2 * Flash Compatible Streaming Format demuxer
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2003 Tinic Uro
6 * This file is part of FFmpeg.
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.
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.
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
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"
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 },
39 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
57 static int swf_probe(AVProbeData *p)
60 int len, xmin, xmax, ymin, ymax;
65 /* check file header */
66 if ( AV_RB24(p->buf) != AV_RB24("CWS")
67 && AV_RB24(p->buf) != AV_RB24("FWS"))
70 if ( AV_RB24(p->buf) == AV_RB24("CWS")
72 return AVPROBE_SCORE_MAX / 4 + 1;
74 init_get_bits8(&gb, p->buf + 3, p->buf_size - 3);
77 len = get_bits(&gb, 5);
80 xmin = get_bits_long(&gb, len);
81 xmax = get_bits_long(&gb, len);
82 ymin = get_bits_long(&gb, len);
83 ymax = get_bits_long(&gb, len);
84 if (xmin || ymin || !xmax || !ymax)
87 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
88 return AVPROBE_SCORE_MAX / 4;
90 return AVPROBE_SCORE_MAX;
94 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
96 AVFormatContext *s = opaque;
97 SWFContext *swf = s->priv_data;
98 z_stream *z = &swf->zstream;
103 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
106 z->next_in = swf->zbuf_in;
111 z->avail_out = buf_size;
113 ret = inflate(z, Z_NO_FLUSH);
115 return AVERROR(EINVAL);
116 if (ret == Z_STREAM_END)
119 if (buf_size - z->avail_out == 0)
122 return buf_size - z->avail_out;
126 static int swf_read_header(AVFormatContext *s)
128 SWFContext *swf = s->priv_data;
129 AVIOContext *pb = s->pb;
132 tag = avio_rb32(pb) & 0xffffff00;
135 if (tag == MKBETAG('C', 'W', 'S', 0)) {
136 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
138 swf->zbuf_in = av_malloc(ZBUF_SIZE);
139 swf->zbuf_out = av_malloc(ZBUF_SIZE);
140 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
141 zlib_refill, NULL, NULL);
142 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
143 return AVERROR(ENOMEM);
144 swf->zpb->seekable = 0;
145 if (inflateInit(&swf->zstream) != Z_OK) {
146 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
147 return AVERROR(EINVAL);
151 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
154 } else if (tag != MKBETAG('F', 'W', 'S', 0))
156 /* skip rectangle size */
157 nbits = avio_r8(pb) >> 3;
158 len = (4 * nbits - 3 + 7) / 8;
160 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
161 avio_rl16(pb); /* frame count */
163 swf->samples_per_frame = 0;
164 s->ctx_flags |= AVFMTCTX_NOHEADER;
168 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
170 int sample_rate_code, sample_size_code;
171 AVStream *ast = avformat_new_stream(s, NULL);
176 ast->codec->channels = 2;
177 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
179 ast->codec->channels = 1;
180 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
182 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
183 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
184 ast->need_parsing = AVSTREAM_PARSE_FULL;
185 sample_rate_code = info>>2 & 3;
186 sample_size_code = info>>1 & 1;
187 if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE)
188 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
189 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
190 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
194 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
196 SWFContext *swf = s->priv_data;
197 AVIOContext *pb = s->pb;
198 AVStream *vst = NULL, *ast = NULL, *st = 0;
199 int tag, len, i, frame, v, res;
207 uint64_t pos = avio_tell(pb);
208 tag = get_swf_tag(pb, &len);
212 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
213 return AVERROR_INVALIDDATA;
215 if (tag == TAG_VIDEOSTREAM) {
216 int ch_id = avio_rl16(pb);
219 for (i=0; i<s->nb_streams; i++) {
221 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
230 vst = avformat_new_stream(s, NULL);
232 return AVERROR(ENOMEM);
234 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
235 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
236 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
238 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
239 /* streaming found */
241 for (i=0; i<s->nb_streams; i++) {
243 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
249 swf->samples_per_frame = avio_rl16(pb);
250 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
252 return AVERROR(ENOMEM);
254 } else if (tag == TAG_DEFINESOUND) {
256 int ch_id = avio_rl16(pb);
258 for (i=0; i<s->nb_streams; i++) {
260 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
264 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
265 // these are smaller audio streams in DEFINESOUND tags, but it's technically
266 // possible they could be huge. Break it up into multiple packets if it's big.
268 ast = create_new_audio_stream(s, ch_id, v);
270 return AVERROR(ENOMEM);
271 ast->duration = avio_rl32(pb); // number of samples
272 if (((v>>4) & 15) == 2) { // MP3 sound data record
273 ast->skip_samples = avio_rl16(pb);
277 if ((res = av_get_packet(pb, pkt, len)) < 0)
280 pkt->stream_index = ast->index;
282 } else if (tag == TAG_VIDEOFRAME) {
283 int ch_id = avio_rl16(pb);
285 for(i=0; i<s->nb_streams; i++) {
287 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
288 frame = avio_rl16(pb);
292 if ((res = av_get_packet(pb, pkt, len)) < 0)
296 pkt->stream_index = st->index;
300 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
303 uint8_t *buf = NULL, *zbuf = NULL, *pal;
304 uint32_t colormap[AVPALETTE_COUNT] = {0};
305 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
306 const int colormapbpp = 3 + alpha_bmp;
307 int linesize, colormapsize = 0;
309 const int ch_id = avio_rl16(pb);
310 const int bmp_fmt = avio_r8(pb);
311 const int width = avio_rl16(pb);
312 const int height = avio_rl16(pb);
320 colormapsize = avio_r8(pb) + 1;
324 linesize = width * 2;
326 case 5: // RGB24 (0RGB)
327 linesize = width * 4;
330 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
331 goto bitmap_end_skip;
334 linesize = FFALIGN(linesize, 4);
336 if (av_image_check_size(width, height, 0, s) < 0 ||
337 linesize >= INT_MAX / height ||
338 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
339 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
340 goto bitmap_end_skip;
343 out_len = colormapsize * colormapbpp + linesize * height;
345 av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
346 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
348 zbuf = av_malloc(len);
349 buf = av_malloc(out_len);
351 res = AVERROR(ENOMEM);
355 len = avio_read(pb, zbuf, len);
356 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
357 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
358 goto bitmap_end_skip;
361 for (i = 0; i < s->nb_streams; i++) {
363 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
366 if (i == s->nb_streams) {
367 vst = avformat_new_stream(s, NULL);
369 res = AVERROR(ENOMEM);
372 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
373 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
374 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
375 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
379 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
381 if (!st->codec->width && !st->codec->height) {
382 st->codec->width = width;
383 st->codec->height = height;
385 ff_add_param_change(pkt, 0, 0, 0, width, height);
388 pkt->stream_index = st->index;
392 pix_fmt = AV_PIX_FMT_PAL8;
393 for (i = 0; i < colormapsize; i++)
394 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
395 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
396 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
398 res = AVERROR(ENOMEM);
401 memcpy(pal, colormap, AVPALETTE_SIZE);
404 pix_fmt = AV_PIX_FMT_RGB555;
407 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
412 if (st->codec->pix_fmt != AV_PIX_FMT_NONE && st->codec->pix_fmt != pix_fmt) {
413 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
415 st->codec->pix_fmt = pix_fmt;
417 if (linesize * height > pkt->size) {
418 res = AVERROR_INVALIDDATA;
421 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
433 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
435 } else if (tag == TAG_STREAMBLOCK) {
436 for (i = 0; i < s->nb_streams; i++) {
438 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
439 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
444 if ((res = av_get_packet(pb, pkt, len)) < 0)
446 } else { // ADPCM, PCM
449 if ((res = av_get_packet(pb, pkt, len)) < 0)
453 pkt->stream_index = st->index;
457 } else if (tag == TAG_JPEG2) {
458 for (i=0; i<s->nb_streams; i++) {
460 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
463 if (i == s->nb_streams) {
464 vst = avformat_new_stream(s, NULL);
466 return AVERROR(ENOMEM);
467 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
468 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
469 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
470 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
473 avio_rl16(pb); /* BITMAP_ID */
477 if ((res = av_new_packet(pkt, len)) < 0)
479 if (avio_read(pb, pkt->data, 4) != 4) {
481 return AVERROR_INVALIDDATA;
483 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
484 AV_RB32(pkt->data) == 0xffd9ffd8) {
485 /* old SWF files containing SOI/EOI as data start */
486 /* files created by swink have reversed tag */
488 memset(pkt->data+pkt->size, 0, 4);
489 res = avio_read(pb, pkt->data, pkt->size);
491 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
495 if (res != pkt->size) {
500 av_shrink_packet(pkt, res);
504 pkt->stream_index = st->index;
507 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
511 av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);
518 static av_cold int swf_read_close(AVFormatContext *avctx)
520 SWFContext *s = avctx->priv_data;
521 inflateEnd(&s->zstream);
522 av_freep(&s->zbuf_in);
523 av_freep(&s->zbuf_out);
529 AVInputFormat ff_swf_demuxer = {
531 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
532 .priv_data_size = sizeof(SWFContext),
533 .read_probe = swf_probe,
534 .read_header = swf_read_header,
535 .read_packet = swf_read_packet,
537 .read_close = swf_read_close,