[deb_ffmpeg.git] / ffmpeg / libavcodec / eac3enc.c

/*
 * 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,
    .channel_layouts = ff_ac3_channel_layouts,
    .defaults        = ac3_defaults,
};
Commit	Line	Data
2ba45a60 DM	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	av_cold void ff_eac3_exponent_init(void)
	53	{
	54	int i;
	55
	56	memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
	57	for (i = 0; i < 32; i++) {
	58	eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
	59	[ff_eac3_frm_expstr[i][1]]
	60	[ff_eac3_frm_expstr[i][2]]
	61	[ff_eac3_frm_expstr[i][3]]
	62	[ff_eac3_frm_expstr[i][4]]
	63	[ff_eac3_frm_expstr[i][5]] = i;
	64	}
65	}
66
67
68	void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
69	{
70	int ch;
71
72	if (s->num_blocks < 6) {
73	s->use_frame_exp_strategy = 0;
74	return;
75	}
76
77	s->use_frame_exp_strategy = 1;
78	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
79	int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
80	[s->exp_strategy[ch][1]]
81	[s->exp_strategy[ch][2]]
82	[s->exp_strategy[ch][3]]
83	[s->exp_strategy[ch][4]]
84	[s->exp_strategy[ch][5]];
85	if (expstr < 0) {
86	s->use_frame_exp_strategy = 0;
87	break;
88	}
89	s->frame_exp_strategy[ch] = expstr;
90	}
91	}
92
93
94
95	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	for (ch = 1; ch <= s->fbw_channels; ch++)
102	first_cpl_coords[ch] = 1;
103	for (blk = 0; blk < s->num_blocks; blk++) {
104	AC3Block *block = &s->blocks[blk];
105	for (ch = 1; ch <= s->fbw_channels; ch++) {
106	if (block->channel_in_cpl[ch]) {
107	if (first_cpl_coords[ch]) {
108	block->new_cpl_coords[ch] = 2;
109	first_cpl_coords[ch] = 0;
110	}
111	} else {
112	first_cpl_coords[ch] = 1;
113	}
114	}
115	}
116
117	/* set first cpl leak */
118	for (blk = 0; blk < s->num_blocks; blk++) {
119	AC3Block *block = &s->blocks[blk];
120	if (block->cpl_in_use) {
121	block->new_cpl_leak = 2;
122	break;
123	}
124	}
125	}
126
127
128	void ff_eac3_output_frame_header(AC3EncodeContext *s)
129	{
130	int blk, ch;
131	AC3EncOptions *opt = &s->options;
132
133	put_bits(&s->pb, 16, 0x0b77); /* sync word */
134
135	/* BSI header */
136	put_bits(&s->pb, 2, 0); /* stream type = independent */
137	put_bits(&s->pb, 3, 0); /* substream id = 0 */
138	put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */
139	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	put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
144	put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */
145	}
146	put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */
147	put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */
148	put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
149	put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */
150	put_bits(&s->pb, 1, 0); /* no compression gain */
151	/* mixing metadata*/
152	put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
153	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	put_bits(&s->pb, 1, opt->eac3_info_metadata);
175	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	if (s->num_blocks != 6)
194	put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
195	put_bits(&s->pb, 1, 0); /* no additional bit stream info */
196
197	/* frame header */
198	if (s->num_blocks == 6) {
199	put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
200	put_bits(&s->pb, 1, 0); /* aht enabled = no */
201	}
202	put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */
203	put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */
204	put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */
205	put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */
206	put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */
207	put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */
208	put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */
209	put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */
210	put_bits(&s->pb, 1, 0); /* spx enabled = no */
211	/* coupling strategy use flags */
212	if (s->channel_mode > AC3_CHMODE_MONO) {
213	put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
214	for (blk = 1; blk < s->num_blocks; blk++) {
215	AC3Block *block = &s->blocks[blk];
216	put_bits(&s->pb, 1, block->new_cpl_strategy);
217	if (block->new_cpl_strategy)
218	put_bits(&s->pb, 1, block->cpl_in_use);
219	}
220	}
221	/* exponent strategy */
222	if (s->use_frame_exp_strategy) {
223	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
224	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	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	if (s->num_blocks != 6) {
236	put_bits(&s->pb, 1, 0);
237	} else {
238	for (ch = 1; ch <= s->fbw_channels; ch++) {
239	if (s->use_frame_exp_strategy)
240	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	put_bits(&s->pb, 6, s->coarse_snr_offset);
247	put_bits(&s->pb, 4, s->fine_snr_offset[1]);
248	/* block start info */
249	if (s->num_blocks > 1)
250	put_bits(&s->pb, 1, 0);
251	}
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	.channel_layouts = ff_ac3_channel_layouts,
267	.defaults = ac3_defaults,
268	};