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/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavcodec/get_bits.h"
31 static const AVCodecTag swf_audio_codec_tags[] = {
32 { AV_CODEC_ID_PCM_S16LE, 0x00 },
33 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
34 { AV_CODEC_ID_MP3, 0x02 },
35 { AV_CODEC_ID_PCM_S16LE, 0x03 },
36 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
37 { AV_CODEC_ID_NONE, 0 },
40 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
58 static int swf_probe(AVProbeData *p)
61 int len, xmin, xmax, ymin, ymax;
66 /* check file header */
67 if ( AV_RB24(p->buf) != AV_RB24("CWS")
68 && AV_RB24(p->buf) != AV_RB24("FWS"))
71 if ( AV_RB24(p->buf) == AV_RB24("CWS")
73 return AVPROBE_SCORE_MAX / 4 + 1;
75 init_get_bits8(&gb, p->buf + 3, p->buf_size - 3);
78 len = get_bits(&gb, 5);
81 xmin = get_bits_long(&gb, len);
82 xmax = get_bits_long(&gb, len);
83 ymin = get_bits_long(&gb, len);
84 ymax = get_bits_long(&gb, len);
85 if (xmin || ymin || !xmax || !ymax)
88 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
89 return AVPROBE_SCORE_MAX / 4;
91 return AVPROBE_SCORE_MAX;
95 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
97 AVFormatContext *s = opaque;
98 SWFContext *swf = s->priv_data;
99 z_stream *z = &swf->zstream;
104 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
107 z->next_in = swf->zbuf_in;
112 z->avail_out = buf_size;
114 ret = inflate(z, Z_NO_FLUSH);
116 return AVERROR(EINVAL);
117 if (ret == Z_STREAM_END)
120 if (buf_size - z->avail_out == 0)
123 return buf_size - z->avail_out;
127 static int swf_read_header(AVFormatContext *s)
129 SWFContext *swf = s->priv_data;
130 AVIOContext *pb = s->pb;
133 tag = avio_rb32(pb) & 0xffffff00;
136 if (tag == MKBETAG('C', 'W', 'S', 0)) {
137 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
139 swf->zbuf_in = av_malloc(ZBUF_SIZE);
140 swf->zbuf_out = av_malloc(ZBUF_SIZE);
141 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
142 zlib_refill, NULL, NULL);
143 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
144 return AVERROR(ENOMEM);
145 swf->zpb->seekable = 0;
146 if (inflateInit(&swf->zstream) != Z_OK) {
147 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
148 return AVERROR(EINVAL);
152 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
155 } else if (tag != MKBETAG('F', 'W', 'S', 0))
157 /* skip rectangle size */
158 nbits = avio_r8(pb) >> 3;
159 len = (4 * nbits - 3 + 7) / 8;
161 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
162 avio_rl16(pb); /* frame count */
164 swf->samples_per_frame = 0;
165 s->ctx_flags |= AVFMTCTX_NOHEADER;
169 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
171 int sample_rate_code, sample_size_code;
172 AVStream *ast = avformat_new_stream(s, NULL);
177 ast->codec->channels = 2;
178 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
180 ast->codec->channels = 1;
181 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
183 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
184 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
185 ast->need_parsing = AVSTREAM_PARSE_FULL;
186 sample_rate_code = info>>2 & 3;
187 sample_size_code = info>>1 & 1;
188 if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE)
189 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
190 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
191 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
195 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
197 SWFContext *swf = s->priv_data;
198 AVIOContext *pb = s->pb;
199 AVStream *vst = NULL, *ast = NULL, *st = 0;
200 int tag, len, i, frame, v, res;
208 uint64_t pos = avio_tell(pb);
209 tag = get_swf_tag(pb, &len);
213 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
214 return AVERROR_INVALIDDATA;
216 if (tag == TAG_VIDEOSTREAM) {
217 int ch_id = avio_rl16(pb);
220 for (i=0; i<s->nb_streams; i++) {
222 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
231 vst = avformat_new_stream(s, NULL);
233 return AVERROR(ENOMEM);
235 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
236 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
237 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
239 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
240 /* streaming found */
242 for (i=0; i<s->nb_streams; i++) {
244 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
250 swf->samples_per_frame = avio_rl16(pb);
251 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
253 return AVERROR(ENOMEM);
255 } else if (tag == TAG_DEFINESOUND) {
257 int ch_id = avio_rl16(pb);
259 for (i=0; i<s->nb_streams; i++) {
261 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
265 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
266 // these are smaller audio streams in DEFINESOUND tags, but it's technically
267 // possible they could be huge. Break it up into multiple packets if it's big.
269 ast = create_new_audio_stream(s, ch_id, v);
271 return AVERROR(ENOMEM);
272 ast->duration = avio_rl32(pb); // number of samples
273 if (((v>>4) & 15) == 2) { // MP3 sound data record
274 ast->skip_samples = avio_rl16(pb);
278 if ((res = av_get_packet(pb, pkt, len)) < 0)
281 pkt->stream_index = ast->index;
283 } else if (tag == TAG_VIDEOFRAME) {
284 int ch_id = avio_rl16(pb);
286 for(i=0; i<s->nb_streams; i++) {
288 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
289 frame = avio_rl16(pb);
293 if ((res = av_get_packet(pb, pkt, len)) < 0)
297 pkt->stream_index = st->index;
301 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
304 uint8_t *buf = NULL, *zbuf = NULL, *pal;
305 uint32_t colormap[AVPALETTE_COUNT] = {0};
306 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
307 const int colormapbpp = 3 + alpha_bmp;
308 int linesize, colormapsize = 0;
310 const int ch_id = avio_rl16(pb);
311 const int bmp_fmt = avio_r8(pb);
312 const int width = avio_rl16(pb);
313 const int height = avio_rl16(pb);
321 colormapsize = avio_r8(pb) + 1;
325 linesize = width * 2;
327 case 5: // RGB24 (0RGB)
328 linesize = width * 4;
331 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
332 goto bitmap_end_skip;
335 linesize = FFALIGN(linesize, 4);
337 if (av_image_check_size(width, height, 0, s) < 0 ||
338 linesize >= INT_MAX / height ||
339 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
340 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
341 goto bitmap_end_skip;
344 out_len = colormapsize * colormapbpp + linesize * height;
346 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
347 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
349 zbuf = av_malloc(len);
350 buf = av_malloc(out_len);
352 res = AVERROR(ENOMEM);
356 len = avio_read(pb, zbuf, len);
357 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
358 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
359 goto bitmap_end_skip;
362 for (i = 0; i < s->nb_streams; i++) {
364 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
367 if (i == s->nb_streams) {
368 vst = avformat_new_stream(s, NULL);
370 res = AVERROR(ENOMEM);
373 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
374 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
375 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
376 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
380 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
382 if (!st->codec->width && !st->codec->height) {
383 st->codec->width = width;
384 st->codec->height = height;
386 ff_add_param_change(pkt, 0, 0, 0, width, height);
389 pkt->stream_index = st->index;
393 pix_fmt = AV_PIX_FMT_PAL8;
394 for (i = 0; i < colormapsize; i++)
395 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
396 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
397 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
399 res = AVERROR(ENOMEM);
402 memcpy(pal, colormap, AVPALETTE_SIZE);
405 pix_fmt = AV_PIX_FMT_RGB555;
408 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
413 if (st->codec->pix_fmt != AV_PIX_FMT_NONE && st->codec->pix_fmt != pix_fmt) {
414 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
416 st->codec->pix_fmt = pix_fmt;
418 if (linesize * height > pkt->size) {
419 res = AVERROR_INVALIDDATA;
422 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
434 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
436 } else if (tag == TAG_STREAMBLOCK) {
437 for (i = 0; i < s->nb_streams; i++) {
439 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
440 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
445 if ((res = av_get_packet(pb, pkt, len)) < 0)
447 } else { // ADPCM, PCM
450 if ((res = av_get_packet(pb, pkt, len)) < 0)
454 pkt->stream_index = st->index;
458 } else if (tag == TAG_JPEG2) {
459 for (i=0; i<s->nb_streams; i++) {
461 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
464 if (i == s->nb_streams) {
465 vst = avformat_new_stream(s, NULL);
467 return AVERROR(ENOMEM);
468 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
469 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
470 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
471 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
474 avio_rl16(pb); /* BITMAP_ID */
478 if ((res = av_new_packet(pkt, len)) < 0)
480 if (avio_read(pb, pkt->data, 4) != 4) {
482 return AVERROR_INVALIDDATA;
484 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
485 AV_RB32(pkt->data) == 0xffd9ffd8) {
486 /* old SWF files containing SOI/EOI as data start */
487 /* files created by swink have reversed tag */
489 memset(pkt->data+pkt->size, 0, 4);
490 res = avio_read(pb, pkt->data, pkt->size);
492 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
496 if (res != pkt->size) {
501 av_shrink_packet(pkt, res);
505 pkt->stream_index = st->index;
508 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
512 av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);
519 static av_cold int swf_read_close(AVFormatContext *avctx)
521 SWFContext *s = avctx->priv_data;
522 inflateEnd(&s->zstream);
523 av_freep(&s->zbuf_in);
524 av_freep(&s->zbuf_out);
530 AVInputFormat ff_swf_demuxer = {
532 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
533 .priv_data_size = sizeof(SWFContext),
534 .read_probe = swf_probe,
535 .read_header = swf_read_header,
536 .read_packet = swf_read_packet,
538 .read_close = swf_read_close,