simplify
[libav.git] / libavformat / swfenc.c
1 /*
2 * Flash Compatible Streaming Format muxer
3 * Copyright (c) 2000 Fabrice Bellard.
4 * Copyright (c) 2003 Tinic Uro.
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 #include "libavcodec/bitstream.h"
24 #include "avformat.h"
25 #include "swf.h"
26
27 static void put_swf_tag(AVFormatContext *s, int tag)
28 {
29 SWFContext *swf = s->priv_data;
30 ByteIOContext *pb = s->pb;
31
32 swf->tag_pos = url_ftell(pb);
33 swf->tag = tag;
34 /* reserve some room for the tag */
35 if (tag & TAG_LONG) {
36 put_le16(pb, 0);
37 put_le32(pb, 0);
38 } else {
39 put_le16(pb, 0);
40 }
41 }
42
43 static void put_swf_end_tag(AVFormatContext *s)
44 {
45 SWFContext *swf = s->priv_data;
46 ByteIOContext *pb = s->pb;
47 offset_t pos;
48 int tag_len, tag;
49
50 pos = url_ftell(pb);
51 tag_len = pos - swf->tag_pos - 2;
52 tag = swf->tag;
53 url_fseek(pb, swf->tag_pos, SEEK_SET);
54 if (tag & TAG_LONG) {
55 tag &= ~TAG_LONG;
56 put_le16(pb, (tag << 6) | 0x3f);
57 put_le32(pb, tag_len - 4);
58 } else {
59 assert(tag_len < 0x3f);
60 put_le16(pb, (tag << 6) | tag_len);
61 }
62 url_fseek(pb, pos, SEEK_SET);
63 }
64
65 static inline void max_nbits(int *nbits_ptr, int val)
66 {
67 int n;
68
69 if (val == 0)
70 return;
71 val = abs(val);
72 n = 1;
73 while (val != 0) {
74 n++;
75 val >>= 1;
76 }
77 if (n > *nbits_ptr)
78 *nbits_ptr = n;
79 }
80
81 static void put_swf_rect(ByteIOContext *pb,
82 int xmin, int xmax, int ymin, int ymax)
83 {
84 PutBitContext p;
85 uint8_t buf[256];
86 int nbits, mask;
87
88 init_put_bits(&p, buf, sizeof(buf));
89
90 nbits = 0;
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;
96
97 /* rectangle info */
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);
103
104 flush_put_bits(&p);
105 put_buffer(pb, buf, pbBufPtr(&p) - p.buf);
106 }
107
108 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
109 {
110 int nbits, mask;
111
112 put_bits(pb, 1, 1); /* edge */
113 put_bits(pb, 1, 1); /* line select */
114 nbits = 2;
115 max_nbits(&nbits, dx);
116 max_nbits(&nbits, dy);
117
118 mask = (1 << nbits) - 1;
119 put_bits(pb, 4, nbits - 2); /* 16 bits precision */
120 if (dx == 0) {
121 put_bits(pb, 1, 0);
122 put_bits(pb, 1, 1);
123 put_bits(pb, nbits, dy & mask);
124 } else if (dy == 0) {
125 put_bits(pb, 1, 0);
126 put_bits(pb, 1, 0);
127 put_bits(pb, nbits, dx & mask);
128 } else {
129 put_bits(pb, 1, 1);
130 put_bits(pb, nbits, dx & mask);
131 put_bits(pb, nbits, dy & mask);
132 }
133 }
134
135 #define FRAC_BITS 16
136
137 static void put_swf_matrix(ByteIOContext *pb,
138 int a, int b, int c, int d, int tx, int ty)
139 {
140 PutBitContext p;
141 uint8_t buf[256];
142 int nbits;
143
144 init_put_bits(&p, buf, sizeof(buf));
145
146 put_bits(&p, 1, 1); /* a, d present */
147 nbits = 1;
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);
153
154 put_bits(&p, 1, 1); /* b, c present */
155 nbits = 1;
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);
161
162 nbits = 1;
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);
168
169 flush_put_bits(&p);
170 put_buffer(pb, buf, pbBufPtr(&p) - p.buf);
171 }
172
173 static int swf_write_header(AVFormatContext *s)
174 {
175 SWFContext *swf = s->priv_data;
176 ByteIOContext *pb = s->pb;
177 AVCodecContext *enc, *audio_enc, *video_enc;
178 PutBitContext p;
179 uint8_t buf1[256];
180 int i, width, height, rate, rate_base;
181 int is_avm2;
182
183 swf->audio_in_pos = 0;
184 swf->sound_samples = 0;
185 swf->swf_frame_number = 0;
186 swf->video_frame_number = 0;
187
188 video_enc = NULL;
189 audio_enc = NULL;
190 for(i=0;i<s->nb_streams;i++) {
191 enc = s->streams[i]->codec;
192 if (enc->codec_type == CODEC_TYPE_AUDIO) {
193 if (enc->codec_id == CODEC_ID_MP3) {
194 if (!enc->frame_size) {
195 av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
196 return -1;
197 }
198 audio_enc = enc;
199 } else {
200 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
201 return -1;
202 }
203 } else {
204 if (enc->codec_id == CODEC_ID_VP6F ||
205 enc->codec_id == CODEC_ID_FLV1 ||
206 enc->codec_id == CODEC_ID_MJPEG) {
207 video_enc = enc;
208 } else {
209 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
210 return -1;
211 }
212 }
213 }
214
215 if (!video_enc) {
216 /* currently, cannot work correctly if audio only */
217 swf->video_type = 0;
218 width = 320;
219 height = 200;
220 rate = 10;
221 rate_base= 1;
222 } else {
223 swf->video_type = video_enc->codec_id;
224 width = video_enc->width;
225 height = video_enc->height;
226 rate = video_enc->time_base.den;
227 rate_base = video_enc->time_base.num;
228 }
229
230 if (!audio_enc) {
231 swf->audio_type = 0;
232 swf->samples_per_frame = (44100. * rate_base) / rate;
233 } else {
234 swf->audio_type = audio_enc->codec_id;
235 swf->samples_per_frame = (audio_enc->sample_rate * rate_base) / rate;
236 }
237
238 is_avm2 = !strcmp("avm2", s->oformat->name);
239
240 put_tag(pb, "FWS");
241 if (is_avm2)
242 put_byte(pb, 9);
243 else if (video_enc && video_enc->codec_id == CODEC_ID_VP6F)
244 put_byte(pb, 8); /* version (version 8 and above support VP6 codec) */
245 else if (video_enc && video_enc->codec_id == CODEC_ID_FLV1)
246 put_byte(pb, 6); /* version (version 6 and above support FLV1 codec) */
247 else
248 put_byte(pb, 4); /* version (should use 4 for mpeg audio support) */
249 put_le32(pb, DUMMY_FILE_SIZE); /* dummy size
250 (will be patched if not streamed) */
251
252 put_swf_rect(pb, 0, width * 20, 0, height * 20);
253 put_le16(pb, (rate * 256) / rate_base); /* frame rate */
254 swf->duration_pos = url_ftell(pb);
255 put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
256
257 /* avm2/swf v9 (also v8?) files require a file attribute tag */
258 if (is_avm2) {
259 put_swf_tag(s, TAG_FILEATTRIBUTES);
260 put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
261 put_swf_end_tag(s);
262 }
263
264 /* define a shape with the jpeg inside */
265 if (video_enc && video_enc->codec_id == CODEC_ID_MJPEG) {
266 put_swf_tag(s, TAG_DEFINESHAPE);
267
268 put_le16(pb, SHAPE_ID); /* ID of shape */
269 /* bounding rectangle */
270 put_swf_rect(pb, 0, width, 0, height);
271 /* style info */
272 put_byte(pb, 1); /* one fill style */
273 put_byte(pb, 0x41); /* clipped bitmap fill */
274 put_le16(pb, BITMAP_ID); /* bitmap ID */
275 /* position of the bitmap */
276 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
277 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
278 put_byte(pb, 0); /* no line style */
279
280 /* shape drawing */
281 init_put_bits(&p, buf1, sizeof(buf1));
282 put_bits(&p, 4, 1); /* one fill bit */
283 put_bits(&p, 4, 0); /* zero line bit */
284
285 put_bits(&p, 1, 0); /* not an edge */
286 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
287 put_bits(&p, 5, 1); /* nbits */
288 put_bits(&p, 1, 0); /* X */
289 put_bits(&p, 1, 0); /* Y */
290 put_bits(&p, 1, 1); /* set fill style 1 */
291
292 /* draw the rectangle ! */
293 put_swf_line_edge(&p, width, 0);
294 put_swf_line_edge(&p, 0, height);
295 put_swf_line_edge(&p, -width, 0);
296 put_swf_line_edge(&p, 0, -height);
297
298 /* end of shape */
299 put_bits(&p, 1, 0); /* not an edge */
300 put_bits(&p, 5, 0);
301
302 flush_put_bits(&p);
303 put_buffer(pb, buf1, pbBufPtr(&p) - p.buf);
304
305 put_swf_end_tag(s);
306 }
307
308 if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3) {
309 int v;
310
311 /* start sound */
312 put_swf_tag(s, TAG_STREAMHEAD2);
313
314 v = 0;
315 switch(audio_enc->sample_rate) {
316 case 11025:
317 v |= 1 << 2;
318 break;
319 case 22050:
320 v |= 2 << 2;
321 break;
322 case 44100:
323 v |= 3 << 2;
324 break;
325 default:
326 /* not supported */
327 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
328 return -1;
329 }
330 v |= 0x02; /* 16 bit playback */
331 if (audio_enc->channels == 2)
332 v |= 0x01; /* stereo playback */
333 put_byte(s->pb, v);
334 v |= 0x20; /* mp3 compressed */
335 put_byte(s->pb, v);
336 put_le16(s->pb, swf->samples_per_frame); /* avg samples per frame */
337 put_le16(s->pb, 0);
338
339 put_swf_end_tag(s);
340 }
341
342 put_flush_packet(s->pb);
343 return 0;
344 }
345
346 static int swf_write_video(AVFormatContext *s,
347 AVCodecContext *enc, const uint8_t *buf, int size)
348 {
349 SWFContext *swf = s->priv_data;
350 ByteIOContext *pb = s->pb;
351
352 /* Flash Player limit */
353 if (swf->swf_frame_number == 16000)
354 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
355
356 if (swf->video_type == CODEC_ID_VP6F ||
357 swf->video_type == CODEC_ID_FLV1) {
358 if (swf->video_frame_number == 0) {
359 /* create a new video object */
360 put_swf_tag(s, TAG_VIDEOSTREAM);
361 put_le16(pb, VIDEO_ID);
362 put_le16(pb, 15000); /* hard flash player limit */
363 put_le16(pb, enc->width);
364 put_le16(pb, enc->height);
365 put_byte(pb, 0);
366 put_byte(pb,codec_get_tag(swf_codec_tags,swf->video_type));
367 put_swf_end_tag(s);
368
369 /* place the video object for the first time */
370 put_swf_tag(s, TAG_PLACEOBJECT2);
371 put_byte(pb, 0x36);
372 put_le16(pb, 1);
373 put_le16(pb, VIDEO_ID);
374 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
375 put_le16(pb, swf->video_frame_number);
376 put_tag(pb, "video");
377 put_byte(pb, 0x00);
378 put_swf_end_tag(s);
379 } else {
380 /* mark the character for update */
381 put_swf_tag(s, TAG_PLACEOBJECT2);
382 put_byte(pb, 0x11);
383 put_le16(pb, 1);
384 put_le16(pb, swf->video_frame_number);
385 put_swf_end_tag(s);
386 }
387
388 /* set video frame data */
389 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
390 put_le16(pb, VIDEO_ID);
391 put_le16(pb, swf->video_frame_number++);
392 put_buffer(pb, buf, size);
393 put_swf_end_tag(s);
394 } else if (swf->video_type == CODEC_ID_MJPEG) {
395 if (swf->swf_frame_number > 0) {
396 /* remove the shape */
397 put_swf_tag(s, TAG_REMOVEOBJECT);
398 put_le16(pb, SHAPE_ID); /* shape ID */
399 put_le16(pb, 1); /* depth */
400 put_swf_end_tag(s);
401
402 /* free the bitmap */
403 put_swf_tag(s, TAG_FREECHARACTER);
404 put_le16(pb, BITMAP_ID);
405 put_swf_end_tag(s);
406 }
407
408 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
409
410 put_le16(pb, BITMAP_ID); /* ID of the image */
411
412 /* a dummy jpeg header seems to be required */
413 put_byte(pb, 0xff);
414 put_byte(pb, 0xd8);
415 put_byte(pb, 0xff);
416 put_byte(pb, 0xd9);
417 /* write the jpeg image */
418 put_buffer(pb, buf, size);
419
420 put_swf_end_tag(s);
421
422 /* draw the shape */
423
424 put_swf_tag(s, TAG_PLACEOBJECT);
425 put_le16(pb, SHAPE_ID); /* shape ID */
426 put_le16(pb, 1); /* depth */
427 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
428 put_swf_end_tag(s);
429 }
430
431 swf->swf_frame_number ++;
432
433 /* streaming sound always should be placed just before showframe tags */
434 if (swf->audio_type && swf->audio_in_pos) {
435 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
436 put_le16(pb, swf->sound_samples);
437 put_le16(pb, 0); // seek samples
438 put_buffer(pb, swf->audio_fifo, swf->audio_in_pos);
439 put_swf_end_tag(s);
440
441 /* update FIFO */
442 swf->sound_samples = 0;
443 swf->audio_in_pos = 0;
444 }
445
446 /* output the frame */
447 put_swf_tag(s, TAG_SHOWFRAME);
448 put_swf_end_tag(s);
449
450 put_flush_packet(s->pb);
451
452 return 0;
453 }
454
455 static int swf_write_audio(AVFormatContext *s,
456 AVCodecContext *enc, const uint8_t *buf, int size)
457 {
458 SWFContext *swf = s->priv_data;
459
460 /* Flash Player limit */
461 if (swf->swf_frame_number == 16000)
462 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
463
464 if (swf->audio_in_pos + size >= AUDIO_FIFO_SIZE) {
465 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
466 return -1;
467 }
468
469 memcpy(swf->audio_fifo + swf->audio_in_pos, buf, size);
470 swf->audio_in_pos += size;
471 swf->sound_samples += enc->frame_size;
472
473 /* if audio only stream make sure we add swf frames */
474 if (swf->video_type == 0)
475 swf_write_video(s, enc, 0, 0);
476
477 return 0;
478 }
479
480 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
481 {
482 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
483 if (codec->codec_type == CODEC_TYPE_AUDIO)
484 return swf_write_audio(s, codec, pkt->data, pkt->size);
485 else
486 return swf_write_video(s, codec, pkt->data, pkt->size);
487 }
488
489 static int swf_write_trailer(AVFormatContext *s)
490 {
491 SWFContext *swf = s->priv_data;
492 ByteIOContext *pb = s->pb;
493 AVCodecContext *enc, *video_enc;
494 int file_size, i;
495
496 video_enc = NULL;
497 for(i=0;i<s->nb_streams;i++) {
498 enc = s->streams[i]->codec;
499 if (enc->codec_type == CODEC_TYPE_VIDEO)
500 video_enc = enc;
501 }
502
503 put_swf_tag(s, TAG_END);
504 put_swf_end_tag(s);
505
506 put_flush_packet(s->pb);
507
508 /* patch file size and number of frames if not streamed */
509 if (!url_is_streamed(s->pb) && video_enc) {
510 file_size = url_ftell(pb);
511 url_fseek(pb, 4, SEEK_SET);
512 put_le32(pb, file_size);
513 url_fseek(pb, swf->duration_pos, SEEK_SET);
514 put_le16(pb, video_enc->frame_number);
515 url_fseek(pb, file_size, SEEK_SET);
516 }
517 return 0;
518 }
519
520 #ifdef CONFIG_SWF_MUXER
521 AVOutputFormat swf_muxer = {
522 "swf",
523 "Flash format",
524 "application/x-shockwave-flash",
525 "swf",
526 sizeof(SWFContext),
527 CODEC_ID_MP3,
528 CODEC_ID_FLV1,
529 swf_write_header,
530 swf_write_packet,
531 swf_write_trailer,
532 };
533 #endif
534 #ifdef CONFIG_AVM2_MUXER
535 AVOutputFormat avm2_muxer = {
536 "avm2",
537 "Flash 9 (AVM2) format",
538 "application/x-shockwave-flash",
539 NULL,
540 sizeof(SWFContext),
541 CODEC_ID_MP3,
542 CODEC_ID_FLV1,
543 swf_write_header,
544 swf_write_packet,
545 swf_write_trailer,
546 };
547 #endif