FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/swfdec.c
Date: 2024-04-23 16:28:37
Exec Total Coverage
Lines: 104 360 28.9%
Functions: 5 7 71.4%
Branches: 47 224 21.0%
Line Branch Exec Source
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 "libavutil/mem.h"
35 #include "libavcodec/get_bits.h"
36 #include "demux.h"
37 #include "swf.h"
38 #include "flv.h"
39
40 typedef struct SWFDecContext {
41 int samples_per_frame;
42 int frame_rate;
43 #if CONFIG_ZLIB
44 #define ZBUF_SIZE 4096
45 AVIOContext *zpb;
46 uint8_t *zbuf_in;
47 uint8_t *zbuf_out;
48 z_stream zstream;
49 #endif
50 } SWFDecContext;
51
52 static const AVCodecTag swf_audio_codec_tags[] = {
53 { AV_CODEC_ID_PCM_S16LE, 0x00 },
54 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
55 { AV_CODEC_ID_MP3, 0x02 },
56 { AV_CODEC_ID_PCM_S16LE, 0x03 },
57 { AV_CODEC_ID_NELLYMOSER, 0x06 },
58 { AV_CODEC_ID_NONE, 0 },
59 };
60
61 2213 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
62 {
63 int tag, len;
64
65
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 2213 if (avio_feof(pb))
66 29 return AVERROR_EOF;
67
68 2184 tag = avio_rl16(pb);
69 2184 len = tag & 0x3f;
70 2184 tag = tag >> 6;
71
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 2184 if (len == 0x3f) {
72 700 len = avio_rl32(pb);
73 }
74 2184 *len_ptr = len;
75 2184 return tag;
76 }
77
78
79 7125 static int swf_probe(const AVProbeData *p)
80 {
81 GetBitContext gb;
82 int len, xmin, xmax, ymin, ymax;
83
84
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 7125 if(p->buf_size < 15)
85 ✗ return 0;
86
87 /* check file header */
88
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 7125 if ( AV_RB24(p->buf) != AV_RB24("CWS")
89
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 7125 && AV_RB24(p->buf) != AV_RB24("FWS"))
90 7123 return 0;
91
92
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 2 if ( AV_RB24(p->buf) == AV_RB24("CWS")
93 ✗ && p->buf[3] <= 20)
94 ✗ return AVPROBE_SCORE_MAX / 4 + 1;
95
96
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 2 if (init_get_bits8(&gb, p->buf + 8, p->buf_size - 8) < 0)
97 ✗ return 0;
98
99 2 len = get_bits(&gb, 5);
100
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 2 if (!len)
101 ✗ return 0;
102 2 xmin = get_bits_long(&gb, len);
103 2 xmax = get_bits_long(&gb, len);
104 2 ymin = get_bits_long(&gb, len);
105 2 ymax = get_bits_long(&gb, len);
106
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 2 if (xmin || ymin || !xmax || !ymax)
107 ✗ return 0;
108
109
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 2 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
110 ✗ return AVPROBE_SCORE_MAX / 4;
111
112 2 return AVPROBE_SCORE_EXTENSION + 1;
113 }
114
115 #if CONFIG_ZLIB
116 ✗ static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
117 {
118 ✗ AVFormatContext *s = opaque;
119 ✗ SWFDecContext *swf = s->priv_data;
120 ✗ z_stream *z = &swf->zstream;
121 int ret;
122
123 ✗ retry:
124 ✗ if (!z->avail_in) {
125 ✗ int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
126 ✗ if (n < 0)
127 ✗ return n;
128 ✗ z->next_in = swf->zbuf_in;
129 ✗ z->avail_in = n;
130 }
131
132 ✗ z->next_out = buf;
133 ✗ z->avail_out = buf_size;
134
135 ✗ ret = inflate(z, Z_NO_FLUSH);
136 ✗ if (ret == Z_STREAM_END)
137 ✗ return AVERROR_EOF;
138 ✗ if (ret != Z_OK)
139 ✗ return AVERROR(EINVAL);
140
141 ✗ if (buf_size - z->avail_out == 0)
142 ✗ goto retry;
143
144 ✗ return buf_size - z->avail_out;
145 }
146
147 static av_cold int swf_read_close(AVFormatContext *avctx);
148 #endif
149
150 2 static int swf_read_header(AVFormatContext *s)
151 {
152 2 SWFDecContext *swf = s->priv_data;
153 2 AVIOContext *pb = s->pb;
154 int nbits, len, tag;
155
156 2 tag = avio_rb32(pb) & 0xffffff00;
157 2 avio_rl32(pb);
158
159
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 2 if (tag == MKBETAG('C', 'W', 'S', 0)) {
160 ✗ av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
161 #if CONFIG_ZLIB
162 ✗ if (inflateInit(&swf->zstream) != Z_OK) {
163 ✗ av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
164 ✗ return AVERROR(EINVAL);
165 }
166 ✗ if (!(swf->zbuf_in = av_malloc(ZBUF_SIZE)) ||
167 ✗ !(swf->zbuf_out = av_malloc(ZBUF_SIZE)) ||
168 ✗ !(swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0,
169 s, zlib_refill, NULL, NULL))) {
170 ✗ swf_read_close(s);
171 ✗ return AVERROR(ENOMEM);
172 }
173 ✗ swf->zpb->seekable = 0;
174 ✗ pb = swf->zpb;
175 #else
176 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
177 return AVERROR(EIO);
178 #endif
179
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 2 } else if (tag != MKBETAG('F', 'W', 'S', 0))
180 ✗ return AVERROR(EIO);
181 /* skip rectangle size */
182 2 nbits = avio_r8(pb) >> 3;
183 2 len = (4 * nbits - 3 + 7) / 8;
184 2 avio_skip(pb, len);
185 2 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
186 2 avio_rl16(pb); /* frame count */
187
188 2 swf->samples_per_frame = 0;
189 2 s->ctx_flags |= AVFMTCTX_NOHEADER;
190 2 return 0;
191 }
192
193 ✗ static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
194 {
195 int sample_rate_code, sample_size_code;
196 ✗ AVStream *ast = avformat_new_stream(s, NULL);
197 ✗ if (!ast)
198 ✗ return NULL;
199 ✗ ast->id = id;
200 ✗ av_channel_layout_default(&ast->codecpar->ch_layout, 1 + (info & 1));
201 ✗ ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
202 ✗ ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
203 ✗ ffstream(ast)->need_parsing = AVSTREAM_PARSE_FULL;
204 ✗ sample_rate_code = info>>2 & 3;
205 ✗ sample_size_code = info>>1 & 1;
206 ✗ if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
207 ✗ ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
208 ✗ ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
209 ✗ avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
210 ✗ return ast;
211 }
212
213 729 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
214 {
215 729 SWFDecContext *swf = s->priv_data;
216 729 AVIOContext *pb = s->pb;
217 729 AVStream *vst = NULL, *ast = NULL, *st = 0;
218 int tag, len, i, frame, v, res;
219
220 #if CONFIG_ZLIB
221
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 729 if (swf->zpb)
222 ✗ pb = swf->zpb;
223 #endif
224
225 1484 for(;;) {
226 2213 uint64_t pos = avio_tell(pb);
227 2213 tag = get_swf_tag(pb, &len);
228
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 2213 if (tag < 0)
229 29 return tag;
230
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 2184 if (len < 0) {
231 ✗ av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
232 ✗ return AVERROR_INVALIDDATA;
233 }
234
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 2184 if (tag == TAG_VIDEOSTREAM) {
235 28 int ch_id = avio_rl16(pb);
236 28 len -= 2;
237
238
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 28 for (i=0; i<s->nb_streams; i++) {
239 26 st = s->streams[i];
240
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 26 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
241 26 goto skip;
242 }
243
244 2 avio_rl16(pb);
245 2 avio_rl16(pb);
246 2 avio_rl16(pb);
247 2 avio_r8(pb);
248 /* Check for FLV1 */
249 2 vst = avformat_new_stream(s, NULL);
250
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 2 if (!vst)
251 ✗ return AVERROR(ENOMEM);
252 2 vst->id = ch_id;
253 2 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
254 2 vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
255 2 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
256 2 len -= 8;
257
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 2156 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
258 /* streaming found */
259
260 ✗ for (i=0; i<s->nb_streams; i++) {
261 ✗ st = s->streams[i];
262 ✗ if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
263 ✗ goto skip;
264 }
265
266 ✗ avio_r8(pb);
267 ✗ v = avio_r8(pb);
268 ✗ swf->samples_per_frame = avio_rl16(pb);
269 ✗ ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
270 ✗ if (!ast)
271 ✗ return AVERROR(ENOMEM);
272 ✗ len -= 4;
273
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 2156 } else if (tag == TAG_DEFINESOUND) {
274 /* audio stream */
275 ✗ int ch_id = avio_rl16(pb);
276
277 ✗ for (i=0; i<s->nb_streams; i++) {
278 ✗ st = s->streams[i];
279 ✗ if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
280 ✗ goto skip;
281 }
282
283 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
284 // these are smaller audio streams in DEFINESOUND tags, but it's technically
285 // possible they could be huge. Break it up into multiple packets if it's big.
286 ✗ v = avio_r8(pb);
287 ✗ ast = create_new_audio_stream(s, ch_id, v);
288 ✗ if (!ast)
289 ✗ return AVERROR(ENOMEM);
290 ✗ ast->duration = avio_rl32(pb); // number of samples
291 ✗ if (((v>>4) & 15) == 2) { // MP3 sound data record
292 ✗ ffstream(ast)->skip_samples = avio_rl16(pb);
293 ✗ len -= 2;
294 }
295 ✗ len -= 7;
296 ✗ if ((res = av_get_packet(pb, pkt, len)) < 0)
297 ✗ return res;
298 ✗ pkt->pos = pos;
299 ✗ pkt->stream_index = ast->index;
300 ✗ return pkt->size;
301
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 2156 } else if (tag == TAG_VIDEOFRAME) {
302 700 int ch_id = avio_rl16(pb);
303 700 len -= 2;
304
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 700 for(i=0; i<s->nb_streams; i++) {
305 700 st = s->streams[i];
306
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 700 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
307 700 int pkt_flags = 0;
308 700 frame = avio_rl16(pb);
309 700 len -= 2;
310
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 700 if (len <= 0)
311 ✗ goto skip;
312
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 700 if (st->codecpar->codec_id == AV_CODEC_ID_FLASHSV) {
313 ✗ unsigned flags = avio_r8(pb);
314 ✗ len--;
315 ✗ if (len <= 0)
316 ✗ goto skip;
317 ✗ pkt_flags |= (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ? AV_PKT_FLAG_KEY : 0;
318 }
319
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 700 if ((res = av_get_packet(pb, pkt, len)) < 0)
320 ✗ return res;
321 700 pkt->pos = pos;
322 700 pkt->pts = frame;
323 700 pkt->stream_index = st->index;
324 700 pkt->flags |= pkt_flags;
325 700 return pkt->size;
326 }
327 }
328
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 1456 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
329 #if CONFIG_ZLIB
330 long out_len;
331 ✗ uint8_t *buf = NULL, *zbuf = NULL, *pal;
332 ✗ uint32_t colormap[AVPALETTE_COUNT] = {0};
333 ✗ const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
334 ✗ const int colormapbpp = 3 + alpha_bmp;
335 ✗ int linesize, colormapsize = 0;
336
337 ✗ const int ch_id = avio_rl16(pb);
338 ✗ const int bmp_fmt = avio_r8(pb);
339 ✗ const int width = avio_rl16(pb);
340 ✗ const int height = avio_rl16(pb);
341 int pix_fmt;
342
343 ✗ len -= 2+1+2+2;
344
345 ✗ switch (bmp_fmt) {
346 ✗ case 3: // PAL-8
347 ✗ linesize = width;
348 ✗ colormapsize = avio_r8(pb) + 1;
349 ✗ len--;
350 ✗ break;
351 ✗ case 4: // RGB15
352 ✗ linesize = width * 2;
353 ✗ break;
354 ✗ case 5: // RGB24 (0RGB)
355 ✗ linesize = width * 4;
356 ✗ break;
357 ✗ default:
358 ✗ av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
359 ✗ goto bitmap_end_skip;
360 }
361
362 ✗ linesize = FFALIGN(linesize, 4);
363
364 ✗ if (av_image_check_size(width, height, 0, s) < 0 ||
365 ✗ linesize >= INT_MAX / height ||
366 ✗ linesize * height >= INT_MAX - colormapsize * colormapbpp) {
367 ✗ av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
368 ✗ goto bitmap_end_skip;
369 }
370
371 ✗ out_len = colormapsize * colormapbpp + linesize * height;
372
373 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
374 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
375
376 ✗ if (len * 17373LL < out_len)
377 ✗ goto bitmap_end_skip;
378
379 ✗ zbuf = av_malloc(len);
380 ✗ if (!zbuf) {
381 ✗ res = AVERROR(ENOMEM);
382 ✗ goto bitmap_end;
383 }
384
385 ✗ len = avio_read(pb, zbuf, len);
386 ✗ if (len < 0)
387 ✗ goto bitmap_end_skip;
388
389 ✗ buf = av_malloc(out_len);
390 ✗ if (!buf) {
391 ✗ res = AVERROR(ENOMEM);
392 ✗ goto bitmap_end;
393 }
394 ✗ if ((res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
395 ✗ av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
396 ✗ goto bitmap_end_skip;
397 }
398
399 ✗ for (i = 0; i < s->nb_streams; i++) {
400 ✗ st = s->streams[i];
401 ✗ if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
402 ✗ break;
403 }
404 ✗ if (i == s->nb_streams) {
405 ✗ vst = avformat_new_stream(s, NULL);
406 ✗ if (!vst) {
407 ✗ res = AVERROR(ENOMEM);
408 ✗ goto bitmap_end;
409 }
410 ✗ vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
411 ✗ vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
412 ✗ vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
413 ✗ avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
414 ✗ st = vst;
415 }
416
417 ✗ if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
418 ✗ goto bitmap_end;
419 ✗ if (!st->codecpar->width && !st->codecpar->height) {
420 ✗ st->codecpar->width = width;
421 ✗ st->codecpar->height = height;
422 } else {
423 ✗ ff_add_param_change(pkt, 0, 0, 0, width, height);
424 }
425 ✗ pkt->pos = pos;
426 ✗ pkt->stream_index = st->index;
427
428 ✗ if (linesize * height > pkt->size) {
429 ✗ res = AVERROR_INVALIDDATA;
430 ✗ goto bitmap_end;
431 }
432
433 ✗ switch (bmp_fmt) {
434 ✗ case 3:
435 ✗ pix_fmt = AV_PIX_FMT_PAL8;
436 ✗ for (i = 0; i < colormapsize; i++)
437 ✗ if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
438 ✗ else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
439 ✗ pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
440 ✗ if (!pal) {
441 ✗ res = AVERROR(ENOMEM);
442 ✗ goto bitmap_end;
443 }
444 ✗ memcpy(pal, colormap, AVPALETTE_SIZE);
445 ✗ break;
446 ✗ case 4:
447 ✗ pix_fmt = AV_PIX_FMT_RGB555;
448 ✗ break;
449 ✗ case 5:
450 ✗ pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
451 ✗ break;
452 ✗ default:
453 ✗ av_assert0(0);
454 }
455 ✗ if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
456 ✗ av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
457 } else
458 ✗ st->codecpar->format = pix_fmt;
459
460 ✗ memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
461
462 ✗ res = pkt->size;
463
464 ✗ bitmap_end:
465 ✗ av_freep(&zbuf);
466 ✗ av_freep(&buf);
467 ✗ return res;
468 ✗ bitmap_end_skip:
469 ✗ av_freep(&zbuf);
470 ✗ av_freep(&buf);
471 #else
472 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
473 #endif
474
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 1456 } else if (tag == TAG_STREAMBLOCK) {
475 ✗ for (i = 0; i < s->nb_streams; i++) {
476 ✗ st = s->streams[i];
477 ✗ if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
478 ✗ if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
479 ✗ avio_skip(pb, 4);
480 ✗ len -= 4;
481 ✗ if (len <= 0)
482 ✗ goto skip;
483 ✗ if ((res = av_get_packet(pb, pkt, len)) < 0)
484 ✗ return res;
485 } else { // ADPCM, PCM
486 ✗ if (len <= 0)
487 ✗ goto skip;
488 ✗ if ((res = av_get_packet(pb, pkt, len)) < 0)
489 ✗ return res;
490 }
491 ✗ pkt->pos = pos;
492 ✗ pkt->stream_index = st->index;
493 ✗ return pkt->size;
494 }
495 }
496
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 1456 } else if (tag == TAG_JPEG2) {
497 ✗ for (i=0; i<s->nb_streams; i++) {
498 ✗ st = s->streams[i];
499 ✗ if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
500 ✗ break;
501 }
502 ✗ if (i == s->nb_streams) {
503 ✗ vst = avformat_new_stream(s, NULL);
504 ✗ if (!vst)
505 ✗ return AVERROR(ENOMEM);
506 ✗ vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
507 ✗ vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
508 ✗ vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
509 ✗ avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
510 ✗ st = vst;
511 }
512 ✗ avio_rl16(pb); /* BITMAP_ID */
513 ✗ len -= 2;
514 ✗ if (len < 4)
515 ✗ goto skip;
516 ✗ if ((res = av_new_packet(pkt, len)) < 0)
517 ✗ return res;
518 ✗ if (avio_read(pb, pkt->data, 4) != 4) {
519 ✗ return AVERROR_INVALIDDATA;
520 }
521 ✗ if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
522 ✗ AV_RB32(pkt->data) == 0xffd9ffd8) {
523 /* old SWF files containing SOI/EOI as data start */
524 /* files created by swink have reversed tag */
525 ✗ pkt->size -= 4;
526 ✗ memset(pkt->data+pkt->size, 0, 4);
527 ✗ res = avio_read(pb, pkt->data, pkt->size);
528 } else {
529 ✗ res = avio_read(pb, pkt->data + 4, pkt->size - 4);
530 ✗ if (res >= 0)
531 ✗ res += 4;
532 }
533 ✗ if (res != pkt->size) {
534 ✗ if (res < 0) {
535 ✗ return res;
536 }
537 ✗ av_shrink_packet(pkt, res);
538 }
539
540 ✗ pkt->pos = pos;
541 ✗ pkt->stream_index = st->index;
542 ✗ return pkt->size;
543 } else {
544 1456 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
545 }
546 1484 skip:
547
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 1484 if(len<0)
548 ✗ av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
549 1484 len = FFMAX(0, len);
550 1484 avio_skip(pb, len);
551 }
552 }
553
554 #if CONFIG_ZLIB
555 2 static av_cold int swf_read_close(AVFormatContext *avctx)
556 {
557 2 SWFDecContext *s = avctx->priv_data;
558 2 inflateEnd(&s->zstream);
559 2 av_freep(&s->zbuf_in);
560 2 av_freep(&s->zbuf_out);
561 2 avio_context_free(&s->zpb);
562 2 return 0;
563 }
564 #endif
565
566 const FFInputFormat ff_swf_demuxer = {
567 .p.name = "swf",
568 .p.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
569 .priv_data_size = sizeof(SWFDecContext),
570 .read_probe = swf_probe,
571 .read_header = swf_read_header,
572 .read_packet = swf_read_packet,
573 #if CONFIG_ZLIB
574 .read_close = swf_read_close,
575 #endif
576 };
577