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"
29 static const AVCodecTag swf_audio_codec_tags[] = {
30 { AV_CODEC_ID_PCM_S16LE, 0x00 },
31 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
32 { AV_CODEC_ID_MP3, 0x02 },
33 { AV_CODEC_ID_PCM_S16LE, 0x03 },
34 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
35 { AV_CODEC_ID_NONE, 0 },
38 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
56 static int swf_probe(AVProbeData *p)
61 /* check file header */
62 if ( AV_RB24(p->buf) != AV_RB24("CWS")
63 && AV_RB24(p->buf) != AV_RB24("FWS"))
67 return AVPROBE_SCORE_MAX / 4;
69 return AVPROBE_SCORE_MAX;
73 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
75 AVFormatContext *s = opaque;
76 SWFContext *swf = s->priv_data;
77 z_stream *z = &swf->zstream;
82 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
85 z->next_in = swf->zbuf_in;
90 z->avail_out = buf_size;
92 ret = inflate(z, Z_NO_FLUSH);
94 return AVERROR(EINVAL);
95 if (ret == Z_STREAM_END)
98 if (buf_size - z->avail_out == 0)
101 return buf_size - z->avail_out;
105 static int swf_read_header(AVFormatContext *s)
107 SWFContext *swf = s->priv_data;
108 AVIOContext *pb = s->pb;
111 tag = avio_rb32(pb) & 0xffffff00;
114 if (tag == MKBETAG('C', 'W', 'S', 0)) {
115 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
117 swf->zbuf_in = av_malloc(ZBUF_SIZE);
118 swf->zbuf_out = av_malloc(ZBUF_SIZE);
119 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
120 zlib_refill, NULL, NULL);
121 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
122 return AVERROR(ENOMEM);
123 swf->zpb->seekable = 0;
124 if (inflateInit(&swf->zstream) != Z_OK) {
125 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
126 return AVERROR(EINVAL);
130 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
133 } else if (tag != MKBETAG('F', 'W', 'S', 0))
135 /* skip rectangle size */
136 nbits = avio_r8(pb) >> 3;
137 len = (4 * nbits - 3 + 7) / 8;
139 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
140 avio_rl16(pb); /* frame count */
142 swf->samples_per_frame = 0;
143 s->ctx_flags |= AVFMTCTX_NOHEADER;
147 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
149 int sample_rate_code, sample_size_code;
150 AVStream *ast = avformat_new_stream(s, NULL);
155 ast->codec->channels = 2;
156 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
158 ast->codec->channels = 1;
159 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
161 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
162 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
163 ast->need_parsing = AVSTREAM_PARSE_FULL;
164 sample_rate_code = info>>2 & 3;
165 sample_size_code = info>>1 & 1;
166 if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE)
167 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
168 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
169 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
173 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
175 SWFContext *swf = s->priv_data;
176 AVIOContext *pb = s->pb;
177 AVStream *vst = NULL, *ast = NULL, *st = 0;
178 int tag, len, i, frame, v, res;
186 uint64_t pos = avio_tell(pb);
187 tag = get_swf_tag(pb, &len);
191 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
192 return AVERROR_INVALIDDATA;
194 if (tag == TAG_VIDEOSTREAM) {
195 int ch_id = avio_rl16(pb);
198 for (i=0; i<s->nb_streams; i++) {
200 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
209 vst = avformat_new_stream(s, NULL);
211 return AVERROR(ENOMEM);
213 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
214 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
215 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
217 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
218 /* streaming found */
220 for (i=0; i<s->nb_streams; i++) {
222 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
228 swf->samples_per_frame = avio_rl16(pb);
229 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
231 return AVERROR(ENOMEM);
233 } else if (tag == TAG_DEFINESOUND) {
235 int ch_id = avio_rl16(pb);
237 for (i=0; i<s->nb_streams; i++) {
239 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
243 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
244 // these are smaller audio streams in DEFINESOUND tags, but it's technically
245 // possible they could be huge. Break it up into multiple packets if it's big.
247 ast = create_new_audio_stream(s, ch_id, v);
249 return AVERROR(ENOMEM);
250 ast->duration = avio_rl32(pb); // number of samples
251 if (((v>>4) & 15) == 2) { // MP3 sound data record
252 ast->skip_samples = avio_rl16(pb);
256 if ((res = av_get_packet(pb, pkt, len)) < 0)
259 pkt->stream_index = ast->index;
261 } else if (tag == TAG_VIDEOFRAME) {
262 int ch_id = avio_rl16(pb);
264 for(i=0; i<s->nb_streams; i++) {
266 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
267 frame = avio_rl16(pb);
271 if ((res = av_get_packet(pb, pkt, len)) < 0)
275 pkt->stream_index = st->index;
279 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
282 uint8_t *buf = NULL, *zbuf = NULL, *pal;
283 uint32_t colormap[AVPALETTE_COUNT] = {0};
284 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
285 const int colormapbpp = 3 + alpha_bmp;
286 int linesize, colormapsize = 0;
288 const int ch_id = avio_rl16(pb);
289 const int bmp_fmt = avio_r8(pb);
290 const int width = avio_rl16(pb);
291 const int height = avio_rl16(pb);
299 colormapsize = avio_r8(pb) + 1;
303 linesize = width * 2;
305 case 5: // RGB24 (0RGB)
306 linesize = width * 4;
309 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
310 goto bitmap_end_skip;
313 linesize = FFALIGN(linesize, 4);
315 if (av_image_check_size(width, height, 0, s) < 0 ||
316 linesize >= INT_MAX / height ||
317 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
318 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
319 goto bitmap_end_skip;
322 out_len = colormapsize * colormapbpp + linesize * height;
324 av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
325 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
327 zbuf = av_malloc(len);
328 buf = av_malloc(out_len);
330 res = AVERROR(ENOMEM);
334 len = avio_read(pb, zbuf, len);
335 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
336 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
337 goto bitmap_end_skip;
340 for (i = 0; i < s->nb_streams; i++) {
342 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
345 if (i == s->nb_streams) {
346 vst = avformat_new_stream(s, NULL);
348 res = AVERROR(ENOMEM);
351 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
352 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
353 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
354 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
358 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
360 if (!st->codec->width && !st->codec->height) {
361 st->codec->width = width;
362 st->codec->height = height;
364 ff_add_param_change(pkt, 0, 0, 0, width, height);
367 pkt->stream_index = st->index;
371 pix_fmt = AV_PIX_FMT_PAL8;
372 for (i = 0; i < colormapsize; i++)
373 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
374 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
375 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
377 res = AVERROR(ENOMEM);
380 memcpy(pal, colormap, AVPALETTE_SIZE);
383 pix_fmt = AV_PIX_FMT_RGB555;
386 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
391 if (st->codec->pix_fmt != AV_PIX_FMT_NONE && st->codec->pix_fmt != pix_fmt) {
392 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
393 res = AVERROR_PATCHWELCOME;
396 st->codec->pix_fmt = pix_fmt;
398 if (linesize * height > pkt->size) {
399 res = AVERROR_INVALIDDATA;
402 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
414 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
416 } else if (tag == TAG_STREAMBLOCK) {
417 for (i = 0; i < s->nb_streams; i++) {
419 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
420 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
425 if ((res = av_get_packet(pb, pkt, len)) < 0)
427 } else { // ADPCM, PCM
430 if ((res = av_get_packet(pb, pkt, len)) < 0)
434 pkt->stream_index = st->index;
438 } else if (tag == TAG_JPEG2) {
439 for (i=0; i<s->nb_streams; i++) {
441 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
444 if (i == s->nb_streams) {
445 vst = avformat_new_stream(s, NULL);
447 return AVERROR(ENOMEM);
448 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
449 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
450 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
451 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
454 avio_rl16(pb); /* BITMAP_ID */
458 if ((res = av_new_packet(pkt, len)) < 0)
460 if (avio_read(pb, pkt->data, 4) != 4) {
462 return AVERROR_INVALIDDATA;
464 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
465 AV_RB32(pkt->data) == 0xffd9ffd8) {
466 /* old SWF files containing SOI/EOI as data start */
467 /* files created by swink have reversed tag */
469 memset(pkt->data+pkt->size, 0, 4);
470 res = avio_read(pb, pkt->data, pkt->size);
472 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
476 if (res != pkt->size) {
481 av_shrink_packet(pkt, res);
485 pkt->stream_index = st->index;
488 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
492 av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);
499 static av_cold int swf_read_close(AVFormatContext *avctx)
501 SWFContext *s = avctx->priv_data;
502 inflateEnd(&s->zstream);
503 av_freep(&s->zbuf_in);
504 av_freep(&s->zbuf_out);
510 AVInputFormat ff_swf_demuxer = {
512 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
513 .priv_data_size = sizeof(SWFContext),
514 .read_probe = swf_probe,
515 .read_header = swf_read_header,
516 .read_packet = swf_read_packet,
518 .read_close = swf_read_close,