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);
159 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
160 return AVERROR_INVALIDDATA;
162 if (tag == TAG_VIDEOSTREAM) {
163 int ch_id = avio_rl16(pb);
166 for (i=0; i<s->nb_streams; i++) {
168 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
177 vst = avformat_new_stream(s, NULL);
179 return AVERROR(ENOMEM);
181 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
182 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
183 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
185 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
186 /* streaming found */
187 int sample_rate_code;
189 for (i=0; i<s->nb_streams; i++) {
191 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
197 swf->samples_per_frame = avio_rl16(pb);
198 ast = avformat_new_stream(s, NULL);
200 return AVERROR(ENOMEM);
201 ast->id = -1; /* -1 to avoid clash with video stream ch_id */
203 ast->codec->channels = 2;
204 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
206 ast->codec->channels = 1;
207 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
209 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
210 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
211 ast->need_parsing = AVSTREAM_PARSE_FULL;
212 sample_rate_code= (v>>2) & 3;
213 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
214 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
216 } else if (tag == TAG_DEFINESOUND) {
218 int sample_rate_code;
219 int ch_id = avio_rl16(pb);
221 for (i=0; i<s->nb_streams; i++) {
223 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
227 // FIXME: 8-bit uncompressed PCM audio will be interpreted as 16-bit
228 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
229 // these are smaller audio streams in DEFINESOUND tags, but it's technically
230 // possible they could be huge. Break it up into multiple packets if it's big.
232 ast = avformat_new_stream(s, NULL);
234 return AVERROR(ENOMEM);
236 ast->codec->channels = 1 + (v&1);
237 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
238 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
239 ast->need_parsing = AVSTREAM_PARSE_FULL;
240 sample_rate_code= (v>>2) & 3;
241 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
242 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
243 ast->duration = avio_rl32(pb); // number of samples
244 if (((v>>4) & 15) == 2) { // MP3 sound data record
245 ast->skip_samples = avio_rl16(pb);
249 if ((res = av_get_packet(pb, pkt, len)) < 0)
252 pkt->stream_index = ast->index;
254 } else if (tag == TAG_VIDEOFRAME) {
255 int ch_id = avio_rl16(pb);
257 for(i=0; i<s->nb_streams; i++) {
259 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
260 frame = avio_rl16(pb);
264 if ((res = av_get_packet(pb, pkt, len)) < 0)
268 pkt->stream_index = st->index;
272 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
275 uint8_t *buf = NULL, *zbuf = NULL, *pal;
276 uint32_t colormap[AVPALETTE_COUNT] = {0};
277 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
278 const int colormapbpp = 3 + alpha_bmp;
279 int linesize, colormapsize = 0;
281 const int ch_id = avio_rl16(pb);
282 const int bmp_fmt = avio_r8(pb);
283 const int width = avio_rl16(pb);
284 const int height = avio_rl16(pb);
291 colormapsize = avio_r8(pb) + 1;
295 linesize = width * 2;
297 case 5: // RGB24 (0RGB)
298 linesize = width * 4;
301 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
302 goto bitmap_end_skip;
305 linesize = FFALIGN(linesize, 4);
307 if (av_image_check_size(width, height, 0, s) < 0 ||
308 linesize >= INT_MAX / height ||
309 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
310 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
311 goto bitmap_end_skip;
314 out_len = colormapsize * colormapbpp + linesize * height;
316 av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
317 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
319 zbuf = av_malloc(len);
320 buf = av_malloc(out_len);
322 res = AVERROR(ENOMEM);
326 len = avio_read(pb, zbuf, len);
327 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
328 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
329 goto bitmap_end_skip;
332 for (i = 0; i < s->nb_streams; i++) {
334 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
337 if (i == s->nb_streams) {
338 vst = avformat_new_stream(s, NULL);
340 res = AVERROR(ENOMEM);
343 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
344 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
345 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
346 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
349 st->codec->width = width;
350 st->codec->height = height;
352 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
355 pkt->stream_index = st->index;
359 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
360 for (i = 0; i < colormapsize; i++)
361 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
362 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
363 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
365 res = AVERROR(ENOMEM);
368 memcpy(pal, colormap, AVPALETTE_SIZE);
371 st->codec->pix_fmt = AV_PIX_FMT_RGB555;
374 st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
380 if (linesize * height > pkt->size) {
381 res = AVERROR_INVALIDDATA;
384 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
396 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
398 } else if (tag == TAG_STREAMBLOCK) {
399 for (i = 0; i < s->nb_streams; i++) {
401 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
402 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
407 if ((res = av_get_packet(pb, pkt, len)) < 0)
409 } else { // ADPCM, PCM
412 if ((res = av_get_packet(pb, pkt, len)) < 0)
416 pkt->stream_index = st->index;
420 } else if (tag == TAG_JPEG2) {
421 for (i=0; i<s->nb_streams; i++) {
423 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
426 if (i == s->nb_streams) {
427 vst = avformat_new_stream(s, NULL);
429 return AVERROR(ENOMEM);
430 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
431 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
432 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
433 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
436 avio_rl16(pb); /* BITMAP_ID */
440 if ((res = av_new_packet(pkt, len)) < 0)
442 avio_read(pb, pkt->data, 4);
443 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
444 AV_RB32(pkt->data) == 0xffd9ffd8) {
445 /* old SWF files containing SOI/EOI as data start */
446 /* files created by swink have reversed tag */
448 avio_read(pb, pkt->data, pkt->size);
450 avio_read(pb, pkt->data + 4, pkt->size - 4);
453 pkt->stream_index = st->index;
456 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
460 av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);
467 static av_cold int swf_read_close(AVFormatContext *avctx)
469 SWFContext *s = avctx->priv_data;
470 inflateEnd(&s->zstream);
471 av_freep(&s->zbuf_in);
472 av_freep(&s->zbuf_out);
478 AVInputFormat ff_swf_demuxer = {
480 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
481 .priv_data_size = sizeof(SWFContext),
482 .read_probe = swf_probe,
483 .read_header = swf_read_header,
484 .read_packet = swf_read_packet,
486 .read_close = swf_read_close,