| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2007 Ian Caulfield | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include <stdint.h> | ||
| 22 | |||
| 23 | #include "libavutil/channel_layout.h" | ||
| 24 | #include "get_bits.h" | ||
| 25 | #include "mlp_parse.h" | ||
| 26 | #include "mlp.h" | ||
| 27 | |||
| 28 | static const uint8_t mlp_quants[16] = { | ||
| 29 | 16, 20, 24, 0, 0, 0, 0, 0, | ||
| 30 | 0, 0, 0, 0, 0, 0, 0, 0, | ||
| 31 | }; | ||
| 32 | |||
| 33 | static const uint8_t mlp_channels[32] = { | ||
| 34 | 1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4, | ||
| 35 | 5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | ||
| 36 | }; | ||
| 37 | |||
| 38 | static const uint64_t mlp_layout[32] = { | ||
| 39 | AV_CH_LAYOUT_MONO, | ||
| 40 | AV_CH_LAYOUT_STEREO, | ||
| 41 | AV_CH_LAYOUT_2_1, | ||
| 42 | AV_CH_LAYOUT_QUAD, | ||
| 43 | AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, | ||
| 44 | AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, | ||
| 45 | AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, | ||
| 46 | AV_CH_LAYOUT_SURROUND, | ||
| 47 | AV_CH_LAYOUT_4POINT0, | ||
| 48 | AV_CH_LAYOUT_5POINT0_BACK, | ||
| 49 | AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, | ||
| 50 | AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, | ||
| 51 | AV_CH_LAYOUT_5POINT1_BACK, | ||
| 52 | AV_CH_LAYOUT_4POINT0, | ||
| 53 | AV_CH_LAYOUT_5POINT0_BACK, | ||
| 54 | AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, | ||
| 55 | AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, | ||
| 56 | AV_CH_LAYOUT_5POINT1_BACK, | ||
| 57 | AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, | ||
| 58 | AV_CH_LAYOUT_5POINT0_BACK, | ||
| 59 | AV_CH_LAYOUT_5POINT1_BACK, | ||
| 60 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | ||
| 61 | }; | ||
| 62 | |||
| 63 | 4657 | static int mlp_get_major_sync_size(const uint8_t * buf, int bufsize) | |
| 64 | { | ||
| 65 | 4657 | int has_extension, extensions = 0; | |
| 66 | 4657 | int size = 28; | |
| 67 |
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4657 | if (bufsize < 28) |
| 68 | ✗ | return -1; | |
| 69 | |||
| 70 |
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4657 | if (AV_RB32(buf) == 0xf8726fba) { |
| 71 | 1310 | has_extension = buf[25] & 1; | |
| 72 |
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1310 | if (has_extension) { |
| 73 | 8 | extensions = buf[26] >> 4; | |
| 74 | 8 | size += 2 + extensions * 2; | |
| 75 | } | ||
| 76 | } | ||
| 77 | 4657 | return size; | |
| 78 | } | ||
| 79 | |||
| 80 | /** Read a major sync info header - contains high level information about | ||
| 81 | * the stream - sample rate, channel arrangement etc. Most of this | ||
| 82 | * information is not actually necessary for decoding, only for playback. | ||
| 83 | * gb must be a freshly initialized GetBitContext with no bits read. | ||
| 84 | */ | ||
| 85 | |||
| 86 | 4657 | int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) | |
| 87 | { | ||
| 88 | int ratebits, channel_arrangement, header_size; | ||
| 89 | uint16_t checksum; | ||
| 90 | |||
| 91 | av_assert1(get_bits_count(gb) == 0); | ||
| 92 | |||
| 93 | 4657 | header_size = mlp_get_major_sync_size(gb->buffer, gb->size_in_bits >> 3); | |
| 94 |
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4657 | if (header_size < 0 || gb->size_in_bits < header_size << 3) { |
| 95 | ✗ | av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n"); | |
| 96 | ✗ | return -1; | |
| 97 | } | ||
| 98 | |||
| 99 | 4657 | checksum = ff_mlp_checksum16(gb->buffer, header_size - 2); | |
| 100 |
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4657 | if (checksum != AV_RL16(gb->buffer+header_size-2)) { |
| 101 | ✗ | av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n"); | |
| 102 | ✗ | return AVERROR_INVALIDDATA; | |
| 103 | } | ||
| 104 | |||
| 105 |
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4657 | if (get_bits(gb, 24) != 0xf8726f) /* Sync words */ |
| 106 | ✗ | return AVERROR_INVALIDDATA; | |
| 107 | |||
| 108 | 4657 | mh->stream_type = get_bits(gb, 8); | |
| 109 | 4657 | mh->header_size = header_size; | |
| 110 | |||
| 111 |
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4657 | if (mh->stream_type == 0xbb) { |
| 112 | 3347 | mh->group1_bits = mlp_quants[get_bits(gb, 4)]; | |
| 113 | 3347 | mh->group2_bits = mlp_quants[get_bits(gb, 4)]; | |
| 114 | |||
| 115 | 3347 | ratebits = get_bits(gb, 4); | |
| 116 | 3347 | mh->group1_samplerate = mlp_samplerate(ratebits); | |
| 117 | 3347 | mh->group2_samplerate = mlp_samplerate(get_bits(gb, 4)); | |
| 118 | |||
| 119 | 3347 | skip_bits(gb, 11); | |
| 120 | |||
| 121 | 3347 | mh->channel_arrangement= | |
| 122 | 3347 | channel_arrangement = get_bits(gb, 5); | |
| 123 | 3347 | mh->channels_mlp = mlp_channels[channel_arrangement]; | |
| 124 | 3347 | mh->channel_layout_mlp = mlp_layout[channel_arrangement]; | |
| 125 |
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1310 | } else if (mh->stream_type == 0xba) { |
| 126 | 1310 | mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere? | |
| 127 | 1310 | mh->group2_bits = 0; | |
| 128 | |||
| 129 | 1310 | ratebits = get_bits(gb, 4); | |
| 130 | 1310 | mh->group1_samplerate = mlp_samplerate(ratebits); | |
| 131 | 1310 | mh->group2_samplerate = 0; | |
| 132 | |||
| 133 | 1310 | skip_bits(gb, 4); | |
| 134 | |||
| 135 | 1310 | mh->channel_modifier_thd_stream0 = get_bits(gb, 2); | |
| 136 | 1310 | mh->channel_modifier_thd_stream1 = get_bits(gb, 2); | |
| 137 | |||
| 138 | 1310 | mh->channel_arrangement= | |
| 139 | 1310 | channel_arrangement = get_bits(gb, 5); | |
| 140 | 1310 | mh->channels_thd_stream1 = truehd_channels(channel_arrangement); | |
| 141 | 1310 | mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement); | |
| 142 | |||
| 143 | 1310 | mh->channel_modifier_thd_stream2 = get_bits(gb, 2); | |
| 144 | |||
| 145 | 1310 | channel_arrangement = get_bits(gb, 13); | |
| 146 | 1310 | mh->channels_thd_stream2 = truehd_channels(channel_arrangement); | |
| 147 | 1310 | mh->channel_layout_thd_stream2 = truehd_layout(channel_arrangement); | |
| 148 | } else | ||
| 149 | ✗ | return AVERROR_INVALIDDATA; | |
| 150 | |||
| 151 | 4657 | mh->access_unit_size = 40 << (ratebits & 7); | |
| 152 | 4657 | mh->access_unit_size_pow2 = 64 << (ratebits & 7); | |
| 153 | |||
| 154 | 4657 | skip_bits_long(gb, 48); | |
| 155 | |||
| 156 | 4657 | mh->is_vbr = get_bits1(gb); | |
| 157 | |||
| 158 | 4657 | mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4; | |
| 159 | |||
| 160 | 4657 | mh->num_substreams = get_bits(gb, 4); | |
| 161 | |||
| 162 | 4657 | skip_bits(gb, 2); | |
| 163 | 4657 | mh->extended_substream_info = get_bits(gb, 2); | |
| 164 | 4657 | mh->substream_info = get_bits(gb, 8); | |
| 165 | |||
| 166 | 4657 | skip_bits_long(gb, (header_size - 18) * 8); | |
| 167 | |||
| 168 | 4657 | return 0; | |
| 169 | } | ||
| 170 |