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
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"
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 },
46 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
64 static int swf_probe(const AVProbeData *p)
67 int len, xmin, xmax, ymin, ymax;
72 /* check file header */
73 if ( AV_RB24(p->buf) != AV_RB24("CWS")
74 && AV_RB24(p->buf) != AV_RB24("FWS"))
77 if ( AV_RB24(p->buf) == AV_RB24("CWS")
79 return AVPROBE_SCORE_MAX / 4 + 1;
81 if (init_get_bits8(&gb, p->buf + 8, p->buf_size - 8) < 0)
84 len = get_bits(&gb, 5);
87 xmin = get_bits_long(&gb, len);
88 xmax = get_bits_long(&gb, len);
89 ymin = get_bits_long(&gb, len);
90 ymax = get_bits_long(&gb, len);
91 if (xmin || ymin || !xmax || !ymax)
94 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
95 return AVPROBE_SCORE_MAX / 4;
97 return AVPROBE_SCORE_EXTENSION + 1;
101 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
103 AVFormatContext *s = opaque;
104 SWFContext *swf = s->priv_data;
105 z_stream *z = &swf->zstream;
110 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
113 z->next_in = swf->zbuf_in;
118 z->avail_out = buf_size;
120 ret = inflate(z, Z_NO_FLUSH);
121 if (ret == Z_STREAM_END)
124 return AVERROR(EINVAL);
126 if (buf_size - z->avail_out == 0)
129 return buf_size - z->avail_out;
133 static int swf_read_header(AVFormatContext *s)
135 SWFContext *swf = s->priv_data;
136 AVIOContext *pb = s->pb;
139 tag = avio_rb32(pb) & 0xffffff00;
142 if (tag == MKBETAG('C', 'W', 'S', 0)) {
143 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
145 swf->zbuf_in = av_malloc(ZBUF_SIZE);
146 swf->zbuf_out = av_malloc(ZBUF_SIZE);
147 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
148 zlib_refill, NULL, NULL);
149 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
150 return AVERROR(ENOMEM);
151 swf->zpb->seekable = 0;
152 if (inflateInit(&swf->zstream) != Z_OK) {
153 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
154 av_freep(&swf->zbuf_in);
155 av_freep(&swf->zbuf_out);
156 return AVERROR(EINVAL);
160 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
163 } else if (tag != MKBETAG('F', 'W', 'S', 0))
165 /* skip rectangle size */
166 nbits = avio_r8(pb) >> 3;
167 len = (4 * nbits - 3 + 7) / 8;
169 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
170 avio_rl16(pb); /* frame count */
172 swf->samples_per_frame = 0;
173 s->ctx_flags |= AVFMTCTX_NOHEADER;
177 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
179 int sample_rate_code, sample_size_code;
180 AVStream *ast = avformat_new_stream(s, NULL);
185 ast->codecpar->channels = 2;
186 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
188 ast->codecpar->channels = 1;
189 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
191 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
192 ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
193 ast->need_parsing = AVSTREAM_PARSE_FULL;
194 sample_rate_code = info>>2 & 3;
195 sample_size_code = info>>1 & 1;
196 if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
197 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
198 ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
199 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
203 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
205 SWFContext *swf = s->priv_data;
206 AVIOContext *pb = s->pb;
207 AVStream *vst = NULL, *ast = NULL, *st = 0;
208 int tag, len, i, frame, v, res;
216 uint64_t pos = avio_tell(pb);
217 tag = get_swf_tag(pb, &len);
221 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
222 return AVERROR_INVALIDDATA;
224 if (tag == TAG_VIDEOSTREAM) {
225 int ch_id = avio_rl16(pb);
228 for (i=0; i<s->nb_streams; i++) {
230 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
239 vst = avformat_new_stream(s, NULL);
241 return AVERROR(ENOMEM);
243 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
244 vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
245 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
247 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
248 /* streaming found */
250 for (i=0; i<s->nb_streams; i++) {
252 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
258 swf->samples_per_frame = avio_rl16(pb);
259 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
261 return AVERROR(ENOMEM);
263 } else if (tag == TAG_DEFINESOUND) {
265 int ch_id = avio_rl16(pb);
267 for (i=0; i<s->nb_streams; i++) {
269 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
273 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
274 // these are smaller audio streams in DEFINESOUND tags, but it's technically
275 // possible they could be huge. Break it up into multiple packets if it's big.
277 ast = create_new_audio_stream(s, ch_id, v);
279 return AVERROR(ENOMEM);
280 ast->duration = avio_rl32(pb); // number of samples
281 if (((v>>4) & 15) == 2) { // MP3 sound data record
282 ast->skip_samples = avio_rl16(pb);
286 if ((res = av_get_packet(pb, pkt, len)) < 0)
289 pkt->stream_index = ast->index;
291 } else if (tag == TAG_VIDEOFRAME) {
292 int ch_id = avio_rl16(pb);
294 for(i=0; i<s->nb_streams; i++) {
296 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
297 frame = avio_rl16(pb);
301 if ((res = av_get_packet(pb, pkt, len)) < 0)
305 pkt->stream_index = st->index;
309 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
312 uint8_t *buf = NULL, *zbuf = NULL, *pal;
313 uint32_t colormap[AVPALETTE_COUNT] = {0};
314 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
315 const int colormapbpp = 3 + alpha_bmp;
316 int linesize, colormapsize = 0;
318 const int ch_id = avio_rl16(pb);
319 const int bmp_fmt = avio_r8(pb);
320 const int width = avio_rl16(pb);
321 const int height = avio_rl16(pb);
329 colormapsize = avio_r8(pb) + 1;
333 linesize = width * 2;
335 case 5: // RGB24 (0RGB)
336 linesize = width * 4;
339 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
340 goto bitmap_end_skip;
343 linesize = FFALIGN(linesize, 4);
345 if (av_image_check_size(width, height, 0, s) < 0 ||
346 linesize >= INT_MAX / height ||
347 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
348 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
349 goto bitmap_end_skip;
352 out_len = colormapsize * colormapbpp + linesize * height;
354 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
355 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
357 zbuf = av_malloc(len);
358 buf = av_malloc(out_len);
360 res = AVERROR(ENOMEM);
364 len = avio_read(pb, zbuf, len);
365 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
366 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
367 goto bitmap_end_skip;
370 for (i = 0; i < s->nb_streams; i++) {
372 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
375 if (i == s->nb_streams) {
376 vst = avformat_new_stream(s, NULL);
378 res = AVERROR(ENOMEM);
381 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
382 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
383 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
384 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
388 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
390 if (!st->codecpar->width && !st->codecpar->height) {
391 st->codecpar->width = width;
392 st->codecpar->height = height;
394 ff_add_param_change(pkt, 0, 0, 0, width, height);
397 pkt->stream_index = st->index;
399 if (linesize * height > pkt->size) {
400 res = AVERROR_INVALIDDATA;
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);
412 res = AVERROR(ENOMEM);
415 memcpy(pal, colormap, AVPALETTE_SIZE);
418 pix_fmt = AV_PIX_FMT_RGB555;
421 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
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");
429 st->codecpar->format = pix_fmt;
431 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
443 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
445 } else if (tag == TAG_STREAMBLOCK) {
446 for (i = 0; i < s->nb_streams; i++) {
448 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
449 if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
454 if ((res = av_get_packet(pb, pkt, len)) < 0)
456 } else { // ADPCM, PCM
459 if ((res = av_get_packet(pb, pkt, len)) < 0)
463 pkt->stream_index = st->index;
467 } else if (tag == TAG_JPEG2) {
468 for (i=0; i<s->nb_streams; i++) {
470 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
473 if (i == s->nb_streams) {
474 vst = avformat_new_stream(s, NULL);
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);
483 avio_rl16(pb); /* BITMAP_ID */
487 if ((res = av_new_packet(pkt, len)) < 0)
489 if (avio_read(pb, pkt->data, 4) != 4) {
490 return AVERROR_INVALIDDATA;
492 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
493 AV_RB32(pkt->data) == 0xffd9ffd8) {
494 /* old SWF files containing SOI/EOI as data start */
495 /* files created by swink have reversed tag */
497 memset(pkt->data+pkt->size, 0, 4);
498 res = avio_read(pb, pkt->data, pkt->size);
500 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
504 if (res != pkt->size) {
508 av_shrink_packet(pkt, res);
512 pkt->stream_index = st->index;
515 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
519 av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
526 static av_cold int swf_read_close(AVFormatContext *avctx)
528 SWFContext *s = avctx->priv_data;
529 inflateEnd(&s->zstream);
530 av_freep(&s->zbuf_in);
531 av_freep(&s->zbuf_out);
532 avio_context_free(&s->zpb);
537 AVInputFormat ff_swf_demuxer = {
539 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
540 .priv_data_size = sizeof(SWFContext),
541 .read_probe = swf_probe,
542 .read_header = swf_read_header,
543 .read_packet = swf_read_packet,
545 .read_close = swf_read_close,