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)
58 /* check file header */
59 if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
61 return AVPROBE_SCORE_MAX;
67 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
69 AVFormatContext *s = opaque;
70 SWFContext *swf = s->priv_data;
71 z_stream *z = &swf->zstream;
76 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
79 z->next_in = swf->zbuf_in;
84 z->avail_out = buf_size;
86 ret = inflate(z, Z_NO_FLUSH);
88 return AVERROR(EINVAL);
89 if (ret == Z_STREAM_END)
92 if (buf_size - z->avail_out == 0)
95 return buf_size - z->avail_out;
99 static int swf_read_header(AVFormatContext *s)
101 SWFContext *swf = s->priv_data;
102 AVIOContext *pb = s->pb;
105 tag = avio_rb32(pb) & 0xffffff00;
108 if (tag == MKBETAG('C', 'W', 'S', 0)) {
109 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
111 swf->zbuf_in = av_malloc(ZBUF_SIZE);
112 swf->zbuf_out = av_malloc(ZBUF_SIZE);
113 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
114 zlib_refill, NULL, NULL);
115 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
116 return AVERROR(ENOMEM);
117 swf->zpb->seekable = 0;
118 if (inflateInit(&swf->zstream) != Z_OK) {
119 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
120 return AVERROR(EINVAL);
124 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
127 } else if (tag != MKBETAG('F', 'W', 'S', 0))
129 /* skip rectangle size */
130 nbits = avio_r8(pb) >> 3;
131 len = (4 * nbits - 3 + 7) / 8;
133 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
134 avio_rl16(pb); /* frame count */
136 swf->samples_per_frame = 0;
137 s->ctx_flags |= AVFMTCTX_NOHEADER;
141 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
143 SWFContext *swf = s->priv_data;
144 AVIOContext *pb = s->pb;
145 AVStream *vst = NULL, *ast = NULL, *st = 0;
146 int tag, len, i, frame, v, res;
154 uint64_t pos = avio_tell(pb);
155 tag = get_swf_tag(pb, &len);
158 if (tag == TAG_VIDEOSTREAM) {
159 int ch_id = avio_rl16(pb);
162 for (i=0; i<s->nb_streams; i++) {
164 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
173 vst = avformat_new_stream(s, NULL);
175 return AVERROR(ENOMEM);
177 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
178 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
179 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
181 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
182 /* streaming found */
183 int sample_rate_code;
185 for (i=0; i<s->nb_streams; i++) {
187 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
193 swf->samples_per_frame = avio_rl16(pb);
194 ast = avformat_new_stream(s, NULL);
196 return AVERROR(ENOMEM);
197 ast->id = -1; /* -1 to avoid clash with video stream ch_id */
199 ast->codec->channels = 2;
200 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
202 ast->codec->channels = 1;
203 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
205 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
206 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
207 ast->need_parsing = AVSTREAM_PARSE_FULL;
208 sample_rate_code= (v>>2) & 3;
209 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
210 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
212 } else if (tag == TAG_DEFINESOUND) {
214 int sample_rate_code;
215 int ch_id = avio_rl16(pb);
217 for (i=0; i<s->nb_streams; i++) {
219 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
223 // FIXME: 8-bit uncompressed PCM audio will be interpreted as 16-bit
224 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
225 // these are smaller audio streams in DEFINESOUND tags, but it's technically
226 // possible they could be huge. Break it up into multiple packets if it's big.
228 ast = avformat_new_stream(s, NULL);
230 return AVERROR(ENOMEM);
232 ast->codec->channels = 1 + (v&1);
233 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
234 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
235 ast->need_parsing = AVSTREAM_PARSE_FULL;
236 sample_rate_code= (v>>2) & 3;
237 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
238 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
239 ast->duration = avio_rl32(pb); // number of samples
240 if (((v>>4) & 15) == 2) { // MP3 sound data record
241 ast->skip_samples = avio_rl16(pb);
245 if ((res = av_get_packet(pb, pkt, len)) < 0)
248 pkt->stream_index = ast->index;
250 } else if (tag == TAG_VIDEOFRAME) {
251 int ch_id = avio_rl16(pb);
253 for(i=0; i<s->nb_streams; i++) {
255 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
256 frame = avio_rl16(pb);
257 if ((res = av_get_packet(pb, pkt, len-2)) < 0)
261 pkt->stream_index = st->index;
265 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
268 uint8_t *buf = NULL, *zbuf = NULL, *pal;
269 uint32_t colormap[AVPALETTE_COUNT] = {0};
270 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
271 const int colormapbpp = 3 + alpha_bmp;
272 int linesize, colormapsize = 0;
274 const int ch_id = avio_rl16(pb);
275 const int bmp_fmt = avio_r8(pb);
276 const int width = avio_rl16(pb);
277 const int height = avio_rl16(pb);
284 colormapsize = avio_r8(pb) + 1;
288 linesize = width * 2;
290 case 5: // RGB24 (0RGB)
291 linesize = width * 4;
294 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
295 goto bitmap_end_skip;
298 linesize = FFALIGN(linesize, 4);
300 if (av_image_check_size(width, height, 0, s) < 0 ||
301 linesize >= INT_MAX / height ||
302 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
303 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
304 goto bitmap_end_skip;
307 out_len = colormapsize * colormapbpp + linesize * height;
309 av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
310 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
312 zbuf = av_malloc(len);
313 buf = av_malloc(out_len);
315 res = AVERROR(ENOMEM);
319 len = avio_read(pb, zbuf, len);
320 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
321 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
322 goto bitmap_end_skip;
325 for (i = 0; i < s->nb_streams; i++) {
327 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
330 if (i == s->nb_streams) {
331 vst = avformat_new_stream(s, NULL);
333 res = AVERROR(ENOMEM);
336 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
337 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
338 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
339 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
342 st->codec->width = width;
343 st->codec->height = height;
345 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
348 pkt->stream_index = st->index;
352 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
353 for (i = 0; i < colormapsize; i++)
354 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
355 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
356 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
358 res = AVERROR(ENOMEM);
361 memcpy(pal, colormap, AVPALETTE_SIZE);
364 st->codec->pix_fmt = AV_PIX_FMT_RGB555;
367 st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
373 if (linesize * height > pkt->size) {
374 res = AVERROR_INVALIDDATA;
377 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
389 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
391 } else if (tag == TAG_STREAMBLOCK) {
392 for (i = 0; i < s->nb_streams; i++) {
394 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
395 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
397 if ((res = av_get_packet(pb, pkt, len-4)) < 0)
399 } else { // ADPCM, PCM
400 if ((res = av_get_packet(pb, pkt, len)) < 0)
404 pkt->stream_index = st->index;
408 } else if (tag == TAG_JPEG2) {
409 for (i=0; i<s->nb_streams; i++) {
411 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
414 if (i == s->nb_streams) {
415 vst = avformat_new_stream(s, NULL);
417 return AVERROR(ENOMEM);
418 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
419 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
420 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
421 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
424 avio_rl16(pb); /* BITMAP_ID */
425 if ((res = av_new_packet(pkt, len-2)) < 0)
427 avio_read(pb, pkt->data, 4);
428 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
429 AV_RB32(pkt->data) == 0xffd9ffd8) {
430 /* old SWF files containing SOI/EOI as data start */
431 /* files created by swink have reversed tag */
433 avio_read(pb, pkt->data, pkt->size);
435 avio_read(pb, pkt->data + 4, pkt->size - 4);
438 pkt->stream_index = st->index;
447 static av_cold int swf_read_close(AVFormatContext *avctx)
449 SWFContext *s = avctx->priv_data;
450 inflateEnd(&s->zstream);
451 av_freep(&s->zbuf_in);
452 av_freep(&s->zbuf_out);
458 AVInputFormat ff_swf_demuxer = {
460 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
461 .priv_data_size = sizeof(SWFContext),
462 .read_probe = swf_probe,
463 .read_header = swf_read_header,
464 .read_packet = swf_read_packet,
466 .read_close = swf_read_close,