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_enc = enc;
217 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
223 if (!swf->video_enc) {
224 /* currently, cannot work correctly if audio only */
230 width = swf->video_enc->width;
231 height = swf->video_enc->height;
232 rate = swf->video_enc->time_base.den;
233 rate_base = swf->video_enc->time_base.num;
237 swf->samples_per_frame = (44100.0 * rate_base) / rate;
239 swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
241 avio_write(pb, "FWS", 3);
243 if (!strcmp("avm2", s->oformat->name))
245 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
246 version = 8; /* version 8 and above support VP6 codec */
247 else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
248 version = 6; /* version 6 and above support FLV1 codec */
250 version = 4; /* version 4 for mpeg audio support */
251 avio_w8(pb, version);
253 avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
254 (will be patched if not streamed) */
256 put_swf_rect(pb, 0, width * 20, 0, height * 20);
257 avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
258 swf->duration_pos = avio_tell(pb);
259 avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
261 /* avm2/swf v9 (also v8?) files require a file attribute tag */
263 put_swf_tag(s, TAG_FILEATTRIBUTES);
264 avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
268 /* define a shape with the jpeg inside */
269 if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
270 put_swf_tag(s, TAG_DEFINESHAPE);
272 avio_wl16(pb, SHAPE_ID); /* ID of shape */
273 /* bounding rectangle */
274 put_swf_rect(pb, 0, width, 0, height);
276 avio_w8(pb, 1); /* one fill style */
277 avio_w8(pb, 0x41); /* clipped bitmap fill */
278 avio_wl16(pb, BITMAP_ID); /* bitmap ID */
279 /* position of the bitmap */
280 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
281 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
282 avio_w8(pb, 0); /* no line style */
285 init_put_bits(&p, buf1, sizeof(buf1));
286 put_bits(&p, 4, 1); /* one fill bit */
287 put_bits(&p, 4, 0); /* zero line bit */
289 put_bits(&p, 1, 0); /* not an edge */
290 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
291 put_bits(&p, 5, 1); /* nbits */
292 put_bits(&p, 1, 0); /* X */
293 put_bits(&p, 1, 0); /* Y */
294 put_bits(&p, 1, 1); /* set fill style 1 */
296 /* draw the rectangle ! */
297 put_swf_line_edge(&p, width, 0);
298 put_swf_line_edge(&p, 0, height);
299 put_swf_line_edge(&p, -width, 0);
300 put_swf_line_edge(&p, 0, -height);
303 put_bits(&p, 1, 0); /* not an edge */
307 avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
312 if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) {
316 put_swf_tag(s, TAG_STREAMHEAD2);
317 switch(swf->audio_enc->sample_rate) {
318 case 11025: v |= 1 << 2; break;
319 case 22050: v |= 2 << 2; break;
320 case 44100: v |= 3 << 2; break;
323 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
326 v |= 0x02; /* 16 bit playback */
327 if (swf->audio_enc->channels == 2)
328 v |= 0x01; /* stereo playback */
330 v |= 0x20; /* mp3 compressed */
332 avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
342 static int swf_write_video(AVFormatContext *s,
343 AVCodecContext *enc, const uint8_t *buf, int size)
345 SWFContext *swf = s->priv_data;
346 AVIOContext *pb = s->pb;
348 /* Flash Player limit */
349 if (swf->swf_frame_number == 16000)
350 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
352 if (enc->codec_id == AV_CODEC_ID_VP6F ||
353 enc->codec_id == AV_CODEC_ID_FLV1) {
354 if (swf->video_frame_number == 0) {
355 /* create a new video object */
356 put_swf_tag(s, TAG_VIDEOSTREAM);
357 avio_wl16(pb, VIDEO_ID);
358 swf->vframes_pos = avio_tell(pb);
359 avio_wl16(pb, 15000); /* hard flash player limit */
360 avio_wl16(pb, enc->width);
361 avio_wl16(pb, enc->height);
363 avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id));
366 /* place the video object for the first time */
367 put_swf_tag(s, TAG_PLACEOBJECT2);
370 avio_wl16(pb, VIDEO_ID);
371 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
372 avio_wl16(pb, swf->video_frame_number);
373 avio_write(pb, "video", 5);
377 /* mark the character for update */
378 put_swf_tag(s, TAG_PLACEOBJECT2);
381 avio_wl16(pb, swf->video_frame_number);
385 /* set video frame data */
386 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
387 avio_wl16(pb, VIDEO_ID);
388 avio_wl16(pb, swf->video_frame_number++);
389 avio_write(pb, buf, size);
391 } else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
392 if (swf->swf_frame_number > 0) {
393 /* remove the shape */
394 put_swf_tag(s, TAG_REMOVEOBJECT);
395 avio_wl16(pb, SHAPE_ID); /* shape ID */
396 avio_wl16(pb, 1); /* depth */
399 /* free the bitmap */
400 put_swf_tag(s, TAG_FREECHARACTER);
401 avio_wl16(pb, BITMAP_ID);
405 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
407 avio_wl16(pb, BITMAP_ID); /* ID of the image */
409 /* a dummy jpeg header seems to be required */
410 avio_wb32(pb, 0xffd8ffd9);
411 /* write the jpeg image */
412 avio_write(pb, buf, size);
418 put_swf_tag(s, TAG_PLACEOBJECT);
419 avio_wl16(pb, SHAPE_ID); /* shape ID */
420 avio_wl16(pb, 1); /* depth */
421 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
425 swf->swf_frame_number++;
427 /* streaming sound always should be placed just before showframe tags */
428 if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
429 int frame_size = av_fifo_size(swf->audio_fifo);
430 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
431 avio_wl16(pb, swf->sound_samples);
432 avio_wl16(pb, 0); // seek samples
433 av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
437 swf->sound_samples = 0;
440 /* output the frame */
441 put_swf_tag(s, TAG_SHOWFRAME);
447 static int swf_write_audio(AVFormatContext *s,
448 AVCodecContext *enc, uint8_t *buf, int size)
450 SWFContext *swf = s->priv_data;
452 /* Flash Player limit */
453 if (swf->swf_frame_number == 16000)
454 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
456 if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
457 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
461 av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
462 swf->sound_samples += enc->frame_size;
464 /* if audio only stream make sure we add swf frames */
466 swf_write_video(s, enc, 0, 0);
471 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
473 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
474 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
475 return swf_write_audio(s, codec, pkt->data, pkt->size);
477 return swf_write_video(s, codec, pkt->data, pkt->size);
480 static int swf_write_trailer(AVFormatContext *s)
482 SWFContext *swf = s->priv_data;
483 AVIOContext *pb = s->pb;
484 AVCodecContext *enc, *video_enc;
488 for(i=0;i<s->nb_streams;i++) {
489 enc = s->streams[i]->codec;
490 if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
493 av_fifo_free(swf->audio_fifo);
494 swf->audio_fifo = NULL;
498 put_swf_tag(s, TAG_END);
501 /* patch file size and number of frames if not streamed */
502 if (s->pb->seekable && video_enc) {
503 file_size = avio_tell(pb);
504 avio_seek(pb, 4, SEEK_SET);
505 avio_wl32(pb, file_size);
506 avio_seek(pb, swf->duration_pos, SEEK_SET);
507 avio_wl16(pb, swf->video_frame_number);
508 if (swf->vframes_pos) {
509 avio_seek(pb, swf->vframes_pos, SEEK_SET);
510 avio_wl16(pb, swf->video_frame_number);
512 avio_seek(pb, file_size, SEEK_SET);
518 AVOutputFormat ff_swf_muxer = {
520 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
521 .mime_type = "application/x-shockwave-flash",
523 .priv_data_size = sizeof(SWFContext),
524 .audio_codec = AV_CODEC_ID_MP3,
525 .video_codec = AV_CODEC_ID_FLV1,
526 .write_header = swf_write_header,
527 .write_packet = swf_write_packet,
528 .write_trailer = swf_write_trailer,
529 .flags = AVFMT_TS_NONSTRICT,
532 #if CONFIG_AVM2_MUXER
533 AVOutputFormat ff_avm2_muxer = {
535 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
536 .mime_type = "application/x-shockwave-flash",
537 .priv_data_size = sizeof(SWFContext),
538 .audio_codec = AV_CODEC_ID_MP3,
539 .video_codec = AV_CODEC_ID_FLV1,
540 .write_header = swf_write_header,
541 .write_packet = swf_write_packet,
542 .write_trailer = swf_write_trailer,
543 .flags = AVFMT_TS_NONSTRICT,