FFmpeg: libavformat/swfdec.c Source File

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libavformat

swfdec.c

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1 /*

2 * Flash Compatible Streaming Format demuxer

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 */

23 #include "libavutil/avassert.h"

24 #include "libavutil/channel_layout.h"

25 #include "libavutil/imgutils.h"

26 #include "libavutil/intreadwrite.h"

27 #include "libavcodec/get_bits.h"

28 #include "swf.h"

30 static const AVCodecTag swf_audio_codec_tags[] = {

31 { AV_CODEC_ID_PCM_S16LE, 0x00 },

32 { AV_CODEC_ID_ADPCM_SWF, 0x01 },

33 { AV_CODEC_ID_MP3, 0x02 },

34 { AV_CODEC_ID_PCM_S16LE, 0x03 },

35 // { AV_CODEC_ID_NELLYMOSER, 0x06 },

36 { AV_CODEC_ID_NONE, 0 },

37 };

39 static int get_swf_tag(AVIOContext *pb, int *len_ptr)

40 {

41 int tag, len;

43 if (avio_feof(pb))

44 return AVERROR_EOF;

46 tag = avio_rl16(pb);

47 len = tag & 0x3f;

48 tag = tag >> 6;

49 if (len == 0x3f) {

50 len = avio_rl32(pb);

51 }

52 *len_ptr = len;

53 return tag;

54 }

57 static int swf_probe(AVProbeData *p)

58 {

59 GetBitContext gb;

60 int len, xmin, xmax, ymin, ymax;

62 if(p->buf_size < 15)

63 return 0;

65 /* check file header */

66 if ( AV_RB24(p->buf) != AV_RB24("CWS")

67 && AV_RB24(p->buf) != AV_RB24("FWS"))

68 return 0;

70 init_get_bits8(&gb, p->buf + 3, p->buf_size - 3);

72 skip_bits(&gb, 40);

73 len = get_bits(&gb, 5);

74 if (!len)

75 return 0;

76 xmin = get_bits_long(&gb, len);

77 xmax = get_bits_long(&gb, len);

78 ymin = get_bits_long(&gb, len);

79 ymax = get_bits_long(&gb, len);

80 if (xmin || ymin || !xmax || !ymax)

81 return 0;

83 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)

84 return AVPROBE_SCORE_MAX / 4;

86 return AVPROBE_SCORE_MAX;

87 }

89 #if CONFIG_ZLIB

90 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)

91 {

92 AVFormatContext *s = opaque;

93 SWFContext *swf = s->priv_data;

94 z_stream *z = &swf->zstream;

95 int ret;

97 retry:

98 if (!z->avail_in) {

99 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);

100 if (n < 0)

101 return n;

102 z->next_in = swf->zbuf_in;

103 z->avail_in = n;

104 }

105

106 z->next_out = buf;

107 z->avail_out = buf_size;

108

109 ret = inflate(z, Z_NO_FLUSH);

110 if (ret < 0)

111 return AVERROR(EINVAL);

112 if (ret == Z_STREAM_END)

113 return AVERROR_EOF;

114

115 if (buf_size - z->avail_out == 0)

116 goto retry;

117

118 return buf_size - z->avail_out;

119 }

120 #endif

121

122 static int swf_read_header(AVFormatContext *s)

123 {

124 SWFContext *swf = s->priv_data;

125 AVIOContext *pb = s->pb;

126 int nbits, len, tag;

127

128 tag = avio_rb32(pb) & 0xffffff00;

129 avio_rl32(pb);

130

131 if (tag == MKBETAG('C', 'W', 'S', 0)) {

132 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");

133 #if CONFIG_ZLIB

134 swf->zbuf_in = av_malloc(ZBUF_SIZE);

135 swf->zbuf_out = av_malloc(ZBUF_SIZE);

136 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,

137 zlib_refill, NULL, NULL);

138 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)

139 return AVERROR(ENOMEM);

140 swf->zpb->seekable = 0;

141 if (inflateInit(&swf->zstream) != Z_OK) {

142 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");

143 return AVERROR(EINVAL);

144 }

145 pb = swf->zpb;

146 #else

147 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");

148 return AVERROR(EIO);

149 #endif

150 } else if (tag != MKBETAG('F', 'W', 'S', 0))

151 return AVERROR(EIO);

152 /* skip rectangle size */

153 nbits = avio_r8(pb) >> 3;

154 len = (4 * nbits - 3 + 7) / 8;

155 avio_skip(pb, len);

156 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */

157 avio_rl16(pb); /* frame count */

158

159 swf->samples_per_frame = 0;

160 s->ctx_flags |= AVFMTCTX_NOHEADER;

161 return 0;

162 }

163

164 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)

165 {

166 int sample_rate_code, sample_size_code;

167 AVStream *ast = avformat_new_stream(s, NULL);

168 if (!ast)

169 return NULL;

170 ast->id = id;

171 if (info & 1) {

172 ast->codec->channels = 2;

173 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;

174 } else {

175 ast->codec->channels = 1;

176 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;

177 }

178 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

179 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);

180 ast->need_parsing = AVSTREAM_PARSE_FULL;

181 sample_rate_code = info>>2 & 3;

182 sample_size_code = info>>1 & 1;

183 if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE)

184 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;

185 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);

186 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);

187 return ast;

188 }

189

190 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)

191 {

192 SWFContext *swf = s->priv_data;

193 AVIOContext *pb = s->pb;

194 AVStream *vst = NULL, *ast = NULL, *st = 0;

195 int tag, len, i, frame, v, res;

196

197 #if CONFIG_ZLIB

198 if (swf->zpb)

199 pb = swf->zpb;

200 #endif

201

202 for(;;) {

203 uint64_t pos = avio_tell(pb);

204 tag = get_swf_tag(pb, &len);

205 if (tag < 0)

206 return tag;

207 if (len < 0) {

208 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);

209 return AVERROR_INVALIDDATA;

210 }

211 if (tag == TAG_VIDEOSTREAM) {

212 int ch_id = avio_rl16(pb);

213 len -= 2;

214

215 for (i=0; i<s->nb_streams; i++) {

216 st = s->streams[i];

217 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)

218 goto skip;

219 }

220

221 avio_rl16(pb);

222 avio_rl16(pb);

223 avio_rl16(pb);

224 avio_r8(pb);

225 /* Check for FLV1 */

226 vst = avformat_new_stream(s, NULL);

227 if (!vst)

228 return AVERROR(ENOMEM);

229 vst->id = ch_id;

230 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;

231 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));

232 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);

233 len -= 8;

234 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {

235 /* streaming found */

236

237 for (i=0; i<s->nb_streams; i++) {

238 st = s->streams[i];

239 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)

240 goto skip;

241 }

242

243 avio_r8(pb);

244 v = avio_r8(pb);

245 swf->samples_per_frame = avio_rl16(pb);

246 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */

247 if (!ast)

248 return AVERROR(ENOMEM);

249 len -= 4;

250 } else if (tag == TAG_DEFINESOUND) {

251 /* audio stream */

252 int ch_id = avio_rl16(pb);

253

254 for (i=0; i<s->nb_streams; i++) {

255 st = s->streams[i];

256 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)

257 goto skip;

258 }

259

260 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,

261 // these are smaller audio streams in DEFINESOUND tags, but it's technically

262 // possible they could be huge. Break it up into multiple packets if it's big.

263 v = avio_r8(pb);

264 ast = create_new_audio_stream(s, ch_id, v);

265 if (!ast)

266 return AVERROR(ENOMEM);

267 ast->duration = avio_rl32(pb); // number of samples

268 if (((v>>4) & 15) == 2) { // MP3 sound data record

269 ast->skip_samples = avio_rl16(pb);

270 len -= 2;

271 }

272 len -= 7;

273 if ((res = av_get_packet(pb, pkt, len)) < 0)

274 return res;

275 pkt->pos = pos;

276 pkt->stream_index = ast->index;

277 return pkt->size;

278 } else if (tag == TAG_VIDEOFRAME) {

279 int ch_id = avio_rl16(pb);

280 len -= 2;

281 for(i=0; i<s->nb_streams; i++) {

282 st = s->streams[i];

283 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {

284 frame = avio_rl16(pb);

285 len -= 2;

286 if (len <= 0)

287 goto skip;

288 if ((res = av_get_packet(pb, pkt, len)) < 0)

289 return res;

290 pkt->pos = pos;

291 pkt->pts = frame;

292 pkt->stream_index = st->index;

293 return pkt->size;

294 }

295 }

296 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {

297 #if CONFIG_ZLIB

298 long out_len;

299 uint8_t *buf = NULL, *zbuf = NULL, *pal;

300 uint32_t colormap[AVPALETTE_COUNT] = {0};

301 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;

302 const int colormapbpp = 3 + alpha_bmp;

303 int linesize, colormapsize = 0;

304

305 const int ch_id = avio_rl16(pb);

306 const int bmp_fmt = avio_r8(pb);

307 const int width = avio_rl16(pb);

308 const int height = avio_rl16(pb);

309 int pix_fmt;

310

311 len -= 2+1+2+2;

312

313 switch (bmp_fmt) {

314 case 3: // PAL-8

315 linesize = width;

316 colormapsize = avio_r8(pb) + 1;

317 len--;

318 break;

319 case 4: // RGB15

320 linesize = width * 2;

321 break;

322 case 5: // RGB24 (0RGB)

323 linesize = width * 4;

324 break;

325 default:

326 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);

327 goto bitmap_end_skip;

328 }

329

330 linesize = FFALIGN(linesize, 4);

331

332 if (av_image_check_size(width, height, 0, s) < 0 ||

333 linesize >= INT_MAX / height ||

334 linesize * height >= INT_MAX - colormapsize * colormapbpp) {

335 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);

336 goto bitmap_end_skip;

337 }

338

339 out_len = colormapsize * colormapbpp + linesize * height;

340

341 av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",

342 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);

343

344 zbuf = av_malloc(len);

345 buf = av_malloc(out_len);

346 if (!zbuf || !buf) {

347 res = AVERROR(ENOMEM);

348 goto bitmap_end;

349 }

350

351 len = avio_read(pb, zbuf, len);

352 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {

353 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");

354 goto bitmap_end_skip;

355 }

356

357 for (i = 0; i < s->nb_streams; i++) {

358 st = s->streams[i];

359 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)

360 break;

361 }

362 if (i == s->nb_streams) {

363 vst = avformat_new_stream(s, NULL);

364 if (!vst) {

365 res = AVERROR(ENOMEM);

366 goto bitmap_end;

367 }

368 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */

369 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;

370 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;

371 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);

372 st = vst;

373 }

374

375 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)

376 goto bitmap_end;

377 if (!st->codec->width && !st->codec->height) {

378 st->codec->width = width;

379 st->codec->height = height;

380 } else {

381 ff_add_param_change(pkt, 0, 0, 0, width, height);

382 }

383 pkt->pos = pos;

384 pkt->stream_index = st->index;

385

386 switch (bmp_fmt) {

387 case 3:

388 pix_fmt = AV_PIX_FMT_PAL8;

389 for (i = 0; i < colormapsize; i++)

390 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);

391 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);

392 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

393 if (!pal) {

394 res = AVERROR(ENOMEM);

395 goto bitmap_end;

396 }

397 memcpy(pal, colormap, AVPALETTE_SIZE);

398 break;

399 case 4:

400 pix_fmt = AV_PIX_FMT_RGB555;

401 break;

402 case 5:

403 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;

404 break;

405 default:

406 av_assert0(0);

407 }

408 if (st->codec->pix_fmt != AV_PIX_FMT_NONE && st->codec->pix_fmt != pix_fmt) {

409 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");

410 res = AVERROR_PATCHWELCOME;

411 goto bitmap_end;

412 }

413 st->codec->pix_fmt = pix_fmt;

414

415 if (linesize * height > pkt->size) {

416 res = AVERROR_INVALIDDATA;

417 goto bitmap_end;

418 }

419 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);

420

421 res = pkt->size;

422

423 bitmap_end:

424 av_freep(&zbuf);

425 av_freep(&buf);

426 return res;

427 bitmap_end_skip:

428 av_freep(&zbuf);

429 av_freep(&buf);

430 #else

431 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

432 #endif

433 } else if (tag == TAG_STREAMBLOCK) {

434 for (i = 0; i < s->nb_streams; i++) {

435 st = s->streams[i];

436 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {

437 if (st->codec->codec_id == AV_CODEC_ID_MP3) {

438 avio_skip(pb, 4);

439 len -= 4;

440 if (len <= 0)

441 goto skip;

442 if ((res = av_get_packet(pb, pkt, len)) < 0)

443 return res;

444 } else { // ADPCM, PCM

445 if (len <= 0)

446 goto skip;

447 if ((res = av_get_packet(pb, pkt, len)) < 0)

448 return res;

449 }

450 pkt->pos = pos;

451 pkt->stream_index = st->index;

452 return pkt->size;

453 }

454 }

455 } else if (tag == TAG_JPEG2) {

456 for (i=0; i<s->nb_streams; i++) {

457 st = s->streams[i];

458 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)

459 break;

460 }

461 if (i == s->nb_streams) {

462 vst = avformat_new_stream(s, NULL);

463 if (!vst)

464 return AVERROR(ENOMEM);

465 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */

466 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;

467 vst->codec->codec_id = AV_CODEC_ID_MJPEG;

468 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);

469 st = vst;

470 }

471 avio_rl16(pb); /* BITMAP_ID */

472 len -= 2;

473 if (len < 4)

474 goto skip;

475 if ((res = av_new_packet(pkt, len)) < 0)

476 return res;

477 if (avio_read(pb, pkt->data, 4) != 4) {

478 av_free_packet(pkt);

479 return AVERROR_INVALIDDATA;

480 }

481 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||

482 AV_RB32(pkt->data) == 0xffd9ffd8) {

483 /* old SWF files containing SOI/EOI as data start */

484 /* files created by swink have reversed tag */

485 pkt->size -= 4;

486 memset(pkt->data+pkt->size, 0, 4);

487 res = avio_read(pb, pkt->data, pkt->size);

488 } else {

489 res = avio_read(pb, pkt->data + 4, pkt->size - 4);

490 if (res >= 0)

491 res += 4;

492 }

493 if (res != pkt->size) {

494 if (res < 0) {

495 av_free_packet(pkt);

496 return res;

497 }

498 av_shrink_packet(pkt, res);

499 }

500

501 pkt->pos = pos;

502 pkt->stream_index = st->index;

503 return pkt->size;

504 } else {

505 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);

506 }

507 skip:

508 if(len<0)

509 av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);

510 len = FFMAX(0, len);

511 avio_skip(pb, len);

512 }

513 }

514

515 #if CONFIG_ZLIB

516 static av_cold int swf_read_close(AVFormatContext *avctx)

517 {

518 SWFContext *s = avctx->priv_data;

519 inflateEnd(&s->zstream);

520 av_freep(&s->zbuf_in);

521 av_freep(&s->zbuf_out);

522 av_freep(&s->zpb);

523 return 0;

524 }

525 #endif

526

527 AVInputFormat ff_swf_demuxer = {

528 .name = "swf",

529 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),

530 .priv_data_size = sizeof(SWFContext),

531 .read_probe = swf_probe,

532 .read_header = swf_read_header,

533 .read_packet = swf_read_packet,

534 #if CONFIG_ZLIB

535 .read_close = swf_read_close,

536 #endif

537 };

Generated on Sun Mar 8 2015 02:35:13 for FFmpeg by doxygen 1.8.2