/libavformat/rpl.c
C | 389 lines | 288 code | 44 blank | 57 comment | 85 complexity | e1ebb0d9c14564e8e77fb77fe1f876a7 MD5 | raw file
1/* 2 * ARMovie/RPL demuxer 3 * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman 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 <inttypes.h> 23#include <stdlib.h> 24 25#include "libavutil/avstring.h" 26#include "libavutil/dict.h" 27#include "avformat.h" 28#include "internal.h" 29 30#define RPL_SIGNATURE "ARMovie\x0A" 31#define RPL_SIGNATURE_SIZE 8 32 33/** 256 is arbitrary, but should be big enough for any reasonable file. */ 34#define RPL_LINE_LENGTH 256 35 36static int rpl_probe(const AVProbeData *p) 37{ 38 if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE)) 39 return 0; 40 41 return AVPROBE_SCORE_MAX; 42} 43 44typedef struct RPLContext { 45 // RPL header data 46 int32_t frames_per_chunk; 47 48 // Stream position data 49 uint32_t chunk_number; 50 uint32_t chunk_part; 51 uint32_t frame_in_part; 52} RPLContext; 53 54static int read_line(AVIOContext * pb, char* line, int bufsize) 55{ 56 int i; 57 for (i = 0; i < bufsize - 1; i++) { 58 int b = avio_r8(pb); 59 if (b == 0) 60 break; 61 if (b == '\n') { 62 line[i] = '\0'; 63 return avio_feof(pb) ? -1 : 0; 64 } 65 line[i] = b; 66 } 67 line[i] = '\0'; 68 return -1; 69} 70 71static int32_t read_int(const char* line, const char** endptr, int* error) 72{ 73 unsigned long result = 0; 74 for (; *line>='0' && *line<='9'; line++) { 75 if (result > (0x7FFFFFFF - 9) / 10) 76 *error = -1; 77 result = 10 * result + *line - '0'; 78 } 79 *endptr = line; 80 return result; 81} 82 83static int32_t read_line_and_int(AVIOContext * pb, int* error) 84{ 85 char line[RPL_LINE_LENGTH]; 86 const char *endptr; 87 *error |= read_line(pb, line, sizeof(line)); 88 return read_int(line, &endptr, error); 89} 90 91/** Parsing for fps, which can be a fraction. Unfortunately, 92 * the spec for the header leaves out a lot of details, 93 * so this is mostly guessing. 94 */ 95static AVRational read_fps(const char* line, int* error) 96{ 97 int64_t num, den = 1; 98 AVRational result; 99 num = read_int(line, &line, error); 100 if (*line == '.') 101 line++; 102 for (; *line>='0' && *line<='9'; line++) { 103 // Truncate any numerator too large to fit into an int64_t 104 if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10) 105 break; 106 num = 10 * num + *line - '0'; 107 den *= 10; 108 } 109 if (!num) 110 *error = -1; 111 av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF); 112 return result; 113} 114 115static int rpl_read_header(AVFormatContext *s) 116{ 117 AVIOContext *pb = s->pb; 118 RPLContext *rpl = s->priv_data; 119 AVStream *vst = NULL, *ast = NULL; 120 int total_audio_size; 121 int error = 0; 122 const char *endptr; 123 char audio_type[RPL_LINE_LENGTH]; 124 125 uint32_t i; 126 127 int32_t video_format, audio_format, chunk_catalog_offset, number_of_chunks; 128 AVRational fps; 129 130 char line[RPL_LINE_LENGTH]; 131 132 // The header for RPL/ARMovie files is 21 lines of text 133 // containing the various header fields. The fields are always 134 // in the same order, and other text besides the first 135 // number usually isn't important. 136 // (The spec says that there exists some significance 137 // for the text in a few cases; samples needed.) 138 error |= read_line(pb, line, sizeof(line)); // ARMovie 139 error |= read_line(pb, line, sizeof(line)); // movie name 140 av_dict_set(&s->metadata, "title" , line, 0); 141 error |= read_line(pb, line, sizeof(line)); // date/copyright 142 av_dict_set(&s->metadata, "copyright", line, 0); 143 error |= read_line(pb, line, sizeof(line)); // author and other 144 av_dict_set(&s->metadata, "author" , line, 0); 145 146 // video headers 147 video_format = read_line_and_int(pb, &error); 148 if (video_format) { 149 vst = avformat_new_stream(s, NULL); 150 if (!vst) 151 return AVERROR(ENOMEM); 152 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; 153 vst->codecpar->codec_tag = video_format; 154 vst->codecpar->width = read_line_and_int(pb, &error); // video width 155 vst->codecpar->height = read_line_and_int(pb, &error); // video height 156 vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample 157 158 // Figure out the video codec 159 switch (vst->codecpar->codec_tag) { 160#if 0 161 case 122: 162 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122; 163 break; 164#endif 165 case 124: 166 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE124; 167 // The header is wrong here, at least sometimes 168 vst->codecpar->bits_per_coded_sample = 16; 169 break; 170 case 130: 171 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE130; 172 break; 173 default: 174 avpriv_report_missing_feature(s, "Video format %s", 175 av_fourcc2str(vst->codecpar->codec_tag)); 176 vst->codecpar->codec_id = AV_CODEC_ID_NONE; 177 } 178 } else { 179 for (i = 0; i < 3; i++) 180 error |= read_line(pb, line, sizeof(line)); 181 } 182 183 error |= read_line(pb, line, sizeof(line)); // video frames per second 184 fps = read_fps(line, &error); 185 if (vst) 186 avpriv_set_pts_info(vst, 32, fps.den, fps.num); 187 188 // Audio headers 189 190 // ARMovie supports multiple audio tracks; I don't have any 191 // samples, though. This code will ignore additional tracks. 192 audio_format = read_line_and_int(pb, &error); // audio format ID 193 if (audio_format) { 194 ast = avformat_new_stream(s, NULL); 195 if (!ast) 196 return AVERROR(ENOMEM); 197 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 198 ast->codecpar->codec_tag = audio_format; 199 ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate 200 ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels 201 error |= read_line(pb, line, sizeof(line)); 202 ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample 203 av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH); 204 // At least one sample uses 0 for ADPCM, which is really 4 bits 205 // per sample. 206 if (ast->codecpar->bits_per_coded_sample == 0) 207 ast->codecpar->bits_per_coded_sample = 4; 208 209 ast->codecpar->bit_rate = ast->codecpar->sample_rate * 210 ast->codecpar->bits_per_coded_sample * 211 ast->codecpar->channels; 212 213 ast->codecpar->codec_id = AV_CODEC_ID_NONE; 214 switch (audio_format) { 215 case 1: 216 if (ast->codecpar->bits_per_coded_sample == 16) { 217 // 16-bit audio is always signed 218 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; 219 break; 220 } else if (ast->codecpar->bits_per_coded_sample == 8) { 221 if(av_stristr(audio_type, "unsigned") != NULL) { 222 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; 223 break; 224 } else if(av_stristr(audio_type, "linear") != NULL) { 225 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8; 226 break; 227 } else { 228 ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC; 229 break; 230 } 231 } 232 // There are some other formats listed as legal per the spec; 233 // samples needed. 234 break; 235 case 101: 236 if (ast->codecpar->bits_per_coded_sample == 8) { 237 // The samples with this kind of audio that I have 238 // are all unsigned. 239 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; 240 break; 241 } else if (ast->codecpar->bits_per_coded_sample == 4) { 242 ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD; 243 break; 244 } 245 break; 246 } 247 if (ast->codecpar->codec_id == AV_CODEC_ID_NONE) 248 avpriv_request_sample(s, "Audio format %"PRId32, 249 audio_format); 250 avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate); 251 } else { 252 for (i = 0; i < 3; i++) 253 error |= read_line(pb, line, sizeof(line)); 254 } 255 256 rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk 257 if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124) 258 av_log(s, AV_LOG_WARNING, 259 "Don't know how to split frames for video format %s. " 260 "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag)); 261 262 number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file 263 // The number in the header is actually the index of the last chunk. 264 number_of_chunks++; 265 266 error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes 267 error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes 268 chunk_catalog_offset = // offset of the "chunk catalog" 269 read_line_and_int(pb, &error); // (file index) 270 error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite 271 error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite 272 if (vst) { 273 error |= read_line(pb, line, sizeof(line)); // offset to key frame list 274 vst->duration = number_of_chunks * rpl->frames_per_chunk; 275 } 276 277 // Read the index 278 avio_seek(pb, chunk_catalog_offset, SEEK_SET); 279 total_audio_size = 0; 280 for (i = 0; !error && i < number_of_chunks; i++) { 281 int64_t offset, video_size, audio_size; 282 error |= read_line(pb, line, sizeof(line)); 283 if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64, 284 &offset, &video_size, &audio_size)) { 285 error = -1; 286 continue; 287 } 288 if (vst) 289 av_add_index_entry(vst, offset, i * rpl->frames_per_chunk, 290 video_size, rpl->frames_per_chunk, 0); 291 if (ast) 292 av_add_index_entry(ast, offset + video_size, total_audio_size, 293 audio_size, audio_size * 8, 0); 294 total_audio_size += audio_size * 8; 295 } 296 297 if (error) return AVERROR(EIO); 298 299 return 0; 300} 301 302static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt) 303{ 304 RPLContext *rpl = s->priv_data; 305 AVIOContext *pb = s->pb; 306 AVStream* stream; 307 AVIndexEntry* index_entry; 308 int ret; 309 310 if (rpl->chunk_part == s->nb_streams) { 311 rpl->chunk_number++; 312 rpl->chunk_part = 0; 313 } 314 315 stream = s->streams[rpl->chunk_part]; 316 317 if (rpl->chunk_number >= stream->nb_index_entries) 318 return AVERROR_EOF; 319 320 index_entry = &stream->index_entries[rpl->chunk_number]; 321 322 if (rpl->frame_in_part == 0) 323 if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0) 324 return AVERROR(EIO); 325 326 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && 327 stream->codecpar->codec_tag == 124) { 328 // We have to split Escape 124 frames because there are 329 // multiple frames per chunk in Escape 124 samples. 330 uint32_t frame_size; 331 332 avio_skip(pb, 4); /* flags */ 333 frame_size = avio_rl32(pb); 334 if (avio_seek(pb, -8, SEEK_CUR) < 0) 335 return AVERROR(EIO); 336 337 ret = av_get_packet(pb, pkt, frame_size); 338 if (ret < 0) 339 return ret; 340 if (ret != frame_size) { 341 return AVERROR(EIO); 342 } 343 pkt->duration = 1; 344 pkt->pts = index_entry->timestamp + rpl->frame_in_part; 345 pkt->stream_index = rpl->chunk_part; 346 347 rpl->frame_in_part++; 348 if (rpl->frame_in_part == rpl->frames_per_chunk) { 349 rpl->frame_in_part = 0; 350 rpl->chunk_part++; 351 } 352 } else { 353 ret = av_get_packet(pb, pkt, index_entry->size); 354 if (ret < 0) 355 return ret; 356 if (ret != index_entry->size) { 357 return AVERROR(EIO); 358 } 359 360 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { 361 // frames_per_chunk should always be one here; the header 362 // parsing will warn if it isn't. 363 pkt->duration = rpl->frames_per_chunk; 364 } else { 365 // All the audio codecs supported in this container 366 // (at least so far) are constant-bitrate. 367 pkt->duration = ret * 8; 368 } 369 pkt->pts = index_entry->timestamp; 370 pkt->stream_index = rpl->chunk_part; 371 rpl->chunk_part++; 372 } 373 374 // None of the Escape formats have keyframes, and the ADPCM 375 // format used doesn't have keyframes. 376 if (rpl->chunk_number == 0 && rpl->frame_in_part == 0) 377 pkt->flags |= AV_PKT_FLAG_KEY; 378 379 return ret; 380} 381 382AVInputFormat ff_rpl_demuxer = { 383 .name = "rpl", 384 .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"), 385 .priv_data_size = sizeof(RPLContext), 386 .read_probe = rpl_probe, 387 .read_header = rpl_read_header, 388 .read_packet = rpl_read_packet, 389};