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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * E-AC-3 encoder |
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| 3 | * Copyright (c) 2011 Justin Ruggles |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * E-AC-3 encoder |
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| 25 | */ |
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| 26 | |||
| 27 | #define CONFIG_AC3ENC_FLOAT 1 |
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| 28 | |||
| 29 | #include "libavutil/attributes.h" |
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| 30 | #include "ac3enc.h" |
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| 31 | #include "eac3enc.h" |
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| 32 | #include "eac3_data.h" |
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| 33 | |||
| 34 | |||
| 35 | #define AC3ENC_TYPE AC3ENC_TYPE_EAC3 |
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| 36 | #include "ac3enc_opts_template.c" |
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| 37 | |||
| 38 | static const AVClass eac3enc_class = { |
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| 39 | .class_name = "E-AC-3 Encoder", |
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| 40 | .item_name = av_default_item_name, |
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| 41 | .option = ac3_options, |
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| 42 | .version = LIBAVUTIL_VERSION_INT, |
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| 43 | }; |
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| 44 | |||
| 45 | /** |
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| 46 | * LUT for finding a matching frame exponent strategy index from a set of |
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| 47 | * exponent strategies for a single channel across all 6 blocks. |
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| 48 | */ |
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| 49 | static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4]; |
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| 50 | |||
| 51 | |||
| 52 | av_cold void ff_eac3_exponent_init(void) |
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| 53 | { |
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| 54 | int i; |
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| 55 | |||
| 56 | memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab)); |
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| 57 | for (i = 0; i < 32; i++) { |
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| 58 | eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1] |
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| 59 | [ff_eac3_frm_expstr[i][1]] |
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| 60 | [ff_eac3_frm_expstr[i][2]] |
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| 61 | [ff_eac3_frm_expstr[i][3]] |
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| 62 | [ff_eac3_frm_expstr[i][4]] |
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| 63 | [ff_eac3_frm_expstr[i][5]] = i; |
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| 64 | } |
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| 65 | } |
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| 66 | |||
| 67 | |||
| 68 | void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s) |
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| 69 | { |
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| 70 | int ch; |
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| 71 | |||
| 72 | if (s->num_blocks < 6) { |
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| 73 | s->use_frame_exp_strategy = 0; |
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| 74 | return; |
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| 75 | } |
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| 76 | |||
| 77 | s->use_frame_exp_strategy = 1; |
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| 78 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { |
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| 79 | int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1] |
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| 80 | [s->exp_strategy[ch][1]] |
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| 81 | [s->exp_strategy[ch][2]] |
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| 82 | [s->exp_strategy[ch][3]] |
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| 83 | [s->exp_strategy[ch][4]] |
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| 84 | [s->exp_strategy[ch][5]]; |
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| 85 | if (expstr < 0) { |
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| 86 | s->use_frame_exp_strategy = 0; |
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| 87 | break; |
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| 88 | } |
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| 89 | s->frame_exp_strategy[ch] = expstr; |
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| 90 | } |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | |||
| 95 | void ff_eac3_set_cpl_states(AC3EncodeContext *s) |
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| 96 | { |
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| 97 | int ch, blk; |
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| 98 | int first_cpl_coords[AC3_MAX_CHANNELS]; |
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| 99 | |||
| 100 | /* set first cpl coords */ |
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| 101 | for (ch = 1; ch <= s->fbw_channels; ch++) |
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| 102 | first_cpl_coords[ch] = 1; |
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| 103 | for (blk = 0; blk < s->num_blocks; blk++) { |
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| 104 | AC3Block *block = &s->blocks[blk]; |
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| 105 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
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| 106 | if (block->channel_in_cpl[ch]) { |
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| 107 | if (first_cpl_coords[ch]) { |
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| 108 | block->new_cpl_coords[ch] = 2; |
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| 109 | first_cpl_coords[ch] = 0; |
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| 110 | } |
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| 111 | } else { |
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| 112 | first_cpl_coords[ch] = 1; |
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| 113 | } |
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| 114 | } |
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| 115 | } |
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| 116 | |||
| 117 | /* set first cpl leak */ |
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| 118 | for (blk = 0; blk < s->num_blocks; blk++) { |
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| 119 | AC3Block *block = &s->blocks[blk]; |
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| 120 | if (block->cpl_in_use) { |
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| 121 | block->new_cpl_leak = 2; |
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| 122 | break; |
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| 123 | } |
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| 124 | } |
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| 125 | } |
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| 126 | |||
| 127 | |||
| 128 | void ff_eac3_output_frame_header(AC3EncodeContext *s) |
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| 129 | { |
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| 130 | int blk, ch; |
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| 131 | AC3EncOptions *opt = &s->options; |
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| 132 | |||
| 133 | put_bits(&s->pb, 16, 0x0b77); /* sync word */ |
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| 134 | |||
| 135 | /* BSI header */ |
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| 136 | put_bits(&s->pb, 2, 0); /* stream type = independent */ |
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| 137 | put_bits(&s->pb, 3, 0); /* substream id = 0 */ |
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| 138 | put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ |
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| 139 | if (s->bit_alloc.sr_shift) { |
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| 140 | put_bits(&s->pb, 2, 0x3); /* fscod2 */ |
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| 141 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
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| 142 | } else { |
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| 143 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
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| 144 | put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */ |
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| 145 | } |
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| 146 | put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ |
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| 147 | put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ |
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| 148 | put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ |
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| 149 | put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ |
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| 150 | put_bits(&s->pb, 1, 0); /* no compression gain */ |
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| 151 | /* mixing metadata*/ |
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| 152 | put_bits(&s->pb, 1, opt->eac3_mixing_metadata); |
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| 153 | if (opt->eac3_mixing_metadata) { |
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| 154 | if (s->channel_mode > AC3_CHMODE_STEREO) |
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| 155 | put_bits(&s->pb, 2, opt->preferred_stereo_downmix); |
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| 156 | if (s->has_center) { |
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| 157 | put_bits(&s->pb, 3, s->ltrt_center_mix_level); |
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| 158 | put_bits(&s->pb, 3, s->loro_center_mix_level); |
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| 159 | } |
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| 160 | if (s->has_surround) { |
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| 161 | put_bits(&s->pb, 3, s->ltrt_surround_mix_level); |
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| 162 | put_bits(&s->pb, 3, s->loro_surround_mix_level); |
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| 163 | } |
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| 164 | if (s->lfe_on) |
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| 165 | put_bits(&s->pb, 1, 0); |
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| 166 | put_bits(&s->pb, 1, 0); /* no program scale */ |
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| 167 | put_bits(&s->pb, 1, 0); /* no ext program scale */ |
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| 168 | put_bits(&s->pb, 2, 0); /* no mixing parameters */ |
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| 169 | if (s->channel_mode < AC3_CHMODE_STEREO) |
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| 170 | put_bits(&s->pb, 1, 0); /* no pan info */ |
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| 171 | put_bits(&s->pb, 1, 0); /* no frame mix config info */ |
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| 172 | } |
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| 173 | /* info metadata*/ |
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| 174 | put_bits(&s->pb, 1, opt->eac3_info_metadata); |
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| 175 | if (opt->eac3_info_metadata) { |
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| 176 | put_bits(&s->pb, 3, s->bitstream_mode); |
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| 177 | put_bits(&s->pb, 1, opt->copyright); |
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| 178 | put_bits(&s->pb, 1, opt->original); |
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| 179 | if (s->channel_mode == AC3_CHMODE_STEREO) { |
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| 180 | put_bits(&s->pb, 2, opt->dolby_surround_mode); |
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| 181 | put_bits(&s->pb, 2, opt->dolby_headphone_mode); |
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| 182 | } |
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| 183 | if (s->channel_mode >= AC3_CHMODE_2F2R) |
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| 184 | put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); |
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| 185 | put_bits(&s->pb, 1, opt->audio_production_info); |
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| 186 | if (opt->audio_production_info) { |
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| 187 | put_bits(&s->pb, 5, opt->mixing_level - 80); |
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| 188 | put_bits(&s->pb, 2, opt->room_type); |
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| 189 | put_bits(&s->pb, 1, opt->ad_converter_type); |
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| 190 | } |
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| 191 | put_bits(&s->pb, 1, 0); |
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| 192 | } |
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| 193 | if (s->num_blocks != 6) |
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| 194 | put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */ |
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| 195 | put_bits(&s->pb, 1, 0); /* no additional bit stream info */ |
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| 196 | |||
| 197 | /* frame header */ |
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| 198 | if (s->num_blocks == 6) { |
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| 199 | put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */ |
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| 200 | put_bits(&s->pb, 1, 0); /* aht enabled = no */ |
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| 201 | } |
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| 202 | put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ |
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| 203 | put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ |
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| 204 | put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ |
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| 205 | put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ |
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| 206 | put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ |
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| 207 | put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ |
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| 208 | put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ |
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| 209 | put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ |
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| 210 | put_bits(&s->pb, 1, 0); /* spx enabled = no */ |
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| 211 | /* coupling strategy use flags */ |
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| 212 | if (s->channel_mode > AC3_CHMODE_MONO) { |
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| 213 | put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); |
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| 214 | for (blk = 1; blk < s->num_blocks; blk++) { |
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| 215 | AC3Block *block = &s->blocks[blk]; |
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| 216 | put_bits(&s->pb, 1, block->new_cpl_strategy); |
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| 217 | if (block->new_cpl_strategy) |
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| 218 | put_bits(&s->pb, 1, block->cpl_in_use); |
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| 219 | } |
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| 220 | } |
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| 221 | /* exponent strategy */ |
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| 222 | if (s->use_frame_exp_strategy) { |
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| 223 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) |
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| 224 | put_bits(&s->pb, 5, s->frame_exp_strategy[ch]); |
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| 225 | } else { |
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| 226 | for (blk = 0; blk < s->num_blocks; blk++) |
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| 227 | for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) |
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| 228 | put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); |
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| 229 | } |
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| 230 | if (s->lfe_on) { |
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| 231 | for (blk = 0; blk < s->num_blocks; blk++) |
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| 232 | put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); |
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| 233 | } |
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| 234 | /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */ |
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| 235 | if (s->num_blocks != 6) { |
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| 236 | put_bits(&s->pb, 1, 0); |
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| 237 | } else { |
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| 238 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
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| 239 | if (s->use_frame_exp_strategy) |
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| 240 | put_bits(&s->pb, 5, s->frame_exp_strategy[ch]); |
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| 241 | else |
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| 242 | put_bits(&s->pb, 5, 0); |
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| 243 | } |
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| 244 | } |
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| 245 | /* snr offsets */ |
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| 246 | put_bits(&s->pb, 6, s->coarse_snr_offset); |
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| 247 | put_bits(&s->pb, 4, s->fine_snr_offset[1]); |
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| 248 | /* block start info */ |
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| 249 | if (s->num_blocks > 1) |
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| 250 | put_bits(&s->pb, 1, 0); |
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| 251 | } |
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| 252 | |||
| 253 | |||
| 254 | #if CONFIG_EAC3_ENCODER |
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| 255 | AVCodec ff_eac3_encoder = { |
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| 256 | .name = "eac3", |
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| 257 | .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"), |
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| 258 | .type = AVMEDIA_TYPE_AUDIO, |
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| 259 | .id = AV_CODEC_ID_EAC3, |
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| 260 | .priv_data_size = sizeof(AC3EncodeContext), |
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| 261 | .init = ff_ac3_encode_init, |
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| 262 | .encode2 = ff_ac3_float_encode_frame, |
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| 263 | .close = ff_ac3_encode_close, |
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| 264 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, |
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| 265 | AV_SAMPLE_FMT_NONE }, |
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| 266 | .priv_class = &eac3enc_class, |
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| 267 | .channel_layouts = ff_ac3_channel_layouts, |
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| 268 | .defaults = ac3_defaults, |
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| 269 | }; |
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| 270 | #endif |