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(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 + 3, p->buf_size - 3) < 0)
85 len = get_bits(&gb, 5);
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)
95 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
96 return AVPROBE_SCORE_MAX / 4;
98 return AVPROBE_SCORE_MAX;
102 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
104 AVFormatContext *s = opaque;
105 SWFContext *swf = s->priv_data;
106 z_stream *z = &swf->zstream;
111 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
114 z->next_in = swf->zbuf_in;
119 z->avail_out = buf_size;
121 ret = inflate(z, Z_NO_FLUSH);
123 return AVERROR(EINVAL);
124 if (ret == Z_STREAM_END)
127 if (buf_size - z->avail_out == 0)
130 return buf_size - z->avail_out;
134 static int swf_read_header(AVFormatContext *s)
136 SWFContext *swf = s->priv_data;
137 AVIOContext *pb = s->pb;
140 tag = avio_rb32(pb) & 0xffffff00;
143 if (tag == MKBETAG('C', 'W', 'S', 0)) {
144 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
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);
159 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
162 } else if (tag != MKBETAG('F', 'W', 'S', 0))
164 /* skip rectangle size */
165 nbits = avio_r8(pb) >> 3;
166 len = (4 * nbits - 3 + 7) / 8;
168 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
169 avio_rl16(pb); /* frame count */
171 swf->samples_per_frame = 0;
172 s->ctx_flags |= AVFMTCTX_NOHEADER;
176 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
178 int sample_rate_code, sample_size_code;
179 AVStream *ast = avformat_new_stream(s, NULL);
184 ast->codecpar->channels = 2;
185 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
187 ast->codecpar->channels = 1;
188 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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);
202 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
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;
215 uint64_t pos = avio_tell(pb);
216 tag = get_swf_tag(pb, &len);
220 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
221 return AVERROR_INVALIDDATA;
223 if (tag == TAG_VIDEOSTREAM) {
224 int ch_id = avio_rl16(pb);
227 for (i=0; i<s->nb_streams; i++) {
229 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
238 vst = avformat_new_stream(s, NULL);
240 return AVERROR(ENOMEM);
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);
246 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
247 /* streaming found */
249 for (i=0; i<s->nb_streams; i++) {
251 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
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 */
260 return AVERROR(ENOMEM);
262 } else if (tag == TAG_DEFINESOUND) {
264 int ch_id = avio_rl16(pb);
266 for (i=0; i<s->nb_streams; i++) {
268 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
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.
276 ast = create_new_audio_stream(s, ch_id, v);
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);
285 if ((res = av_get_packet(pb, pkt, len)) < 0)
288 pkt->stream_index = ast->index;
290 } else if (tag == TAG_VIDEOFRAME) {
291 int ch_id = avio_rl16(pb);
293 for(i=0; i<s->nb_streams; i++) {
295 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
296 frame = avio_rl16(pb);
300 if ((res = av_get_packet(pb, pkt, len)) < 0)
304 pkt->stream_index = st->index;
308 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
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;
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);
328 colormapsize = avio_r8(pb) + 1;
332 linesize = width * 2;
334 case 5: // RGB24 (0RGB)
335 linesize = width * 4;
338 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
339 goto bitmap_end_skip;
342 linesize = FFALIGN(linesize, 4);
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;
351 out_len = colormapsize * colormapbpp + linesize * height;
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);
356 zbuf = av_malloc(len);
357 buf = av_malloc(out_len);
359 res = AVERROR(ENOMEM);
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;
369 for (i = 0; i < s->nb_streams; i++) {
371 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
374 if (i == s->nb_streams) {
375 vst = avformat_new_stream(s, NULL);
377 res = AVERROR(ENOMEM);
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);
387 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
389 if (!st->codecpar->width && !st->codecpar->height) {
390 st->codecpar->width = width;
391 st->codecpar->height = height;
393 ff_add_param_change(pkt, 0, 0, 0, width, height);
396 pkt->stream_index = st->index;
400 pix_fmt = AV_PIX_FMT_PAL8;
401 for (i = 0; i < colormapsize; i++)
402 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
403 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
404 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
406 res = AVERROR(ENOMEM);
409 memcpy(pal, colormap, AVPALETTE_SIZE);
412 pix_fmt = AV_PIX_FMT_RGB555;
415 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
420 if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
421 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
423 st->codecpar->format = pix_fmt;
425 if (linesize * height > pkt->size) {
426 res = AVERROR_INVALIDDATA;
429 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
441 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
443 } else if (tag == TAG_STREAMBLOCK) {
444 for (i = 0; i < s->nb_streams; i++) {
446 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
447 if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
452 if ((res = av_get_packet(pb, pkt, len)) < 0)
454 } else { // ADPCM, PCM
457 if ((res = av_get_packet(pb, pkt, len)) < 0)
461 pkt->stream_index = st->index;
465 } else if (tag == TAG_JPEG2) {
466 for (i=0; i<s->nb_streams; i++) {
468 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
471 if (i == s->nb_streams) {
472 vst = avformat_new_stream(s, NULL);
474 return AVERROR(ENOMEM);
475 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
476 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
477 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
478 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
481 avio_rl16(pb); /* BITMAP_ID */
485 if ((res = av_new_packet(pkt, len)) < 0)
487 if (avio_read(pb, pkt->data, 4) != 4) {
488 av_packet_unref(pkt);
489 return AVERROR_INVALIDDATA;
491 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
492 AV_RB32(pkt->data) == 0xffd9ffd8) {
493 /* old SWF files containing SOI/EOI as data start */
494 /* files created by swink have reversed tag */
496 memset(pkt->data+pkt->size, 0, 4);
497 res = avio_read(pb, pkt->data, pkt->size);
499 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
503 if (res != pkt->size) {
505 av_packet_unref(pkt);
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, "Cliping 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);
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,