simplify and use version instead
[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 version;
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 put_tag(pb, "FWS");
239
240 if (!strcmp("avm2", s->oformat->name))
241 version = 9;
242 else if (video_enc && video_enc->codec_id == CODEC_ID_VP6F)
243 version = 8; /* version 8 and above support VP6 codec */
244 else if (video_enc && video_enc->codec_id == CODEC_ID_FLV1)
245 version = 6; /* version 6 and above support FLV1 codec */
246 else
247 version = 4; /* version 4 for mpeg audio support */
248 put_byte(pb, version);
249
250 put_le32(pb, DUMMY_FILE_SIZE); /* dummy size
251 (will be patched if not streamed) */
252
253 put_swf_rect(pb, 0, width * 20, 0, height * 20);
254 put_le16(pb, (rate * 256) / rate_base); /* frame rate */
255 swf->duration_pos = url_ftell(pb);
256 put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
257
258 /* avm2/swf v9 (also v8?) files require a file attribute tag */
259 if (version == 9) {
260 put_swf_tag(s, TAG_FILEATTRIBUTES);
261 put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
262 put_swf_end_tag(s);
263 }
264
265 /* define a shape with the jpeg inside */
266 if (video_enc && video_enc->codec_id == CODEC_ID_MJPEG) {
267 put_swf_tag(s, TAG_DEFINESHAPE);
268
269 put_le16(pb, SHAPE_ID); /* ID of shape */
270 /* bounding rectangle */
271 put_swf_rect(pb, 0, width, 0, height);
272 /* style info */
273 put_byte(pb, 1); /* one fill style */
274 put_byte(pb, 0x41); /* clipped bitmap fill */
275 put_le16(pb, BITMAP_ID); /* bitmap ID */
276 /* position of the bitmap */
277 put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
278 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
279 put_byte(pb, 0); /* no line style */
280
281 /* shape drawing */
282 init_put_bits(&p, buf1, sizeof(buf1));
283 put_bits(&p, 4, 1); /* one fill bit */
284 put_bits(&p, 4, 0); /* zero line bit */
285
286 put_bits(&p, 1, 0); /* not an edge */
287 put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
288 put_bits(&p, 5, 1); /* nbits */
289 put_bits(&p, 1, 0); /* X */
290 put_bits(&p, 1, 0); /* Y */
291 put_bits(&p, 1, 1); /* set fill style 1 */
292
293 /* draw the rectangle ! */
294 put_swf_line_edge(&p, width, 0);
295 put_swf_line_edge(&p, 0, height);
296 put_swf_line_edge(&p, -width, 0);
297 put_swf_line_edge(&p, 0, -height);
298
299 /* end of shape */
300 put_bits(&p, 1, 0); /* not an edge */
301 put_bits(&p, 5, 0);
302
303 flush_put_bits(&p);
304 put_buffer(pb, buf1, pbBufPtr(&p) - p.buf);
305
306 put_swf_end_tag(s);
307 }
308
309 if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3) {
310 int v;
311
312 /* start sound */
313 put_swf_tag(s, TAG_STREAMHEAD2);
314
315 v = 0;
316 switch(audio_enc->sample_rate) {
317 case 11025:
318 v |= 1 << 2;
319 break;
320 case 22050:
321 v |= 2 << 2;
322 break;
323 case 44100:
324 v |= 3 << 2;
325 break;
326 default:
327 /* not supported */
328 av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
329 return -1;
330 }
331 v |= 0x02; /* 16 bit playback */
332 if (audio_enc->channels == 2)
333 v |= 0x01; /* stereo playback */
334 put_byte(s->pb, v);
335 v |= 0x20; /* mp3 compressed */
336 put_byte(s->pb, v);
337 put_le16(s->pb, swf->samples_per_frame); /* avg samples per frame */
338 put_le16(s->pb, 0);
339
340 put_swf_end_tag(s);
341 }
342
343 put_flush_packet(s->pb);
344 return 0;
345 }
346
347 static int swf_write_video(AVFormatContext *s,
348 AVCodecContext *enc, const uint8_t *buf, int size)
349 {
350 SWFContext *swf = s->priv_data;
351 ByteIOContext *pb = s->pb;
352
353 /* Flash Player limit */
354 if (swf->swf_frame_number == 16000)
355 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
356
357 if (swf->video_type == CODEC_ID_VP6F ||
358 swf->video_type == CODEC_ID_FLV1) {
359 if (swf->video_frame_number == 0) {
360 /* create a new video object */
361 put_swf_tag(s, TAG_VIDEOSTREAM);
362 put_le16(pb, VIDEO_ID);
363 put_le16(pb, 15000); /* hard flash player limit */
364 put_le16(pb, enc->width);
365 put_le16(pb, enc->height);
366 put_byte(pb, 0);
367 put_byte(pb,codec_get_tag(swf_codec_tags,swf->video_type));
368 put_swf_end_tag(s);
369
370 /* place the video object for the first time */
371 put_swf_tag(s, TAG_PLACEOBJECT2);
372 put_byte(pb, 0x36);
373 put_le16(pb, 1);
374 put_le16(pb, VIDEO_ID);
375 put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
376 put_le16(pb, swf->video_frame_number);
377 put_tag(pb, "video");
378 put_byte(pb, 0x00);
379 put_swf_end_tag(s);
380 } else {
381 /* mark the character for update */
382 put_swf_tag(s, TAG_PLACEOBJECT2);
383 put_byte(pb, 0x11);
384 put_le16(pb, 1);
385 put_le16(pb, swf->video_frame_number);
386 put_swf_end_tag(s);
387 }
388
389 /* set video frame data */
390 put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
391 put_le16(pb, VIDEO_ID);
392 put_le16(pb, swf->video_frame_number++);
393 put_buffer(pb, buf, size);
394 put_swf_end_tag(s);
395 } else if (swf->video_type == CODEC_ID_MJPEG) {
396 if (swf->swf_frame_number > 0) {
397 /* remove the shape */
398 put_swf_tag(s, TAG_REMOVEOBJECT);
399 put_le16(pb, SHAPE_ID); /* shape ID */
400 put_le16(pb, 1); /* depth */
401 put_swf_end_tag(s);
402
403 /* free the bitmap */
404 put_swf_tag(s, TAG_FREECHARACTER);
405 put_le16(pb, BITMAP_ID);
406 put_swf_end_tag(s);
407 }
408
409 put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
410
411 put_le16(pb, BITMAP_ID); /* ID of the image */
412
413 /* a dummy jpeg header seems to be required */
414 put_be32(pb, 0xffd8ffd9);
415 /* write the jpeg image */
416 put_buffer(pb, buf, size);
417
418 put_swf_end_tag(s);
419
420 /* draw the shape */
421
422 put_swf_tag(s, TAG_PLACEOBJECT);
423 put_le16(pb, SHAPE_ID); /* shape ID */
424 put_le16(pb, 1); /* depth */
425 put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
426 put_swf_end_tag(s);
427 }
428
429 swf->swf_frame_number ++;
430
431 /* streaming sound always should be placed just before showframe tags */
432 if (swf->audio_type && swf->audio_in_pos) {
433 put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
434 put_le16(pb, swf->sound_samples);
435 put_le16(pb, 0); // seek samples
436 put_buffer(pb, swf->audio_fifo, swf->audio_in_pos);
437 put_swf_end_tag(s);
438
439 /* update FIFO */
440 swf->sound_samples = 0;
441 swf->audio_in_pos = 0;
442 }
443
444 /* output the frame */
445 put_swf_tag(s, TAG_SHOWFRAME);
446 put_swf_end_tag(s);
447
448 put_flush_packet(s->pb);
449
450 return 0;
451 }
452
453 static int swf_write_audio(AVFormatContext *s,
454 AVCodecContext *enc, const uint8_t *buf, int size)
455 {
456 SWFContext *swf = s->priv_data;
457
458 /* Flash Player limit */
459 if (swf->swf_frame_number == 16000)
460 av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
461
462 if (swf->audio_in_pos + size >= AUDIO_FIFO_SIZE) {
463 av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
464 return -1;
465 }
466
467 memcpy(swf->audio_fifo + swf->audio_in_pos, buf, size);
468 swf->audio_in_pos += size;
469 swf->sound_samples += enc->frame_size;
470
471 /* if audio only stream make sure we add swf frames */
472 if (swf->video_type == 0)
473 swf_write_video(s, enc, 0, 0);
474
475 return 0;
476 }
477
478 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
479 {
480 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
481 if (codec->codec_type == CODEC_TYPE_AUDIO)
482 return swf_write_audio(s, codec, pkt->data, pkt->size);
483 else
484 return swf_write_video(s, codec, pkt->data, pkt->size);
485 }
486
487 static int swf_write_trailer(AVFormatContext *s)
488 {
489 SWFContext *swf = s->priv_data;
490 ByteIOContext *pb = s->pb;
491 AVCodecContext *enc, *video_enc;
492 int file_size, i;
493
494 video_enc = NULL;
495 for(i=0;i<s->nb_streams;i++) {
496 enc = s->streams[i]->codec;
497 if (enc->codec_type == CODEC_TYPE_VIDEO)
498 video_enc = enc;
499 }
500
501 put_swf_tag(s, TAG_END);
502 put_swf_end_tag(s);
503
504 put_flush_packet(s->pb);
505
506 /* patch file size and number of frames if not streamed */
507 if (!url_is_streamed(s->pb) && video_enc) {
508 file_size = url_ftell(pb);
509 url_fseek(pb, 4, SEEK_SET);
510 put_le32(pb, file_size);
511 url_fseek(pb, swf->duration_pos, SEEK_SET);
512 put_le16(pb, video_enc->frame_number);
513 url_fseek(pb, file_size, SEEK_SET);
514 }
515 return 0;
516 }
517
518 #ifdef CONFIG_SWF_MUXER
519 AVOutputFormat swf_muxer = {
520 "swf",
521 "Flash format",
522 "application/x-shockwave-flash",
523 "swf",
524 sizeof(SWFContext),
525 CODEC_ID_MP3,
526 CODEC_ID_FLV1,
527 swf_write_header,
528 swf_write_packet,
529 swf_write_trailer,
530 };
531 #endif
532 #ifdef CONFIG_AVM2_MUXER
533 AVOutputFormat avm2_muxer = {
534 "avm2",
535 "Flash 9 (AVM2) format",
536 "application/x-shockwave-flash",
537 NULL,
538 sizeof(SWFContext),
539 CODEC_ID_MP3,
540 CODEC_ID_FLV1,
541 swf_write_header,
542 swf_write_packet,
543 swf_write_trailer,
544 };
545 #endif