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"
27 static void put_swf_tag(AVFormatContext *s, int tag)
29 SWFContext *swf = s->priv_data;
30 AVIOContext *pb = s->pb;
32 swf->tag_pos = avio_tell(pb);
34 /* reserve some room for the tag */
43 static void put_swf_end_tag(AVFormatContext *s)
45 SWFContext *swf = s->priv_data;
46 AVIOContext *pb = s->pb;
51 tag_len = pos - swf->tag_pos - 2;
53 avio_seek(pb, swf->tag_pos, SEEK_SET);
56 avio_wl16(pb, (tag << 6) | 0x3f);
57 avio_wl32(pb, tag_len - 4);
59 assert(tag_len < 0x3f);
60 avio_wl16(pb, (tag << 6) | tag_len);
62 avio_seek(pb, pos, SEEK_SET);
65 static inline void max_nbits(int *nbits_ptr, int val)
81 static void put_swf_rect(AVIOContext *pb,
82 int xmin, int xmax, int ymin, int ymax)
88 init_put_bits(&p, buf, sizeof(buf));
91 max_nbits(&nbits, xmin);
92 max_nbits(&nbits, xmax);
93 max_nbits(&nbits, ymin);
94 max_nbits(&nbits, ymax);
95 mask = (1 << nbits) - 1;
98 put_bits(&p, 5, nbits);
99 put_bits(&p, nbits, xmin & mask);
100 put_bits(&p, nbits, xmax & mask);
101 put_bits(&p, nbits, ymin & mask);
102 put_bits(&p, nbits, ymax & mask);
105 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
108 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
112 put_bits(pb, 1, 1); /* edge */
113 put_bits(pb, 1, 1); /* line select */
115 max_nbits(&nbits, dx);
116 max_nbits(&nbits, dy);
118 mask = (1 << nbits) - 1;
119 put_bits(pb, 4, nbits - 2); /* 16 bits precision */
123 put_bits(pb, nbits, dy & mask);
124 } else if (dy == 0) {
127 put_bits(pb, nbits, dx & mask);
130 put_bits(pb, nbits, dx & mask);
131 put_bits(pb, nbits, dy & mask);
137 static void put_swf_matrix(AVIOContext *pb,
138 int a, int b, int c, int d, int tx, int ty)
144 init_put_bits(&p, buf, sizeof(buf));
146 put_bits(&p, 1, 1); /* a, d present */
148 max_nbits(&nbits, a);
149 max_nbits(&nbits, d);
150 put_bits(&p, 5, nbits); /* nb bits */
151 put_bits(&p, nbits, a);
152 put_bits(&p, nbits, d);
154 put_bits(&p, 1, 1); /* b, c present */
156 max_nbits(&nbits, c);
157 max_nbits(&nbits, b);
158 put_bits(&p, 5, nbits); /* nb bits */
159 put_bits(&p, nbits, c);
160 put_bits(&p, nbits, b);
163 max_nbits(&nbits, tx);
164 max_nbits(&nbits, ty);
165 put_bits(&p, 5, nbits); /* nb bits */
166 put_bits(&p, nbits, tx);
167 put_bits(&p, nbits, ty);
170 avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
173 static int swf_write_header(AVFormatContext *s)
175 SWFContext *swf = s->priv_data;
176 AVIOContext *pb = s->pb;
179 int i, width, height, rate, rate_base;
182 swf->sound_samples = 0;
183 swf->swf_frame_number = 0;
184 swf->video_frame_number = 0;
186 for(i=0;i<s->nb_streams;i++) {
187 AVCodecContext *enc = s->streams[i]->codec;
188 if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
189 if (enc->codec_id == CODEC_ID_MP3) {
190 if (!enc->frame_size) {
191 av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
194 swf->audio_enc = enc;
195 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
196 if (!swf->audio_fifo)
197 return AVERROR(ENOMEM);
199 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
203 if (enc->codec_id == CODEC_ID_VP6F ||
204 enc->codec_id == CODEC_ID_FLV1 ||
205 enc->codec_id == CODEC_ID_MJPEG) {
206 swf->video_enc = enc;
208 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
214 if (!swf->video_enc) {
215 /* currently, cannot work correctly if audio only */
221 width = swf->video_enc->width;
222 height = swf->video_enc->height;
223 rate = swf->video_enc->time_base.den;
224 rate_base = swf->video_enc->time_base.num;
228 swf->samples_per_frame = (44100. * rate_base) / rate;
230 swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
232 avio_write(pb, "FWS", 3);
234 if (!strcmp("avm2", s->oformat->name))
236 else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_VP6F)
237 version = 8; /* version 8 and above support VP6 codec */
238 else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_FLV1)
239 version = 6; /* version 6 and above support FLV1 codec */
241 version = 4; /* version 4 for mpeg audio support */
242 avio_w8(pb, version);
244 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
245 (will be patched if not streamed) */
247 put_swf_rect(pb, 0, width * 20, 0, height * 20);
248 avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
249 swf->duration_pos = avio_tell(pb);
250 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
252 /* avm2/swf v9 (also v8?) files require a file attribute tag */
254 put_swf_tag(s, TAG_FILEATTRIBUTES);
255 avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
259 /* define a shape with the jpeg inside */
260 if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_MJPEG) {
261 put_swf_tag(s, TAG_DEFINESHAPE);
263 avio_wl16(pb, SHAPE_ID); /* ID of shape */
264 /* bounding rectangle */
265 put_swf_rect(pb, 0, width, 0, height);
267 avio_w8(pb, 1); /* one fill style */
268 avio_w8(pb, 0x41); /* clipped bitmap fill */
269 avio_wl16(pb, BITMAP_ID); /* bitmap ID */
270 /* position of the bitmap */
271 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
272 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
273 avio_w8(pb, 0); /* no line style */
276 init_put_bits(&p, buf1, sizeof(buf1));
277 put_bits(&p, 4, 1); /* one fill bit */
278 put_bits(&p, 4, 0); /* zero line bit */
280 put_bits(&p, 1, 0); /* not an edge */
281 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
282 put_bits(&p, 5, 1); /* nbits */
283 put_bits(&p, 1, 0); /* X */
284 put_bits(&p, 1, 0); /* Y */
285 put_bits(&p, 1, 1); /* set fill style 1 */
287 /* draw the rectangle ! */
288 put_swf_line_edge(&p, width, 0);
289 put_swf_line_edge(&p, 0, height);
290 put_swf_line_edge(&p, -width, 0);
291 put_swf_line_edge(&p, 0, -height);
294 put_bits(&p, 1, 0); /* not an edge */
298 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
303 if (swf->audio_enc && swf->audio_enc->codec_id == CODEC_ID_MP3) {
307 put_swf_tag(s, TAG_STREAMHEAD2);
308 switch(swf->audio_enc->sample_rate) {
309 case 11025: v |= 1 << 2; break;
310 case 22050: v |= 2 << 2; break;
311 case 44100: v |= 3 << 2; break;
314 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
317 v |= 0x02; /* 16 bit playback */
318 if (swf->audio_enc->channels == 2)
319 v |= 0x01; /* stereo playback */
321 v |= 0x20; /* mp3 compressed */
323 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
333 static int swf_write_video(AVFormatContext *s,
334 AVCodecContext *enc, const uint8_t *buf, int size)
336 SWFContext *swf = s->priv_data;
337 AVIOContext *pb = s->pb;
339 /* Flash Player limit */
340 if (swf->swf_frame_number == 16000)
341 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
343 if (enc->codec_id == CODEC_ID_VP6F ||
344 enc->codec_id == CODEC_ID_FLV1) {
345 if (swf->video_frame_number == 0) {
346 /* create a new video object */
347 put_swf_tag(s, TAG_VIDEOSTREAM);
348 avio_wl16(pb, VIDEO_ID);
349 swf->vframes_pos = avio_tell(pb);
350 avio_wl16(pb, 15000); /* hard flash player limit */
351 avio_wl16(pb, enc->width);
352 avio_wl16(pb, enc->height);
354 avio_w8(pb,ff_codec_get_tag(swf_codec_tags,enc->codec_id));
357 /* place the video object for the first time */
358 put_swf_tag(s, TAG_PLACEOBJECT2);
361 avio_wl16(pb, VIDEO_ID);
362 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
363 avio_wl16(pb, swf->video_frame_number);
364 avio_write(pb, "video", 5);
368 /* mark the character for update */
369 put_swf_tag(s, TAG_PLACEOBJECT2);
372 avio_wl16(pb, swf->video_frame_number);
376 /* set video frame data */
377 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
378 avio_wl16(pb, VIDEO_ID);
379 avio_wl16(pb, swf->video_frame_number++);
380 avio_write(pb, buf, size);
382 } else if (enc->codec_id == CODEC_ID_MJPEG) {
383 if (swf->swf_frame_number > 0) {
384 /* remove the shape */
385 put_swf_tag(s, TAG_REMOVEOBJECT);
386 avio_wl16(pb, SHAPE_ID); /* shape ID */
387 avio_wl16(pb, 1); /* depth */
390 /* free the bitmap */
391 put_swf_tag(s, TAG_FREECHARACTER);
392 avio_wl16(pb, BITMAP_ID);
396 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
398 avio_wl16(pb, BITMAP_ID); /* ID of the image */
400 /* a dummy jpeg header seems to be required */
401 avio_wb32(pb, 0xffd8ffd9);
402 /* write the jpeg image */
403 avio_write(pb, buf, size);
409 put_swf_tag(s, TAG_PLACEOBJECT);
410 avio_wl16(pb, SHAPE_ID); /* shape ID */
411 avio_wl16(pb, 1); /* depth */
412 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
416 swf->swf_frame_number++;
418 /* streaming sound always should be placed just before showframe tags */
419 if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
420 int frame_size = av_fifo_size(swf->audio_fifo);
421 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
422 avio_wl16(pb, swf->sound_samples);
423 avio_wl16(pb, 0); // seek samples
424 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
428 swf->sound_samples = 0;
431 /* output the frame */
432 put_swf_tag(s, TAG_SHOWFRAME);
440 static int swf_write_audio(AVFormatContext *s,
441 AVCodecContext *enc, uint8_t *buf, int size)
443 SWFContext *swf = s->priv_data;
445 /* Flash Player limit */
446 if (swf->swf_frame_number == 16000)
447 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
449 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
450 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
454 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
455 swf->sound_samples += enc->frame_size;
457 /* if audio only stream make sure we add swf frames */
459 swf_write_video(s, enc, 0, 0);
464 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
466 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
467 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
468 return swf_write_audio(s, codec, pkt->data, pkt->size);
470 return swf_write_video(s, codec, pkt->data, pkt->size);
473 static int swf_write_trailer(AVFormatContext *s)
475 SWFContext *swf = s->priv_data;
476 AVIOContext *pb = s->pb;
477 AVCodecContext *enc, *video_enc;
481 for(i=0;i<s->nb_streams;i++) {
482 enc = s->streams[i]->codec;
483 if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
486 av_fifo_free(swf->audio_fifo);
489 put_swf_tag(s, TAG_END);
494 /* patch file size and number of frames if not streamed */
495 if (s->pb->seekable && video_enc) {
496 file_size = avio_tell(pb);
497 avio_seek(pb, 4, SEEK_SET);
498 avio_wl32(pb, file_size);
499 avio_seek(pb, swf->duration_pos, SEEK_SET);
500 avio_wl16(pb, swf->video_frame_number);
501 avio_seek(pb, swf->vframes_pos, SEEK_SET);
502 avio_wl16(pb, swf->video_frame_number);
503 avio_seek(pb, file_size, SEEK_SET);
509 AVOutputFormat ff_swf_muxer = {
511 NULL_IF_CONFIG_SMALL("Flash format"),
512 "application/x-shockwave-flash",
522 #if CONFIG_AVM2_MUXER
523 AVOutputFormat ff_avm2_muxer = {
525 NULL_IF_CONFIG_SMALL("Flash 9 (AVM2) format"),
526 "application/x-shockwave-flash",