/libavformat/swfenc.c
C | 545 lines | 420 code | 73 blank | 52 comment | 80 complexity | 2fe432c46ada06f665be272d7ed8c1e4 MD5 | raw file
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 = FFABS(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 AVCodecParameters *par = s->streams[i]->codecpar; 189 if (par->codec_type == AVMEDIA_TYPE_AUDIO) { 190 if (swf->audio_par) { 191 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n"); 192 return AVERROR_INVALIDDATA; 193 } 194 if (par->codec_id == AV_CODEC_ID_MP3) { 195 swf->audio_par = par; 196 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE); 197 if (!swf->audio_fifo) 198 return AVERROR(ENOMEM); 199 } else { 200 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n"); 201 return -1; 202 } 203 } else { 204 if (swf->video_par) { 205 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n"); 206 return AVERROR_INVALIDDATA; 207 } 208 if (par->codec_id == AV_CODEC_ID_VP6F || 209 par->codec_id == AV_CODEC_ID_FLV1 || 210 par->codec_id == AV_CODEC_ID_MJPEG) { 211 swf->video_st = s->streams[i]; 212 swf->video_par = par; 213 } else { 214 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n"); 215 return -1; 216 } 217 } 218 } 219 220 if (!swf->video_par) { 221 /* currently, cannot work correctly if audio only */ 222 width = 320; 223 height = 200; 224 rate = 10; 225 rate_base= 1; 226 } else { 227 width = swf->video_par->width; 228 height = swf->video_par->height; 229 // TODO: should be avg_frame_rate 230 rate = swf->video_st->time_base.den; 231 rate_base = swf->video_st->time_base.num; 232 } 233 234 if (!swf->audio_par) 235 swf->samples_per_frame = (44100LL * rate_base) / rate; 236 else 237 swf->samples_per_frame = (swf->audio_par->sample_rate * rate_base) / rate; 238 239 avio_write(pb, "FWS", 3); 240 241 if (!strcmp("avm2", s->oformat->name)) 242 version = 9; 243 else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_VP6F) 244 version = 8; /* version 8 and above support VP6 codec */ 245 else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLV1) 246 version = 6; /* version 6 and above support FLV1 codec */ 247 else 248 version = 4; /* version 4 for mpeg audio support */ 249 avio_w8(pb, version); 250 251 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size 252 (will be patched if not streamed) */ 253 254 put_swf_rect(pb, 0, width * 20, 0, height * 20); 255 if ((rate * 256LL) / rate_base >= (1<<16)) { 256 av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base); 257 return AVERROR(EINVAL); 258 } 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_par && swf->video_par->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, 1 << FRAC_BITS, 0, 283 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_par && swf->audio_par->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_par->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_par->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 return 0; 341} 342 343static int swf_write_video(AVFormatContext *s, 344 AVCodecParameters *par, const uint8_t *buf, int size) 345{ 346 SWFContext *swf = s->priv_data; 347 AVIOContext *pb = s->pb; 348 349 /* Flash Player limit */ 350 if (swf->swf_frame_number == 16000) 351 av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); 352 353 if (par->codec_id == AV_CODEC_ID_VP6F || 354 par->codec_id == AV_CODEC_ID_FLV1) { 355 if (swf->video_frame_number == 0) { 356 /* create a new video object */ 357 put_swf_tag(s, TAG_VIDEOSTREAM); 358 avio_wl16(pb, VIDEO_ID); 359 swf->vframes_pos = avio_tell(pb); 360 avio_wl16(pb, 15000); /* hard flash player limit */ 361 avio_wl16(pb, par->width); 362 avio_wl16(pb, par->height); 363 avio_w8(pb, 0); 364 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, par->codec_id)); 365 put_swf_end_tag(s); 366 367 /* place the video object for the first time */ 368 put_swf_tag(s, TAG_PLACEOBJECT2); 369 avio_w8(pb, 0x36); 370 avio_wl16(pb, 1); 371 avio_wl16(pb, VIDEO_ID); 372 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0); 373 avio_wl16(pb, swf->video_frame_number); 374 avio_write(pb, "video", 5); 375 avio_w8(pb, 0x00); 376 put_swf_end_tag(s); 377 } else { 378 /* mark the character for update */ 379 put_swf_tag(s, TAG_PLACEOBJECT2); 380 avio_w8(pb, 0x11); 381 avio_wl16(pb, 1); 382 avio_wl16(pb, swf->video_frame_number); 383 put_swf_end_tag(s); 384 } 385 386 /* set video frame data */ 387 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG); 388 avio_wl16(pb, VIDEO_ID); 389 avio_wl16(pb, swf->video_frame_number++); 390 avio_write(pb, buf, size); 391 put_swf_end_tag(s); 392 } else if (par->codec_id == AV_CODEC_ID_MJPEG) { 393 if (swf->swf_frame_number > 0) { 394 /* remove the shape */ 395 put_swf_tag(s, TAG_REMOVEOBJECT); 396 avio_wl16(pb, SHAPE_ID); /* shape ID */ 397 avio_wl16(pb, 1); /* depth */ 398 put_swf_end_tag(s); 399 400 /* free the bitmap */ 401 put_swf_tag(s, TAG_FREECHARACTER); 402 avio_wl16(pb, BITMAP_ID); 403 put_swf_end_tag(s); 404 } 405 406 put_swf_tag(s, TAG_JPEG2 | TAG_LONG); 407 408 avio_wl16(pb, BITMAP_ID); /* ID of the image */ 409 410 /* a dummy jpeg header seems to be required */ 411 avio_wb32(pb, 0xffd8ffd9); 412 /* write the jpeg image */ 413 avio_write(pb, buf, size); 414 415 put_swf_end_tag(s); 416 417 /* draw the shape */ 418 419 put_swf_tag(s, TAG_PLACEOBJECT); 420 avio_wl16(pb, SHAPE_ID); /* shape ID */ 421 avio_wl16(pb, 1); /* depth */ 422 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0); 423 put_swf_end_tag(s); 424 } 425 426 swf->swf_frame_number++; 427 428 /* streaming sound always should be placed just before showframe tags */ 429 if (swf->audio_par && av_fifo_size(swf->audio_fifo)) { 430 int frame_size = av_fifo_size(swf->audio_fifo); 431 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); 432 avio_wl16(pb, swf->sound_samples); 433 avio_wl16(pb, 0); // seek samples 434 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write); 435 put_swf_end_tag(s); 436 437 /* update FIFO */ 438 swf->sound_samples = 0; 439 } 440 441 /* output the frame */ 442 put_swf_tag(s, TAG_SHOWFRAME); 443 put_swf_end_tag(s); 444 445 return 0; 446} 447 448static int swf_write_audio(AVFormatContext *s, 449 AVCodecParameters *par, uint8_t *buf, int size) 450{ 451 SWFContext *swf = s->priv_data; 452 453 /* Flash Player limit */ 454 if (swf->swf_frame_number == 16000) 455 av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); 456 457 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) { 458 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n"); 459 return -1; 460 } 461 462 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL); 463 swf->sound_samples += av_get_audio_frame_duration2(par, size); 464 465 /* if audio only stream make sure we add swf frames */ 466 if (!swf->video_par) 467 swf_write_video(s, par, 0, 0); 468 469 return 0; 470} 471 472static int swf_write_packet(AVFormatContext *s, AVPacket *pkt) 473{ 474 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar; 475 if (par->codec_type == AVMEDIA_TYPE_AUDIO) 476 return swf_write_audio(s, par, pkt->data, pkt->size); 477 else 478 return swf_write_video(s, par, pkt->data, pkt->size); 479} 480 481static int swf_write_trailer(AVFormatContext *s) 482{ 483 SWFContext *swf = s->priv_data; 484 AVIOContext *pb = s->pb; 485 AVCodecParameters *par, *video_par; 486 int file_size, i; 487 488 video_par = NULL; 489 for(i=0;i<s->nb_streams;i++) { 490 par = s->streams[i]->codecpar; 491 if (par->codec_type == AVMEDIA_TYPE_VIDEO) 492 video_par = par; 493 else { 494 av_fifo_freep(&swf->audio_fifo); 495 } 496 } 497 498 put_swf_tag(s, TAG_END); 499 put_swf_end_tag(s); 500 501 /* patch file size and number of frames if not streamed */ 502 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && video_par) { 503 file_size = avio_tell(pb); 504 avio_seek(pb, 4, SEEK_SET); 505 avio_wl32(pb, file_size); 506 avio_seek(pb, swf->duration_pos, SEEK_SET); 507 avio_wl16(pb, swf->video_frame_number); 508 if (swf->vframes_pos) { 509 avio_seek(pb, swf->vframes_pos, SEEK_SET); 510 avio_wl16(pb, swf->video_frame_number); 511 } 512 avio_seek(pb, file_size, SEEK_SET); 513 } 514 return 0; 515} 516 517#if CONFIG_SWF_MUXER 518AVOutputFormat ff_swf_muxer = { 519 .name = "swf", 520 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), 521 .mime_type = "application/x-shockwave-flash", 522 .extensions = "swf", 523 .priv_data_size = sizeof(SWFContext), 524 .audio_codec = AV_CODEC_ID_MP3, 525 .video_codec = AV_CODEC_ID_FLV1, 526 .write_header = swf_write_header, 527 .write_packet = swf_write_packet, 528 .write_trailer = swf_write_trailer, 529 .flags = AVFMT_TS_NONSTRICT, 530}; 531#endif 532#if CONFIG_AVM2_MUXER 533AVOutputFormat ff_avm2_muxer = { 534 .name = "avm2", 535 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"), 536 .mime_type = "application/x-shockwave-flash", 537 .priv_data_size = sizeof(SWFContext), 538 .audio_codec = AV_CODEC_ID_MP3, 539 .video_codec = AV_CODEC_ID_FLV1, 540 .write_header = swf_write_header, 541 .write_packet = swf_write_packet, 542 .write_trailer = swf_write_trailer, 543 .flags = AVFMT_TS_NONSTRICT, 544}; 545#endif