| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MOFLEX demuxer | ||
| 3 | * Copyright (c) 2015-2016 Florian Nouwt | ||
| 4 | * Copyright (c) 2017 Adib Surani | ||
| 5 | * Copyright (c) 2020 Paul B Mahol | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 9 | * FFmpeg is free software; you can redistribute it and/or | ||
| 10 | * modify it under the terms of the GNU Lesser General Public | ||
| 11 | * License as published by the Free Software Foundation; either | ||
| 12 | * version 2.1 of the License, or (at your option) any later version. | ||
| 13 | * | ||
| 14 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 17 | * Lesser General Public License for more details. | ||
| 18 | * | ||
| 19 | * You should have received a copy of the GNU Lesser General Public | ||
| 20 | * License along with FFmpeg; if not, write to the Free Software | ||
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 22 | */ | ||
| 23 | |||
| 24 | #include "libavcodec/bytestream.h" | ||
| 25 | |||
| 26 | #include "avformat.h" | ||
| 27 | #include "demux.h" | ||
| 28 | #include "internal.h" | ||
| 29 | |||
| 30 | typedef struct BitReader { | ||
| 31 | unsigned last; | ||
| 32 | unsigned pos; | ||
| 33 | } BitReader; | ||
| 34 | |||
| 35 | typedef struct MOFLEXDemuxContext { | ||
| 36 | unsigned size; | ||
| 37 | int64_t pos; | ||
| 38 | int64_t ts; | ||
| 39 | int flags; | ||
| 40 | int in_block; | ||
| 41 | |||
| 42 | BitReader br; | ||
| 43 | } MOFLEXDemuxContext; | ||
| 44 | |||
| 45 | ✗ | static int pop(BitReader *br, AVIOContext *pb) | |
| 46 | { | ||
| 47 | ✗ | if (avio_feof(pb)) | |
| 48 | ✗ | return AVERROR_EOF; | |
| 49 | |||
| 50 | ✗ | if ((br->pos & 7) == 0) | |
| 51 | ✗ | br->last = (unsigned)avio_r8(pb) << 24U; | |
| 52 | else | ||
| 53 | ✗ | br->last <<= 1; | |
| 54 | |||
| 55 | ✗ | br->pos++; | |
| 56 | ✗ | return !!(br->last & 0x80000000); | |
| 57 | } | ||
| 58 | |||
| 59 | ✗ | static int pop_int(BitReader *br, AVIOContext *pb, int n) | |
| 60 | { | ||
| 61 | ✗ | int value = 0; | |
| 62 | |||
| 63 | ✗ | for (int i = 0; i < n; i++) { | |
| 64 | ✗ | int ret = pop(br, pb); | |
| 65 | |||
| 66 | ✗ | if (ret < 0) | |
| 67 | ✗ | return ret; | |
| 68 | ✗ | if (ret > INT_MAX - value - value) | |
| 69 | ✗ | return AVERROR_INVALIDDATA; | |
| 70 | ✗ | value = 2 * value + ret; | |
| 71 | } | ||
| 72 | |||
| 73 | ✗ | return value; | |
| 74 | } | ||
| 75 | |||
| 76 | ✗ | static int pop_length(BitReader *br, AVIOContext *pb) | |
| 77 | { | ||
| 78 | ✗ | int ret, n = 1; | |
| 79 | |||
| 80 | ✗ | while ((ret = pop(br, pb)) == 0) | |
| 81 | ✗ | n++; | |
| 82 | |||
| 83 | ✗ | if (ret < 0) | |
| 84 | ✗ | return ret; | |
| 85 | ✗ | return n; | |
| 86 | } | ||
| 87 | |||
| 88 | ✗ | static int read_var_byte(AVFormatContext *s, unsigned *out) | |
| 89 | { | ||
| 90 | ✗ | AVIOContext *pb = s->pb; | |
| 91 | ✗ | unsigned value = 0, data; | |
| 92 | |||
| 93 | ✗ | data = avio_r8(pb); | |
| 94 | ✗ | if (!(data & 0x80)) { | |
| 95 | ✗ | *out = data; | |
| 96 | ✗ | return 0; | |
| 97 | } | ||
| 98 | |||
| 99 | ✗ | value = (data & 0x7F) << 7; | |
| 100 | ✗ | data = avio_r8(pb); | |
| 101 | ✗ | if (!(data & 0x80)) { | |
| 102 | ✗ | value |= data; | |
| 103 | ✗ | *out = value; | |
| 104 | ✗ | return 0; | |
| 105 | } | ||
| 106 | |||
| 107 | ✗ | value = ((data & 0x7F) | value) << 7; | |
| 108 | ✗ | data = avio_r8(pb); | |
| 109 | ✗ | if (!(data & 0x80)) { | |
| 110 | ✗ | value |= data; | |
| 111 | ✗ | *out = value; | |
| 112 | ✗ | return 0; | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | value = (((data & 0x7F) | value) << 7) | avio_r8(pb); | |
| 116 | ✗ | *out = value; | |
| 117 | |||
| 118 | ✗ | return 0; | |
| 119 | } | ||
| 120 | |||
| 121 | 7186 | static int moflex_probe(const AVProbeData *p) | |
| 122 | { | ||
| 123 | GetByteContext gb; | ||
| 124 | 7186 | int score = 0; | |
| 125 | |||
| 126 | 7186 | bytestream2_init(&gb, p->buf, p->buf_size); | |
| 127 | |||
| 128 |
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7186 | if (bytestream2_get_be16(&gb) != 0x4C32) |
| 129 | 7186 | return 0; | |
| 130 | ✗ | score += 10; | |
| 131 | |||
| 132 | ✗ | bytestream2_skip(&gb, 10); | |
| 133 | ✗ | if (bytestream2_get_be16(&gb) == 0) | |
| 134 | ✗ | return 0; | |
| 135 | ✗ | score += 5; | |
| 136 | |||
| 137 | ✗ | while (bytestream2_get_bytes_left(&gb) > 0) { | |
| 138 | ✗ | int type = bytestream2_get_byte(&gb); | |
| 139 | ✗ | int size = bytestream2_get_byte(&gb); | |
| 140 | |||
| 141 | ✗ | if (type == 0) { | |
| 142 | ✗ | score += 5 * (size == 0); | |
| 143 | ✗ | break; | |
| 144 | } | ||
| 145 | ✗ | if ((type == 1 && size == 12) || | |
| 146 | ✗ | (type == 2 && size == 6) || | |
| 147 | ✗ | (type == 3 && size == 13) || | |
| 148 | ✗ | (type == 4 && size == 2)) | |
| 149 | ✗ | score += 20; | |
| 150 | ✗ | bytestream2_skip(&gb, size); | |
| 151 | } | ||
| 152 | |||
| 153 | ✗ | return FFMIN(AVPROBE_SCORE_MAX, score); | |
| 154 | } | ||
| 155 | |||
| 156 | ✗ | static int moflex_read_sync(AVFormatContext *s) | |
| 157 | { | ||
| 158 | ✗ | MOFLEXDemuxContext *m = s->priv_data; | |
| 159 | ✗ | AVIOContext *pb = s->pb; | |
| 160 | |||
| 161 | ✗ | if (avio_rb16(pb) != 0x4C32) { | |
| 162 | ✗ | if (avio_feof(pb)) | |
| 163 | ✗ | return AVERROR_EOF; | |
| 164 | ✗ | avio_seek(pb, -2, SEEK_CUR); | |
| 165 | ✗ | return 1; | |
| 166 | } | ||
| 167 | |||
| 168 | ✗ | avio_skip(pb, 2); | |
| 169 | ✗ | m->ts = avio_rb64(pb); | |
| 170 | ✗ | m->size = avio_rb16(pb) + 1; | |
| 171 | |||
| 172 | ✗ | while (!avio_feof(pb)) { | |
| 173 | ✗ | unsigned type, ssize, codec_id = 0; | |
| 174 | ✗ | unsigned codec_type, width = 0, height = 0, sample_rate = 0, channels = 0; | |
| 175 | ✗ | int stream_index = -1; | |
| 176 | ✗ | AVRational tb = av_make_q(0, 1); | |
| 177 | |||
| 178 | ✗ | read_var_byte(s, &type); | |
| 179 | ✗ | read_var_byte(s, &ssize); | |
| 180 | |||
| 181 | ✗ | switch (type) { | |
| 182 | ✗ | case 0: | |
| 183 | ✗ | if (ssize > 0) | |
| 184 | ✗ | avio_skip(pb, ssize); | |
| 185 | ✗ | return 0; | |
| 186 | ✗ | case 2: | |
| 187 | ✗ | codec_type = AVMEDIA_TYPE_AUDIO; | |
| 188 | ✗ | stream_index = avio_r8(pb); | |
| 189 | ✗ | codec_id = avio_r8(pb); | |
| 190 | ✗ | switch (codec_id) { | |
| 191 | ✗ | case 0: codec_id = AV_CODEC_ID_FASTAUDIO; break; | |
| 192 | ✗ | case 1: codec_id = AV_CODEC_ID_ADPCM_IMA_MOFLEX; break; | |
| 193 | ✗ | case 2: codec_id = AV_CODEC_ID_PCM_S16LE; break; | |
| 194 | ✗ | default: | |
| 195 | ✗ | av_log(s, AV_LOG_ERROR, "Unsupported audio codec: %d\n", codec_id); | |
| 196 | ✗ | return AVERROR_PATCHWELCOME; | |
| 197 | } | ||
| 198 | ✗ | sample_rate = avio_rb24(pb) + 1; | |
| 199 | ✗ | tb = av_make_q(1, sample_rate); | |
| 200 | ✗ | channels = avio_r8(pb) + 1; | |
| 201 | ✗ | break; | |
| 202 | ✗ | case 1: | |
| 203 | case 3: | ||
| 204 | ✗ | codec_type = AVMEDIA_TYPE_VIDEO; | |
| 205 | ✗ | stream_index = avio_r8(pb); | |
| 206 | ✗ | codec_id = avio_r8(pb); | |
| 207 | ✗ | switch (codec_id) { | |
| 208 | ✗ | case 0: codec_id = AV_CODEC_ID_MOBICLIP; break; | |
| 209 | ✗ | default: | |
| 210 | ✗ | av_log(s, AV_LOG_ERROR, "Unsupported video codec: %d\n", codec_id); | |
| 211 | ✗ | return AVERROR_PATCHWELCOME; | |
| 212 | } | ||
| 213 | ✗ | tb.den = avio_rb16(pb); | |
| 214 | ✗ | tb.num = avio_rb16(pb); | |
| 215 | ✗ | width = avio_rb16(pb); | |
| 216 | ✗ | height = avio_rb16(pb); | |
| 217 | ✗ | avio_skip(pb, type == 3 ? 3 : 2); | |
| 218 | ✗ | break; | |
| 219 | ✗ | case 4: | |
| 220 | ✗ | codec_type = AVMEDIA_TYPE_DATA; | |
| 221 | ✗ | stream_index = avio_r8(pb); | |
| 222 | ✗ | avio_skip(pb, 1); | |
| 223 | ✗ | break; | |
| 224 | } | ||
| 225 | |||
| 226 | ✗ | if (stream_index == s->nb_streams) { | |
| 227 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 228 | |||
| 229 | ✗ | if (!st) | |
| 230 | ✗ | return AVERROR(ENOMEM); | |
| 231 | |||
| 232 | ✗ | st->codecpar->codec_type = codec_type; | |
| 233 | ✗ | st->codecpar->codec_id = codec_id; | |
| 234 | ✗ | st->codecpar->width = width; | |
| 235 | ✗ | st->codecpar->height = height; | |
| 236 | ✗ | st->codecpar->sample_rate= sample_rate; | |
| 237 | ✗ | st->codecpar->ch_layout.nb_channels = channels; | |
| 238 | ✗ | st->priv_data = av_packet_alloc(); | |
| 239 | ✗ | if (!st->priv_data) | |
| 240 | ✗ | return AVERROR(ENOMEM); | |
| 241 | |||
| 242 | ✗ | if (tb.num) | |
| 243 | ✗ | avpriv_set_pts_info(st, 63, tb.num, tb.den); | |
| 244 | } | ||
| 245 | } | ||
| 246 | |||
| 247 | ✗ | return 0; | |
| 248 | } | ||
| 249 | |||
| 250 | ✗ | static int moflex_read_header(AVFormatContext *s) | |
| 251 | { | ||
| 252 | int ret; | ||
| 253 | |||
| 254 | ✗ | ret = moflex_read_sync(s); | |
| 255 | ✗ | if (ret < 0) | |
| 256 | ✗ | return ret; | |
| 257 | |||
| 258 | ✗ | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
| 259 | ✗ | avio_seek(s->pb, 0, SEEK_SET); | |
| 260 | |||
| 261 | ✗ | return 0; | |
| 262 | } | ||
| 263 | |||
| 264 | ✗ | static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 265 | { | ||
| 266 | ✗ | MOFLEXDemuxContext *m = s->priv_data; | |
| 267 | ✗ | AVIOContext *pb = s->pb; | |
| 268 | ✗ | BitReader *br = &m->br; | |
| 269 | int ret; | ||
| 270 | |||
| 271 | ✗ | while (!avio_feof(pb)) { | |
| 272 | ✗ | if (!m->in_block) { | |
| 273 | ✗ | m->pos = avio_tell(pb); | |
| 274 | |||
| 275 | ✗ | ret = moflex_read_sync(s); | |
| 276 | ✗ | if (ret < 0) | |
| 277 | ✗ | return ret; | |
| 278 | |||
| 279 | ✗ | m->flags = avio_r8(pb); | |
| 280 | ✗ | if (m->flags & 2) | |
| 281 | ✗ | avio_skip(pb, 2); | |
| 282 | } | ||
| 283 | |||
| 284 | ✗ | while ((avio_tell(pb) < m->pos + m->size) && !avio_feof(pb) && avio_r8(pb)) { | |
| 285 | int stream_index, bits, pkt_size, endframe; | ||
| 286 | AVPacket *packet; | ||
| 287 | |||
| 288 | ✗ | m->in_block = 1; | |
| 289 | |||
| 290 | ✗ | avio_seek(pb, -1, SEEK_CUR); | |
| 291 | ✗ | br->pos = br->last = 0; | |
| 292 | |||
| 293 | ✗ | bits = pop_length(br, pb); | |
| 294 | ✗ | if (bits < 0) | |
| 295 | ✗ | return bits; | |
| 296 | ✗ | stream_index = pop_int(br, pb, bits); | |
| 297 | ✗ | if (stream_index < 0) | |
| 298 | ✗ | return stream_index; | |
| 299 | ✗ | if (stream_index >= s->nb_streams) | |
| 300 | ✗ | return AVERROR_INVALIDDATA; | |
| 301 | |||
| 302 | ✗ | endframe = pop(br, pb); | |
| 303 | ✗ | if (endframe < 0) | |
| 304 | ✗ | return endframe; | |
| 305 | ✗ | if (endframe) { | |
| 306 | ✗ | bits = pop_length(br, pb); | |
| 307 | ✗ | if (bits < 0) | |
| 308 | ✗ | return bits; | |
| 309 | ✗ | pop_int(br, pb, bits); | |
| 310 | ✗ | pop(br, pb); | |
| 311 | ✗ | bits = pop_length(br, pb); | |
| 312 | ✗ | if (bits < 0) | |
| 313 | ✗ | return bits; | |
| 314 | ✗ | pop_int(br, pb, bits * 2 + 26); | |
| 315 | } | ||
| 316 | |||
| 317 | ✗ | pkt_size = pop_int(br, pb, 13) + 1; | |
| 318 | ✗ | if (pkt_size > m->size) | |
| 319 | ✗ | return AVERROR_INVALIDDATA; | |
| 320 | ✗ | packet = s->streams[stream_index]->priv_data; | |
| 321 | ✗ | if (!packet) { | |
| 322 | ✗ | avio_skip(pb, pkt_size); | |
| 323 | ✗ | continue; | |
| 324 | } | ||
| 325 | |||
| 326 | ✗ | ret = av_append_packet(pb, packet, pkt_size); | |
| 327 | ✗ | if (ret < 0) | |
| 328 | ✗ | return ret; | |
| 329 | ✗ | if (endframe && packet->size > 0) { | |
| 330 | ✗ | av_packet_move_ref(pkt, packet); | |
| 331 | ✗ | pkt->pos = m->pos; | |
| 332 | ✗ | pkt->stream_index = stream_index; | |
| 333 | ✗ | if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { | |
| 334 | ✗ | pkt->duration = 1; | |
| 335 | ✗ | if (pkt->data[0] & 0x80) | |
| 336 | ✗ | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 337 | } else { | ||
| 338 | ✗ | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 339 | } | ||
| 340 | ✗ | return ret; | |
| 341 | } | ||
| 342 | } | ||
| 343 | |||
| 344 | ✗ | m->in_block = 0; | |
| 345 | |||
| 346 | ✗ | if (m->flags % 2 == 0) { | |
| 347 | ✗ | if (m->size <= 0) | |
| 348 | ✗ | return AVERROR_INVALIDDATA; | |
| 349 | ✗ | avio_seek(pb, m->pos + m->size, SEEK_SET); | |
| 350 | } | ||
| 351 | } | ||
| 352 | |||
| 353 | ✗ | return AVERROR_EOF; | |
| 354 | } | ||
| 355 | |||
| 356 | ✗ | static int moflex_read_seek(AVFormatContext *s, int stream_index, | |
| 357 | int64_t pts, int flags) | ||
| 358 | { | ||
| 359 | ✗ | MOFLEXDemuxContext *m = s->priv_data; | |
| 360 | |||
| 361 | ✗ | m->in_block = 0; | |
| 362 | |||
| 363 | ✗ | return -1; | |
| 364 | } | ||
| 365 | |||
| 366 | ✗ | static int moflex_read_close(AVFormatContext *s) | |
| 367 | { | ||
| 368 | ✗ | for (int i = 0; i < s->nb_streams; i++) { | |
| 369 | ✗ | av_packet_free((AVPacket **)&s->streams[i]->priv_data); | |
| 370 | } | ||
| 371 | |||
| 372 | ✗ | return 0; | |
| 373 | } | ||
| 374 | |||
| 375 | const FFInputFormat ff_moflex_demuxer = { | ||
| 376 | .p.name = "moflex", | ||
| 377 | .p.long_name = NULL_IF_CONFIG_SMALL("MobiClip MOFLEX"), | ||
| 378 | .p.extensions = "moflex", | ||
| 379 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 380 | .priv_data_size = sizeof(MOFLEXDemuxContext), | ||
| 381 | .read_probe = moflex_probe, | ||
| 382 | .read_header = moflex_read_header, | ||
| 383 | .read_packet = moflex_read_packet, | ||
| 384 | .read_seek = moflex_read_seek, | ||
| 385 | .read_close = moflex_read_close, | ||
| 386 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 387 | }; | ||
| 388 |