fd5f323e136f4ac982b0951b04f101698829690f
[libav.git] / libavformat / avisynth.c
1 /*
2 * AviSynth/AvxSynth support
3 * Copyright (c) 2012 AvxSynth Team
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/attributes.h"
23 #include "libavutil/internal.h"
24
25 #include "libavcodec/internal.h"
26
27 #include "avformat.h"
28 #include "internal.h"
29 #include "config.h"
30
31 /* Enable function pointer definitions for runtime loading. */
32 #define AVSC_NO_DECLSPEC
33
34 /* Platform-specific directives for AviSynth vs AvxSynth. */
35 #ifdef _WIN32
36 #include <windows.h>
37 #undef EXTERN_C
38 #include <avisynth/avisynth_c.h>
39 #define AVISYNTH_LIB "avisynth"
40 #define USING_AVISYNTH
41 #else
42 #include <dlfcn.h>
43 #include <avxsynth/avxsynth_c.h>
44 #define AVISYNTH_NAME "libavxsynth"
45 #define AVISYNTH_LIB AVISYNTH_NAME SLIBSUF
46
47 #define LoadLibrary(x) dlopen(x, RTLD_NOW | RTLD_LOCAL)
48 #define GetProcAddress dlsym
49 #define FreeLibrary dlclose
50 #endif
51
52 typedef struct AviSynthLibrary {
53 void *library;
54 #define AVSC_DECLARE_FUNC(name) name ## _func name
55 AVSC_DECLARE_FUNC(avs_bit_blt);
56 AVSC_DECLARE_FUNC(avs_clip_get_error);
57 AVSC_DECLARE_FUNC(avs_create_script_environment);
58 AVSC_DECLARE_FUNC(avs_delete_script_environment);
59 AVSC_DECLARE_FUNC(avs_get_audio);
60 AVSC_DECLARE_FUNC(avs_get_error);
61 AVSC_DECLARE_FUNC(avs_get_frame);
62 AVSC_DECLARE_FUNC(avs_get_version);
63 AVSC_DECLARE_FUNC(avs_get_video_info);
64 AVSC_DECLARE_FUNC(avs_invoke);
65 AVSC_DECLARE_FUNC(avs_release_clip);
66 AVSC_DECLARE_FUNC(avs_release_value);
67 AVSC_DECLARE_FUNC(avs_release_video_frame);
68 AVSC_DECLARE_FUNC(avs_take_clip);
69 #ifdef USING_AVISYNTH
70 AVSC_DECLARE_FUNC(avs_bits_per_pixel);
71 AVSC_DECLARE_FUNC(avs_get_height_p);
72 AVSC_DECLARE_FUNC(avs_get_pitch_p);
73 AVSC_DECLARE_FUNC(avs_get_read_ptr_p);
74 AVSC_DECLARE_FUNC(avs_get_row_size_p);
75 AVSC_DECLARE_FUNC(avs_is_planar_rgb);
76 AVSC_DECLARE_FUNC(avs_is_planar_rgba);
77 #endif
78 #undef AVSC_DECLARE_FUNC
79 } AviSynthLibrary;
80
81 typedef struct AviSynthContext {
82 AVS_ScriptEnvironment *env;
83 AVS_Clip *clip;
84 const AVS_VideoInfo *vi;
85
86 /* avisynth_read_packet_video() iterates over this. */
87 int n_planes;
88 const int *planes;
89
90 int curr_stream;
91 int curr_frame;
92 int64_t curr_sample;
93
94 int error;
95
96 /* Linked list pointers. */
97 struct AviSynthContext *next;
98 } AviSynthContext;
99
100 static const int avs_planes_packed[1] = { 0 };
101 static const int avs_planes_grey[1] = { AVS_PLANAR_Y };
102 static const int avs_planes_yuv[3] = { AVS_PLANAR_Y, AVS_PLANAR_U,
103 AVS_PLANAR_V };
104 #ifdef USING_AVISYNTH
105 static const int avs_planes_rgb[3] = { AVS_PLANAR_G, AVS_PLANAR_B,
106 AVS_PLANAR_R };
107 static const int avs_planes_yuva[4] = { AVS_PLANAR_Y, AVS_PLANAR_U,
108 AVS_PLANAR_V, AVS_PLANAR_A };
109 static const int avs_planes_rgba[4] = { AVS_PLANAR_G, AVS_PLANAR_B,
110 AVS_PLANAR_R, AVS_PLANAR_A };
111 #endif
112
113 /* A conflict between C++ global objects, atexit, and dynamic loading requires
114 * us to register our own atexit handler to prevent double freeing. */
115 static AviSynthLibrary avs_library;
116 static int avs_atexit_called = 0;
117
118 /* Linked list of AviSynthContexts. An atexit handler destroys this list. */
119 static AviSynthContext *avs_ctx_list = NULL;
120
121 static av_cold void avisynth_atexit_handler(void);
122
123 static av_cold int avisynth_load_library(void)
124 {
125 avs_library.library = LoadLibrary(AVISYNTH_LIB);
126 if (!avs_library.library)
127 return AVERROR_UNKNOWN;
128
129 #define LOAD_AVS_FUNC(name, continue_on_fail) \
130 avs_library.name = GetProcAddress(avs_library.library, #name); \
131 if (!continue_on_fail && !avs_library.name) \
132 goto fail;
133
134 LOAD_AVS_FUNC(avs_bit_blt, 0);
135 LOAD_AVS_FUNC(avs_clip_get_error, 0);
136 LOAD_AVS_FUNC(avs_create_script_environment, 0);
137 LOAD_AVS_FUNC(avs_delete_script_environment, 0);
138 LOAD_AVS_FUNC(avs_get_audio, 0);
139 LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6
140 LOAD_AVS_FUNC(avs_get_frame, 0);
141 LOAD_AVS_FUNC(avs_get_version, 0);
142 LOAD_AVS_FUNC(avs_get_video_info, 0);
143 LOAD_AVS_FUNC(avs_invoke, 0);
144 LOAD_AVS_FUNC(avs_release_clip, 0);
145 LOAD_AVS_FUNC(avs_release_value, 0);
146 LOAD_AVS_FUNC(avs_release_video_frame, 0);
147 LOAD_AVS_FUNC(avs_take_clip, 0);
148 #ifdef USING_AVISYNTH
149 LOAD_AVS_FUNC(avs_bits_per_pixel, 1);
150 LOAD_AVS_FUNC(avs_get_height_p, 1);
151 LOAD_AVS_FUNC(avs_get_pitch_p, 1);
152 LOAD_AVS_FUNC(avs_get_read_ptr_p, 1);
153 LOAD_AVS_FUNC(avs_get_row_size_p, 1);
154 LOAD_AVS_FUNC(avs_is_planar_rgb, 1);
155 LOAD_AVS_FUNC(avs_is_planar_rgba, 1);
156 #endif
157 #undef LOAD_AVS_FUNC
158
159 atexit(avisynth_atexit_handler);
160 return 0;
161
162 fail:
163 FreeLibrary(avs_library.library);
164 return AVERROR_UNKNOWN;
165 }
166
167 /* Note that avisynth_context_create and avisynth_context_destroy
168 * do not allocate or free the actual context! That is taken care of
169 * by libavformat. */
170 static av_cold int avisynth_context_create(AVFormatContext *s)
171 {
172 AviSynthContext *avs = s->priv_data;
173 int ret;
174
175 if (!avs_library.library)
176 if (ret = avisynth_load_library())
177 return ret;
178
179 avs->env = avs_library.avs_create_script_environment(3);
180 if (avs_library.avs_get_error) {
181 const char *error = avs_library.avs_get_error(avs->env);
182 if (error) {
183 av_log(s, AV_LOG_ERROR, "%s\n", error);
184 return AVERROR_UNKNOWN;
185 }
186 }
187
188 if (!avs_ctx_list) {
189 avs_ctx_list = avs;
190 } else {
191 avs->next = avs_ctx_list;
192 avs_ctx_list = avs;
193 }
194
195 return 0;
196 }
197
198 static av_cold void avisynth_context_destroy(AviSynthContext *avs)
199 {
200 if (avs_atexit_called)
201 return;
202
203 if (avs == avs_ctx_list) {
204 avs_ctx_list = avs->next;
205 } else {
206 AviSynthContext *prev = avs_ctx_list;
207 while (prev->next != avs)
208 prev = prev->next;
209 prev->next = avs->next;
210 }
211
212 if (avs->clip) {
213 avs_library.avs_release_clip(avs->clip);
214 avs->clip = NULL;
215 }
216 if (avs->env) {
217 avs_library.avs_delete_script_environment(avs->env);
218 avs->env = NULL;
219 }
220 }
221
222 static av_cold void avisynth_atexit_handler(void)
223 {
224 AviSynthContext *avs = avs_ctx_list;
225
226 while (avs) {
227 AviSynthContext *next = avs->next;
228 avisynth_context_destroy(avs);
229 avs = next;
230 }
231 FreeLibrary(avs_library.library);
232
233 avs_atexit_called = 1;
234 }
235
236 /* Create AVStream from audio and video data. */
237 static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
238 {
239 AviSynthContext *avs = s->priv_data;
240 int planar = 0; // 0: packed, 1: YUV, 2: Y8, 3: Planar RGB, 4: YUVA, 5: Planar RGBA
241
242 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
243 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
244 st->codecpar->width = avs->vi->width;
245 st->codecpar->height = avs->vi->height;
246
247 st->avg_frame_rate = (AVRational) { avs->vi->fps_numerator,
248 avs->vi->fps_denominator };
249 st->start_time = 0;
250 st->duration = avs->vi->num_frames;
251 st->nb_frames = avs->vi->num_frames;
252 avpriv_set_pts_info(st, 32, avs->vi->fps_denominator, avs->vi->fps_numerator);
253
254 switch (avs->vi->pixel_type) {
255 #ifdef USING_AVISYNTH
256 /* 10~16-bit YUV pix_fmts (AviSynth+) */
257 case AVS_CS_YUV444P10:
258 st->codecpar->format = AV_PIX_FMT_YUV444P10;
259 planar = 1;
260 break;
261 case AVS_CS_YUV422P10:
262 st->codecpar->format = AV_PIX_FMT_YUV422P10;
263 planar = 1;
264 break;
265 case AVS_CS_YUV420P10:
266 st->codecpar->format = AV_PIX_FMT_YUV420P10;
267 planar = 1;
268 break;
269 case AVS_CS_YUV444P12:
270 st->codecpar->format = AV_PIX_FMT_YUV444P12;
271 planar = 1;
272 break;
273 case AVS_CS_YUV422P12:
274 st->codecpar->format = AV_PIX_FMT_YUV422P12;
275 planar = 1;
276 break;
277 case AVS_CS_YUV420P12:
278 st->codecpar->format = AV_PIX_FMT_YUV420P12;
279 planar = 1;
280 break;
281 case AVS_CS_YUV444P16:
282 st->codecpar->format = AV_PIX_FMT_YUV444P16;
283 planar = 1;
284 break;
285 case AVS_CS_YUV422P16:
286 st->codecpar->format = AV_PIX_FMT_YUV422P16;
287 planar = 1;
288 break;
289 case AVS_CS_YUV420P16:
290 st->codecpar->format = AV_PIX_FMT_YUV420P16;
291 planar = 1;
292 break;
293 /* 8~16-bit YUV pix_fmts with Alpha (AviSynth+) */
294 case AVS_CS_YUVA444:
295 st->codecpar->format = AV_PIX_FMT_YUVA444P;
296 planar = 4;
297 break;
298 case AVS_CS_YUVA422:
299 st->codecpar->format = AV_PIX_FMT_YUVA422P;
300 planar = 4;
301 break;
302 case AVS_CS_YUVA420:
303 st->codecpar->format = AV_PIX_FMT_YUVA420P;
304 planar = 4;
305 break;
306 case AVS_CS_YUVA444P10:
307 st->codecpar->format = AV_PIX_FMT_YUVA444P10;
308 planar = 4;
309 break;
310 case AVS_CS_YUVA422P10:
311 st->codecpar->format = AV_PIX_FMT_YUVA422P10;
312 planar = 4;
313 break;
314 case AVS_CS_YUVA420P10:
315 st->codecpar->format = AV_PIX_FMT_YUVA420P10;
316 planar = 4;
317 break;
318 case AVS_CS_YUVA444P16:
319 st->codecpar->format = AV_PIX_FMT_YUVA444P16;
320 planar = 4;
321 break;
322 case AVS_CS_YUVA422P16:
323 st->codecpar->format = AV_PIX_FMT_YUVA422P16;
324 planar = 4;
325 break;
326 case AVS_CS_YUVA420P16:
327 st->codecpar->format = AV_PIX_FMT_YUVA420P16;
328 planar = 4;
329 break;
330 /* Planar RGB pix_fmts (AviSynth+) */
331 case AVS_CS_RGBP:
332 st->codecpar->format = AV_PIX_FMT_GBRP;
333 planar = 3;
334 break;
335 case AVS_CS_RGBP10:
336 st->codecpar->format = AV_PIX_FMT_GBRP10;
337 planar = 3;
338 break;
339 case AVS_CS_RGBP12:
340 st->codecpar->format = AV_PIX_FMT_GBRP12;
341 planar = 3;
342 break;
343 case AVS_CS_RGBP16:
344 st->codecpar->format = AV_PIX_FMT_GBRP16;
345 planar = 3;
346 break;
347 /* Planar RGB pix_fmts with Alpha (AviSynth+) */
348 case AVS_CS_RGBAP:
349 st->codecpar->format = AV_PIX_FMT_GBRAP;
350 planar = 5;
351 break;
352 case AVS_CS_RGBAP12:
353 st->codecpar->format = AV_PIX_FMT_GBRAP12;
354 planar = 5;
355 break;
356 case AVS_CS_RGBAP16:
357 st->codecpar->format = AV_PIX_FMT_GBRAP16;
358 planar = 5;
359 break;
360 /* GRAY16 (AviSynth+) */
361 case AVS_CS_Y16:
362 st->codecpar->format = AV_PIX_FMT_GRAY16;
363 planar = 2;
364 break;
365 /* pix_fmts added in AviSynth 2.6 */
366 case AVS_CS_YV24:
367 st->codecpar->format = AV_PIX_FMT_YUV444P;
368 planar = 1;
369 break;
370 case AVS_CS_YV16:
371 st->codecpar->format = AV_PIX_FMT_YUV422P;
372 planar = 1;
373 break;
374 case AVS_CS_YV411:
375 st->codecpar->format = AV_PIX_FMT_YUV411P;
376 planar = 1;
377 break;
378 case AVS_CS_Y8:
379 st->codecpar->format = AV_PIX_FMT_GRAY8;
380 planar = 2;
381 break;
382 /* 16-bit packed RGB pix_fmts (AviSynth+) */
383 case AVS_CS_BGR48:
384 st->codecpar->format = AV_PIX_FMT_BGR48;
385 break;
386 case AVS_CS_BGR64:
387 st->codecpar->format = AV_PIX_FMT_BGRA64;
388 break;
389 #endif
390 /* AviSynth 2.5 and AvxSynth pix_fmts */
391 case AVS_CS_BGR24:
392 st->codecpar->format = AV_PIX_FMT_BGR24;
393 break;
394 case AVS_CS_BGR32:
395 st->codecpar->format = AV_PIX_FMT_RGB32;
396 break;
397 case AVS_CS_YUY2:
398 st->codecpar->format = AV_PIX_FMT_YUYV422;
399 break;
400 case AVS_CS_YV12:
401 st->codecpar->format = AV_PIX_FMT_YUV420P;
402 planar = 1;
403 break;
404 case AVS_CS_I420: // Is this even used anywhere?
405 st->codecpar->format = AV_PIX_FMT_YUV420P;
406 planar = 1;
407 break;
408 default:
409 av_log(s, AV_LOG_ERROR,
410 "unknown AviSynth colorspace %d\n", avs->vi->pixel_type);
411 avs->error = 1;
412 return AVERROR_UNKNOWN;
413 }
414
415 switch (planar) {
416 #ifdef USING_AVISYNTH
417 case 5: // Planar RGB + Alpha
418 avs->n_planes = 4;
419 avs->planes = avs_planes_rgba;
420 break;
421 case 4: // YUV + Alpha
422 avs->n_planes = 4;
423 avs->planes = avs_planes_yuva;
424 break;
425 case 3: // Planar RGB
426 avs->n_planes = 3;
427 avs->planes = avs_planes_rgb;
428 break;
429 #endif
430 case 2: // Y8
431 avs->n_planes = 1;
432 avs->planes = avs_planes_grey;
433 break;
434 case 1: // YUV
435 avs->n_planes = 3;
436 avs->planes = avs_planes_yuv;
437 break;
438 default:
439 avs->n_planes = 1;
440 avs->planes = avs_planes_packed;
441 }
442 return 0;
443 }
444
445 static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st)
446 {
447 AviSynthContext *avs = s->priv_data;
448
449 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
450 st->codecpar->sample_rate = avs->vi->audio_samples_per_second;
451 st->codecpar->channels = avs->vi->nchannels;
452 st->duration = avs->vi->num_audio_samples;
453 avpriv_set_pts_info(st, 64, 1, avs->vi->audio_samples_per_second);
454
455 switch (avs->vi->sample_type) {
456 case AVS_SAMPLE_INT8:
457 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
458 break;
459 case AVS_SAMPLE_INT16:
460 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
461 break;
462 case AVS_SAMPLE_INT24:
463 st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
464 break;
465 case AVS_SAMPLE_INT32:
466 st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
467 break;
468 case AVS_SAMPLE_FLOAT:
469 st->codecpar->codec_id = AV_CODEC_ID_PCM_F32LE;
470 break;
471 default:
472 av_log(s, AV_LOG_ERROR,
473 "unknown AviSynth sample type %d\n", avs->vi->sample_type);
474 avs->error = 1;
475 return AVERROR_UNKNOWN;
476 }
477 return 0;
478 }
479
480 static int avisynth_create_stream(AVFormatContext *s)
481 {
482 AviSynthContext *avs = s->priv_data;
483 AVStream *st;
484 int ret;
485 int id = 0;
486
487 if (avs_has_video(avs->vi)) {
488 st = avformat_new_stream(s, NULL);
489 if (!st)
490 return AVERROR_UNKNOWN;
491 st->id = id++;
492 if (ret = avisynth_create_stream_video(s, st))
493 return ret;
494 }
495 if (avs_has_audio(avs->vi)) {
496 st = avformat_new_stream(s, NULL);
497 if (!st)
498 return AVERROR_UNKNOWN;
499 st->id = id++;
500 if (ret = avisynth_create_stream_audio(s, st))
501 return ret;
502 }
503 return 0;
504 }
505
506 static int avisynth_open_file(AVFormatContext *s)
507 {
508 AviSynthContext *avs = s->priv_data;
509 AVS_Value arg, val;
510 int ret;
511 #ifdef USING_AVISYNTH
512 char filename_ansi[MAX_PATH * 4];
513 wchar_t filename_wc[MAX_PATH * 4];
514 #endif
515
516 if (ret = avisynth_context_create(s))
517 return ret;
518
519 #ifdef USING_AVISYNTH
520 /* Convert UTF-8 to ANSI code page */
521 MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4);
522 WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi,
523 MAX_PATH * 4, NULL, NULL);
524 arg = avs_new_value_string(filename_ansi);
525 #else
526 arg = avs_new_value_string(s->filename);
527 #endif
528 val = avs_library.avs_invoke(avs->env, "Import", arg, 0);
529 if (avs_is_error(val)) {
530 av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val));
531 ret = AVERROR_UNKNOWN;
532 goto fail;
533 }
534 if (!avs_is_clip(val)) {
535 av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
536 ret = AVERROR_UNKNOWN;
537 goto fail;
538 }
539
540 avs->clip = avs_library.avs_take_clip(val, avs->env);
541 avs->vi = avs_library.avs_get_video_info(avs->clip);
542
543 #ifdef USING_AVISYNTH
544 /* On Windows, libav supports AviSynth interface version 6 or higher.
545 * This includes AviSynth 2.6 RC1 or higher, and AviSynth+ r1718 or higher,
546 * and excludes 2.5 and the 2.6 alphas. Since AvxSynth identifies itself
547 * as interface version 3 like 2.5.8, this needs to be special-cased. */
548
549 if (avs_library.avs_get_version(avs->clip) < 6) {
550 av_log(s, AV_LOG_ERROR,
551 "AviSynth version is too old. Please upgrade to either AviSynth 2.6 >= RC1 or AviSynth+ >= r1718.\n");
552 ret = AVERROR_UNKNOWN;
553 goto fail;
554 }
555 #endif
556
557 /* Release the AVS_Value as it will go out of scope. */
558 avs_library.avs_release_value(val);
559
560 if (ret = avisynth_create_stream(s))
561 goto fail;
562
563 return 0;
564
565 fail:
566 avisynth_context_destroy(avs);
567 return ret;
568 }
569
570 static void avisynth_next_stream(AVFormatContext *s, AVStream **st,
571 AVPacket *pkt, int *discard)
572 {
573 AviSynthContext *avs = s->priv_data;
574
575 avs->curr_stream++;
576 avs->curr_stream %= s->nb_streams;
577
578 *st = s->streams[avs->curr_stream];
579 if ((*st)->discard == AVDISCARD_ALL)
580 *discard = 1;
581 else
582 *discard = 0;
583
584 return;
585 }
586
587 /* Copy AviSynth clip data into an AVPacket. */
588 static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
589 int discard)
590 {
591 AviSynthContext *avs = s->priv_data;
592 AVS_VideoFrame *frame;
593 unsigned char *dst_p;
594 const unsigned char *src_p;
595 int n, i, plane, rowsize, planeheight, pitch, bits;
596 const char *error;
597 int avsplus av_unused;
598
599 if (avs->curr_frame >= avs->vi->num_frames)
600 return AVERROR_EOF;
601
602 /* This must happen even if the stream is discarded to prevent desync. */
603 n = avs->curr_frame++;
604 if (discard)
605 return 0;
606
607 #ifdef USING_AVISYNTH
608 /* Detect whether we're using AviSynth 2.6 or AviSynth+ by
609 * looking for whether avs_is_planar_rgb exists. */
610 if (GetProcAddress(avs_library.library, "avs_is_planar_rgb") == NULL)
611 avsplus = 0;
612 else
613 avsplus = 1;
614
615 /* avs_bits_per_pixel changed to AVSC_API with AviSynth 2.6, which
616 * requires going through avs_library, while AvxSynth has it under
617 * the older AVSC_INLINE type, so special-case this. */
618
619 bits = avs_library.avs_bits_per_pixel(avs->vi);
620 #else
621 bits = avs_bits_per_pixel(avs->vi);
622 #endif
623
624 /* Without the cast to int64_t, calculation overflows at about 9k x 9k
625 * resolution. */
626 pkt->size = (((int64_t)avs->vi->width *
627 (int64_t)avs->vi->height) * bits) / 8;
628 if (!pkt->size)
629 return AVERROR_UNKNOWN;
630
631 if (av_new_packet(pkt, pkt->size) < 0)
632 return AVERROR(ENOMEM);
633
634 pkt->pts = n;
635 pkt->dts = n;
636 pkt->duration = 1;
637 pkt->stream_index = avs->curr_stream;
638
639 frame = avs_library.avs_get_frame(avs->clip, n);
640 error = avs_library.avs_clip_get_error(avs->clip);
641 if (error) {
642 av_log(s, AV_LOG_ERROR, "%s\n", error);
643 avs->error = 1;
644 av_packet_unref(pkt);
645 return AVERROR_UNKNOWN;
646 }
647
648 dst_p = pkt->data;
649 for (i = 0; i < avs->n_planes; i++) {
650 plane = avs->planes[i];
651 #ifdef USING_AVISYNTH
652 src_p = avs_library.avs_get_read_ptr_p(frame, plane);
653 pitch = avs_library.avs_get_pitch_p(frame, plane);
654
655 rowsize = avs_library.avs_get_row_size_p(frame, plane);
656 planeheight = avs_library.avs_get_height_p(frame, plane);
657 #else
658 src_p = avs_get_read_ptr_p(frame, plane);
659 pitch = avs_get_pitch_p(frame, plane);
660
661 rowsize = avs_get_row_size_p(frame, plane);
662 planeheight = avs_get_height_p(frame, plane);
663 #endif
664
665 /* Flip RGB video. */
666 if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) {
667 src_p = src_p + (planeheight - 1) * pitch;
668 pitch = -pitch;
669 }
670
671 #ifdef USING_AVISYNTH
672 /* Flip Planar RGB video */
673 if (avsplus && (avs_library.avs_is_planar_rgb(avs->vi) ||
674 avs_library.avs_is_planar_rgba(avs->vi))) {
675 src_p = src_p + (planeheight - 1) * pitch;
676 pitch = -pitch;
677 }
678 #endif
679
680 avs_library.avs_bit_blt(avs->env, dst_p, rowsize, src_p, pitch,
681 rowsize, planeheight);
682 dst_p += rowsize * planeheight;
683 }
684
685 avs_library.avs_release_video_frame(frame);
686 return 0;
687 }
688
689 static int avisynth_read_packet_audio(AVFormatContext *s, AVPacket *pkt,
690 int discard)
691 {
692 AviSynthContext *avs = s->priv_data;
693 AVRational fps, samplerate;
694 int samples;
695 int64_t n;
696 const char *error;
697
698 if (avs->curr_sample >= avs->vi->num_audio_samples)
699 return AVERROR_EOF;
700
701 fps.num = avs->vi->fps_numerator;
702 fps.den = avs->vi->fps_denominator;
703 samplerate.num = avs->vi->audio_samples_per_second;
704 samplerate.den = 1;
705
706 if (avs_has_video(avs->vi)) {
707 if (avs->curr_frame < avs->vi->num_frames)
708 samples = av_rescale_q(avs->curr_frame, samplerate, fps) -
709 avs->curr_sample;
710 else
711 samples = av_rescale_q(1, samplerate, fps);
712 } else {
713 samples = 1000;
714 }
715
716 /* After seeking, audio may catch up with video. */
717 if (samples <= 0) {
718 pkt->size = 0;
719 pkt->data = NULL;
720 return 0;
721 }
722
723 if (avs->curr_sample + samples > avs->vi->num_audio_samples)
724 samples = avs->vi->num_audio_samples - avs->curr_sample;
725
726 /* This must happen even if the stream is discarded to prevent desync. */
727 n = avs->curr_sample;
728 avs->curr_sample += samples;
729 if (discard)
730 return 0;
731
732 pkt->size = avs_bytes_per_channel_sample(avs->vi) *
733 samples * avs->vi->nchannels;
734 if (!pkt->size)
735 return AVERROR_UNKNOWN;
736
737 if (av_new_packet(pkt, pkt->size) < 0)
738 return AVERROR(ENOMEM);
739
740 pkt->pts = n;
741 pkt->dts = n;
742 pkt->duration = samples;
743 pkt->stream_index = avs->curr_stream;
744
745 avs_library.avs_get_audio(avs->clip, pkt->data, n, samples);
746 error = avs_library.avs_clip_get_error(avs->clip);
747 if (error) {
748 av_log(s, AV_LOG_ERROR, "%s\n", error);
749 avs->error = 1;
750 av_packet_unref(pkt);
751 return AVERROR_UNKNOWN;
752 }
753 return 0;
754 }
755
756 static av_cold int avisynth_read_header(AVFormatContext *s)
757 {
758 int ret;
759
760 // Calling library must implement a lock for thread-safe opens.
761 if (ret = avpriv_lock_avformat())
762 return ret;
763
764 if (ret = avisynth_open_file(s)) {
765 avpriv_unlock_avformat();
766 return ret;
767 }
768
769 avpriv_unlock_avformat();
770 return 0;
771 }
772
773 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
774 {
775 AviSynthContext *avs = s->priv_data;
776 AVStream *st;
777 int discard = 0;
778 int ret;
779
780 if (avs->error)
781 return AVERROR_UNKNOWN;
782
783 /* If either stream reaches EOF, try to read the other one before
784 * giving up. */
785 avisynth_next_stream(s, &st, pkt, &discard);
786 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
787 ret = avisynth_read_packet_video(s, pkt, discard);
788 if (ret == AVERROR_EOF && avs_has_audio(avs->vi)) {
789 avisynth_next_stream(s, &st, pkt, &discard);
790 return avisynth_read_packet_audio(s, pkt, discard);
791 }
792 } else {
793 ret = avisynth_read_packet_audio(s, pkt, discard);
794 if (ret == AVERROR_EOF && avs_has_video(avs->vi)) {
795 avisynth_next_stream(s, &st, pkt, &discard);
796 return avisynth_read_packet_video(s, pkt, discard);
797 }
798 }
799
800 return ret;
801 }
802
803 static av_cold int avisynth_read_close(AVFormatContext *s)
804 {
805 if (avpriv_lock_avformat())
806 return AVERROR_UNKNOWN;
807
808 avisynth_context_destroy(s->priv_data);
809 avpriv_unlock_avformat();
810 return 0;
811 }
812
813 static int avisynth_read_seek(AVFormatContext *s, int stream_index,
814 int64_t timestamp, int flags)
815 {
816 AviSynthContext *avs = s->priv_data;
817 AVStream *st;
818 AVRational fps, samplerate;
819
820 if (avs->error)
821 return AVERROR_UNKNOWN;
822
823 fps = (AVRational) { avs->vi->fps_numerator,
824 avs->vi->fps_denominator };
825 samplerate = (AVRational) { avs->vi->audio_samples_per_second, 1 };
826
827 st = s->streams[stream_index];
828 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
829 /* AviSynth frame counts are signed int. */
830 if ((timestamp >= avs->vi->num_frames) ||
831 (timestamp > INT_MAX) ||
832 (timestamp < 0))
833 return AVERROR_EOF;
834 avs->curr_frame = timestamp;
835 if (avs_has_audio(avs->vi))
836 avs->curr_sample = av_rescale_q(timestamp, samplerate, fps);
837 } else {
838 if ((timestamp >= avs->vi->num_audio_samples) || (timestamp < 0))
839 return AVERROR_EOF;
840 /* Force frame granularity for seeking. */
841 if (avs_has_video(avs->vi)) {
842 avs->curr_frame = av_rescale_q(timestamp, fps, samplerate);
843 avs->curr_sample = av_rescale_q(avs->curr_frame, samplerate, fps);
844 } else {
845 avs->curr_sample = timestamp;
846 }
847 }
848
849 return 0;
850 }
851
852 AVInputFormat ff_avisynth_demuxer = {
853 .name = "avisynth",
854 .long_name = NULL_IF_CONFIG_SMALL("AviSynth script"),
855 .priv_data_size = sizeof(AviSynthContext),
856 .read_header = avisynth_read_header,
857 .read_packet = avisynth_read_packet,
858 .read_close = avisynth_read_close,
859 .read_seek = avisynth_read_seek,
860 .extensions = "avs",
861 };