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"
25 #include "libavutil/fifo.h"
29 #define AUDIO_FIFO_SIZE 65536
31 typedef struct SWFEncContext {
35 int samples_per_frame;
38 int video_frame_number;
40 AVFifoBuffer *audio_fifo;
41 AVCodecParameters *audio_par, *video_par;
45 static void put_swf_tag(AVFormatContext *s, int tag)
47 SWFEncContext *swf = s->priv_data;
48 AVIOContext *pb = s->pb;
50 swf->tag_pos = avio_tell(pb);
52 /* reserve some room for the tag */
61 static void put_swf_end_tag(AVFormatContext *s)
63 SWFEncContext *swf = s->priv_data;
64 AVIOContext *pb = s->pb;
69 tag_len = pos - swf->tag_pos - 2;
71 avio_seek(pb, swf->tag_pos, SEEK_SET);
74 avio_wl16(pb, (tag << 6) | 0x3f);
75 avio_wl32(pb, tag_len - 4);
77 av_assert0(tag_len < 0x3f);
78 avio_wl16(pb, (tag << 6) | tag_len);
80 avio_seek(pb, pos, SEEK_SET);
83 static inline void max_nbits(int *nbits_ptr, int val)
99 static void put_swf_rect(AVIOContext *pb,
100 int xmin, int xmax, int ymin, int ymax)
106 init_put_bits(&p, buf, sizeof(buf));
109 max_nbits(&nbits, xmin);
110 max_nbits(&nbits, xmax);
111 max_nbits(&nbits, ymin);
112 max_nbits(&nbits, ymax);
113 mask = (1 << nbits) - 1;
116 put_bits(&p, 5, nbits);
117 put_bits(&p, nbits, xmin & mask);
118 put_bits(&p, nbits, xmax & mask);
119 put_bits(&p, nbits, ymin & mask);
120 put_bits(&p, nbits, ymax & mask);
123 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
126 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
130 put_bits(pb, 1, 1); /* edge */
131 put_bits(pb, 1, 1); /* line select */
133 max_nbits(&nbits, dx);
134 max_nbits(&nbits, dy);
136 mask = (1 << nbits) - 1;
137 put_bits(pb, 4, nbits - 2); /* 16 bits precision */
141 put_bits(pb, nbits, dy & mask);
142 } else if (dy == 0) {
145 put_bits(pb, nbits, dx & mask);
148 put_bits(pb, nbits, dx & mask);
149 put_bits(pb, nbits, dy & mask);
155 static void put_swf_matrix(AVIOContext *pb,
156 int a, int b, int c, int d, int tx, int ty)
162 init_put_bits(&p, buf, sizeof(buf));
164 put_bits(&p, 1, 1); /* a, d present */
166 max_nbits(&nbits, a);
167 max_nbits(&nbits, d);
168 put_bits(&p, 5, nbits); /* nb bits */
169 put_bits(&p, nbits, a);
170 put_bits(&p, nbits, d);
172 put_bits(&p, 1, 1); /* b, c present */
174 max_nbits(&nbits, c);
175 max_nbits(&nbits, b);
176 put_bits(&p, 5, nbits); /* nb bits */
177 put_bits(&p, nbits, c);
178 put_bits(&p, nbits, b);
181 max_nbits(&nbits, tx);
182 max_nbits(&nbits, ty);
183 put_bits(&p, 5, nbits); /* nb bits */
184 put_bits(&p, nbits, tx);
185 put_bits(&p, nbits, ty);
188 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
191 static int swf_write_header(AVFormatContext *s)
193 SWFEncContext *swf = s->priv_data;
194 AVIOContext *pb = s->pb;
197 int i, width, height, rate, rate_base;
200 swf->sound_samples = 0;
201 swf->swf_frame_number = 0;
202 swf->video_frame_number = 0;
204 for(i=0;i<s->nb_streams;i++) {
205 AVCodecParameters *par = s->streams[i]->codecpar;
206 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
207 if (swf->audio_par) {
208 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
209 return AVERROR_INVALIDDATA;
211 if (par->codec_id == AV_CODEC_ID_MP3) {
212 swf->audio_par = par;
213 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
214 if (!swf->audio_fifo)
215 return AVERROR(ENOMEM);
217 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
221 if (swf->video_par) {
222 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
223 return AVERROR_INVALIDDATA;
225 if (par->codec_id == AV_CODEC_ID_VP6F ||
226 par->codec_id == AV_CODEC_ID_FLV1 ||
227 par->codec_id == AV_CODEC_ID_PNG ||
228 par->codec_id == AV_CODEC_ID_MJPEG) {
229 swf->video_st = s->streams[i];
230 swf->video_par = par;
232 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1, PNG and MJPEG\n");
238 if (!swf->video_par) {
239 /* currently, cannot work correctly if audio only */
245 width = swf->video_par->width;
246 height = swf->video_par->height;
247 // TODO: should be avg_frame_rate
248 rate = swf->video_st->time_base.den;
249 rate_base = swf->video_st->time_base.num;
253 swf->samples_per_frame = (44100LL * rate_base) / rate;
255 swf->samples_per_frame = (swf->audio_par->sample_rate * rate_base) / rate;
257 avio_write(pb, "FWS", 3);
259 if (!strcmp("avm2", s->oformat->name))
261 else if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_VP6F || swf->video_par->codec_id == AV_CODEC_ID_PNG))
262 version = 8; /* version 8 and above support VP6 codec */
263 else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLV1)
264 version = 6; /* version 6 and above support FLV1 codec */
266 version = 4; /* version 4 for mpeg audio support */
267 avio_w8(pb, version);
269 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
270 (will be patched if not streamed) */
272 put_swf_rect(pb, 0, width * 20, 0, height * 20);
273 if ((rate * 256LL) / rate_base >= (1<<16)) {
274 av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
275 return AVERROR(EINVAL);
277 avio_wl16(pb, (rate * 256LL) / rate_base); /* frame rate */
278 swf->duration_pos = avio_tell(pb);
279 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
281 /* swf v8 and later files require a file attribute tag */
283 put_swf_tag(s, TAG_FILEATTRIBUTES);
284 avio_wl32(pb, (version >= 9) << 3); /* set ActionScript v3/AVM2 flag */
288 /* define a shape with the jpeg inside */
289 if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_MJPEG || swf->video_par->codec_id == AV_CODEC_ID_PNG)) {
290 put_swf_tag(s, TAG_DEFINESHAPE);
292 avio_wl16(pb, SHAPE_ID); /* ID of shape */
293 /* bounding rectangle */
294 put_swf_rect(pb, 0, width, 0, height);
296 avio_w8(pb, 1); /* one fill style */
297 avio_w8(pb, 0x41); /* clipped bitmap fill */
298 avio_wl16(pb, BITMAP_ID); /* bitmap ID */
299 /* position of the bitmap */
300 put_swf_matrix(pb, 1 << FRAC_BITS, 0,
301 0, 1 << FRAC_BITS, 0, 0);
302 avio_w8(pb, 0); /* no line style */
305 init_put_bits(&p, buf1, sizeof(buf1));
306 put_bits(&p, 4, 1); /* one fill bit */
307 put_bits(&p, 4, 0); /* zero line bit */
309 put_bits(&p, 1, 0); /* not an edge */
310 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
311 put_bits(&p, 5, 1); /* nbits */
312 put_bits(&p, 1, 0); /* X */
313 put_bits(&p, 1, 0); /* Y */
314 put_bits(&p, 1, 1); /* set fill style 1 */
316 /* draw the rectangle ! */
317 put_swf_line_edge(&p, width, 0);
318 put_swf_line_edge(&p, 0, height);
319 put_swf_line_edge(&p, -width, 0);
320 put_swf_line_edge(&p, 0, -height);
323 put_bits(&p, 1, 0); /* not an edge */
327 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
332 if (swf->audio_par && swf->audio_par->codec_id == AV_CODEC_ID_MP3) {
336 put_swf_tag(s, TAG_STREAMHEAD2);
337 switch(swf->audio_par->sample_rate) {
338 case 11025: v |= 1 << 2; break;
339 case 22050: v |= 2 << 2; break;
340 case 44100: v |= 3 << 2; break;
343 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
346 v |= 0x02; /* 16 bit playback */
347 if (swf->audio_par->channels == 2)
348 v |= 0x01; /* stereo playback */
350 v |= 0x20; /* mp3 compressed */
352 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
361 static int swf_write_video(AVFormatContext *s,
362 AVCodecParameters *par, const uint8_t *buf, int size)
364 SWFEncContext *swf = s->priv_data;
365 AVIOContext *pb = s->pb;
367 /* Flash Player limit */
368 if (swf->swf_frame_number == 16000)
369 av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
371 if (par->codec_id == AV_CODEC_ID_VP6F ||
372 par->codec_id == AV_CODEC_ID_FLV1) {
373 if (swf->video_frame_number == 0) {
374 /* create a new video object */
375 put_swf_tag(s, TAG_VIDEOSTREAM);
376 avio_wl16(pb, VIDEO_ID);
377 swf->vframes_pos = avio_tell(pb);
378 avio_wl16(pb, 15000); /* hard flash player limit */
379 avio_wl16(pb, par->width);
380 avio_wl16(pb, par->height);
382 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, par->codec_id));
385 /* place the video object for the first time */
386 put_swf_tag(s, TAG_PLACEOBJECT2);
389 avio_wl16(pb, VIDEO_ID);
390 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
391 avio_wl16(pb, swf->video_frame_number);
392 avio_write(pb, "video", 5);
396 /* mark the character for update */
397 put_swf_tag(s, TAG_PLACEOBJECT2);
400 avio_wl16(pb, swf->video_frame_number);
404 /* set video frame data */
405 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
406 avio_wl16(pb, VIDEO_ID);
407 avio_wl16(pb, swf->video_frame_number++);
408 avio_write(pb, buf, size);
410 } else if (par->codec_id == AV_CODEC_ID_MJPEG || par->codec_id == AV_CODEC_ID_PNG) {
411 if (swf->swf_frame_number > 0) {
412 /* remove the shape */
413 put_swf_tag(s, TAG_REMOVEOBJECT);
414 avio_wl16(pb, SHAPE_ID); /* shape ID */
415 avio_wl16(pb, 1); /* depth */
418 /* free the bitmap */
419 put_swf_tag(s, TAG_FREECHARACTER);
420 avio_wl16(pb, BITMAP_ID);
424 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
426 avio_wl16(pb, BITMAP_ID); /* ID of the image */
428 /* a dummy jpeg header seems to be required */
429 if (par->codec_id == AV_CODEC_ID_MJPEG)
430 avio_wb32(pb, 0xffd8ffd9);
431 /* write the jpeg/png image */
432 avio_write(pb, buf, size);
438 put_swf_tag(s, TAG_PLACEOBJECT);
439 avio_wl16(pb, SHAPE_ID); /* shape ID */
440 avio_wl16(pb, 1); /* depth */
441 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
445 swf->swf_frame_number++;
447 /* streaming sound always should be placed just before showframe tags */
448 if (swf->audio_par && av_fifo_size(swf->audio_fifo)) {
449 int frame_size = av_fifo_size(swf->audio_fifo);
450 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
451 avio_wl16(pb, swf->sound_samples);
452 avio_wl16(pb, 0); // seek samples
453 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
457 swf->sound_samples = 0;
460 /* output the frame */
461 put_swf_tag(s, TAG_SHOWFRAME);
467 static int swf_write_audio(AVFormatContext *s,
468 AVCodecParameters *par, uint8_t *buf, int size)
470 SWFEncContext *swf = s->priv_data;
472 /* Flash Player limit */
473 if (swf->swf_frame_number == 16000)
474 av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
476 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
477 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
481 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
482 swf->sound_samples += av_get_audio_frame_duration2(par, size);
484 /* if audio only stream make sure we add swf frames */
486 swf_write_video(s, par, 0, 0);
491 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
493 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
494 if (par->codec_type == AVMEDIA_TYPE_AUDIO)
495 return swf_write_audio(s, par, pkt->data, pkt->size);
497 return swf_write_video(s, par, pkt->data, pkt->size);
500 static int swf_write_trailer(AVFormatContext *s)
502 SWFEncContext *swf = s->priv_data;
503 AVIOContext *pb = s->pb;
506 put_swf_tag(s, TAG_END);
509 /* patch file size and number of frames if not streamed */
510 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && swf->video_par) {
511 file_size = avio_tell(pb);
512 avio_seek(pb, 4, SEEK_SET);
513 avio_wl32(pb, file_size);
514 avio_seek(pb, swf->duration_pos, SEEK_SET);
515 avio_wl16(pb, swf->video_frame_number);
516 if (swf->vframes_pos) {
517 avio_seek(pb, swf->vframes_pos, SEEK_SET);
518 avio_wl16(pb, swf->video_frame_number);
520 avio_seek(pb, file_size, SEEK_SET);
525 static void swf_deinit(AVFormatContext *s)
527 SWFEncContext *swf = s->priv_data;
529 av_fifo_freep(&swf->audio_fifo);
533 AVOutputFormat ff_swf_muxer = {
535 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
536 .mime_type = "application/x-shockwave-flash",
538 .priv_data_size = sizeof(SWFEncContext),
539 .audio_codec = AV_CODEC_ID_MP3,
540 .video_codec = AV_CODEC_ID_FLV1,
541 .write_header = swf_write_header,
542 .write_packet = swf_write_packet,
543 .write_trailer = swf_write_trailer,
544 .deinit = swf_deinit,
545 .flags = AVFMT_TS_NONSTRICT,
548 #if CONFIG_AVM2_MUXER
549 AVOutputFormat ff_avm2_muxer = {
551 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
552 .mime_type = "application/x-shockwave-flash",
553 .priv_data_size = sizeof(SWFEncContext),
554 .audio_codec = AV_CODEC_ID_MP3,
555 .video_codec = AV_CODEC_ID_FLV1,
556 .write_header = swf_write_header,
557 .write_packet = swf_write_packet,
558 .write_trailer = swf_write_trailer,
559 .deinit = swf_deinit,
560 .flags = AVFMT_TS_NONSTRICT,