1/* 2 * "Real" compatible muxer. 3 * Copyright (c) 2000, 2001 Fabrice Bellard 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#include "avformat.h" 22#include "rm.h" 23 24typedef struct { 25 int nb_packets; 26 int packet_total_size; 27 int packet_max_size; 28 /* codec related output */ 29 int bit_rate; 30 float frame_rate; 31 int nb_frames; /* current frame number */ 32 int total_frames; /* total number of frames */ 33 int num; 34 AVCodecContext *enc; 35} StreamInfo; 36 37typedef struct { 38 StreamInfo streams[2]; 39 StreamInfo *audio_stream, *video_stream; 40 int data_pos; /* position of the data after the header */ 41} RMMuxContext; 42 43/* in ms */ 44#define BUFFER_DURATION 0 45 46 47static void put_str(ByteIOContext *s, const char *tag) 48{ 49 put_be16(s,strlen(tag)); 50 while (*tag) { 51 put_byte(s, *tag++); 52 } 53} 54 55static void put_str8(ByteIOContext *s, const char *tag) 56{ 57 put_byte(s, strlen(tag)); 58 while (*tag) { 59 put_byte(s, *tag++); 60 } 61} 62 63static void rv10_write_header(AVFormatContext *ctx, 64 int data_size, int index_pos) 65{ 66 RMMuxContext *rm = ctx->priv_data; 67 ByteIOContext *s = ctx->pb; 68 StreamInfo *stream; 69 unsigned char *data_offset_ptr, *start_ptr; 70 const char *desc, *mimetype; 71 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i; 72 int bit_rate, v, duration, flags, data_pos; 73 AVMetadataTag *tag; 74 75 start_ptr = s->buf_ptr; 76 77 put_tag(s, ".RMF"); 78 put_be32(s,18); /* header size */ 79 put_be16(s,0); 80 put_be32(s,0); 81 put_be32(s,4 + ctx->nb_streams); /* num headers */ 82 83 put_tag(s,"PROP"); 84 put_be32(s, 50); 85 put_be16(s, 0); 86 packet_max_size = 0; 87 packet_total_size = 0; 88 nb_packets = 0; 89 bit_rate = 0; 90 duration = 0; 91 for(i=0;i<ctx->nb_streams;i++) { 92 StreamInfo *stream = &rm->streams[i]; 93 bit_rate += stream->bit_rate; 94 if (stream->packet_max_size > packet_max_size) 95 packet_max_size = stream->packet_max_size; 96 nb_packets += stream->nb_packets; 97 packet_total_size += stream->packet_total_size; 98 /* select maximum duration */ 99 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate); 100 if (v > duration) 101 duration = v; 102 } 103 put_be32(s, bit_rate); /* max bit rate */ 104 put_be32(s, bit_rate); /* avg bit rate */ 105 put_be32(s, packet_max_size); /* max packet size */ 106 if (nb_packets > 0) 107 packet_avg_size = packet_total_size / nb_packets; 108 else 109 packet_avg_size = 0; 110 put_be32(s, packet_avg_size); /* avg packet size */ 111 put_be32(s, nb_packets); /* num packets */ 112 put_be32(s, duration); /* duration */ 113 put_be32(s, BUFFER_DURATION); /* preroll */ 114 put_be32(s, index_pos); /* index offset */ 115 /* computation of data the data offset */ 116 data_offset_ptr = s->buf_ptr; 117 put_be32(s, 0); /* data offset : will be patched after */ 118 put_be16(s, ctx->nb_streams); /* num streams */ 119 flags = 1 | 2; /* save allowed & perfect play */ 120 if (url_is_streamed(s)) 121 flags |= 4; /* live broadcast */ 122 put_be16(s, flags); 123 124 /* comments */ 125 126 put_tag(s,"CONT"); 127 size = 4 * 2 + 10; 128 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 129 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 130 if(tag) size += strlen(tag->value); 131 } 132 put_be32(s,size); 133 put_be16(s,0); 134 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 135 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 136 put_str(s, tag ? tag->value : ""); 137 } 138 139 for(i=0;i<ctx->nb_streams;i++) { 140 int codec_data_size; 141 142 stream = &rm->streams[i]; 143 144 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) { 145 desc = "The Audio Stream"; 146 mimetype = "audio/x-pn-realaudio"; 147 codec_data_size = 73; 148 } else { 149 desc = "The Video Stream"; 150 mimetype = "video/x-pn-realvideo"; 151 codec_data_size = 34; 152 } 153 154 put_tag(s,"MDPR"); 155 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size; 156 put_be32(s, size); 157 put_be16(s, 0); 158 159 put_be16(s, i); /* stream number */ 160 put_be32(s, stream->bit_rate); /* max bit rate */ 161 put_be32(s, stream->bit_rate); /* avg bit rate */ 162 put_be32(s, stream->packet_max_size); /* max packet size */ 163 if (stream->nb_packets > 0) 164 packet_avg_size = stream->packet_total_size / 165 stream->nb_packets; 166 else 167 packet_avg_size = 0; 168 put_be32(s, packet_avg_size); /* avg packet size */ 169 put_be32(s, 0); /* start time */ 170 put_be32(s, BUFFER_DURATION); /* preroll */ 171 /* duration */ 172 if (url_is_streamed(s) || !stream->total_frames) 173 put_be32(s, (int)(3600 * 1000)); 174 else 175 put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate)); 176 put_str8(s, desc); 177 put_str8(s, mimetype); 178 put_be32(s, codec_data_size); 179 180 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) { 181 int coded_frame_size, fscode, sample_rate; 182 sample_rate = stream->enc->sample_rate; 183 coded_frame_size = (stream->enc->bit_rate * 184 stream->enc->frame_size) / (8 * sample_rate); 185 /* audio codec info */ 186 put_tag(s, ".ra"); 187 put_byte(s, 0xfd); 188 put_be32(s, 0x00040000); /* version */ 189 put_tag(s, ".ra4"); 190 put_be32(s, 0x01b53530); /* stream length */ 191 put_be16(s, 4); /* unknown */ 192 put_be32(s, 0x39); /* header size */ 193 194 switch(sample_rate) { 195 case 48000: 196 case 24000: 197 case 12000: 198 fscode = 1; 199 break; 200 default: 201 case 44100: 202 case 22050: 203 case 11025: 204 fscode = 2; 205 break; 206 case 32000: 207 case 16000: 208 case 8000: 209 fscode = 3; 210 } 211 put_be16(s, fscode); /* codec additional info, for AC-3, seems 212 to be a frequency code */ 213 /* special hack to compensate rounding errors... */ 214 if (coded_frame_size == 557) 215 coded_frame_size--; 216 put_be32(s, coded_frame_size); /* frame length */ 217 put_be32(s, 0x51540); /* unknown */ 218 put_be32(s, 0x249f0); /* unknown */ 219 put_be32(s, 0x249f0); /* unknown */ 220 put_be16(s, 0x01); 221 /* frame length : seems to be very important */ 222 put_be16(s, coded_frame_size); 223 put_be32(s, 0); /* unknown */ 224 put_be16(s, stream->enc->sample_rate); /* sample rate */ 225 put_be32(s, 0x10); /* unknown */ 226 put_be16(s, stream->enc->channels); 227 put_str8(s, "Int0"); /* codec name */ 228 put_str8(s, "dnet"); /* codec name */ 229 put_be16(s, 0); /* title length */ 230 put_be16(s, 0); /* author length */ 231 put_be16(s, 0); /* copyright length */ 232 put_byte(s, 0); /* end of header */ 233 } else { 234 /* video codec info */ 235 put_be32(s,34); /* size */ 236 if(stream->enc->codec_id == CODEC_ID_RV10) 237 put_tag(s,"VIDORV10"); 238 else 239 put_tag(s,"VIDORV20"); 240 put_be16(s, stream->enc->width); 241 put_be16(s, stream->enc->height); 242 put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */ 243 put_be32(s,0); /* unknown meaning */ 244 put_be16(s, (int) stream->frame_rate); /* unknown meaning */ 245 put_be32(s,0); /* unknown meaning */ 246 put_be16(s, 8); /* unknown meaning */ 247 /* Seems to be the codec version: only use basic H263. The next 248 versions seems to add a diffential DC coding as in 249 MPEG... nothing new under the sun */ 250 if(stream->enc->codec_id == CODEC_ID_RV10) 251 put_be32(s,0x10000000); 252 else 253 put_be32(s,0x20103001); 254 //put_be32(s,0x10003000); 255 } 256 } 257 258 /* patch data offset field */ 259 data_pos = s->buf_ptr - start_ptr; 260 rm->data_pos = data_pos; 261 data_offset_ptr[0] = data_pos >> 24; 262 data_offset_ptr[1] = data_pos >> 16; 263 data_offset_ptr[2] = data_pos >> 8; 264 data_offset_ptr[3] = data_pos; 265 266 /* data stream */ 267 put_tag(s,"DATA"); 268 put_be32(s,data_size + 10 + 8); 269 put_be16(s,0); 270 271 put_be32(s, nb_packets); /* number of packets */ 272 put_be32(s,0); /* next data header */ 273} 274 275static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, 276 int length, int key_frame) 277{ 278 int timestamp; 279 ByteIOContext *s = ctx->pb; 280 281 stream->nb_packets++; 282 stream->packet_total_size += length; 283 if (length > stream->packet_max_size) 284 stream->packet_max_size = length; 285 286 put_be16(s,0); /* version */ 287 put_be16(s,length + 12); 288 put_be16(s, stream->num); /* stream number */ 289 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate; 290 put_be32(s, timestamp); /* timestamp */ 291 put_byte(s, 0); /* reserved */ 292 put_byte(s, key_frame ? 2 : 0); /* flags */ 293} 294 295static int rm_write_header(AVFormatContext *s) 296{ 297 RMMuxContext *rm = s->priv_data; 298 StreamInfo *stream; 299 int n; 300 AVCodecContext *codec; 301 302 for(n=0;n<s->nb_streams;n++) { 303 s->streams[n]->id = n; 304 codec = s->streams[n]->codec; 305 stream = &rm->streams[n]; 306 memset(stream, 0, sizeof(StreamInfo)); 307 stream->num = n; 308 stream->bit_rate = codec->bit_rate; 309 stream->enc = codec; 310 311 switch(codec->codec_type) { 312 case CODEC_TYPE_AUDIO: 313 rm->audio_stream = stream; 314 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size; 315 /* XXX: dummy values */ 316 stream->packet_max_size = 1024; 317 stream->nb_packets = 0; 318 stream->total_frames = stream->nb_packets; 319 break; 320 case CODEC_TYPE_VIDEO: 321 rm->video_stream = stream; 322 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num; 323 /* XXX: dummy values */ 324 stream->packet_max_size = 4096; 325 stream->nb_packets = 0; 326 stream->total_frames = stream->nb_packets; 327 break; 328 default: 329 return -1; 330 } 331 } 332 333 rv10_write_header(s, 0, 0); 334 put_flush_packet(s->pb); 335 return 0; 336} 337 338static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags) 339{ 340 uint8_t *buf1; 341 RMMuxContext *rm = s->priv_data; 342 ByteIOContext *pb = s->pb; 343 StreamInfo *stream = rm->audio_stream; 344 int i; 345 346 /* XXX: suppress this malloc */ 347 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) ); 348 349 write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY)); 350 351 /* for AC-3, the words seem to be reversed */ 352 for(i=0;i<size;i+=2) { 353 buf1[i] = buf[i+1]; 354 buf1[i+1] = buf[i]; 355 } 356 put_buffer(pb, buf1, size); 357 put_flush_packet(pb); 358 stream->nb_frames++; 359 av_free(buf1); 360 return 0; 361} 362 363static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags) 364{ 365 RMMuxContext *rm = s->priv_data; 366 ByteIOContext *pb = s->pb; 367 StreamInfo *stream = rm->video_stream; 368 int key_frame = !!(flags & PKT_FLAG_KEY); 369 370 /* XXX: this is incorrect: should be a parameter */ 371 372 /* Well, I spent some time finding the meaning of these bits. I am 373 not sure I understood everything, but it works !! */ 374#if 1 375 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame); 376 /* bit 7: '1' if final packet of a frame converted in several packets */ 377 put_byte(pb, 0x81); 378 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current 379 frame starting from 1 */ 380 if (key_frame) { 381 put_byte(pb, 0x81); 382 } else { 383 put_byte(pb, 0x01); 384 } 385 if(size >= 0x4000){ 386 put_be32(pb, size); /* total frame size */ 387 put_be32(pb, size); /* offset from the start or the end */ 388 }else{ 389 put_be16(pb, 0x4000 | size); /* total frame size */ 390 put_be16(pb, 0x4000 | size); /* offset from the start or the end */ 391 } 392#else 393 /* full frame */ 394 write_packet_header(s, size + 6); 395 put_byte(pb, 0xc0); 396 put_be16(pb, 0x4000 + size); /* total frame size */ 397 put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */ 398#endif 399 put_byte(pb, stream->nb_frames & 0xff); 400 401 put_buffer(pb, buf, size); 402 put_flush_packet(pb); 403 404 stream->nb_frames++; 405 return 0; 406} 407 408static int rm_write_packet(AVFormatContext *s, AVPacket *pkt) 409{ 410 if (s->streams[pkt->stream_index]->codec->codec_type == 411 CODEC_TYPE_AUDIO) 412 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags); 413 else 414 return rm_write_video(s, pkt->data, pkt->size, pkt->flags); 415} 416 417static int rm_write_trailer(AVFormatContext *s) 418{ 419 RMMuxContext *rm = s->priv_data; 420 int data_size, index_pos, i; 421 ByteIOContext *pb = s->pb; 422 423 if (!url_is_streamed(s->pb)) { 424 /* end of file: finish to write header */ 425 index_pos = url_fseek(pb, 0, SEEK_CUR); 426 data_size = index_pos - rm->data_pos; 427 428 /* index */ 429 put_tag(pb, "INDX"); 430 put_be32(pb, 10 + 10 * s->nb_streams); 431 put_be16(pb, 0); 432 433 for(i=0;i<s->nb_streams;i++) { 434 put_be32(pb, 0); /* zero indexes */ 435 put_be16(pb, i); /* stream number */ 436 put_be32(pb, 0); /* next index */ 437 } 438 /* undocumented end header */ 439 put_be32(pb, 0); 440 put_be32(pb, 0); 441 442 url_fseek(pb, 0, SEEK_SET); 443 for(i=0;i<s->nb_streams;i++) 444 rm->streams[i].total_frames = rm->streams[i].nb_frames; 445 rv10_write_header(s, data_size, index_pos); 446 } else { 447 /* undocumented end header */ 448 put_be32(pb, 0); 449 put_be32(pb, 0); 450 } 451 put_flush_packet(pb); 452 return 0; 453} 454 455 456AVOutputFormat rm_muxer = { 457 "rm", 458 NULL_IF_CONFIG_SMALL("RealMedia format"), 459 "application/vnd.rn-realmedia", 460 "rm,ra", 461 sizeof(RMMuxContext), 462 CODEC_ID_AC3, 463 CODEC_ID_RV10, 464 rm_write_header, 465 rm_write_packet, 466 rm_write_trailer, 467}; 468