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 (enc->codec_id == AV_CODEC_ID_MP3) {
191 swf->audio_enc = enc;
192 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
193 if (!swf->audio_fifo)
194 return AVERROR(ENOMEM);
196 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
200 if (enc->codec_id == AV_CODEC_ID_VP6F ||
201 enc->codec_id == AV_CODEC_ID_FLV1 ||
202 enc->codec_id == AV_CODEC_ID_MJPEG) {
203 swf->video_enc = enc;
205 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
211 if (!swf->video_enc) {
212 /* currently, cannot work correctly if audio only */
218 width = swf->video_enc->width;
219 height = swf->video_enc->height;
220 rate = swf->video_enc->time_base.den;
221 rate_base = swf->video_enc->time_base.num;
225 swf->samples_per_frame = (44100. * rate_base) / rate;
227 swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
229 avio_write(pb, "FWS", 3);
231 if (!strcmp("avm2", s->oformat->name))
233 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
234 version = 8; /* version 8 and above support VP6 codec */
235 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
236 version = 6; /* version 6 and above support FLV1 codec */
238 version = 4; /* version 4 for mpeg audio support */
239 avio_w8(pb, version);
241 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
242 (will be patched if not streamed) */
244 put_swf_rect(pb, 0, width * 20, 0, height * 20);
245 avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
246 swf->duration_pos = avio_tell(pb);
247 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
249 /* avm2/swf v9 (also v8?) files require a file attribute tag */
251 put_swf_tag(s, TAG_FILEATTRIBUTES);
252 avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
256 /* define a shape with the jpeg inside */
257 if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
258 put_swf_tag(s, TAG_DEFINESHAPE);
260 avio_wl16(pb, SHAPE_ID); /* ID of shape */
261 /* bounding rectangle */
262 put_swf_rect(pb, 0, width, 0, height);
264 avio_w8(pb, 1); /* one fill style */
265 avio_w8(pb, 0x41); /* clipped bitmap fill */
266 avio_wl16(pb, BITMAP_ID); /* bitmap ID */
267 /* position of the bitmap */
268 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
269 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
270 avio_w8(pb, 0); /* no line style */
273 init_put_bits(&p, buf1, sizeof(buf1));
274 put_bits(&p, 4, 1); /* one fill bit */
275 put_bits(&p, 4, 0); /* zero line bit */
277 put_bits(&p, 1, 0); /* not an edge */
278 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
279 put_bits(&p, 5, 1); /* nbits */
280 put_bits(&p, 1, 0); /* X */
281 put_bits(&p, 1, 0); /* Y */
282 put_bits(&p, 1, 1); /* set fill style 1 */
284 /* draw the rectangle ! */
285 put_swf_line_edge(&p, width, 0);
286 put_swf_line_edge(&p, 0, height);
287 put_swf_line_edge(&p, -width, 0);
288 put_swf_line_edge(&p, 0, -height);
291 put_bits(&p, 1, 0); /* not an edge */
295 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
300 if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) {
304 put_swf_tag(s, TAG_STREAMHEAD2);
305 switch(swf->audio_enc->sample_rate) {
306 case 11025: v |= 1 << 2; break;
307 case 22050: v |= 2 << 2; break;
308 case 44100: v |= 3 << 2; break;
311 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
314 v |= 0x02; /* 16 bit playback */
315 if (swf->audio_enc->channels == 2)
316 v |= 0x01; /* stereo playback */
318 v |= 0x20; /* mp3 compressed */
320 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
330 static int swf_write_video(AVFormatContext *s,
331 AVCodecContext *enc, const uint8_t *buf, int size)
333 SWFContext *swf = s->priv_data;
334 AVIOContext *pb = s->pb;
336 /* Flash Player limit */
337 if (swf->swf_frame_number == 16000)
338 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
340 if (enc->codec_id == AV_CODEC_ID_VP6F ||
341 enc->codec_id == AV_CODEC_ID_FLV1) {
342 if (swf->video_frame_number == 0) {
343 /* create a new video object */
344 put_swf_tag(s, TAG_VIDEOSTREAM);
345 avio_wl16(pb, VIDEO_ID);
346 swf->vframes_pos = avio_tell(pb);
347 avio_wl16(pb, 15000); /* hard flash player limit */
348 avio_wl16(pb, enc->width);
349 avio_wl16(pb, enc->height);
351 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id));
354 /* place the video object for the first time */
355 put_swf_tag(s, TAG_PLACEOBJECT2);
358 avio_wl16(pb, VIDEO_ID);
359 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
360 avio_wl16(pb, swf->video_frame_number);
361 avio_write(pb, "video", 5);
365 /* mark the character for update */
366 put_swf_tag(s, TAG_PLACEOBJECT2);
369 avio_wl16(pb, swf->video_frame_number);
373 /* set video frame data */
374 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
375 avio_wl16(pb, VIDEO_ID);
376 avio_wl16(pb, swf->video_frame_number++);
377 avio_write(pb, buf, size);
379 } else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
380 if (swf->swf_frame_number > 0) {
381 /* remove the shape */
382 put_swf_tag(s, TAG_REMOVEOBJECT);
383 avio_wl16(pb, SHAPE_ID); /* shape ID */
384 avio_wl16(pb, 1); /* depth */
387 /* free the bitmap */
388 put_swf_tag(s, TAG_FREECHARACTER);
389 avio_wl16(pb, BITMAP_ID);
393 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
395 avio_wl16(pb, BITMAP_ID); /* ID of the image */
397 /* a dummy jpeg header seems to be required */
398 avio_wb32(pb, 0xffd8ffd9);
399 /* write the jpeg image */
400 avio_write(pb, buf, size);
406 put_swf_tag(s, TAG_PLACEOBJECT);
407 avio_wl16(pb, SHAPE_ID); /* shape ID */
408 avio_wl16(pb, 1); /* depth */
409 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
413 swf->swf_frame_number++;
415 /* streaming sound always should be placed just before showframe tags */
416 if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
417 int frame_size = av_fifo_size(swf->audio_fifo);
418 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
419 avio_wl16(pb, swf->sound_samples);
420 avio_wl16(pb, 0); // seek samples
421 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
425 swf->sound_samples = 0;
428 /* output the frame */
429 put_swf_tag(s, TAG_SHOWFRAME);
437 static int swf_write_audio(AVFormatContext *s,
438 AVCodecContext *enc, uint8_t *buf, int size)
440 SWFContext *swf = s->priv_data;
442 /* Flash Player limit */
443 if (swf->swf_frame_number == 16000)
444 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
446 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
447 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
451 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
452 swf->sound_samples += av_get_audio_frame_duration(enc, size);
454 /* if audio only stream make sure we add swf frames */
456 swf_write_video(s, enc, 0, 0);
461 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
463 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
464 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
465 return swf_write_audio(s, codec, pkt->data, pkt->size);
467 return swf_write_video(s, codec, pkt->data, pkt->size);
470 static int swf_write_trailer(AVFormatContext *s)
472 SWFContext *swf = s->priv_data;
473 AVIOContext *pb = s->pb;
474 AVCodecContext *enc, *video_enc;
478 for(i=0;i<s->nb_streams;i++) {
479 enc = s->streams[i]->codec;
480 if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
483 av_fifo_free(swf->audio_fifo);
486 put_swf_tag(s, TAG_END);
491 /* patch file size and number of frames if not streamed */
492 if (s->pb->seekable && video_enc) {
493 file_size = avio_tell(pb);
494 avio_seek(pb, 4, SEEK_SET);
495 avio_wl32(pb, file_size);
496 avio_seek(pb, swf->duration_pos, SEEK_SET);
497 avio_wl16(pb, swf->video_frame_number);
498 if (swf->vframes_pos) {
499 avio_seek(pb, swf->vframes_pos, SEEK_SET);
500 avio_wl16(pb, swf->video_frame_number);
502 avio_seek(pb, file_size, SEEK_SET);
508 AVOutputFormat ff_swf_muxer = {
510 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
511 .mime_type = "application/x-shockwave-flash",
513 .priv_data_size = sizeof(SWFContext),
514 .audio_codec = AV_CODEC_ID_MP3,
515 .video_codec = AV_CODEC_ID_FLV1,
516 .write_header = swf_write_header,
517 .write_packet = swf_write_packet,
518 .write_trailer = swf_write_trailer,
519 .flags = AVFMT_TS_NONSTRICT,
522 #if CONFIG_AVM2_MUXER
523 AVOutputFormat ff_avm2_muxer = {
525 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
526 .mime_type = "application/x-shockwave-flash",
527 .priv_data_size = sizeof(SWFContext),
528 .audio_codec = AV_CODEC_ID_MP3,
529 .video_codec = AV_CODEC_ID_FLV1,
530 .write_header = swf_write_header,
531 .write_packet = swf_write_packet,
532 .write_trailer = swf_write_trailer,
533 .flags = AVFMT_TS_NONSTRICT,