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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * BRSTM demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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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 | #include "libavutil/intreadwrite.h" |
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| 23 | #include "libavcodec/bytestream.h" |
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| 24 | #include "avformat.h" |
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| 25 | #include "internal.h" |
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| 26 | |||
| 27 | typedef struct BRSTMDemuxContext { |
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| 28 | uint32_t block_size; |
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| 29 | uint32_t block_count; |
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| 30 | uint32_t current_block; |
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| 31 | uint32_t samples_per_block; |
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| 32 | uint32_t last_block_used_bytes; |
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| 33 | uint8_t *table; |
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| 34 | uint8_t *adpc; |
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| 35 | } BRSTMDemuxContext; |
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| 36 | |||
| 37 | static int probe(AVProbeData *p) |
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| 38 | { |
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| 39 | if (AV_RL32(p->buf) == MKTAG('R','S','T','M') && |
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| 40 | (AV_RL16(p->buf + 4) == 0xFFFE || |
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| 41 | AV_RL16(p->buf + 4) == 0xFEFF)) |
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| 42 | return AVPROBE_SCORE_MAX / 3 * 2; |
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| 43 | return 0; |
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| 44 | } |
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| 45 | |||
| 46 | static int read_close(AVFormatContext *s) |
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| 47 | { |
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| 48 | BRSTMDemuxContext *b = s->priv_data; |
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| 49 | |||
| 50 | av_freep(&b->table); |
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| 51 | av_freep(&b->adpc); |
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| 52 | |||
| 53 | return 0; |
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| 54 | } |
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| 55 | |||
| 56 | static int read_header(AVFormatContext *s) |
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| 57 | { |
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| 58 | BRSTMDemuxContext *b = s->priv_data; |
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| 59 | int bom, major, minor, codec, chunk; |
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| 60 | int64_t pos, h1offset, toffset; |
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| 61 | uint32_t size, start, asize; |
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| 62 | AVStream *st; |
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| 63 | int ret = AVERROR_EOF; |
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| 64 | |||
| 65 | st = avformat_new_stream(s, NULL); |
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| 66 | if (!st) |
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| 67 | return AVERROR(ENOMEM); |
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| 68 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 69 | |||
| 70 | avio_skip(s->pb, 4); |
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| 71 | |||
| 72 | bom = avio_rb16(s->pb); |
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| 73 | if (bom != 0xFEFF && bom != 0xFFFE) { |
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| 74 | av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom); |
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| 75 | return AVERROR_INVALIDDATA; |
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| 76 | } |
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| 77 | if (bom == 0xFFFE) { |
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| 78 | avpriv_request_sample(s, "little endian byte order"); |
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| 79 | return AVERROR_PATCHWELCOME; |
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| 80 | } |
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| 81 | |||
| 82 | major = avio_r8(s->pb); |
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| 83 | minor = avio_r8(s->pb); |
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| 84 | avio_skip(s->pb, 4); // size of file |
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| 85 | size = avio_rb16(s->pb); |
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| 86 | if (size < 14) |
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| 87 | return AVERROR_INVALIDDATA; |
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| 88 | |||
| 89 | avio_skip(s->pb, size - 14); |
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| 90 | pos = avio_tell(s->pb); |
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| 91 | if (avio_rl32(s->pb) != MKTAG('H','E','A','D')) |
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| 92 | return AVERROR_INVALIDDATA; |
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| 93 | size = avio_rb32(s->pb); |
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| 94 | if (size < 256) |
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| 95 | return AVERROR_INVALIDDATA; |
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| 96 | avio_skip(s->pb, 4); // unknown |
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| 97 | h1offset = avio_rb32(s->pb); |
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| 98 | if (h1offset > size) |
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| 99 | return AVERROR_INVALIDDATA; |
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| 100 | avio_skip(s->pb, 12); |
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| 101 | toffset = avio_rb32(s->pb) + 16LL; |
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| 102 | if (toffset > size) |
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| 103 | return AVERROR_INVALIDDATA; |
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| 104 | |||
| 105 | avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb)); |
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| 106 | codec = avio_r8(s->pb); |
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| 107 | |||
| 108 | switch (codec) { |
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| 109 | case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break; |
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| 110 | case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break; |
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| 111 | case 2: codec = AV_CODEC_ID_ADPCM_THP; break; |
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| 112 | default: |
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| 113 | avpriv_request_sample(s, "codec %d", codec); |
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| 114 | return AVERROR_PATCHWELCOME; |
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| 115 | } |
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| 116 | |||
| 117 | avio_skip(s->pb, 1); // loop flag |
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| 118 | st->codec->codec_id = codec; |
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| 119 | st->codec->channels = avio_r8(s->pb); |
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| 120 | if (!st->codec->channels) |
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| 121 | return AVERROR_INVALIDDATA; |
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| 122 | |||
| 123 | avio_skip(s->pb, 1); // padding |
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| 124 | st->codec->sample_rate = avio_rb16(s->pb); |
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| 125 | if (!st->codec->sample_rate) |
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| 126 | return AVERROR_INVALIDDATA; |
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| 127 | |||
| 128 | avio_skip(s->pb, 2); // padding |
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| 129 | avio_skip(s->pb, 4); // loop start sample |
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| 130 | st->start_time = 0; |
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| 131 | st->duration = avio_rb32(s->pb); |
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| 132 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 133 | |||
| 134 | start = avio_rb32(s->pb); |
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| 135 | b->current_block = 0; |
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| 136 | b->block_count = avio_rb32(s->pb); |
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| 137 | if (b->block_count > UINT16_MAX) { |
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| 138 | av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count); |
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| 139 | return AVERROR_INVALIDDATA; |
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| 140 | } |
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| 141 | |||
| 142 | b->block_size = avio_rb32(s->pb); |
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| 143 | if (b->block_size > UINT16_MAX / st->codec->channels) |
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| 144 | return AVERROR_INVALIDDATA; |
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| 145 | b->block_size *= st->codec->channels; |
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| 146 | |||
| 147 | b->samples_per_block = avio_rb32(s->pb); |
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| 148 | b->last_block_used_bytes = avio_rb32(s->pb); |
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| 149 | if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels) |
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| 150 | return AVERROR_INVALIDDATA; |
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| 151 | b->last_block_used_bytes *= st->codec->channels; |
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| 152 | |||
| 153 | avio_skip(s->pb, 4); // last block samples |
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| 154 | avio_skip(s->pb, 4); // last block size |
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| 155 | |||
| 156 | if (codec == AV_CODEC_ID_ADPCM_THP) { |
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| 157 | int ch; |
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| 158 | |||
| 159 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); |
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| 160 | toffset = avio_rb32(s->pb) + 16LL; |
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| 161 | if (toffset > size) |
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| 162 | return AVERROR_INVALIDDATA; |
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| 163 | |||
| 164 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); |
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| 165 | b->table = av_mallocz(32 * st->codec->channels); |
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| 166 | if (!b->table) |
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| 167 | return AVERROR(ENOMEM); |
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| 168 | |||
| 169 | for (ch = 0; ch < st->codec->channels; ch++) { |
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| 170 | if (avio_read(s->pb, b->table + ch * 32, 32) != 32) { |
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| 171 | ret = AVERROR_INVALIDDATA; |
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| 172 | goto fail; |
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| 173 | } |
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| 174 | avio_skip(s->pb, 24); |
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| 175 | } |
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| 176 | } |
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| 177 | |||
| 178 | if (size < (avio_tell(s->pb) - pos)) { |
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| 179 | ret = AVERROR_INVALIDDATA; |
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| 180 | goto fail; |
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| 181 | } |
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| 182 | avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); |
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| 183 | |||
| 184 | while (!url_feof(s->pb)) { |
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| 185 | chunk = avio_rl32(s->pb); |
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| 186 | size = avio_rb32(s->pb); |
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| 187 | if (size < 8) { |
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| 188 | ret = AVERROR_INVALIDDATA; |
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| 189 | goto fail; |
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| 190 | } |
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| 191 | size -= 8; |
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| 192 | switch (chunk) { |
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| 193 | case MKTAG('A','D','P','C'): |
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| 194 | if (codec != AV_CODEC_ID_ADPCM_THP) |
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| 195 | goto skip; |
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| 196 | |||
| 197 | asize = b->block_count * st->codec->channels * 4; |
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| 198 | if (size < asize) { |
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| 199 | ret = AVERROR_INVALIDDATA; |
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| 200 | goto fail; |
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| 201 | } |
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| 202 | if (b->adpc) { |
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| 203 | av_log(s, AV_LOG_WARNING, "skipping additonal ADPC chunk\n"); |
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| 204 | goto skip; |
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| 205 | } else { |
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| 206 | b->adpc = av_mallocz(asize); |
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| 207 | if (!b->adpc) { |
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| 208 | ret = AVERROR(ENOMEM); |
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| 209 | goto fail; |
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| 210 | } |
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| 211 | avio_read(s->pb, b->adpc, asize); |
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| 212 | avio_skip(s->pb, size - asize); |
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| 213 | } |
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| 214 | break; |
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| 215 | case MKTAG('D','A','T','A'): |
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| 216 | if ((start < avio_tell(s->pb)) || |
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| 217 | (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) { |
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| 218 | ret = AVERROR_INVALIDDATA; |
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| 219 | goto fail; |
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| 220 | } |
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| 221 | avio_skip(s->pb, start - avio_tell(s->pb)); |
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| 222 | |||
| 223 | if (major != 1 || minor) |
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| 224 | avpriv_request_sample(s, "Version %d.%d", major, minor); |
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| 225 | |||
| 226 | return 0; |
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| 227 | default: |
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| 228 | av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk); |
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| 229 | skip: |
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| 230 | avio_skip(s->pb, size); |
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| 231 | } |
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| 232 | } |
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| 233 | |||
| 234 | fail: |
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| 235 | read_close(s); |
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| 236 | |||
| 237 | return ret; |
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| 238 | } |
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| 239 | |||
| 240 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 241 | { |
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| 242 | AVCodecContext *codec = s->streams[0]->codec; |
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| 243 | BRSTMDemuxContext *b = s->priv_data; |
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| 244 | uint32_t samples, size; |
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| 245 | int ret; |
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| 246 | |||
| 247 | if (url_feof(s->pb)) |
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| 248 | return AVERROR_EOF; |
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| 249 | b->current_block++; |
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| 250 | if (b->current_block == b->block_count) { |
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| 251 | size = b->last_block_used_bytes; |
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| 252 | samples = size / (8 * codec->channels) * 14; |
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| 253 | } else if (b->current_block < b->block_count) { |
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| 254 | size = b->block_size; |
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| 255 | samples = b->samples_per_block; |
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| 256 | } else { |
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| 257 | return AVERROR_EOF; |
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| 258 | } |
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| 259 | |||
| 260 | if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) { |
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| 261 | uint8_t *dst; |
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| 262 | |||
| 263 | if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0) |
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| 264 | return AVERROR(ENOMEM); |
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| 265 | dst = pkt->data; |
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| 266 | bytestream_put_be32(&dst, size); |
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| 267 | bytestream_put_be32(&dst, samples); |
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| 268 | bytestream_put_buffer(&dst, b->table, 32 * codec->channels); |
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| 269 | bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels * |
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| 270 | (b->current_block - 1), 4 * codec->channels); |
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| 271 | |||
| 272 | ret = avio_read(s->pb, dst, size); |
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| 273 | if (ret != size) |
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| 274 | av_free_packet(pkt); |
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| 275 | pkt->duration = samples; |
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| 276 | } else { |
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| 277 | ret = av_get_packet(s->pb, pkt, size); |
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| 278 | } |
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| 279 | |||
| 280 | pkt->stream_index = 0; |
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| 281 | |||
| 282 | if (ret != size) |
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| 283 | ret = AVERROR(EIO); |
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| 284 | |||
| 285 | return ret; |
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| 286 | } |
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| 287 | |||
| 288 | AVInputFormat ff_brstm_demuxer = { |
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| 289 | .name = "brstm", |
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| 290 | .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"), |
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| 291 | .priv_data_size = sizeof(BRSTMDemuxContext), |
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| 292 | .read_probe = probe, |
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| 293 | .read_header = read_header, |
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| 294 | .read_packet = read_packet, |
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| 295 | .read_close = read_close, |
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| 296 | .extensions = "brstm", |
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| 297 | }; |