| 1 | /* |
| 2 | * BRSTM demuxer |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 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 | #include "libavutil/intreadwrite.h" |
| 23 | #include "libavcodec/bytestream.h" |
| 24 | #include "avformat.h" |
| 25 | #include "internal.h" |
| 26 | |
| 27 | typedef struct BRSTMDemuxContext { |
| 28 | uint32_t block_size; |
| 29 | uint32_t block_count; |
| 30 | uint32_t current_block; |
| 31 | uint32_t samples_per_block; |
| 32 | uint32_t last_block_used_bytes; |
| 33 | uint8_t *table; |
| 34 | uint8_t *adpc; |
| 35 | } BRSTMDemuxContext; |
| 36 | |
| 37 | static int probe(AVProbeData *p) |
| 38 | { |
| 39 | if (AV_RL32(p->buf) == MKTAG('R','S','T','M') && |
| 40 | (AV_RL16(p->buf + 4) == 0xFFFE || |
| 41 | AV_RL16(p->buf + 4) == 0xFEFF)) |
| 42 | return AVPROBE_SCORE_MAX / 3 * 2; |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static int read_close(AVFormatContext *s) |
| 47 | { |
| 48 | BRSTMDemuxContext *b = s->priv_data; |
| 49 | |
| 50 | av_freep(&b->table); |
| 51 | av_freep(&b->adpc); |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int read_header(AVFormatContext *s) |
| 57 | { |
| 58 | BRSTMDemuxContext *b = s->priv_data; |
| 59 | int bom, major, minor, codec, chunk; |
| 60 | int64_t pos, h1offset, toffset; |
| 61 | uint32_t size, start, asize; |
| 62 | AVStream *st; |
| 63 | int ret = AVERROR_EOF; |
| 64 | |
| 65 | st = avformat_new_stream(s, NULL); |
| 66 | if (!st) |
| 67 | return AVERROR(ENOMEM); |
| 68 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 69 | |
| 70 | avio_skip(s->pb, 4); |
| 71 | |
| 72 | bom = avio_rb16(s->pb); |
| 73 | if (bom != 0xFEFF && bom != 0xFFFE) { |
| 74 | av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom); |
| 75 | return AVERROR_INVALIDDATA; |
| 76 | } |
| 77 | if (bom == 0xFFFE) { |
| 78 | avpriv_request_sample(s, "little endian byte order"); |
| 79 | return AVERROR_PATCHWELCOME; |
| 80 | } |
| 81 | |
| 82 | major = avio_r8(s->pb); |
| 83 | minor = avio_r8(s->pb); |
| 84 | avio_skip(s->pb, 4); // size of file |
| 85 | size = avio_rb16(s->pb); |
| 86 | if (size < 14) |
| 87 | return AVERROR_INVALIDDATA; |
| 88 | |
| 89 | avio_skip(s->pb, size - 14); |
| 90 | pos = avio_tell(s->pb); |
| 91 | if (avio_rl32(s->pb) != MKTAG('H','E','A','D')) |
| 92 | return AVERROR_INVALIDDATA; |
| 93 | size = avio_rb32(s->pb); |
| 94 | if (size < 256) |
| 95 | return AVERROR_INVALIDDATA; |
| 96 | avio_skip(s->pb, 4); // unknown |
| 97 | h1offset = avio_rb32(s->pb); |
| 98 | if (h1offset > size) |
| 99 | return AVERROR_INVALIDDATA; |
| 100 | avio_skip(s->pb, 12); |
| 101 | toffset = avio_rb32(s->pb) + 16LL; |
| 102 | if (toffset > size) |
| 103 | return AVERROR_INVALIDDATA; |
| 104 | |
| 105 | avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb)); |
| 106 | codec = avio_r8(s->pb); |
| 107 | |
| 108 | switch (codec) { |
| 109 | case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break; |
| 110 | case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break; |
| 111 | case 2: codec = AV_CODEC_ID_ADPCM_THP; break; |
| 112 | default: |
| 113 | avpriv_request_sample(s, "codec %d", codec); |
| 114 | return AVERROR_PATCHWELCOME; |
| 115 | } |
| 116 | |
| 117 | avio_skip(s->pb, 1); // loop flag |
| 118 | st->codec->codec_id = codec; |
| 119 | st->codec->channels = avio_r8(s->pb); |
| 120 | if (!st->codec->channels) |
| 121 | return AVERROR_INVALIDDATA; |
| 122 | |
| 123 | avio_skip(s->pb, 1); // padding |
| 124 | st->codec->sample_rate = avio_rb16(s->pb); |
| 125 | if (!st->codec->sample_rate) |
| 126 | return AVERROR_INVALIDDATA; |
| 127 | |
| 128 | avio_skip(s->pb, 2); // padding |
| 129 | avio_skip(s->pb, 4); // loop start sample |
| 130 | st->start_time = 0; |
| 131 | st->duration = avio_rb32(s->pb); |
| 132 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 133 | |
| 134 | start = avio_rb32(s->pb); |
| 135 | b->current_block = 0; |
| 136 | b->block_count = avio_rb32(s->pb); |
| 137 | if (b->block_count > UINT16_MAX) { |
| 138 | av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count); |
| 139 | return AVERROR_INVALIDDATA; |
| 140 | } |
| 141 | |
| 142 | b->block_size = avio_rb32(s->pb); |
| 143 | if (b->block_size > UINT16_MAX / st->codec->channels) |
| 144 | return AVERROR_INVALIDDATA; |
| 145 | b->block_size *= st->codec->channels; |
| 146 | |
| 147 | b->samples_per_block = avio_rb32(s->pb); |
| 148 | b->last_block_used_bytes = avio_rb32(s->pb); |
| 149 | if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels) |
| 150 | return AVERROR_INVALIDDATA; |
| 151 | b->last_block_used_bytes *= st->codec->channels; |
| 152 | |
| 153 | avio_skip(s->pb, 4); // last block samples |
| 154 | avio_skip(s->pb, 4); // last block size |
| 155 | |
| 156 | if (codec == AV_CODEC_ID_ADPCM_THP) { |
| 157 | int ch; |
| 158 | |
| 159 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); |
| 160 | toffset = avio_rb32(s->pb) + 16LL; |
| 161 | if (toffset > size) |
| 162 | return AVERROR_INVALIDDATA; |
| 163 | |
| 164 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); |
| 165 | b->table = av_mallocz(32 * st->codec->channels); |
| 166 | if (!b->table) |
| 167 | return AVERROR(ENOMEM); |
| 168 | |
| 169 | for (ch = 0; ch < st->codec->channels; ch++) { |
| 170 | if (avio_read(s->pb, b->table + ch * 32, 32) != 32) { |
| 171 | ret = AVERROR_INVALIDDATA; |
| 172 | goto fail; |
| 173 | } |
| 174 | avio_skip(s->pb, 24); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | if (size < (avio_tell(s->pb) - pos)) { |
| 179 | ret = AVERROR_INVALIDDATA; |
| 180 | goto fail; |
| 181 | } |
| 182 | avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); |
| 183 | |
| 184 | while (!avio_feof(s->pb)) { |
| 185 | chunk = avio_rl32(s->pb); |
| 186 | size = avio_rb32(s->pb); |
| 187 | if (size < 8) { |
| 188 | ret = AVERROR_INVALIDDATA; |
| 189 | goto fail; |
| 190 | } |
| 191 | size -= 8; |
| 192 | switch (chunk) { |
| 193 | case MKTAG('A','D','P','C'): |
| 194 | if (codec != AV_CODEC_ID_ADPCM_THP) |
| 195 | goto skip; |
| 196 | |
| 197 | asize = b->block_count * st->codec->channels * 4; |
| 198 | if (size < asize) { |
| 199 | ret = AVERROR_INVALIDDATA; |
| 200 | goto fail; |
| 201 | } |
| 202 | if (b->adpc) { |
| 203 | av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n"); |
| 204 | goto skip; |
| 205 | } else { |
| 206 | b->adpc = av_mallocz(asize); |
| 207 | if (!b->adpc) { |
| 208 | ret = AVERROR(ENOMEM); |
| 209 | goto fail; |
| 210 | } |
| 211 | avio_read(s->pb, b->adpc, asize); |
| 212 | avio_skip(s->pb, size - asize); |
| 213 | } |
| 214 | break; |
| 215 | case MKTAG('D','A','T','A'): |
| 216 | if ((start < avio_tell(s->pb)) || |
| 217 | (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) { |
| 218 | ret = AVERROR_INVALIDDATA; |
| 219 | goto fail; |
| 220 | } |
| 221 | avio_skip(s->pb, start - avio_tell(s->pb)); |
| 222 | |
| 223 | if (major != 1 || minor) |
| 224 | avpriv_request_sample(s, "Version %d.%d", major, minor); |
| 225 | |
| 226 | return 0; |
| 227 | default: |
| 228 | av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk); |
| 229 | skip: |
| 230 | avio_skip(s->pb, size); |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | fail: |
| 235 | read_close(s); |
| 236 | |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
| 241 | { |
| 242 | AVCodecContext *codec = s->streams[0]->codec; |
| 243 | BRSTMDemuxContext *b = s->priv_data; |
| 244 | uint32_t samples, size; |
| 245 | int ret; |
| 246 | |
| 247 | if (avio_feof(s->pb)) |
| 248 | return AVERROR_EOF; |
| 249 | b->current_block++; |
| 250 | if (b->current_block == b->block_count) { |
| 251 | size = b->last_block_used_bytes; |
| 252 | samples = size / (8 * codec->channels) * 14; |
| 253 | } else if (b->current_block < b->block_count) { |
| 254 | size = b->block_size; |
| 255 | samples = b->samples_per_block; |
| 256 | } else { |
| 257 | return AVERROR_EOF; |
| 258 | } |
| 259 | |
| 260 | if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) { |
| 261 | uint8_t *dst; |
| 262 | |
| 263 | if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0) |
| 264 | return AVERROR(ENOMEM); |
| 265 | dst = pkt->data; |
| 266 | bytestream_put_be32(&dst, size); |
| 267 | bytestream_put_be32(&dst, samples); |
| 268 | bytestream_put_buffer(&dst, b->table, 32 * codec->channels); |
| 269 | bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels * |
| 270 | (b->current_block - 1), 4 * codec->channels); |
| 271 | |
| 272 | ret = avio_read(s->pb, dst, size); |
| 273 | if (ret != size) |
| 274 | av_free_packet(pkt); |
| 275 | pkt->duration = samples; |
| 276 | } else { |
| 277 | ret = av_get_packet(s->pb, pkt, size); |
| 278 | } |
| 279 | |
| 280 | pkt->stream_index = 0; |
| 281 | |
| 282 | if (ret != size) |
| 283 | ret = AVERROR(EIO); |
| 284 | |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | AVInputFormat ff_brstm_demuxer = { |
| 289 | .name = "brstm", |
| 290 | .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"), |
| 291 | .priv_data_size = sizeof(BRSTMDemuxContext), |
| 292 | .read_probe = probe, |
| 293 | .read_header = read_header, |
| 294 | .read_packet = read_packet, |
| 295 | .read_close = read_close, |
| 296 | .extensions = "brstm", |
| 297 | }; |