1/* 2 * Flash Compatible Streaming Format muxer 3 * Copyright (c) 2000 Fabrice Bellard 4 * Copyright (c) 2003 Tinic Uro 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "libavcodec/put_bits.h" 24#include "libavutil/avassert.h" 25#include "avformat.h" 26#include "swf.h" 27 28static void put_swf_tag(AVFormatContext *s, int tag) 29{ 30 SWFContext *swf = s->priv_data; 31 AVIOContext *pb = s->pb; 32 33 swf->tag_pos = avio_tell(pb); 34 swf->tag = tag; 35 /* reserve some room for the tag */ 36 if (tag & TAG_LONG) { 37 avio_wl16(pb, 0); 38 avio_wl32(pb, 0); 39 } else { 40 avio_wl16(pb, 0); 41 } 42} 43 44static void put_swf_end_tag(AVFormatContext *s) 45{ 46 SWFContext *swf = s->priv_data; 47 AVIOContext *pb = s->pb; 48 int64_t pos; 49 int tag_len, tag; 50 51 pos = avio_tell(pb); 52 tag_len = pos - swf->tag_pos - 2; 53 tag = swf->tag; 54 avio_seek(pb, swf->tag_pos, SEEK_SET); 55 if (tag & TAG_LONG) { 56 tag &= ~TAG_LONG; 57 avio_wl16(pb, (tag << 6) | 0x3f); 58 avio_wl32(pb, tag_len - 4); 59 } else { 60 av_assert0(tag_len < 0x3f); 61 avio_wl16(pb, (tag << 6) | tag_len); 62 } 63 avio_seek(pb, pos, SEEK_SET); 64} 65 66static inline void max_nbits(int *nbits_ptr, int val) 67{ 68 int n; 69 70 if (val == 0) 71 return; 72 val = abs(val); 73 n = 1; 74 while (val != 0) { 75 n++; 76 val >>= 1; 77 } 78 if (n > *nbits_ptr) 79 *nbits_ptr = n; 80} 81 82static void put_swf_rect(AVIOContext *pb, 83 int xmin, int xmax, int ymin, int ymax) 84{ 85 PutBitContext p; 86 uint8_t buf[256]; 87 int nbits, mask; 88 89 init_put_bits(&p, buf, sizeof(buf)); 90 91 nbits = 0; 92 max_nbits(&nbits, xmin); 93 max_nbits(&nbits, xmax); 94 max_nbits(&nbits, ymin); 95 max_nbits(&nbits, ymax); 96 mask = (1 << nbits) - 1; 97 98 /* rectangle info */ 99 put_bits(&p, 5, nbits); 100 put_bits(&p, nbits, xmin & mask); 101 put_bits(&p, nbits, xmax & mask); 102 put_bits(&p, nbits, ymin & mask); 103 put_bits(&p, nbits, ymax & mask); 104 105 flush_put_bits(&p); 106 avio_write(pb, buf, put_bits_ptr(&p) - p.buf); 107} 108 109static void put_swf_line_edge(PutBitContext *pb, int dx, int dy) 110{ 111 int nbits, mask; 112 113 put_bits(pb, 1, 1); /* edge */ 114 put_bits(pb, 1, 1); /* line select */ 115 nbits = 2; 116 max_nbits(&nbits, dx); 117 max_nbits(&nbits, dy); 118 119 mask = (1 << nbits) - 1; 120 put_bits(pb, 4, nbits - 2); /* 16 bits precision */ 121 if (dx == 0) { 122 put_bits(pb, 1, 0); 123 put_bits(pb, 1, 1); 124 put_bits(pb, nbits, dy & mask); 125 } else if (dy == 0) { 126 put_bits(pb, 1, 0); 127 put_bits(pb, 1, 0); 128 put_bits(pb, nbits, dx & mask); 129 } else { 130 put_bits(pb, 1, 1); 131 put_bits(pb, nbits, dx & mask); 132 put_bits(pb, nbits, dy & mask); 133 } 134} 135 136#define FRAC_BITS 16 137 138static void put_swf_matrix(AVIOContext *pb, 139 int a, int b, int c, int d, int tx, int ty) 140{ 141 PutBitContext p; 142 uint8_t buf[256]; 143 int nbits; 144 145 init_put_bits(&p, buf, sizeof(buf)); 146 147 put_bits(&p, 1, 1); /* a, d present */ 148 nbits = 1; 149 max_nbits(&nbits, a); 150 max_nbits(&nbits, d); 151 put_bits(&p, 5, nbits); /* nb bits */ 152 put_bits(&p, nbits, a); 153 put_bits(&p, nbits, d); 154 155 put_bits(&p, 1, 1); /* b, c present */ 156 nbits = 1; 157 max_nbits(&nbits, c); 158 max_nbits(&nbits, b); 159 put_bits(&p, 5, nbits); /* nb bits */ 160 put_bits(&p, nbits, c); 161 put_bits(&p, nbits, b); 162 163 nbits = 1; 164 max_nbits(&nbits, tx); 165 max_nbits(&nbits, ty); 166 put_bits(&p, 5, nbits); /* nb bits */ 167 put_bits(&p, nbits, tx); 168 put_bits(&p, nbits, ty); 169 170 flush_put_bits(&p); 171 avio_write(pb, buf, put_bits_ptr(&p) - p.buf); 172} 173 174static int swf_write_header(AVFormatContext *s) 175{ 176 SWFContext *swf = s->priv_data; 177 AVIOContext *pb = s->pb; 178 PutBitContext p; 179 uint8_t buf1[256]; 180 int i, width, height, rate, rate_base; 181 int version; 182 183 swf->sound_samples = 0; 184 swf->swf_frame_number = 0; 185 swf->video_frame_number = 0; 186 187 for(i=0;i<s->nb_streams;i++) { 188 AVCodecContext *enc = s->streams[i]->codec; 189 if (enc->codec_type == AVMEDIA_TYPE_AUDIO) { 190 if (swf->audio_enc) { 191 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n"); 192 return AVERROR_INVALIDDATA; 193 } 194 if (enc->codec_id == AV_CODEC_ID_MP3) { 195 if (!enc->frame_size) { 196 av_log(s, AV_LOG_ERROR, "audio frame size not set\n"); 197 return -1; 198 } 199 swf->audio_enc = enc; 200 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE); 201 if (!swf->audio_fifo) 202 return AVERROR(ENOMEM); 203 } else { 204 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n"); 205 return -1; 206 } 207 } else { 208 if (swf->video_enc) { 209 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n"); 210 return AVERROR_INVALIDDATA; 211 } 212 if (enc->codec_id == AV_CODEC_ID_VP6F || 213 enc->codec_id == AV_CODEC_ID_FLV1 || 214 enc->codec_id == AV_CODEC_ID_MJPEG) { 215 swf->video_st = s->streams[i]; 216 swf->video_enc = enc; 217 } else { 218 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n"); 219 return -1; 220 } 221 } 222 } 223 224 if (!swf->video_enc) { 225 /* currently, cannot work correctly if audio only */ 226 width = 320; 227 height = 200; 228 rate = 10; 229 rate_base= 1; 230 } else { 231 width = swf->video_enc->width; 232 height = swf->video_enc->height; 233 // TODO: should be avg_frame_rate 234 rate = swf->video_st->time_base.den; 235 rate_base = swf->video_st->time_base.num; 236 } 237 238 if (!swf->audio_enc) 239 swf->samples_per_frame = (44100.0 * rate_base) / rate; 240 else 241 swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate; 242 243 avio_write(pb, "FWS", 3); 244 245 if (!strcmp("avm2", s->oformat->name)) 246 version = 9; 247 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F) 248 version = 8; /* version 8 and above support VP6 codec */ 249 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1) 250 version = 6; /* version 6 and above support FLV1 codec */ 251 else 252 version = 4; /* version 4 for mpeg audio support */ 253 avio_w8(pb, version); 254 255 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size 256 (will be patched if not streamed) */ 257 258 put_swf_rect(pb, 0, width * 20, 0, height * 20); 259 avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */ 260 swf->duration_pos = avio_tell(pb); 261 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */ 262 263 /* avm2/swf v9 (also v8?) files require a file attribute tag */ 264 if (version == 9) { 265 put_swf_tag(s, TAG_FILEATTRIBUTES); 266 avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */ 267 put_swf_end_tag(s); 268 } 269 270 /* define a shape with the jpeg inside */ 271 if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) { 272 put_swf_tag(s, TAG_DEFINESHAPE); 273 274 avio_wl16(pb, SHAPE_ID); /* ID of shape */ 275 /* bounding rectangle */ 276 put_swf_rect(pb, 0, width, 0, height); 277 /* style info */ 278 avio_w8(pb, 1); /* one fill style */ 279 avio_w8(pb, 0x41); /* clipped bitmap fill */ 280 avio_wl16(pb, BITMAP_ID); /* bitmap ID */ 281 /* position of the bitmap */ 282 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0, 283 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0); 284 avio_w8(pb, 0); /* no line style */ 285 286 /* shape drawing */ 287 init_put_bits(&p, buf1, sizeof(buf1)); 288 put_bits(&p, 4, 1); /* one fill bit */ 289 put_bits(&p, 4, 0); /* zero line bit */ 290 291 put_bits(&p, 1, 0); /* not an edge */ 292 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0); 293 put_bits(&p, 5, 1); /* nbits */ 294 put_bits(&p, 1, 0); /* X */ 295 put_bits(&p, 1, 0); /* Y */ 296 put_bits(&p, 1, 1); /* set fill style 1 */ 297 298 /* draw the rectangle ! */ 299 put_swf_line_edge(&p, width, 0); 300 put_swf_line_edge(&p, 0, height); 301 put_swf_line_edge(&p, -width, 0); 302 put_swf_line_edge(&p, 0, -height); 303 304 /* end of shape */ 305 put_bits(&p, 1, 0); /* not an edge */ 306 put_bits(&p, 5, 0); 307 308 flush_put_bits(&p); 309 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf); 310 311 put_swf_end_tag(s); 312 } 313 314 if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) { 315 int v = 0; 316 317 /* start sound */ 318 put_swf_tag(s, TAG_STREAMHEAD2); 319 switch(swf->audio_enc->sample_rate) { 320 case 11025: v |= 1 << 2; break; 321 case 22050: v |= 2 << 2; break; 322 case 44100: v |= 3 << 2; break; 323 default: 324 /* not supported */ 325 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n"); 326 return -1; 327 } 328 v |= 0x02; /* 16 bit playback */ 329 if (swf->audio_enc->channels == 2) 330 v |= 0x01; /* stereo playback */ 331 avio_w8(s->pb, v); 332 v |= 0x20; /* mp3 compressed */ 333 avio_w8(s->pb, v); 334 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */ 335 avio_wl16(s->pb, 0); 336 337 put_swf_end_tag(s); 338 } 339 340 avio_flush(s->pb); 341 return 0; 342} 343 344static int swf_write_video(AVFormatContext *s, 345 AVCodecContext *enc, const uint8_t *buf, int size) 346{ 347 SWFContext *swf = s->priv_data; 348 AVIOContext *pb = s->pb; 349 350 /* Flash Player limit */ 351 if (swf->swf_frame_number == 16000) 352 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); 353 354 if (enc->codec_id == AV_CODEC_ID_VP6F || 355 enc->codec_id == AV_CODEC_ID_FLV1) { 356 if (swf->video_frame_number == 0) { 357 /* create a new video object */ 358 put_swf_tag(s, TAG_VIDEOSTREAM); 359 avio_wl16(pb, VIDEO_ID); 360 swf->vframes_pos = avio_tell(pb); 361 avio_wl16(pb, 15000); /* hard flash player limit */ 362 avio_wl16(pb, enc->width); 363 avio_wl16(pb, enc->height); 364 avio_w8(pb, 0); 365 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id)); 366 put_swf_end_tag(s); 367 368 /* place the video object for the first time */ 369 put_swf_tag(s, TAG_PLACEOBJECT2); 370 avio_w8(pb, 0x36); 371 avio_wl16(pb, 1); 372 avio_wl16(pb, VIDEO_ID); 373 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0); 374 avio_wl16(pb, swf->video_frame_number); 375 avio_write(pb, "video", 5); 376 avio_w8(pb, 0x00); 377 put_swf_end_tag(s); 378 } else { 379 /* mark the character for update */ 380 put_swf_tag(s, TAG_PLACEOBJECT2); 381 avio_w8(pb, 0x11); 382 avio_wl16(pb, 1); 383 avio_wl16(pb, swf->video_frame_number); 384 put_swf_end_tag(s); 385 } 386 387 /* set video frame data */ 388 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG); 389 avio_wl16(pb, VIDEO_ID); 390 avio_wl16(pb, swf->video_frame_number++); 391 avio_write(pb, buf, size); 392 put_swf_end_tag(s); 393 } else if (enc->codec_id == AV_CODEC_ID_MJPEG) { 394 if (swf->swf_frame_number > 0) { 395 /* remove the shape */ 396 put_swf_tag(s, TAG_REMOVEOBJECT); 397 avio_wl16(pb, SHAPE_ID); /* shape ID */ 398 avio_wl16(pb, 1); /* depth */ 399 put_swf_end_tag(s); 400 401 /* free the bitmap */ 402 put_swf_tag(s, TAG_FREECHARACTER); 403 avio_wl16(pb, BITMAP_ID); 404 put_swf_end_tag(s); 405 } 406 407 put_swf_tag(s, TAG_JPEG2 | TAG_LONG); 408 409 avio_wl16(pb, BITMAP_ID); /* ID of the image */ 410 411 /* a dummy jpeg header seems to be required */ 412 avio_wb32(pb, 0xffd8ffd9); 413 /* write the jpeg image */ 414 avio_write(pb, buf, size); 415 416 put_swf_end_tag(s); 417 418 /* draw the shape */ 419 420 put_swf_tag(s, TAG_PLACEOBJECT); 421 avio_wl16(pb, SHAPE_ID); /* shape ID */ 422 avio_wl16(pb, 1); /* depth */ 423 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0); 424 put_swf_end_tag(s); 425 } 426 427 swf->swf_frame_number++; 428 429 /* streaming sound always should be placed just before showframe tags */ 430 if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) { 431 int frame_size = av_fifo_size(swf->audio_fifo); 432 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); 433 avio_wl16(pb, swf->sound_samples); 434 avio_wl16(pb, 0); // seek samples 435 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write); 436 put_swf_end_tag(s); 437 438 /* update FIFO */ 439 swf->sound_samples = 0; 440 } 441 442 /* output the frame */ 443 put_swf_tag(s, TAG_SHOWFRAME); 444 put_swf_end_tag(s); 445 446 return 0; 447} 448 449static int swf_write_audio(AVFormatContext *s, 450 AVCodecContext *enc, uint8_t *buf, int size) 451{ 452 SWFContext *swf = s->priv_data; 453 454 /* Flash Player limit */ 455 if (swf->swf_frame_number == 16000) 456 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); 457 458 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) { 459 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n"); 460 return -1; 461 } 462 463 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL); 464 swf->sound_samples += enc->frame_size; 465 466 /* if audio only stream make sure we add swf frames */ 467 if (!swf->video_enc) 468 swf_write_video(s, enc, 0, 0); 469 470 return 0; 471} 472 473static int swf_write_packet(AVFormatContext *s, AVPacket *pkt) 474{ 475 AVCodecContext *codec = s->streams[pkt->stream_index]->codec; 476 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) 477 return swf_write_audio(s, codec, pkt->data, pkt->size); 478 else 479 return swf_write_video(s, codec, pkt->data, pkt->size); 480} 481 482static int swf_write_trailer(AVFormatContext *s) 483{ 484 SWFContext *swf = s->priv_data; 485 AVIOContext *pb = s->pb; 486 AVCodecContext *enc, *video_enc; 487 int file_size, i; 488 489 video_enc = NULL; 490 for(i=0;i<s->nb_streams;i++) { 491 enc = s->streams[i]->codec; 492 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) 493 video_enc = enc; 494 else { 495 av_fifo_freep(&swf->audio_fifo); 496 } 497 } 498 499 put_swf_tag(s, TAG_END); 500 put_swf_end_tag(s); 501 502 /* patch file size and number of frames if not streamed */ 503 if (s->pb->seekable && video_enc) { 504 file_size = avio_tell(pb); 505 avio_seek(pb, 4, SEEK_SET); 506 avio_wl32(pb, file_size); 507 avio_seek(pb, swf->duration_pos, SEEK_SET); 508 avio_wl16(pb, swf->video_frame_number); 509 if (swf->vframes_pos) { 510 avio_seek(pb, swf->vframes_pos, SEEK_SET); 511 avio_wl16(pb, swf->video_frame_number); 512 } 513 avio_seek(pb, file_size, SEEK_SET); 514 } 515 return 0; 516} 517 518#if CONFIG_SWF_MUXER 519AVOutputFormat ff_swf_muxer = { 520 .name = "swf", 521 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), 522 .mime_type = "application/x-shockwave-flash", 523 .extensions = "swf", 524 .priv_data_size = sizeof(SWFContext), 525 .audio_codec = AV_CODEC_ID_MP3, 526 .video_codec = AV_CODEC_ID_FLV1, 527 .write_header = swf_write_header, 528 .write_packet = swf_write_packet, 529 .write_trailer = swf_write_trailer, 530 .flags = AVFMT_TS_NONSTRICT, 531}; 532#endif 533#if CONFIG_AVM2_MUXER 534AVOutputFormat ff_avm2_muxer = { 535 .name = "avm2", 536 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"), 537 .mime_type = "application/x-shockwave-flash", 538 .priv_data_size = sizeof(SWFContext), 539 .audio_codec = AV_CODEC_ID_MP3, 540 .video_codec = AV_CODEC_ID_FLV1, 541 .write_header = swf_write_header, 542 .write_packet = swf_write_packet, 543 .write_trailer = swf_write_trailer, 544 .flags = AVFMT_TS_NONSTRICT, 545}; 546#endif 547