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path: root/libavformat/swfdec.c (plain)
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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
37static 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
46static 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
64static int swf_probe(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_MAX;
99}
100
101#if CONFIG_ZLIB
102static 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
109retry:
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
134static 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 return AVERROR(EINVAL);
156 }
157 pb = swf->zpb;
158#else
159 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
160 return AVERROR(EIO);
161#endif
162 } else if (tag != MKBETAG('F', 'W', 'S', 0))
163 return AVERROR(EIO);
164 /* skip rectangle size */
165 nbits = avio_r8(pb) >> 3;
166 len = (4 * nbits - 3 + 7) / 8;
167 avio_skip(pb, len);
168 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
169 avio_rl16(pb); /* frame count */
170
171 swf->samples_per_frame = 0;
172 s->ctx_flags |= AVFMTCTX_NOHEADER;
173 return 0;
174}
175
176static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
177{
178 int sample_rate_code, sample_size_code;
179 AVStream *ast = avformat_new_stream(s, NULL);
180 if (!ast)
181 return NULL;
182 ast->id = id;
183 if (info & 1) {
184 ast->codecpar->channels = 2;
185 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
186 } else {
187 ast->codecpar->channels = 1;
188 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
189 }
190 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
191 ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
192 ast->need_parsing = AVSTREAM_PARSE_FULL;
193 sample_rate_code = info>>2 & 3;
194 sample_size_code = info>>1 & 1;
195 if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
196 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
197 ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
198 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
199 return ast;
200}
201
202static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
203{
204 SWFContext *swf = s->priv_data;
205 AVIOContext *pb = s->pb;
206 AVStream *vst = NULL, *ast = NULL, *st = 0;
207 int tag, len, i, frame, v, res;
208
209#if CONFIG_ZLIB
210 if (swf->zpb)
211 pb = swf->zpb;
212#endif
213
214 for(;;) {
215 uint64_t pos = avio_tell(pb);
216 tag = get_swf_tag(pb, &len);
217 if (tag < 0)
218 return tag;
219 if (len < 0) {
220 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
221 return AVERROR_INVALIDDATA;
222 }
223 if (tag == TAG_VIDEOSTREAM) {
224 int ch_id = avio_rl16(pb);
225 len -= 2;
226
227 for (i=0; i<s->nb_streams; i++) {
228 st = s->streams[i];
229 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
230 goto skip;
231 }
232
233 avio_rl16(pb);
234 avio_rl16(pb);
235 avio_rl16(pb);
236 avio_r8(pb);
237 /* Check for FLV1 */
238 vst = avformat_new_stream(s, NULL);
239 if (!vst)
240 return AVERROR(ENOMEM);
241 vst->id = ch_id;
242 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
243 vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
244 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
245 len -= 8;
246 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
247 /* streaming found */
248
249 for (i=0; i<s->nb_streams; i++) {
250 st = s->streams[i];
251 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
252 goto skip;
253 }
254
255 avio_r8(pb);
256 v = avio_r8(pb);
257 swf->samples_per_frame = avio_rl16(pb);
258 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
259 if (!ast)
260 return AVERROR(ENOMEM);
261 len -= 4;
262 } else if (tag == TAG_DEFINESOUND) {
263 /* audio stream */
264 int ch_id = avio_rl16(pb);
265
266 for (i=0; i<s->nb_streams; i++) {
267 st = s->streams[i];
268 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
269 goto skip;
270 }
271
272 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
273 // these are smaller audio streams in DEFINESOUND tags, but it's technically
274 // possible they could be huge. Break it up into multiple packets if it's big.
275 v = avio_r8(pb);
276 ast = create_new_audio_stream(s, ch_id, v);
277 if (!ast)
278 return AVERROR(ENOMEM);
279 ast->duration = avio_rl32(pb); // number of samples
280 if (((v>>4) & 15) == 2) { // MP3 sound data record
281 ast->skip_samples = avio_rl16(pb);
282 len -= 2;
283 }
284 len -= 7;
285 if ((res = av_get_packet(pb, pkt, len)) < 0)
286 return res;
287 pkt->pos = pos;
288 pkt->stream_index = ast->index;
289 return pkt->size;
290 } else if (tag == TAG_VIDEOFRAME) {
291 int ch_id = avio_rl16(pb);
292 len -= 2;
293 for(i=0; i<s->nb_streams; i++) {
294 st = s->streams[i];
295 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
296 frame = avio_rl16(pb);
297 len -= 2;
298 if (len <= 0)
299 goto skip;
300 if ((res = av_get_packet(pb, pkt, len)) < 0)
301 return res;
302 pkt->pos = pos;
303 pkt->pts = frame;
304 pkt->stream_index = st->index;
305 return pkt->size;
306 }
307 }
308 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
309#if CONFIG_ZLIB
310 long out_len;
311 uint8_t *buf = NULL, *zbuf = NULL, *pal;
312 uint32_t colormap[AVPALETTE_COUNT] = {0};
313 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
314 const int colormapbpp = 3 + alpha_bmp;
315 int linesize, colormapsize = 0;
316
317 const int ch_id = avio_rl16(pb);
318 const int bmp_fmt = avio_r8(pb);
319 const int width = avio_rl16(pb);
320 const int height = avio_rl16(pb);
321 int pix_fmt;
322
323 len -= 2+1+2+2;
324
325 switch (bmp_fmt) {
326 case 3: // PAL-8
327 linesize = width;
328 colormapsize = avio_r8(pb) + 1;
329 len--;
330 break;
331 case 4: // RGB15
332 linesize = width * 2;
333 break;
334 case 5: // RGB24 (0RGB)
335 linesize = width * 4;
336 break;
337 default:
338 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
339 goto bitmap_end_skip;
340 }
341
342 linesize = FFALIGN(linesize, 4);
343
344 if (av_image_check_size(width, height, 0, s) < 0 ||
345 linesize >= INT_MAX / height ||
346 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
347 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
348 goto bitmap_end_skip;
349 }
350
351 out_len = colormapsize * colormapbpp + linesize * height;
352
353 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
354 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
355
356 zbuf = av_malloc(len);
357 buf = av_malloc(out_len);
358 if (!zbuf || !buf) {
359 res = AVERROR(ENOMEM);
360 goto bitmap_end;
361 }
362
363 len = avio_read(pb, zbuf, len);
364 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
365 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
366 goto bitmap_end_skip;
367 }
368
369 for (i = 0; i < s->nb_streams; i++) {
370 st = s->streams[i];
371 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
372 break;
373 }
374 if (i == s->nb_streams) {
375 vst = avformat_new_stream(s, NULL);
376 if (!vst) {
377 res = AVERROR(ENOMEM);
378 goto bitmap_end;
379 }
380 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
381 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
382 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
383 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
384 st = vst;
385 }
386
387 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
388 goto bitmap_end;
389 if (!st->codecpar->width && !st->codecpar->height) {
390 st->codecpar->width = width;
391 st->codecpar->height = height;
392 } else {
393 ff_add_param_change(pkt, 0, 0, 0, width, height);
394 }
395 pkt->pos = pos;
396 pkt->stream_index = st->index;
397
398 if (linesize * height > pkt->size) {
399 res = AVERROR_INVALIDDATA;
400 av_packet_unref(pkt);
401 goto bitmap_end;
402 }
403
404 switch (bmp_fmt) {
405 case 3:
406 pix_fmt = AV_PIX_FMT_PAL8;
407 for (i = 0; i < colormapsize; i++)
408 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
409 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
410 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
411 if (!pal) {
412 res = AVERROR(ENOMEM);
413 goto bitmap_end;
414 }
415 memcpy(pal, colormap, AVPALETTE_SIZE);
416 break;
417 case 4:
418 pix_fmt = AV_PIX_FMT_RGB555;
419 break;
420 case 5:
421 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
422 break;
423 default:
424 av_assert0(0);
425 }
426 if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
427 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
428 } else
429 st->codecpar->format = pix_fmt;
430
431 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
432
433 res = pkt->size;
434
435bitmap_end:
436 av_freep(&zbuf);
437 av_freep(&buf);
438 return res;
439bitmap_end_skip:
440 av_freep(&zbuf);
441 av_freep(&buf);
442#else
443 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
444#endif
445 } else if (tag == TAG_STREAMBLOCK) {
446 for (i = 0; i < s->nb_streams; i++) {
447 st = s->streams[i];
448 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
449 if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
450 avio_skip(pb, 4);
451 len -= 4;
452 if (len <= 0)
453 goto skip;
454 if ((res = av_get_packet(pb, pkt, len)) < 0)
455 return res;
456 } else { // ADPCM, PCM
457 if (len <= 0)
458 goto skip;
459 if ((res = av_get_packet(pb, pkt, len)) < 0)
460 return res;
461 }
462 pkt->pos = pos;
463 pkt->stream_index = st->index;
464 return pkt->size;
465 }
466 }
467 } else if (tag == TAG_JPEG2) {
468 for (i=0; i<s->nb_streams; i++) {
469 st = s->streams[i];
470 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
471 break;
472 }
473 if (i == s->nb_streams) {
474 vst = avformat_new_stream(s, NULL);
475 if (!vst)
476 return AVERROR(ENOMEM);
477 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
478 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
479 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
480 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
481 st = vst;
482 }
483 avio_rl16(pb); /* BITMAP_ID */
484 len -= 2;
485 if (len < 4)
486 goto skip;
487 if ((res = av_new_packet(pkt, len)) < 0)
488 return res;
489 if (avio_read(pb, pkt->data, 4) != 4) {
490 av_packet_unref(pkt);
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 av_packet_unref(pkt);
508 return res;
509 }
510 av_shrink_packet(pkt, res);
511 }
512
513 pkt->pos = pos;
514 pkt->stream_index = st->index;
515 return pkt->size;
516 } else {
517 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
518 }
519 skip:
520 if(len<0)
521 av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
522 len = FFMAX(0, len);
523 avio_skip(pb, len);
524 }
525}
526
527#if CONFIG_ZLIB
528static av_cold int swf_read_close(AVFormatContext *avctx)
529{
530 SWFContext *s = avctx->priv_data;
531 inflateEnd(&s->zstream);
532 av_freep(&s->zbuf_in);
533 av_freep(&s->zbuf_out);
534 av_freep(&s->zpb);
535 return 0;
536}
537#endif
538
539AVInputFormat ff_swf_demuxer = {
540 .name = "swf",
541 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
542 .priv_data_size = sizeof(SWFContext),
543 .read_probe = swf_probe,
544 .read_header = swf_read_header,
545 .read_packet = swf_read_packet,
546#if CONFIG_ZLIB
547 .read_close = swf_read_close,
548#endif
549};
550
generated by cgit at 2024-05-18 04:42:26 (GMT)