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2ba45a60 DM |
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 "libavutil/avassert.h" | |
24 | #include "libavutil/channel_layout.h" | |
25 | #include "libavutil/imgutils.h" | |
26 | #include "libavutil/intreadwrite.h" | |
27 | #include "swf.h" | |
28 | ||
29 | static const AVCodecTag swf_audio_codec_tags[] = { | |
30 | { AV_CODEC_ID_PCM_S16LE, 0x00 }, | |
31 | { AV_CODEC_ID_ADPCM_SWF, 0x01 }, | |
32 | { AV_CODEC_ID_MP3, 0x02 }, | |
33 | { AV_CODEC_ID_PCM_S16LE, 0x03 }, | |
34 | // { AV_CODEC_ID_NELLYMOSER, 0x06 }, | |
35 | { AV_CODEC_ID_NONE, 0 }, | |
36 | }; | |
37 | ||
38 | static int get_swf_tag(AVIOContext *pb, int *len_ptr) | |
39 | { | |
40 | int tag, len; | |
41 | ||
42 | if (avio_feof(pb)) | |
43 | return AVERROR_EOF; | |
44 | ||
45 | tag = avio_rl16(pb); | |
46 | len = tag & 0x3f; | |
47 | tag = tag >> 6; | |
48 | if (len == 0x3f) { | |
49 | len = avio_rl32(pb); | |
50 | } | |
51 | *len_ptr = len; | |
52 | return tag; | |
53 | } | |
54 | ||
55 | ||
56 | static int swf_probe(AVProbeData *p) | |
57 | { | |
58 | if(p->buf_size < 15) | |
59 | return 0; | |
60 | ||
61 | /* check file header */ | |
62 | if ( AV_RB24(p->buf) != AV_RB24("CWS") | |
63 | && AV_RB24(p->buf) != AV_RB24("FWS")) | |
64 | return 0; | |
65 | ||
66 | if (p->buf[3] >= 20) | |
67 | return AVPROBE_SCORE_MAX / 4; | |
68 | ||
69 | return AVPROBE_SCORE_MAX; | |
70 | } | |
71 | ||
72 | #if CONFIG_ZLIB | |
73 | static int zlib_refill(void *opaque, uint8_t *buf, int buf_size) | |
74 | { | |
75 | AVFormatContext *s = opaque; | |
76 | SWFContext *swf = s->priv_data; | |
77 | z_stream *z = &swf->zstream; | |
78 | int ret; | |
79 | ||
80 | retry: | |
81 | if (!z->avail_in) { | |
82 | int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE); | |
83 | if (n < 0) | |
84 | return n; | |
85 | z->next_in = swf->zbuf_in; | |
86 | z->avail_in = n; | |
87 | } | |
88 | ||
89 | z->next_out = buf; | |
90 | z->avail_out = buf_size; | |
91 | ||
92 | ret = inflate(z, Z_NO_FLUSH); | |
93 | if (ret < 0) | |
94 | return AVERROR(EINVAL); | |
95 | if (ret == Z_STREAM_END) | |
96 | return AVERROR_EOF; | |
97 | ||
98 | if (buf_size - z->avail_out == 0) | |
99 | goto retry; | |
100 | ||
101 | return buf_size - z->avail_out; | |
102 | } | |
103 | #endif | |
104 | ||
105 | static int swf_read_header(AVFormatContext *s) | |
106 | { | |
107 | SWFContext *swf = s->priv_data; | |
108 | AVIOContext *pb = s->pb; | |
109 | int nbits, len, tag; | |
110 | ||
111 | tag = avio_rb32(pb) & 0xffffff00; | |
112 | avio_rl32(pb); | |
113 | ||
114 | if (tag == MKBETAG('C', 'W', 'S', 0)) { | |
115 | av_log(s, AV_LOG_INFO, "SWF compressed file detected\n"); | |
116 | #if CONFIG_ZLIB | |
117 | swf->zbuf_in = av_malloc(ZBUF_SIZE); | |
118 | swf->zbuf_out = av_malloc(ZBUF_SIZE); | |
119 | swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s, | |
120 | zlib_refill, NULL, NULL); | |
121 | if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb) | |
122 | return AVERROR(ENOMEM); | |
123 | swf->zpb->seekable = 0; | |
124 | if (inflateInit(&swf->zstream) != Z_OK) { | |
125 | av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n"); | |
126 | return AVERROR(EINVAL); | |
127 | } | |
128 | pb = swf->zpb; | |
129 | #else | |
130 | av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n"); | |
131 | return AVERROR(EIO); | |
132 | #endif | |
133 | } else if (tag != MKBETAG('F', 'W', 'S', 0)) | |
134 | return AVERROR(EIO); | |
135 | /* skip rectangle size */ | |
136 | nbits = avio_r8(pb) >> 3; | |
137 | len = (4 * nbits - 3 + 7) / 8; | |
138 | avio_skip(pb, len); | |
139 | swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */ | |
140 | avio_rl16(pb); /* frame count */ | |
141 | ||
142 | swf->samples_per_frame = 0; | |
143 | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info) | |
148 | { | |
149 | int sample_rate_code, sample_size_code; | |
150 | AVStream *ast = avformat_new_stream(s, NULL); | |
151 | if (!ast) | |
152 | return NULL; | |
153 | ast->id = id; | |
154 | if (info & 1) { | |
155 | ast->codec->channels = 2; | |
156 | ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
157 | } else { | |
158 | ast->codec->channels = 1; | |
159 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
160 | } | |
161 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
162 | ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15); | |
163 | ast->need_parsing = AVSTREAM_PARSE_FULL; | |
164 | sample_rate_code = info>>2 & 3; | |
165 | sample_size_code = info>>1 & 1; | |
166 | if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE) | |
167 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; | |
168 | ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); | |
169 | avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); | |
170 | return ast; | |
171 | } | |
172 | ||
173 | static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) | |
174 | { | |
175 | SWFContext *swf = s->priv_data; | |
176 | AVIOContext *pb = s->pb; | |
177 | AVStream *vst = NULL, *ast = NULL, *st = 0; | |
178 | int tag, len, i, frame, v, res; | |
179 | ||
180 | #if CONFIG_ZLIB | |
181 | if (swf->zpb) | |
182 | pb = swf->zpb; | |
183 | #endif | |
184 | ||
185 | for(;;) { | |
186 | uint64_t pos = avio_tell(pb); | |
187 | tag = get_swf_tag(pb, &len); | |
188 | if (tag < 0) | |
189 | return tag; | |
190 | if (len < 0) { | |
191 | av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len); | |
192 | return AVERROR_INVALIDDATA; | |
193 | } | |
194 | if (tag == TAG_VIDEOSTREAM) { | |
195 | int ch_id = avio_rl16(pb); | |
196 | len -= 2; | |
197 | ||
198 | for (i=0; i<s->nb_streams; i++) { | |
199 | st = s->streams[i]; | |
200 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) | |
201 | goto skip; | |
202 | } | |
203 | ||
204 | avio_rl16(pb); | |
205 | avio_rl16(pb); | |
206 | avio_rl16(pb); | |
207 | avio_r8(pb); | |
208 | /* Check for FLV1 */ | |
209 | vst = avformat_new_stream(s, NULL); | |
210 | if (!vst) | |
211 | return AVERROR(ENOMEM); | |
212 | vst->id = ch_id; | |
213 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
214 | vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb)); | |
215 | avpriv_set_pts_info(vst, 16, 256, swf->frame_rate); | |
216 | len -= 8; | |
217 | } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) { | |
218 | /* streaming found */ | |
219 | ||
220 | for (i=0; i<s->nb_streams; i++) { | |
221 | st = s->streams[i]; | |
222 | if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) | |
223 | goto skip; | |
224 | } | |
225 | ||
226 | avio_r8(pb); | |
227 | v = avio_r8(pb); | |
228 | swf->samples_per_frame = avio_rl16(pb); | |
229 | ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */ | |
230 | if (!ast) | |
231 | return AVERROR(ENOMEM); | |
232 | len -= 4; | |
233 | } else if (tag == TAG_DEFINESOUND) { | |
234 | /* audio stream */ | |
235 | int ch_id = avio_rl16(pb); | |
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 == ch_id) | |
240 | goto skip; | |
241 | } | |
242 | ||
243 | // FIXME: The entire audio stream is stored in a single chunk/tag. Normally, | |
244 | // these are smaller audio streams in DEFINESOUND tags, but it's technically | |
245 | // possible they could be huge. Break it up into multiple packets if it's big. | |
246 | v = avio_r8(pb); | |
247 | ast = create_new_audio_stream(s, ch_id, v); | |
248 | if (!ast) | |
249 | return AVERROR(ENOMEM); | |
250 | ast->duration = avio_rl32(pb); // number of samples | |
251 | if (((v>>4) & 15) == 2) { // MP3 sound data record | |
252 | ast->skip_samples = avio_rl16(pb); | |
253 | len -= 2; | |
254 | } | |
255 | len -= 7; | |
256 | if ((res = av_get_packet(pb, pkt, len)) < 0) | |
257 | return res; | |
258 | pkt->pos = pos; | |
259 | pkt->stream_index = ast->index; | |
260 | return pkt->size; | |
261 | } else if (tag == TAG_VIDEOFRAME) { | |
262 | int ch_id = avio_rl16(pb); | |
263 | len -= 2; | |
264 | for(i=0; i<s->nb_streams; i++) { | |
265 | st = s->streams[i]; | |
266 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) { | |
267 | frame = avio_rl16(pb); | |
268 | len -= 2; | |
269 | if (len <= 0) | |
270 | goto skip; | |
271 | if ((res = av_get_packet(pb, pkt, len)) < 0) | |
272 | return res; | |
273 | pkt->pos = pos; | |
274 | pkt->pts = frame; | |
275 | pkt->stream_index = st->index; | |
276 | return pkt->size; | |
277 | } | |
278 | } | |
279 | } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) { | |
280 | #if CONFIG_ZLIB | |
281 | long out_len; | |
282 | uint8_t *buf = NULL, *zbuf = NULL, *pal; | |
283 | uint32_t colormap[AVPALETTE_COUNT] = {0}; | |
284 | const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2; | |
285 | const int colormapbpp = 3 + alpha_bmp; | |
286 | int linesize, colormapsize = 0; | |
287 | ||
288 | const int ch_id = avio_rl16(pb); | |
289 | const int bmp_fmt = avio_r8(pb); | |
290 | const int width = avio_rl16(pb); | |
291 | const int height = avio_rl16(pb); | |
292 | int pix_fmt; | |
293 | ||
294 | len -= 2+1+2+2; | |
295 | ||
296 | switch (bmp_fmt) { | |
297 | case 3: // PAL-8 | |
298 | linesize = width; | |
299 | colormapsize = avio_r8(pb) + 1; | |
300 | len--; | |
301 | break; | |
302 | case 4: // RGB15 | |
303 | linesize = width * 2; | |
304 | break; | |
305 | case 5: // RGB24 (0RGB) | |
306 | linesize = width * 4; | |
307 | break; | |
308 | default: | |
309 | av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt); | |
310 | goto bitmap_end_skip; | |
311 | } | |
312 | ||
313 | linesize = FFALIGN(linesize, 4); | |
314 | ||
315 | if (av_image_check_size(width, height, 0, s) < 0 || | |
316 | linesize >= INT_MAX / height || | |
317 | linesize * height >= INT_MAX - colormapsize * colormapbpp) { | |
318 | av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height); | |
319 | goto bitmap_end_skip; | |
320 | } | |
321 | ||
322 | out_len = colormapsize * colormapbpp + linesize * height; | |
323 | ||
324 | av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n", | |
325 | ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize); | |
326 | ||
327 | zbuf = av_malloc(len); | |
328 | buf = av_malloc(out_len); | |
329 | if (!zbuf || !buf) { | |
330 | res = AVERROR(ENOMEM); | |
331 | goto bitmap_end; | |
332 | } | |
333 | ||
334 | len = avio_read(pb, zbuf, len); | |
335 | if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) { | |
336 | av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n"); | |
337 | goto bitmap_end_skip; | |
338 | } | |
339 | ||
340 | for (i = 0; i < s->nb_streams; i++) { | |
341 | st = s->streams[i]; | |
342 | if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3) | |
343 | break; | |
344 | } | |
345 | if (i == s->nb_streams) { | |
346 | vst = avformat_new_stream(s, NULL); | |
347 | if (!vst) { | |
348 | res = AVERROR(ENOMEM); | |
349 | goto bitmap_end; | |
350 | } | |
351 | vst->id = -3; /* -3 to avoid clash with video stream and audio stream */ | |
352 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
353 | vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO; | |
354 | avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); | |
355 | st = vst; | |
356 | } | |
357 | ||
358 | if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0) | |
359 | goto bitmap_end; | |
360 | if (!st->codec->width && !st->codec->height) { | |
361 | st->codec->width = width; | |
362 | st->codec->height = height; | |
363 | } else { | |
364 | ff_add_param_change(pkt, 0, 0, 0, width, height); | |
365 | } | |
366 | pkt->pos = pos; | |
367 | pkt->stream_index = st->index; | |
368 | ||
369 | switch (bmp_fmt) { | |
370 | case 3: | |
371 | pix_fmt = AV_PIX_FMT_PAL8; | |
372 | for (i = 0; i < colormapsize; i++) | |
373 | if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i); | |
374 | else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i); | |
375 | pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); | |
376 | if (!pal) { | |
377 | res = AVERROR(ENOMEM); | |
378 | goto bitmap_end; | |
379 | } | |
380 | memcpy(pal, colormap, AVPALETTE_SIZE); | |
381 | break; | |
382 | case 4: | |
383 | pix_fmt = AV_PIX_FMT_RGB555; | |
384 | break; | |
385 | case 5: | |
386 | pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB; | |
387 | break; | |
388 | default: | |
389 | av_assert0(0); | |
390 | } | |
391 | if (st->codec->pix_fmt != AV_PIX_FMT_NONE && st->codec->pix_fmt != pix_fmt) { | |
392 | av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n"); | |
393 | res = AVERROR_PATCHWELCOME; | |
394 | goto bitmap_end; | |
395 | } | |
396 | st->codec->pix_fmt = pix_fmt; | |
397 | ||
398 | if (linesize * height > pkt->size) { | |
399 | res = AVERROR_INVALIDDATA; | |
400 | goto bitmap_end; | |
401 | } | |
402 | memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height); | |
403 | ||
404 | res = pkt->size; | |
405 | ||
406 | bitmap_end: | |
407 | av_freep(&zbuf); | |
408 | av_freep(&buf); | |
409 | return res; | |
410 | bitmap_end_skip: | |
411 | av_freep(&zbuf); | |
412 | av_freep(&buf); | |
413 | #else | |
414 | av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n"); | |
415 | #endif | |
416 | } else if (tag == TAG_STREAMBLOCK) { | |
417 | for (i = 0; i < s->nb_streams; i++) { | |
418 | st = s->streams[i]; | |
419 | if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) { | |
420 | if (st->codec->codec_id == AV_CODEC_ID_MP3) { | |
421 | avio_skip(pb, 4); | |
422 | len -= 4; | |
423 | if (len <= 0) | |
424 | goto skip; | |
425 | if ((res = av_get_packet(pb, pkt, len)) < 0) | |
426 | return res; | |
427 | } else { // ADPCM, PCM | |
428 | if (len <= 0) | |
429 | goto skip; | |
430 | if ((res = av_get_packet(pb, pkt, len)) < 0) | |
431 | return res; | |
432 | } | |
433 | pkt->pos = pos; | |
434 | pkt->stream_index = st->index; | |
435 | return pkt->size; | |
436 | } | |
437 | } | |
438 | } else if (tag == TAG_JPEG2) { | |
439 | for (i=0; i<s->nb_streams; i++) { | |
440 | st = s->streams[i]; | |
441 | if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2) | |
442 | break; | |
443 | } | |
444 | if (i == s->nb_streams) { | |
445 | vst = avformat_new_stream(s, NULL); | |
446 | if (!vst) | |
447 | return AVERROR(ENOMEM); | |
448 | vst->id = -2; /* -2 to avoid clash with video stream and audio stream */ | |
449 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
450 | vst->codec->codec_id = AV_CODEC_ID_MJPEG; | |
451 | avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); | |
452 | st = vst; | |
453 | } | |
454 | avio_rl16(pb); /* BITMAP_ID */ | |
455 | len -= 2; | |
456 | if (len < 4) | |
457 | goto skip; | |
458 | if ((res = av_new_packet(pkt, len)) < 0) | |
459 | return res; | |
460 | if (avio_read(pb, pkt->data, 4) != 4) { | |
461 | av_free_packet(pkt); | |
462 | return AVERROR_INVALIDDATA; | |
463 | } | |
464 | if (AV_RB32(pkt->data) == 0xffd8ffd9 || | |
465 | AV_RB32(pkt->data) == 0xffd9ffd8) { | |
466 | /* old SWF files containing SOI/EOI as data start */ | |
467 | /* files created by swink have reversed tag */ | |
468 | pkt->size -= 4; | |
469 | memset(pkt->data+pkt->size, 0, 4); | |
470 | res = avio_read(pb, pkt->data, pkt->size); | |
471 | } else { | |
472 | res = avio_read(pb, pkt->data + 4, pkt->size - 4); | |
473 | if (res >= 0) | |
474 | res += 4; | |
475 | } | |
476 | if (res != pkt->size) { | |
477 | if (res < 0) { | |
478 | av_free_packet(pkt); | |
479 | return res; | |
480 | } | |
481 | av_shrink_packet(pkt, res); | |
482 | } | |
483 | ||
484 | pkt->pos = pos; | |
485 | pkt->stream_index = st->index; | |
486 | return pkt->size; | |
487 | } else { | |
488 | av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag); | |
489 | } | |
490 | skip: | |
491 | if(len<0) | |
492 | av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len); | |
493 | len = FFMAX(0, len); | |
494 | avio_skip(pb, len); | |
495 | } | |
496 | } | |
497 | ||
498 | #if CONFIG_ZLIB | |
499 | static av_cold int swf_read_close(AVFormatContext *avctx) | |
500 | { | |
501 | SWFContext *s = avctx->priv_data; | |
502 | inflateEnd(&s->zstream); | |
503 | av_freep(&s->zbuf_in); | |
504 | av_freep(&s->zbuf_out); | |
505 | av_freep(&s->zpb); | |
506 | return 0; | |
507 | } | |
508 | #endif | |
509 | ||
510 | AVInputFormat ff_swf_demuxer = { | |
511 | .name = "swf", | |
512 | .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), | |
513 | .priv_data_size = sizeof(SWFContext), | |
514 | .read_probe = swf_probe, | |
515 | .read_header = swf_read_header, | |
516 | .read_packet = swf_read_packet, | |
517 | #if CONFIG_ZLIB | |
518 | .read_close = swf_read_close, | |
519 | #endif | |
520 | }; |