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 typedef struct SWFDecContext {
38 int samples_per_frame;
41 #define ZBUF_SIZE 4096
49 static const AVCodecTag swf_audio_codec_tags[] = {
50 { AV_CODEC_ID_PCM_S16LE, 0x00 },
51 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
52 { AV_CODEC_ID_MP3, 0x02 },
53 { AV_CODEC_ID_PCM_S16LE, 0x03 },
54 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
55 { AV_CODEC_ID_NONE, 0 },
58 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
76 static int swf_probe(const AVProbeData *p)
79 int len, xmin, xmax, ymin, ymax;
84 /* check file header */
85 if ( AV_RB24(p->buf) != AV_RB24("CWS")
86 && AV_RB24(p->buf) != AV_RB24("FWS"))
89 if ( AV_RB24(p->buf) == AV_RB24("CWS")
91 return AVPROBE_SCORE_MAX / 4 + 1;
93 if (init_get_bits8(&gb, p->buf + 8, p->buf_size - 8) < 0)
96 len = get_bits(&gb, 5);
99 xmin = get_bits_long(&gb, len);
100 xmax = get_bits_long(&gb, len);
101 ymin = get_bits_long(&gb, len);
102 ymax = get_bits_long(&gb, len);
103 if (xmin || ymin || !xmax || !ymax)
106 if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
107 return AVPROBE_SCORE_MAX / 4;
109 return AVPROBE_SCORE_EXTENSION + 1;
113 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
115 AVFormatContext *s = opaque;
116 SWFDecContext *swf = s->priv_data;
117 z_stream *z = &swf->zstream;
122 int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
125 z->next_in = swf->zbuf_in;
130 z->avail_out = buf_size;
132 ret = inflate(z, Z_NO_FLUSH);
133 if (ret == Z_STREAM_END)
136 return AVERROR(EINVAL);
138 if (buf_size - z->avail_out == 0)
141 return buf_size - z->avail_out;
145 static int swf_read_header(AVFormatContext *s)
147 SWFDecContext *swf = s->priv_data;
148 AVIOContext *pb = s->pb;
151 tag = avio_rb32(pb) & 0xffffff00;
154 if (tag == MKBETAG('C', 'W', 'S', 0)) {
155 av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
157 swf->zbuf_in = av_malloc(ZBUF_SIZE);
158 swf->zbuf_out = av_malloc(ZBUF_SIZE);
159 swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
160 zlib_refill, NULL, NULL);
161 if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
162 return AVERROR(ENOMEM);
163 swf->zpb->seekable = 0;
164 if (inflateInit(&swf->zstream) != Z_OK) {
165 av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
166 av_freep(&swf->zbuf_in);
167 av_freep(&swf->zbuf_out);
168 return AVERROR(EINVAL);
172 av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
175 } else if (tag != MKBETAG('F', 'W', 'S', 0))
177 /* skip rectangle size */
178 nbits = avio_r8(pb) >> 3;
179 len = (4 * nbits - 3 + 7) / 8;
181 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
182 avio_rl16(pb); /* frame count */
184 swf->samples_per_frame = 0;
185 s->ctx_flags |= AVFMTCTX_NOHEADER;
189 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
191 int sample_rate_code, sample_size_code;
192 AVStream *ast = avformat_new_stream(s, NULL);
197 ast->codecpar->channels = 2;
198 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
200 ast->codecpar->channels = 1;
201 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
203 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
204 ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
205 ast->need_parsing = AVSTREAM_PARSE_FULL;
206 sample_rate_code = info>>2 & 3;
207 sample_size_code = info>>1 & 1;
208 if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
209 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
210 ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
211 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
215 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
217 SWFDecContext *swf = s->priv_data;
218 AVIOContext *pb = s->pb;
219 AVStream *vst = NULL, *ast = NULL, *st = 0;
220 int tag, len, i, frame, v, res;
228 uint64_t pos = avio_tell(pb);
229 tag = get_swf_tag(pb, &len);
233 av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
234 return AVERROR_INVALIDDATA;
236 if (tag == TAG_VIDEOSTREAM) {
237 int ch_id = avio_rl16(pb);
240 for (i=0; i<s->nb_streams; i++) {
242 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
251 vst = avformat_new_stream(s, NULL);
253 return AVERROR(ENOMEM);
255 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
256 vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
257 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
259 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
260 /* streaming found */
262 for (i=0; i<s->nb_streams; i++) {
264 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
270 swf->samples_per_frame = avio_rl16(pb);
271 ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
273 return AVERROR(ENOMEM);
275 } else if (tag == TAG_DEFINESOUND) {
277 int ch_id = avio_rl16(pb);
279 for (i=0; i<s->nb_streams; i++) {
281 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
285 // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
286 // these are smaller audio streams in DEFINESOUND tags, but it's technically
287 // possible they could be huge. Break it up into multiple packets if it's big.
289 ast = create_new_audio_stream(s, ch_id, v);
291 return AVERROR(ENOMEM);
292 ast->duration = avio_rl32(pb); // number of samples
293 if (((v>>4) & 15) == 2) { // MP3 sound data record
294 ast->skip_samples = avio_rl16(pb);
298 if ((res = av_get_packet(pb, pkt, len)) < 0)
301 pkt->stream_index = ast->index;
303 } else if (tag == TAG_VIDEOFRAME) {
304 int ch_id = avio_rl16(pb);
306 for(i=0; i<s->nb_streams; i++) {
308 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
309 frame = avio_rl16(pb);
313 if ((res = av_get_packet(pb, pkt, len)) < 0)
317 pkt->stream_index = st->index;
321 } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
324 uint8_t *buf = NULL, *zbuf = NULL, *pal;
325 uint32_t colormap[AVPALETTE_COUNT] = {0};
326 const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
327 const int colormapbpp = 3 + alpha_bmp;
328 int linesize, colormapsize = 0;
330 const int ch_id = avio_rl16(pb);
331 const int bmp_fmt = avio_r8(pb);
332 const int width = avio_rl16(pb);
333 const int height = avio_rl16(pb);
341 colormapsize = avio_r8(pb) + 1;
345 linesize = width * 2;
347 case 5: // RGB24 (0RGB)
348 linesize = width * 4;
351 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
352 goto bitmap_end_skip;
355 linesize = FFALIGN(linesize, 4);
357 if (av_image_check_size(width, height, 0, s) < 0 ||
358 linesize >= INT_MAX / height ||
359 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
360 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
361 goto bitmap_end_skip;
364 out_len = colormapsize * colormapbpp + linesize * height;
366 ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
367 ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
369 zbuf = av_malloc(len);
370 buf = av_malloc(out_len);
372 res = AVERROR(ENOMEM);
376 len = avio_read(pb, zbuf, len);
377 if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
378 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
379 goto bitmap_end_skip;
382 for (i = 0; i < s->nb_streams; i++) {
384 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
387 if (i == s->nb_streams) {
388 vst = avformat_new_stream(s, NULL);
390 res = AVERROR(ENOMEM);
393 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
394 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
395 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
396 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
400 if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
402 if (!st->codecpar->width && !st->codecpar->height) {
403 st->codecpar->width = width;
404 st->codecpar->height = height;
406 ff_add_param_change(pkt, 0, 0, 0, width, height);
409 pkt->stream_index = st->index;
411 if (linesize * height > pkt->size) {
412 res = AVERROR_INVALIDDATA;
418 pix_fmt = AV_PIX_FMT_PAL8;
419 for (i = 0; i < colormapsize; i++)
420 if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
421 else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
422 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
424 res = AVERROR(ENOMEM);
427 memcpy(pal, colormap, AVPALETTE_SIZE);
430 pix_fmt = AV_PIX_FMT_RGB555;
433 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
438 if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
439 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
441 st->codecpar->format = pix_fmt;
443 memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
455 av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
457 } else if (tag == TAG_STREAMBLOCK) {
458 for (i = 0; i < s->nb_streams; i++) {
460 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
461 if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
466 if ((res = av_get_packet(pb, pkt, len)) < 0)
468 } else { // ADPCM, PCM
471 if ((res = av_get_packet(pb, pkt, len)) < 0)
475 pkt->stream_index = st->index;
479 } else if (tag == TAG_JPEG2) {
480 for (i=0; i<s->nb_streams; i++) {
482 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
485 if (i == s->nb_streams) {
486 vst = avformat_new_stream(s, NULL);
488 return AVERROR(ENOMEM);
489 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
490 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
491 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
492 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
495 avio_rl16(pb); /* BITMAP_ID */
499 if ((res = av_new_packet(pkt, len)) < 0)
501 if (avio_read(pb, pkt->data, 4) != 4) {
502 return AVERROR_INVALIDDATA;
504 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
505 AV_RB32(pkt->data) == 0xffd9ffd8) {
506 /* old SWF files containing SOI/EOI as data start */
507 /* files created by swink have reversed tag */
509 memset(pkt->data+pkt->size, 0, 4);
510 res = avio_read(pb, pkt->data, pkt->size);
512 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
516 if (res != pkt->size) {
520 av_shrink_packet(pkt, res);
524 pkt->stream_index = st->index;
527 av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
531 av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
538 static av_cold int swf_read_close(AVFormatContext *avctx)
540 SWFDecContext *s = avctx->priv_data;
541 inflateEnd(&s->zstream);
542 av_freep(&s->zbuf_in);
543 av_freep(&s->zbuf_out);
544 avio_context_free(&s->zpb);
549 AVInputFormat ff_swf_demuxer = {
551 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
552 .priv_data_size = sizeof(SWFDecContext),
553 .read_probe = swf_probe,
554 .read_header = swf_read_header,
555 .read_packet = swf_read_packet,
557 .read_close = swf_read_close,