2 * Flash Compatible Streaming Format muxer
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 "libavcodec/put_bits.h"
24 #include "libavutil/avassert.h"
28 static void put_swf_tag(AVFormatContext *s, int tag)
30 SWFContext *swf = s->priv_data;
31 AVIOContext *pb = s->pb;
33 swf->tag_pos = avio_tell(pb);
35 /* reserve some room for the tag */
44 static void put_swf_end_tag(AVFormatContext *s)
46 SWFContext *swf = s->priv_data;
47 AVIOContext *pb = s->pb;
52 tag_len = pos - swf->tag_pos - 2;
54 avio_seek(pb, swf->tag_pos, SEEK_SET);
57 avio_wl16(pb, (tag << 6) | 0x3f);
58 avio_wl32(pb, tag_len - 4);
60 av_assert0(tag_len < 0x3f);
61 avio_wl16(pb, (tag << 6) | tag_len);
63 avio_seek(pb, pos, SEEK_SET);
66 static inline void max_nbits(int *nbits_ptr, int val)
82 static void put_swf_rect(AVIOContext *pb,
83 int xmin, int xmax, int ymin, int ymax)
89 init_put_bits(&p, buf, sizeof(buf));
92 max_nbits(&nbits, xmin);
93 max_nbits(&nbits, xmax);
94 max_nbits(&nbits, ymin);
95 max_nbits(&nbits, ymax);
96 mask = (1 << nbits) - 1;
99 put_bits(&p, 5, nbits);
100 put_bits(&p, nbits, xmin & mask);
101 put_bits(&p, nbits, xmax & mask);
102 put_bits(&p, nbits, ymin & mask);
103 put_bits(&p, nbits, ymax & mask);
106 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
109 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
113 put_bits(pb, 1, 1); /* edge */
114 put_bits(pb, 1, 1); /* line select */
116 max_nbits(&nbits, dx);
117 max_nbits(&nbits, dy);
119 mask = (1 << nbits) - 1;
120 put_bits(pb, 4, nbits - 2); /* 16 bits precision */
124 put_bits(pb, nbits, dy & mask);
125 } else if (dy == 0) {
128 put_bits(pb, nbits, dx & mask);
131 put_bits(pb, nbits, dx & mask);
132 put_bits(pb, nbits, dy & mask);
138 static void put_swf_matrix(AVIOContext *pb,
139 int a, int b, int c, int d, int tx, int ty)
145 init_put_bits(&p, buf, sizeof(buf));
147 put_bits(&p, 1, 1); /* a, d present */
149 max_nbits(&nbits, a);
150 max_nbits(&nbits, d);
151 put_bits(&p, 5, nbits); /* nb bits */
152 put_bits(&p, nbits, a);
153 put_bits(&p, nbits, d);
155 put_bits(&p, 1, 1); /* b, c present */
157 max_nbits(&nbits, c);
158 max_nbits(&nbits, b);
159 put_bits(&p, 5, nbits); /* nb bits */
160 put_bits(&p, nbits, c);
161 put_bits(&p, nbits, b);
164 max_nbits(&nbits, tx);
165 max_nbits(&nbits, ty);
166 put_bits(&p, 5, nbits); /* nb bits */
167 put_bits(&p, nbits, tx);
168 put_bits(&p, nbits, ty);
171 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
174 static int swf_write_header(AVFormatContext *s)
176 SWFContext *swf = s->priv_data;
177 AVIOContext *pb = s->pb;
180 int i, width, height, rate, rate_base;
183 swf->sound_samples = 0;
184 swf->swf_frame_number = 0;
185 swf->video_frame_number = 0;
187 for(i=0;i<s->nb_streams;i++) {
188 AVCodecContext *enc = s->streams[i]->codec;
189 if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
190 if (swf->audio_enc) {
191 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
192 return AVERROR_INVALIDDATA;
194 if (enc->codec_id == AV_CODEC_ID_MP3) {
195 if (!enc->frame_size) {
196 av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
199 swf->audio_enc = enc;
200 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
201 if (!swf->audio_fifo)
202 return AVERROR(ENOMEM);
204 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
208 if (swf->video_enc) {
209 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
210 return AVERROR_INVALIDDATA;
212 if (enc->codec_id == AV_CODEC_ID_VP6F ||
213 enc->codec_id == AV_CODEC_ID_FLV1 ||
214 enc->codec_id == AV_CODEC_ID_MJPEG) {
215 swf->video_st = s->streams[i];
216 swf->video_enc = enc;
218 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
224 if (!swf->video_enc) {
225 /* currently, cannot work correctly if audio only */
231 width = swf->video_enc->width;
232 height = swf->video_enc->height;
233 // TODO: should be avg_frame_rate
234 rate = swf->video_st->time_base.den;
235 rate_base = swf->video_st->time_base.num;
239 swf->samples_per_frame = (44100LL * rate_base) / rate;
241 swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
243 avio_write(pb, "FWS", 3);
245 if (!strcmp("avm2", s->oformat->name))
247 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
248 version = 8; /* version 8 and above support VP6 codec */
249 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
250 version = 6; /* version 6 and above support FLV1 codec */
252 version = 4; /* version 4 for mpeg audio support */
253 avio_w8(pb, version);
255 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
256 (will be patched if not streamed) */
258 put_swf_rect(pb, 0, width * 20, 0, height * 20);
259 if ((rate * 256LL) / rate_base >= (1<<16)) {
260 av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
261 return AVERROR(EINVAL);
263 avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
264 swf->duration_pos = avio_tell(pb);
265 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
267 /* avm2/swf v9 (also v8?) files require a file attribute tag */
269 put_swf_tag(s, TAG_FILEATTRIBUTES);
270 avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
274 /* define a shape with the jpeg inside */
275 if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
276 put_swf_tag(s, TAG_DEFINESHAPE);
278 avio_wl16(pb, SHAPE_ID); /* ID of shape */
279 /* bounding rectangle */
280 put_swf_rect(pb, 0, width, 0, height);
282 avio_w8(pb, 1); /* one fill style */
283 avio_w8(pb, 0x41); /* clipped bitmap fill */
284 avio_wl16(pb, BITMAP_ID); /* bitmap ID */
285 /* position of the bitmap */
286 put_swf_matrix(pb, 1 << FRAC_BITS, 0,
287 0, 1 << FRAC_BITS, 0, 0);
288 avio_w8(pb, 0); /* no line style */
291 init_put_bits(&p, buf1, sizeof(buf1));
292 put_bits(&p, 4, 1); /* one fill bit */
293 put_bits(&p, 4, 0); /* zero line bit */
295 put_bits(&p, 1, 0); /* not an edge */
296 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
297 put_bits(&p, 5, 1); /* nbits */
298 put_bits(&p, 1, 0); /* X */
299 put_bits(&p, 1, 0); /* Y */
300 put_bits(&p, 1, 1); /* set fill style 1 */
302 /* draw the rectangle ! */
303 put_swf_line_edge(&p, width, 0);
304 put_swf_line_edge(&p, 0, height);
305 put_swf_line_edge(&p, -width, 0);
306 put_swf_line_edge(&p, 0, -height);
309 put_bits(&p, 1, 0); /* not an edge */
313 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
318 if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) {
322 put_swf_tag(s, TAG_STREAMHEAD2);
323 switch(swf->audio_enc->sample_rate) {
324 case 11025: v |= 1 << 2; break;
325 case 22050: v |= 2 << 2; break;
326 case 44100: v |= 3 << 2; break;
329 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
332 v |= 0x02; /* 16 bit playback */
333 if (swf->audio_enc->channels == 2)
334 v |= 0x01; /* stereo playback */
336 v |= 0x20; /* mp3 compressed */
338 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
348 static int swf_write_video(AVFormatContext *s,
349 AVCodecContext *enc, const uint8_t *buf, int size)
351 SWFContext *swf = s->priv_data;
352 AVIOContext *pb = s->pb;
354 /* Flash Player limit */
355 if (swf->swf_frame_number == 16000)
356 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
358 if (enc->codec_id == AV_CODEC_ID_VP6F ||
359 enc->codec_id == AV_CODEC_ID_FLV1) {
360 if (swf->video_frame_number == 0) {
361 /* create a new video object */
362 put_swf_tag(s, TAG_VIDEOSTREAM);
363 avio_wl16(pb, VIDEO_ID);
364 swf->vframes_pos = avio_tell(pb);
365 avio_wl16(pb, 15000); /* hard flash player limit */
366 avio_wl16(pb, enc->width);
367 avio_wl16(pb, enc->height);
369 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id));
372 /* place the video object for the first time */
373 put_swf_tag(s, TAG_PLACEOBJECT2);
376 avio_wl16(pb, VIDEO_ID);
377 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
378 avio_wl16(pb, swf->video_frame_number);
379 avio_write(pb, "video", 5);
383 /* mark the character for update */
384 put_swf_tag(s, TAG_PLACEOBJECT2);
387 avio_wl16(pb, swf->video_frame_number);
391 /* set video frame data */
392 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
393 avio_wl16(pb, VIDEO_ID);
394 avio_wl16(pb, swf->video_frame_number++);
395 avio_write(pb, buf, size);
397 } else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
398 if (swf->swf_frame_number > 0) {
399 /* remove the shape */
400 put_swf_tag(s, TAG_REMOVEOBJECT);
401 avio_wl16(pb, SHAPE_ID); /* shape ID */
402 avio_wl16(pb, 1); /* depth */
405 /* free the bitmap */
406 put_swf_tag(s, TAG_FREECHARACTER);
407 avio_wl16(pb, BITMAP_ID);
411 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
413 avio_wl16(pb, BITMAP_ID); /* ID of the image */
415 /* a dummy jpeg header seems to be required */
416 avio_wb32(pb, 0xffd8ffd9);
417 /* write the jpeg image */
418 avio_write(pb, buf, size);
424 put_swf_tag(s, TAG_PLACEOBJECT);
425 avio_wl16(pb, SHAPE_ID); /* shape ID */
426 avio_wl16(pb, 1); /* depth */
427 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
431 swf->swf_frame_number++;
433 /* streaming sound always should be placed just before showframe tags */
434 if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
435 int frame_size = av_fifo_size(swf->audio_fifo);
436 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
437 avio_wl16(pb, swf->sound_samples);
438 avio_wl16(pb, 0); // seek samples
439 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
443 swf->sound_samples = 0;
446 /* output the frame */
447 put_swf_tag(s, TAG_SHOWFRAME);
453 static int swf_write_audio(AVFormatContext *s,
454 AVCodecContext *enc, uint8_t *buf, int size)
456 SWFContext *swf = s->priv_data;
458 /* Flash Player limit */
459 if (swf->swf_frame_number == 16000)
460 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
462 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
463 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
467 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
468 swf->sound_samples += enc->frame_size;
470 /* if audio only stream make sure we add swf frames */
472 swf_write_video(s, enc, 0, 0);
477 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
479 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
480 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
481 return swf_write_audio(s, codec, pkt->data, pkt->size);
483 return swf_write_video(s, codec, pkt->data, pkt->size);
486 static int swf_write_trailer(AVFormatContext *s)
488 SWFContext *swf = s->priv_data;
489 AVIOContext *pb = s->pb;
490 AVCodecContext *enc, *video_enc;
494 for(i=0;i<s->nb_streams;i++) {
495 enc = s->streams[i]->codec;
496 if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
499 av_fifo_freep(&swf->audio_fifo);
503 put_swf_tag(s, TAG_END);
506 /* patch file size and number of frames if not streamed */
507 if (s->pb->seekable && video_enc) {
508 file_size = avio_tell(pb);
509 avio_seek(pb, 4, SEEK_SET);
510 avio_wl32(pb, file_size);
511 avio_seek(pb, swf->duration_pos, SEEK_SET);
512 avio_wl16(pb, swf->video_frame_number);
513 if (swf->vframes_pos) {
514 avio_seek(pb, swf->vframes_pos, SEEK_SET);
515 avio_wl16(pb, swf->video_frame_number);
517 avio_seek(pb, file_size, SEEK_SET);
523 AVOutputFormat ff_swf_muxer = {
525 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
526 .mime_type = "application/x-shockwave-flash",
528 .priv_data_size = sizeof(SWFContext),
529 .audio_codec = AV_CODEC_ID_MP3,
530 .video_codec = AV_CODEC_ID_FLV1,
531 .write_header = swf_write_header,
532 .write_packet = swf_write_packet,
533 .write_trailer = swf_write_trailer,
534 .flags = AVFMT_TS_NONSTRICT,
537 #if CONFIG_AVM2_MUXER
538 AVOutputFormat ff_avm2_muxer = {
540 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
541 .mime_type = "application/x-shockwave-flash",
542 .priv_data_size = sizeof(SWFContext),
543 .audio_codec = AV_CODEC_ID_MP3,
544 .video_codec = AV_CODEC_ID_FLV1,
545 .write_header = swf_write_header,
546 .write_packet = swf_write_packet,
547 .write_trailer = swf_write_trailer,
548 .flags = AVFMT_TS_NONSTRICT,