1/* 2 * "Real" compatible muxer. 3 * Copyright (c) 2000, 2001 Fabrice Bellard 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21#include "avformat.h" 22#include "avio_internal.h" 23#include "rm.h" 24#include "libavutil/dict.h" 25 26typedef struct { 27 int nb_packets; 28 int packet_total_size; 29 int packet_max_size; 30 /* codec related output */ 31 int bit_rate; 32 float frame_rate; 33 int nb_frames; /* current frame number */ 34 int total_frames; /* total number of frames */ 35 int num; 36 AVCodecContext *enc; 37} StreamInfo; 38 39typedef struct { 40 StreamInfo streams[2]; 41 StreamInfo *audio_stream, *video_stream; 42 int data_pos; /* position of the data after the header */ 43} RMMuxContext; 44 45/* in ms */ 46#define BUFFER_DURATION 0 47 48 49static void put_str(AVIOContext *s, const char *tag) 50{ 51 avio_wb16(s,strlen(tag)); 52 while (*tag) { 53 avio_w8(s, *tag++); 54 } 55} 56 57static void put_str8(AVIOContext *s, const char *tag) 58{ 59 avio_w8(s, strlen(tag)); 60 while (*tag) { 61 avio_w8(s, *tag++); 62 } 63} 64 65static int rv10_write_header(AVFormatContext *ctx, 66 int data_size, int index_pos) 67{ 68 RMMuxContext *rm = ctx->priv_data; 69 AVIOContext *s = ctx->pb; 70 StreamInfo *stream; 71 unsigned char *data_offset_ptr, *start_ptr; 72 const char *desc, *mimetype; 73 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i; 74 int bit_rate, v, duration, flags, data_pos; 75 AVDictionaryEntry *tag; 76 77 start_ptr = s->buf_ptr; 78 79 ffio_wfourcc(s, ".RMF"); 80 avio_wb32(s,18); /* header size */ 81 avio_wb16(s,0); 82 avio_wb32(s,0); 83 avio_wb32(s,4 + ctx->nb_streams); /* num headers */ 84 85 ffio_wfourcc(s,"PROP"); 86 avio_wb32(s, 50); 87 avio_wb16(s, 0); 88 packet_max_size = 0; 89 packet_total_size = 0; 90 nb_packets = 0; 91 bit_rate = 0; 92 duration = 0; 93 for(i=0;i<ctx->nb_streams;i++) { 94 StreamInfo *stream = &rm->streams[i]; 95 bit_rate += stream->bit_rate; 96 if (stream->packet_max_size > packet_max_size) 97 packet_max_size = stream->packet_max_size; 98 nb_packets += stream->nb_packets; 99 packet_total_size += stream->packet_total_size; 100 /* select maximum duration */ 101 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate); 102 if (v > duration) 103 duration = v; 104 } 105 avio_wb32(s, bit_rate); /* max bit rate */ 106 avio_wb32(s, bit_rate); /* avg bit rate */ 107 avio_wb32(s, packet_max_size); /* max packet size */ 108 if (nb_packets > 0) 109 packet_avg_size = packet_total_size / nb_packets; 110 else 111 packet_avg_size = 0; 112 avio_wb32(s, packet_avg_size); /* avg packet size */ 113 avio_wb32(s, nb_packets); /* num packets */ 114 avio_wb32(s, duration); /* duration */ 115 avio_wb32(s, BUFFER_DURATION); /* preroll */ 116 avio_wb32(s, index_pos); /* index offset */ 117 /* computation of data the data offset */ 118 data_offset_ptr = s->buf_ptr; 119 avio_wb32(s, 0); /* data offset : will be patched after */ 120 avio_wb16(s, ctx->nb_streams); /* num streams */ 121 flags = 1 | 2; /* save allowed & perfect play */ 122 if (!s->seekable) 123 flags |= 4; /* live broadcast */ 124 avio_wb16(s, flags); 125 126 /* comments */ 127 128 ffio_wfourcc(s,"CONT"); 129 size = 4 * 2 + 10; 130 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 131 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 132 if(tag) size += strlen(tag->value); 133 } 134 avio_wb32(s,size); 135 avio_wb16(s,0); 136 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 137 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 138 put_str(s, tag ? tag->value : ""); 139 } 140 141 for(i=0;i<ctx->nb_streams;i++) { 142 int codec_data_size; 143 144 stream = &rm->streams[i]; 145 146 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { 147 desc = "The Audio Stream"; 148 mimetype = "audio/x-pn-realaudio"; 149 codec_data_size = 73; 150 } else { 151 desc = "The Video Stream"; 152 mimetype = "video/x-pn-realvideo"; 153 codec_data_size = 34; 154 } 155 156 ffio_wfourcc(s,"MDPR"); 157 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size; 158 avio_wb32(s, size); 159 avio_wb16(s, 0); 160 161 avio_wb16(s, i); /* stream number */ 162 avio_wb32(s, stream->bit_rate); /* max bit rate */ 163 avio_wb32(s, stream->bit_rate); /* avg bit rate */ 164 avio_wb32(s, stream->packet_max_size); /* max packet size */ 165 if (stream->nb_packets > 0) 166 packet_avg_size = stream->packet_total_size / 167 stream->nb_packets; 168 else 169 packet_avg_size = 0; 170 avio_wb32(s, packet_avg_size); /* avg packet size */ 171 avio_wb32(s, 0); /* start time */ 172 avio_wb32(s, BUFFER_DURATION); /* preroll */ 173 /* duration */ 174 if (!s->seekable || !stream->total_frames) 175 avio_wb32(s, (int)(3600 * 1000)); 176 else 177 avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate)); 178 put_str8(s, desc); 179 put_str8(s, mimetype); 180 avio_wb32(s, codec_data_size); 181 182 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { 183 int coded_frame_size, fscode, sample_rate; 184 sample_rate = stream->enc->sample_rate; 185 coded_frame_size = (stream->enc->bit_rate * 186 stream->enc->frame_size) / (8 * sample_rate); 187 /* audio codec info */ 188 avio_write(s, ".ra", 3); 189 avio_w8(s, 0xfd); 190 avio_wb32(s, 0x00040000); /* version */ 191 ffio_wfourcc(s, ".ra4"); 192 avio_wb32(s, 0x01b53530); /* stream length */ 193 avio_wb16(s, 4); /* unknown */ 194 avio_wb32(s, 0x39); /* header size */ 195 196 switch(sample_rate) { 197 case 48000: 198 case 24000: 199 case 12000: 200 fscode = 1; 201 break; 202 default: 203 case 44100: 204 case 22050: 205 case 11025: 206 fscode = 2; 207 break; 208 case 32000: 209 case 16000: 210 case 8000: 211 fscode = 3; 212 } 213 avio_wb16(s, fscode); /* codec additional info, for AC-3, seems 214 to be a frequency code */ 215 /* special hack to compensate rounding errors... */ 216 if (coded_frame_size == 557) 217 coded_frame_size--; 218 avio_wb32(s, coded_frame_size); /* frame length */ 219 avio_wb32(s, 0x51540); /* unknown */ 220 avio_wb32(s, 0x249f0); /* unknown */ 221 avio_wb32(s, 0x249f0); /* unknown */ 222 avio_wb16(s, 0x01); 223 /* frame length : seems to be very important */ 224 avio_wb16(s, coded_frame_size); 225 avio_wb32(s, 0); /* unknown */ 226 avio_wb16(s, stream->enc->sample_rate); /* sample rate */ 227 avio_wb32(s, 0x10); /* unknown */ 228 avio_wb16(s, stream->enc->channels); 229 put_str8(s, "Int0"); /* codec name */ 230 if (stream->enc->codec_tag) { 231 avio_w8(s, 4); /* tag length */ 232 avio_wl32(s, stream->enc->codec_tag); 233 } else { 234 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n"); 235 return -1; 236 } 237 avio_wb16(s, 0); /* title length */ 238 avio_wb16(s, 0); /* author length */ 239 avio_wb16(s, 0); /* copyright length */ 240 avio_w8(s, 0); /* end of header */ 241 } else { 242 /* video codec info */ 243 avio_wb32(s,34); /* size */ 244 ffio_wfourcc(s, "VIDO"); 245 if(stream->enc->codec_id == CODEC_ID_RV10) 246 ffio_wfourcc(s,"RV10"); 247 else 248 ffio_wfourcc(s,"RV20"); 249 avio_wb16(s, stream->enc->width); 250 avio_wb16(s, stream->enc->height); 251 avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */ 252 avio_wb32(s,0); /* unknown meaning */ 253 avio_wb16(s, (int) stream->frame_rate); /* unknown meaning */ 254 avio_wb32(s,0); /* unknown meaning */ 255 avio_wb16(s, 8); /* unknown meaning */ 256 /* Seems to be the codec version: only use basic H263. The next 257 versions seems to add a diffential DC coding as in 258 MPEG... nothing new under the sun */ 259 if(stream->enc->codec_id == CODEC_ID_RV10) 260 avio_wb32(s,0x10000000); 261 else 262 avio_wb32(s,0x20103001); 263 //avio_wb32(s,0x10003000); 264 } 265 } 266 267 /* patch data offset field */ 268 data_pos = s->buf_ptr - start_ptr; 269 rm->data_pos = data_pos; 270 data_offset_ptr[0] = data_pos >> 24; 271 data_offset_ptr[1] = data_pos >> 16; 272 data_offset_ptr[2] = data_pos >> 8; 273 data_offset_ptr[3] = data_pos; 274 275 /* data stream */ 276 ffio_wfourcc(s, "DATA"); 277 avio_wb32(s,data_size + 10 + 8); 278 avio_wb16(s,0); 279 280 avio_wb32(s, nb_packets); /* number of packets */ 281 avio_wb32(s,0); /* next data header */ 282 return 0; 283} 284 285static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, 286 int length, int key_frame) 287{ 288 int timestamp; 289 AVIOContext *s = ctx->pb; 290 291 stream->nb_packets++; 292 stream->packet_total_size += length; 293 if (length > stream->packet_max_size) 294 stream->packet_max_size = length; 295 296 avio_wb16(s,0); /* version */ 297 avio_wb16(s,length + 12); 298 avio_wb16(s, stream->num); /* stream number */ 299 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate; 300 avio_wb32(s, timestamp); /* timestamp */ 301 avio_w8(s, 0); /* reserved */ 302 avio_w8(s, key_frame ? 2 : 0); /* flags */ 303} 304 305static int rm_write_header(AVFormatContext *s) 306{ 307 RMMuxContext *rm = s->priv_data; 308 StreamInfo *stream; 309 int n; 310 AVCodecContext *codec; 311 312 for(n=0;n<s->nb_streams;n++) { 313 s->streams[n]->id = n; 314 codec = s->streams[n]->codec; 315 stream = &rm->streams[n]; 316 memset(stream, 0, sizeof(StreamInfo)); 317 stream->num = n; 318 stream->bit_rate = codec->bit_rate; 319 stream->enc = codec; 320 321 switch(codec->codec_type) { 322 case AVMEDIA_TYPE_AUDIO: 323 rm->audio_stream = stream; 324 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size; 325 /* XXX: dummy values */ 326 stream->packet_max_size = 1024; 327 stream->nb_packets = 0; 328 stream->total_frames = stream->nb_packets; 329 break; 330 case AVMEDIA_TYPE_VIDEO: 331 rm->video_stream = stream; 332 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num; 333 /* XXX: dummy values */ 334 stream->packet_max_size = 4096; 335 stream->nb_packets = 0; 336 stream->total_frames = stream->nb_packets; 337 break; 338 default: 339 return -1; 340 } 341 } 342 343 if (rv10_write_header(s, 0, 0)) 344 return AVERROR_INVALIDDATA; 345 avio_flush(s->pb); 346 return 0; 347} 348 349static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags) 350{ 351 uint8_t *buf1; 352 RMMuxContext *rm = s->priv_data; 353 AVIOContext *pb = s->pb; 354 StreamInfo *stream = rm->audio_stream; 355 int i; 356 357 /* XXX: suppress this malloc */ 358 buf1 = av_malloc(size * sizeof(uint8_t)); 359 360 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY)); 361 362 if (stream->enc->codec_id == CODEC_ID_AC3) { 363 /* for AC-3, the words seem to be reversed */ 364 for(i=0;i<size;i+=2) { 365 buf1[i] = buf[i+1]; 366 buf1[i+1] = buf[i]; 367 } 368 avio_write(pb, buf1, size); 369 } else { 370 avio_write(pb, buf, size); 371 } 372 avio_flush(pb); 373 stream->nb_frames++; 374 av_free(buf1); 375 return 0; 376} 377 378static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags) 379{ 380 RMMuxContext *rm = s->priv_data; 381 AVIOContext *pb = s->pb; 382 StreamInfo *stream = rm->video_stream; 383 int key_frame = !!(flags & AV_PKT_FLAG_KEY); 384 385 /* XXX: this is incorrect: should be a parameter */ 386 387 /* Well, I spent some time finding the meaning of these bits. I am 388 not sure I understood everything, but it works !! */ 389#if 1 390 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame); 391 /* bit 7: '1' if final packet of a frame converted in several packets */ 392 avio_w8(pb, 0x81); 393 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current 394 frame starting from 1 */ 395 if (key_frame) { 396 avio_w8(pb, 0x81); 397 } else { 398 avio_w8(pb, 0x01); 399 } 400 if(size >= 0x4000){ 401 avio_wb32(pb, size); /* total frame size */ 402 avio_wb32(pb, size); /* offset from the start or the end */ 403 }else{ 404 avio_wb16(pb, 0x4000 | size); /* total frame size */ 405 avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */ 406 } 407#else 408 /* full frame */ 409 write_packet_header(s, size + 6); 410 avio_w8(pb, 0xc0); 411 avio_wb16(pb, 0x4000 + size); /* total frame size */ 412 avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */ 413#endif 414 avio_w8(pb, stream->nb_frames & 0xff); 415 416 avio_write(pb, buf, size); 417 avio_flush(pb); 418 419 stream->nb_frames++; 420 return 0; 421} 422 423static int rm_write_packet(AVFormatContext *s, AVPacket *pkt) 424{ 425 if (s->streams[pkt->stream_index]->codec->codec_type == 426 AVMEDIA_TYPE_AUDIO) 427 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags); 428 else 429 return rm_write_video(s, pkt->data, pkt->size, pkt->flags); 430} 431 432static int rm_write_trailer(AVFormatContext *s) 433{ 434 RMMuxContext *rm = s->priv_data; 435 int data_size, index_pos, i; 436 AVIOContext *pb = s->pb; 437 438 if (s->pb->seekable) { 439 /* end of file: finish to write header */ 440 index_pos = avio_tell(pb); 441 data_size = index_pos - rm->data_pos; 442 443 /* FIXME: write index */ 444 445 /* undocumented end header */ 446 avio_wb32(pb, 0); 447 avio_wb32(pb, 0); 448 449 avio_seek(pb, 0, SEEK_SET); 450 for(i=0;i<s->nb_streams;i++) 451 rm->streams[i].total_frames = rm->streams[i].nb_frames; 452 rv10_write_header(s, data_size, 0); 453 } else { 454 /* undocumented end header */ 455 avio_wb32(pb, 0); 456 avio_wb32(pb, 0); 457 } 458 avio_flush(pb); 459 return 0; 460} 461 462 463AVOutputFormat ff_rm_muxer = { 464 .name = "rm", 465 .long_name = NULL_IF_CONFIG_SMALL("RealMedia format"), 466 .mime_type = "application/vnd.rn-realmedia", 467 .extensions = "rm,ra", 468 .priv_data_size = sizeof(RMMuxContext), 469 .audio_codec = CODEC_ID_AC3, 470 .video_codec = CODEC_ID_RV10, 471 .write_header = rm_write_header, 472 .write_packet = rm_write_packet, 473 .write_trailer = rm_write_trailer, 474 .codec_tag= (const AVCodecTag* const []){ff_rm_codec_tags, 0}, 475}; 476