1 /*
2 * Flash Compatible Streaming Format demuxer
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 "config.h"
24
25 #if CONFIG_ZLIB
26 #include <zlib.h>
27 #endif
28
29 #include "libavutil/avassert.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavcodec/get_bits.h"
35 #include "swf.h"
36
37 static const AVCodecTag swf_audio_codec_tags[] = {
38 { AV_CODEC_ID_PCM_S16LE, 0x00 },
39 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
40 { AV_CODEC_ID_MP3, 0x02 },
41 { AV_CODEC_ID_PCM_S16LE, 0x03 },
42 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
43 { AV_CODEC_ID_NONE, 0 },
44 };
45
get_swf_tag(AVIOContext * pb,int * len_ptr)46 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
47 {
48 int tag, len;
49
50 if (avio_feof(pb))
51 return AVERROR_EOF;
52
53 tag = avio_rl16(pb);
54 len = tag & 0x3f;
55 tag = tag >> 6;
56 if (len == 0x3f) {
57 len = avio_rl32(pb);
58 }
59 *len_ptr = len;
60 return tag;
61 }
62
63
swf_probe(const AVProbeData * p)64 static int swf_probe(const AVProbeData *p)
65 {
66 GetBitContext gb;
67 int len, xmin, xmax, ymin, ymax;
68
69 if(p->buf_size < 15)
70 return 0;
71
72 /* check file header */
73 if ( AV_RB24(p->buf) != AV_RB24("CWS")
74 && AV_RB24(p->buf) != AV_RB24("FWS"))
75 return 0;
76
77 if ( AV_RB24(p->buf) == AV_RB24("CWS")
78 && p->buf[3] <= 20)
79 return AVPROBE_SCORE_MAX / 4 + 1;
80
81 if (init_get_bits8(&gb, p->buf + 3, p->buf_size - 3) < 0)
82 return 0;
83
84 skip_bits(&gb, 40);
85 len = get_bits(&gb, 5);
86 if (!len)
87 return 0;
88 xmin = get_bits_long(&gb, len);
89 xmax = get_bits_long(&gb, len);
90 ymin = get_bits_long(&gb, len);
91 ymax = get_bits_long(&gb, len);
92 if (xmin || ymin || !xmax || !ymax)
93 return 0;
94
95 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
96 return AVPROBE_SCORE_MAX / 4;
97
98 return AVPROBE_SCORE_EXTENSION + 1;
99 }
100
101 #if CONFIG_ZLIB
zlib_refill(void * opaque,uint8_t * buf,int buf_size)102 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
103 {
104 AVFormatContext *s = opaque;
105 SWFContext *swf = s->priv_data;
106 z_stream *z = &swf->zstream;
107 int ret;
108
109 retry:
110 if (!z->avail_in) {
111 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
112 if (n < 0)
113 return n;
114 z->next_in = swf->zbuf_in;
115 z->avail_in = n;
116 }
117
118 z->next_out = buf;
119 z->avail_out = buf_size;
120
121 ret = inflate(z, Z_NO_FLUSH);
122 if (ret == Z_STREAM_END)
123 return AVERROR_EOF;
124 if (ret != Z_OK)
125 return AVERROR(EINVAL);
126
127 if (buf_size - z->avail_out == 0)
128 goto retry;
129
130 return buf_size - z->avail_out;
131 }
132 #endif
133
swf_read_header(AVFormatContext * s)134 static int swf_read_header(AVFormatContext *s)
135 {
136 SWFContext *swf = s->priv_data;
137 AVIOContext *pb = s->pb;
138 int nbits, len, tag;
139
140 tag = avio_rb32(pb) & 0xffffff00;
141 avio_rl32(pb);
142
143 if (tag == MKBETAG('C', 'W', 'S', 0)) {
144 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
145 #if CONFIG_ZLIB
146 swf->zbuf_in = av_malloc(ZBUF_SIZE);
147 swf->zbuf_out = av_malloc(ZBUF_SIZE);
148 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
149 zlib_refill, NULL, NULL);
150 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
151 return AVERROR(ENOMEM);
152 swf->zpb->seekable = 0;
153 if (inflateInit(&swf->zstream) != Z_OK) {
154 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
155 av_freep(&swf->zbuf_in);
156 av_freep(&swf->zbuf_out);
157 return AVERROR(EINVAL);
158 }
159 pb = swf->zpb;
160 #else
161 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
162 return AVERROR(EIO);
163 #endif
164 } else if (tag != MKBETAG('F', 'W', 'S', 0))
165 return AVERROR(EIO);
166 /* skip rectangle size */
167 nbits = avio_r8(pb) >> 3;
168 len = (4 * nbits - 3 + 7) / 8;
169 avio_skip(pb, len);
170 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
171 avio_rl16(pb); /* frame count */
172
173 swf->samples_per_frame = 0;
174 s->ctx_flags |= AVFMTCTX_NOHEADER;
175 return 0;
176 }
177
create_new_audio_stream(AVFormatContext * s,int id,int info)178 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
179 {
180 int sample_rate_code, sample_size_code;
181 AVStream *ast = avformat_new_stream(s, NULL);
182 if (!ast)
183 return NULL;
184 ast->id = id;
185 if (info & 1) {
186 ast->codecpar->channels = 2;
187 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
188 } else {
189 ast->codecpar->channels = 1;
190 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
191 }
192 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
193 ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
194 ast->need_parsing = AVSTREAM_PARSE_FULL;
195 sample_rate_code = info>>2 & 3;
196 sample_size_code = info>>1 & 1;
197 if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
198 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
199 ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
200 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
201 return ast;
202 }
203
swf_read_packet(AVFormatContext * s,AVPacket * pkt)204 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
205 {
206 SWFContext *swf = s->priv_data;
207 AVIOContext *pb = s->pb;
208 AVStream *vst = NULL, *ast = NULL, *st = 0;
209 int tag, len, i, frame, v, res;
210
211 #if CONFIG_ZLIB
212 if (swf->zpb)
213 pb = swf->zpb;
214 #endif
215
216 for(;;) {
217 uint64_t pos = avio_tell(pb);
218 tag = get_swf_tag(pb, &len);
219 if (tag < 0)
220 return tag;
221 if (len < 0) {
222 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
223 return AVERROR_INVALIDDATA;
224 }
225 if (tag == TAG_VIDEOSTREAM) {
226 int ch_id = avio_rl16(pb);
227 len -= 2;
228
229 for (i=0; i<s->nb_streams; i++) {
230 st = s->streams[i];
231 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
232 goto skip;
233 }
234
235 avio_rl16(pb);
236 avio_rl16(pb);
237 avio_rl16(pb);
238 avio_r8(pb);
239 /* Check for FLV1 */
240 vst = avformat_new_stream(s, NULL);
241 if (!vst)
242 return AVERROR(ENOMEM);
243 vst->id = ch_id;
244 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
245 vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
246 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
247 len -= 8;
248 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
249 /* streaming found */
250
251 for (i=0; i<s->nb_streams; i++) {
252 st = s->streams[i];
253 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
254 goto skip;
255 }
256
257 avio_r8(pb);
258 v = avio_r8(pb);
259 swf->samples_per_frame = avio_rl16(pb);
260 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
261 if (!ast)
262 return AVERROR(ENOMEM);
263 len -= 4;
264 } else if (tag == TAG_DEFINESOUND) {
265 /* audio stream */
266 int ch_id = avio_rl16(pb);
267
268 for (i=0; i<s->nb_streams; i++) {
269 st = s->streams[i];
270 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
271 goto skip;
272 }
273
274 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
275 // these are smaller audio streams in DEFINESOUND tags, but it's technically
276 // possible they could be huge. Break it up into multiple packets if it's big.
277 v = avio_r8(pb);
278 ast = create_new_audio_stream(s, ch_id, v);
279 if (!ast)
280 return AVERROR(ENOMEM);
281 ast->duration = avio_rl32(pb); // number of samples
282 if (((v>>4) & 15) == 2) { // MP3 sound data record
283 ast->skip_samples = avio_rl16(pb);
284 len -= 2;
285 }
286 len -= 7;
287 if ((res = av_get_packet(pb, pkt, len)) < 0)
288 return res;
289 pkt->pos = pos;
290 pkt->stream_index = ast->index;
291 return pkt->size;
292 } else if (tag == TAG_VIDEOFRAME) {
293 int ch_id = avio_rl16(pb);
294 len -= 2;
295 for(i=0; i<s->nb_streams; i++) {
296 st = s->streams[i];
297 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
298 frame = avio_rl16(pb);
299 len -= 2;
300 if (len <= 0)
301 goto skip;
302 if ((res = av_get_packet(pb, pkt, len)) < 0)
303 return res;
304 pkt->pos = pos;
305 pkt->pts = frame;
306 pkt->stream_index = st->index;
307 return pkt->size;
308 }
309 }
310 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
311 #if CONFIG_ZLIB
312 long out_len;
313 uint8_t *buf = NULL, *zbuf = NULL, *pal;
314 uint32_t colormap[AVPALETTE_COUNT] = {0};
315 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
316 const int colormapbpp = 3 + alpha_bmp;
317 int linesize, colormapsize = 0;
318
319 const int ch_id = avio_rl16(pb);
320 const int bmp_fmt = avio_r8(pb);
321 const int width = avio_rl16(pb);
322 const int height = avio_rl16(pb);
323 int pix_fmt;
324
325 len -= 2+1+2+2;
326
327 switch (bmp_fmt) {
328 case 3: // PAL-8
329 linesize = width;
330 colormapsize = avio_r8(pb) + 1;
331 len--;
332 break;
333 case 4: // RGB15
334 linesize = width * 2;
335 break;
336 case 5: // RGB24 (0RGB)
337 linesize = width * 4;
338 break;
339 default:
340 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
341 goto bitmap_end_skip;
342 }
343
344 linesize = FFALIGN(linesize, 4);
345
346 if (av_image_check_size(width, height, 0, s) < 0 ||
347 linesize >= INT_MAX / height ||
348 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
349 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
350 goto bitmap_end_skip;
351 }
352
353 out_len = colormapsize * colormapbpp + linesize * height;
354
355 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
356 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
357
358 zbuf = av_malloc(len);
359 buf = av_malloc(out_len);
360 if (!zbuf || !buf) {
361 res = AVERROR(ENOMEM);
362 goto bitmap_end;
363 }
364
365 len = avio_read(pb, zbuf, len);
366 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
367 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
368 goto bitmap_end_skip;
369 }
370
371 for (i = 0; i < s->nb_streams; i++) {
372 st = s->streams[i];
373 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
374 break;
375 }
376 if (i == s->nb_streams) {
377 vst = avformat_new_stream(s, NULL);
378 if (!vst) {
379 res = AVERROR(ENOMEM);
380 goto bitmap_end;
381 }
382 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
383 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
384 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
385 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
386 st = vst;
387 }
388
389 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
390 goto bitmap_end;
391 if (!st->codecpar->width && !st->codecpar->height) {
392 st->codecpar->width = width;
393 st->codecpar->height = height;
394 } else {
395 ff_add_param_change(pkt, 0, 0, 0, width, height);
396 }
397 pkt->pos = pos;
398 pkt->stream_index = st->index;
399
400 if (linesize * height > pkt->size) {
401 res = AVERROR_INVALIDDATA;
402 goto bitmap_end;
403 }
404
405 switch (bmp_fmt) {
406 case 3:
407 pix_fmt = AV_PIX_FMT_PAL8;
408 for (i = 0; i < colormapsize; i++)
409 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
410 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
411 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
412 if (!pal) {
413 res = AVERROR(ENOMEM);
414 goto bitmap_end;
415 }
416 memcpy(pal, colormap, AVPALETTE_SIZE);
417 break;
418 case 4:
419 pix_fmt = AV_PIX_FMT_RGB555;
420 break;
421 case 5:
422 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
423 break;
424 default:
425 av_assert0(0);
426 }
427 if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
428 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
429 } else
430 st->codecpar->format = pix_fmt;
431
432 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
433
434 res = pkt->size;
435
436 bitmap_end:
437 av_freep(&zbuf);
438 av_freep(&buf);
439 return res;
440 bitmap_end_skip:
441 av_freep(&zbuf);
442 av_freep(&buf);
443 #else
444 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
445 #endif
446 } else if (tag == TAG_STREAMBLOCK) {
447 for (i = 0; i < s->nb_streams; i++) {
448 st = s->streams[i];
449 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
450 if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
451 avio_skip(pb, 4);
452 len -= 4;
453 if (len <= 0)
454 goto skip;
455 if ((res = av_get_packet(pb, pkt, len)) < 0)
456 return res;
457 } else { // ADPCM, PCM
458 if (len <= 0)
459 goto skip;
460 if ((res = av_get_packet(pb, pkt, len)) < 0)
461 return res;
462 }
463 pkt->pos = pos;
464 pkt->stream_index = st->index;
465 return pkt->size;
466 }
467 }
468 } else if (tag == TAG_JPEG2) {
469 for (i=0; i<s->nb_streams; i++) {
470 st = s->streams[i];
471 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
472 break;
473 }
474 if (i == s->nb_streams) {
475 vst = avformat_new_stream(s, NULL);
476 if (!vst)
477 return AVERROR(ENOMEM);
478 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
479 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
480 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
481 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
482 st = vst;
483 }
484 avio_rl16(pb); /* BITMAP_ID */
485 len -= 2;
486 if (len < 4)
487 goto skip;
488 if ((res = av_new_packet(pkt, len)) < 0)
489 return res;
490 if (avio_read(pb, pkt->data, 4) != 4) {
491 return AVERROR_INVALIDDATA;
492 }
493 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
494 AV_RB32(pkt->data) == 0xffd9ffd8) {
495 /* old SWF files containing SOI/EOI as data start */
496 /* files created by swink have reversed tag */
497 pkt->size -= 4;
498 memset(pkt->data+pkt->size, 0, 4);
499 res = avio_read(pb, pkt->data, pkt->size);
500 } else {
501 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
502 if (res >= 0)
503 res += 4;
504 }
505 if (res != pkt->size) {
506 if (res < 0) {
507 return res;
508 }
509 av_shrink_packet(pkt, res);
510 }
511
512 pkt->pos = pos;
513 pkt->stream_index = st->index;
514 return pkt->size;
515 } else {
516 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
517 }
518 skip:
519 if(len<0)
520 av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
521 len = FFMAX(0, len);
522 avio_skip(pb, len);
523 }
524 }
525
526 #if CONFIG_ZLIB
swf_read_close(AVFormatContext * avctx)527 static av_cold int swf_read_close(AVFormatContext *avctx)
528 {
529 SWFContext *s = avctx->priv_data;
530 inflateEnd(&s->zstream);
531 av_freep(&s->zbuf_in);
532 av_freep(&s->zbuf_out);
533 avio_context_free(&s->zpb);
534 return 0;
535 }
536 #endif
537
538 AVInputFormat ff_swf_demuxer = {
539 .name = "swf",
540 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
541 .priv_data_size = sizeof(SWFContext),
542 .read_probe = swf_probe,
543 .read_header = swf_read_header,
544 .read_packet = swf_read_packet,
545 #if CONFIG_ZLIB
546 .read_close = swf_read_close,
547 #endif
548 };
549