEREO)
170			put_bits(&s->pb, 1, 0); /* no pan info */
171			put_bits(&s->pb, 1, 0); /* no frame mix config info */
172			}
173			/* info metadata*/
174		273	put_bits(&s->pb, 1, opt->eac3_info_metadata);
175	✗✓	273	if (opt->eac3_info_metadata) {
176			put_bits(&s->pb, 3, s->bitstream_mode);
177			put_bits(&s->pb, 1, opt->copyright);
178			put_bits(&s->pb, 1, opt->original);
179			if (s->channel_mode == AC3_CHMODE_STEREO) {
180			put_bits(&s->pb, 2, opt->dolby_surround_mode);
181			put_bits(&s->pb, 2, opt->dolby_headphone_mode);
182			}
183			if (s->channel_mode >= AC3_CHMODE_2F2R)
184			put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
185			put_bits(&s->pb, 1, opt->audio_production_info);
186			if (opt->audio_production_info) {
187			put_bits(&s->pb, 5, opt->mixing_level - 80);
188			put_bits(&s->pb, 2, opt->room_type);
189			put_bits(&s->pb, 1, opt->ad_converter_type);
190			}
191			put_bits(&s->pb, 1, 0);
192			}
193	✗✓	273	if (s->num_blocks != 6)
194			put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
195		273	put_bits(&s->pb, 1, 0); /* no additional bit stream info */
196
197			/* frame header */
198	✓✗	273	if (s->num_blocks == 6) {
199		273	put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
200		273	put_bits(&s->pb, 1, 0); /* aht enabled = no */
201			}
202		273	put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */
203		273	put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */
204		273	put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */
205		273	put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */
206		273	put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */
207		273	put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */
208		273	put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */
209		273	put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */
210		273	put_bits(&s->pb, 1, 0); /* spx enabled = no */
211			/* coupling strategy use flags */
212	✓✗	273	if (s->channel_mode > AC3_CHMODE_MONO) {
213		273	put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
214	✓✓	1638	for (blk = 1; blk < s->num_blocks; blk++) {
215		1365	AC3Block *block = &s->blocks[blk];
216		1365	put_bits(&s->pb, 1, block->new_cpl_strategy);
217	✗✓	1365	if (block->new_cpl_strategy)
218			put_bits(&s->pb, 1, block->cpl_in_use);
219			}
220			}
221			/* exponent strategy */
222	✓✗	273	if (s->use_frame_exp_strategy) {
223	✓✓	1092	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
224		819	put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
225			} else {
226			for (blk = 0; blk < s->num_blocks; blk++)
227			for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
228			put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
229			}
230	✗✓	273	if (s->lfe_on) {
231			for (blk = 0; blk < s->num_blocks; blk++)
232			put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
233			}
234			/* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
235	✗✓	273	if (s->num_blocks != 6) {
236			put_bits(&s->pb, 1, 0);
237			} else {
238	✓✓	819	for (ch = 1; ch <= s->fbw_channels; ch++) {
239	✓✗	546	if (s->use_frame_exp_strategy)
240		546	put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
241			else
242			put_bits(&s->pb, 5, 0);
243			}
244			}
245			/* snr offsets */
246		273	put_bits(&s->pb, 6, s->coarse_snr_offset);
247		273	put_bits(&s->pb, 4, s->fine_snr_offset[1]);
248			/* block start info */
249	✓✗	273	if (s->num_blocks > 1)
250		273	put_bits(&s->pb, 1, 0);
251		273	}
252
253
254			AVCodec ff_eac3_encoder = {
255			.name = "eac3",
256			.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
257			.type = AVMEDIA_TYPE_AUDIO,
258			.id = AV_CODEC_ID_EAC3,
259			.priv_data_size = sizeof(AC3EncodeContext),
260			.init = ff_ac3_float_encode_init,
261			.encode2 = ff_ac3_float_encode_frame,
262			.close = ff_ac3_encode_close,
263			.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
264			AV_SAMPLE_FMT_NONE },
265			.priv_class = &eac3enc_class,
266			.supported_samplerates = ff_ac3_sample_rate_tab,
267			.channel_layouts = ff_ac3_channel_layouts,
268			.defaults = ac3_defaults,
269			};