vaapi_h264: fix slice data offset
[libav.git] / libavformat / avisynth.c
CommitLineData
9dc5607b 1/*
f0b234ab 2 * AviSynth/AvxSynth support
3 * Copyright (c) 2012 AvxSynth Team.
9dc5607b 4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
9dc5607b 11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
97b052e5 22#include "libavutil/internal.h"
f0b234ab 23#include "libavcodec/internal.h"
9dc5607b 24#include "avformat.h"
c3f9ebf7 25#include "internal.h"
f0b234ab 26
27/* Enable function pointer definitions for runtime loading. */
28#define AVSC_NO_DECLSPEC
29
30/* Platform-specific directives for AviSynth vs AvxSynth.
31 *
32 * avisynth_c.h needs to be the one provided with x264, as
33 * the one in AviSynth's CVS hasn't been updated to support
34 * 2.6's extra colorspaces. A temporary source of that header,
35 * installable from a GNU-style Makefile is available from
36 * github.com/qyot27/avisynth_headers -- AvxSynth doesn't
37 * require this kind of special treatment because like any
38 * standard *nix application, it installs its headers
39 * alongside its libs. */
40#ifdef _WIN32
41 #include <windows.h>
42 #undef EXTERN_C
43 #include <avisynth/avisynth_c.h>
44 #define AVISYNTH_LIB "avisynth"
45 #define USING_AVISYNTH
46#else
47 #include <dlfcn.h>
48 #include <avxsynth/avxsynth_c.h>
49 #if defined (__APPLE__)
50 #define AVISYNTH_LIB "libavxsynth.dylib"
51 #else
52 #define AVISYNTH_LIB "libavxsynth.so"
53 #endif
54
f2ad1495 55 #define LoadLibrary(x) dlopen(x, RTLD_NOW | RTLD_LOCAL)
f0b234ab 56 #define GetProcAddress dlsym
57 #define FreeLibrary dlclose
58#endif
59
60typedef struct AviSynthLibrary {
61 void *library;
62#define AVSC_DECLARE_FUNC(name) name ## _func name
63 AVSC_DECLARE_FUNC(avs_bit_blt);
64 AVSC_DECLARE_FUNC(avs_clip_get_error);
65 AVSC_DECLARE_FUNC(avs_create_script_environment);
66 AVSC_DECLARE_FUNC(avs_delete_script_environment);
67 AVSC_DECLARE_FUNC(avs_get_audio);
68 AVSC_DECLARE_FUNC(avs_get_error);
69 AVSC_DECLARE_FUNC(avs_get_frame);
70 AVSC_DECLARE_FUNC(avs_get_version);
71 AVSC_DECLARE_FUNC(avs_get_video_info);
72 AVSC_DECLARE_FUNC(avs_invoke);
73 AVSC_DECLARE_FUNC(avs_release_clip);
74 AVSC_DECLARE_FUNC(avs_release_value);
75 AVSC_DECLARE_FUNC(avs_release_video_frame);
76 AVSC_DECLARE_FUNC(avs_take_clip);
77#undef AVSC_DECLARE_FUNC
78} AviSynthLibrary;
79
80typedef struct AviSynthContext {
81 AVS_ScriptEnvironment *env;
82 AVS_Clip *clip;
83 const AVS_VideoInfo *vi;
84
85 /* avisynth_read_packet_video() iterates over this. */
86 int n_planes;
87 const int *planes;
88
89 int curr_stream;
90 int curr_frame;
91 int64_t curr_sample;
92
93 int error;
94
95 /* Linked list pointers. */
96 struct AviSynthContext *next;
03039f4c 97} AviSynthContext;
9dc5607b 98
f0b234ab 99static const int avs_planes_packed[1] = { 0 };
100static const int avs_planes_grey[1] = { AVS_PLANAR_Y };
101static const int avs_planes_yuv[3] = { AVS_PLANAR_Y, AVS_PLANAR_U,
102 AVS_PLANAR_V };
103
104/* A conflict between C++ global objects, atexit, and dynamic loading requires
105 * us to register our own atexit handler to prevent double freeing. */
106static AviSynthLibrary avs_library;
107static int avs_atexit_called = 0;
108
109/* Linked list of AviSynthContexts. An atexit handler destroys this list. */
110static AviSynthContext *avs_ctx_list = NULL;
111
112static av_cold void avisynth_atexit_handler(void);
113
114static av_cold int avisynth_load_library(void)
115{
116 avs_library.library = LoadLibrary(AVISYNTH_LIB);
117 if (!avs_library.library)
118 return AVERROR_UNKNOWN;
119
120#define LOAD_AVS_FUNC(name, continue_on_fail) \
121 avs_library.name = \
122 (void *)GetProcAddress(avs_library.library, #name); \
123 if (!continue_on_fail && !avs_library.name) \
124 goto fail;
125
126 LOAD_AVS_FUNC(avs_bit_blt, 0);
127 LOAD_AVS_FUNC(avs_clip_get_error, 0);
128 LOAD_AVS_FUNC(avs_create_script_environment, 0);
129 LOAD_AVS_FUNC(avs_delete_script_environment, 0);
130 LOAD_AVS_FUNC(avs_get_audio, 0);
131 LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6
132 LOAD_AVS_FUNC(avs_get_frame, 0);
133 LOAD_AVS_FUNC(avs_get_version, 0);
134 LOAD_AVS_FUNC(avs_get_video_info, 0);
135 LOAD_AVS_FUNC(avs_invoke, 0);
136 LOAD_AVS_FUNC(avs_release_clip, 0);
137 LOAD_AVS_FUNC(avs_release_value, 0);
138 LOAD_AVS_FUNC(avs_release_video_frame, 0);
139 LOAD_AVS_FUNC(avs_take_clip, 0);
140#undef LOAD_AVS_FUNC
141
142 atexit(avisynth_atexit_handler);
143 return 0;
144
145fail:
146 FreeLibrary(avs_library.library);
147 return AVERROR_UNKNOWN;
148}
149
150/* Note that avisynth_context_create and avisynth_context_destroy
151 * do not allocate or free the actual context! That is taken care of
152 * by libavformat. */
153static av_cold int avisynth_context_create(AVFormatContext *s)
9dc5607b 154{
c16ddcc9 155 AviSynthContext *avs = s->priv_data;
f0b234ab 156 int ret;
157
158 if (!avs_library.library)
159 if (ret = avisynth_load_library())
160 return ret;
161
162 avs->env = avs_library.avs_create_script_environment(3);
163 if (avs_library.avs_get_error) {
164 const char *error = avs_library.avs_get_error(avs->env);
165 if (error) {
166 av_log(s, AV_LOG_ERROR, "%s\n", error);
167 return AVERROR_UNKNOWN;
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168 }
169 }
170
f0b234ab 171 if (!avs_ctx_list) {
172 avs_ctx_list = avs;
173 } else {
174 avs->next = avs_ctx_list;
175 avs_ctx_list = avs;
176 }
177
c16ddcc9 178 return 0;
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179}
180
f0b234ab 181static av_cold void avisynth_context_destroy(AviSynthContext *avs)
182{
183 if (avs_atexit_called)
184 return;
185
186 if (avs == avs_ctx_list) {
187 avs_ctx_list = avs->next;
188 } else {
189 AviSynthContext *prev = avs_ctx_list;
190 while (prev->next != avs)
191 prev = prev->next;
192 prev->next = avs->next;
193 }
194
195 if (avs->clip) {
196 avs_library.avs_release_clip(avs->clip);
197 avs->clip = NULL;
198 }
199 if (avs->env) {
200 avs_library.avs_delete_script_environment(avs->env);
201 avs->env = NULL;
202 }
203}
204
205static av_cold void avisynth_atexit_handler(void)
206{
207 AviSynthContext *avs = avs_ctx_list;
208
209 while (avs) {
210 AviSynthContext *next = avs->next;
211 avisynth_context_destroy(avs);
212 avs = next;
213 }
214 FreeLibrary(avs_library.library);
215
216 avs_atexit_called = 1;
217}
218
219/* Create AVStream from audio and video data. */
220static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
221{
222 AviSynthContext *avs = s->priv_data;
223 int planar = 0; // 0: packed, 1: YUV, 2: Y8
224
225 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
226 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
227 st->codec->width = avs->vi->width;
228 st->codec->height = avs->vi->height;
229
230 st->time_base = (AVRational) { avs->vi->fps_denominator,
231 avs->vi->fps_numerator };
232 st->avg_frame_rate = (AVRational) { avs->vi->fps_numerator,
233 avs->vi->fps_denominator };
234 st->start_time = 0;
235 st->duration = avs->vi->num_frames;
236 st->nb_frames = avs->vi->num_frames;
237
238 switch (avs->vi->pixel_type) {
239#ifdef USING_AVISYNTH
240 case AVS_CS_YV24:
241 st->codec->pix_fmt = AV_PIX_FMT_YUV444P;
242 planar = 1;
243 break;
244 case AVS_CS_YV16:
245 st->codec->pix_fmt = AV_PIX_FMT_YUV422P;
246 planar = 1;
247 break;
248 case AVS_CS_YV411:
249 st->codec->pix_fmt = AV_PIX_FMT_YUV411P;
250 planar = 1;
251 break;
252 case AVS_CS_Y8:
253 st->codec->pix_fmt = AV_PIX_FMT_GRAY8;
254 planar = 2;
255 break;
256#endif
257 case AVS_CS_BGR24:
258 st->codec->pix_fmt = AV_PIX_FMT_BGR24;
259 break;
260 case AVS_CS_BGR32:
261 st->codec->pix_fmt = AV_PIX_FMT_RGB32;
262 break;
263 case AVS_CS_YUY2:
264 st->codec->pix_fmt = AV_PIX_FMT_YUYV422;
265 break;
266 case AVS_CS_YV12:
267 st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
268 planar = 1;
269 break;
270 case AVS_CS_I420: // Is this even used anywhere?
271 st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
272 planar = 1;
273 break;
274 default:
275 av_log(s, AV_LOG_ERROR,
276 "unknown AviSynth colorspace %d\n", avs->vi->pixel_type);
277 avs->error = 1;
278 return AVERROR_UNKNOWN;
279 }
280
281 switch (planar) {
282 case 2: // Y8
283 avs->n_planes = 1;
284 avs->planes = avs_planes_grey;
285 break;
286 case 1: // YUV
287 avs->n_planes = 3;
288 avs->planes = avs_planes_yuv;
289 break;
290 default:
291 avs->n_planes = 1;
292 avs->planes = avs_planes_packed;
293 }
294 return 0;
295}
296
297static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st)
298{
299 AviSynthContext *avs = s->priv_data;
300
301 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
302 st->codec->sample_rate = avs->vi->audio_samples_per_second;
303 st->codec->channels = avs->vi->nchannels;
304 st->time_base = (AVRational) { 1,
305 avs->vi->audio_samples_per_second };
7c377f0e 306 st->duration = avs->vi->num_audio_samples;
f0b234ab 307
308 switch (avs->vi->sample_type) {
309 case AVS_SAMPLE_INT8:
310 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
311 break;
312 case AVS_SAMPLE_INT16:
313 st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
314 break;
315 case AVS_SAMPLE_INT24:
316 st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
317 break;
318 case AVS_SAMPLE_INT32:
319 st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
320 break;
321 case AVS_SAMPLE_FLOAT:
322 st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
323 break;
324 default:
325 av_log(s, AV_LOG_ERROR,
326 "unknown AviSynth sample type %d\n", avs->vi->sample_type);
327 avs->error = 1;
328 return AVERROR_UNKNOWN;
329 }
330 return 0;
331}
332
333static int avisynth_create_stream(AVFormatContext *s)
334{
335 AviSynthContext *avs = s->priv_data;
336 AVStream *st;
337 int ret;
338 int id = 0;
339
340 if (avs_has_video(avs->vi)) {
341 st = avformat_new_stream(s, NULL);
342 if (!st)
343 return AVERROR_UNKNOWN;
344 st->id = id++;
345 if (ret = avisynth_create_stream_video(s, st))
346 return ret;
347 }
348 if (avs_has_audio(avs->vi)) {
349 st = avformat_new_stream(s, NULL);
350 if (!st)
351 return AVERROR_UNKNOWN;
352 st->id = id++;
353 if (ret = avisynth_create_stream_audio(s, st))
354 return ret;
355 }
356 return 0;
357}
358
359static int avisynth_open_file(AVFormatContext *s)
9dc5607b 360{
c16ddcc9 361 AviSynthContext *avs = s->priv_data;
f0b234ab 362 AVS_Value arg, val;
363 int ret;
364#ifdef USING_AVISYNTH
365 char filename_ansi[MAX_PATH * 4];
366 wchar_t filename_wc[MAX_PATH * 4];
367#endif
368
369 if (ret = avisynth_context_create(s))
370 return ret;
371
372#ifdef USING_AVISYNTH
373 /* Convert UTF-8 to ANSI code page */
374 MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4);
375 WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi,
376 MAX_PATH * 4, NULL, NULL);
377 arg = avs_new_value_string(filename_ansi);
378#else
379 arg = avs_new_value_string(s->filename);
380#endif
381 val = avs_library.avs_invoke(avs->env, "Import", arg, 0);
382 if (avs_is_error(val)) {
383 av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val));
384 ret = AVERROR_UNKNOWN;
385 goto fail;
386 }
387 if (!avs_is_clip(val)) {
388 av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
389 ret = AVERROR_UNKNOWN;
390 goto fail;
391 }
9dc5607b 392
f0b234ab 393 avs->clip = avs_library.avs_take_clip(val, avs->env);
394 avs->vi = avs_library.avs_get_video_info(avs->clip);
9dc5607b 395
f0b234ab 396#ifdef USING_AVISYNTH
397 /* libav only supports AviSynth 2.6 on Windows. Since AvxSynth
398 * identifies itself as interface version 3 like 2.5.8, this
399 * needs to be special-cased. */
400
401 if (avs_library.avs_get_version(avs->clip) == 3) {
402 av_log(s, AV_LOG_ERROR,
403 "AviSynth 2.5.8 not supported. Please upgrade to 2.6.\n");
404 ret = AVERROR_UNKNOWN;
405 goto fail;
406 }
407#endif
9dc5607b 408
f0b234ab 409 /* Release the AVS_Value as it will go out of scope. */
410 avs_library.avs_release_value(val);
411
412 if (ret = avisynth_create_stream(s))
413 goto fail;
414
415 return 0;
9dc5607b 416
f0b234ab 417fail:
418 avisynth_context_destroy(avs);
419 return ret;
420}
9dc5607b 421
f0b234ab 422static void avisynth_next_stream(AVFormatContext *s, AVStream **st,
423 AVPacket *pkt, int *discard)
424{
425 AviSynthContext *avs = s->priv_data;
9dc5607b 426
c9db8694 427 avs->curr_stream++;
f0b234ab 428 avs->curr_stream %= s->nb_streams;
9dc5607b 429
c9db8694 430 *st = s->streams[avs->curr_stream];
f0b234ab 431 if ((*st)->discard == AVDISCARD_ALL)
432 *discard = 1;
433 else
434 *discard = 0;
9dc5607b 435
f0b234ab 436 return;
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437}
438
f0b234ab 439/* Copy AviSynth clip data into an AVPacket. */
440static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
441 int discard)
9dc5607b 442{
c16ddcc9 443 AviSynthContext *avs = s->priv_data;
f0b234ab 444 AVS_VideoFrame *frame;
445 unsigned char *dst_p;
446 const unsigned char *src_p;
447 int n, i, plane, rowsize, planeheight, pitch, bits;
448 const char *error;
449
450 if (avs->curr_frame >= avs->vi->num_frames)
451 return AVERROR_EOF;
452
453 /* This must happen even if the stream is discarded to prevent desync. */
454 n = avs->curr_frame++;
455 if (discard)
456 return 0;
457
f0b234ab 458#ifdef USING_AVISYNTH
459 /* Define the bpp values for the new AviSynth 2.6 colorspaces.
460 * Since AvxSynth doesn't have these functions, special-case
461 * it in order to avoid implicit declaration errors. */
462
463 if (avs_is_yv24(avs->vi))
464 bits = 24;
465 else if (avs_is_yv16(avs->vi))
466 bits = 16;
467 else if (avs_is_yv411(avs->vi))
468 bits = 12;
469 else if (avs_is_y8(avs->vi))
470 bits = 8;
471 else
472#endif
473 bits = avs_bits_per_pixel(avs->vi);
474
475 /* Without the cast to int64_t, calculation overflows at about 9k x 9k
476 * resolution. */
477 pkt->size = (((int64_t)avs->vi->width *
478 (int64_t)avs->vi->height) * bits) / 8;
479 if (!pkt->size)
480 return AVERROR_UNKNOWN;
481
482 if (av_new_packet(pkt, pkt->size) < 0)
483 return AVERROR(ENOMEM);
484
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MN
485 pkt->pts = n;
486 pkt->dts = n;
487 pkt->duration = 1;
488 pkt->stream_index = avs->curr_stream;
489
f0b234ab 490 frame = avs_library.avs_get_frame(avs->clip, n);
491 error = avs_library.avs_clip_get_error(avs->clip);
492 if (error) {
493 av_log(s, AV_LOG_ERROR, "%s\n", error);
494 avs->error = 1;
495 av_packet_unref(pkt);
496 return AVERROR_UNKNOWN;
497 }
9dc5607b 498
f0b234ab 499 dst_p = pkt->data;
500 for (i = 0; i < avs->n_planes; i++) {
501 plane = avs->planes[i];
502 src_p = avs_get_read_ptr_p(frame, plane);
503 pitch = avs_get_pitch_p(frame, plane);
504
505 rowsize = avs_get_row_size_p(frame, plane);
506 planeheight = avs_get_height_p(frame, plane);
507
508 /* Flip RGB video. */
509 if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) {
510 src_p = src_p + (planeheight - 1) * pitch;
511 pitch = -pitch;
512 }
9dc5607b 513
f0b234ab 514 avs_library.avs_bit_blt(avs->env, dst_p, rowsize, src_p, pitch,
515 rowsize, planeheight);
516 dst_p += rowsize * planeheight;
517 }
518
519 avs_library.avs_release_video_frame(frame);
c16ddcc9 520 return 0;
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GP
521}
522
f0b234ab 523static int avisynth_read_packet_audio(AVFormatContext *s, AVPacket *pkt,
524 int discard)
9dc5607b 525{
c16ddcc9 526 AviSynthContext *avs = s->priv_data;
f0b234ab 527 AVRational fps, samplerate;
528 int samples;
529 int64_t n;
530 const char *error;
531
532 if (avs->curr_sample >= avs->vi->num_audio_samples)
533 return AVERROR_EOF;
534
535 fps.num = avs->vi->fps_numerator;
536 fps.den = avs->vi->fps_denominator;
537 samplerate.num = avs->vi->audio_samples_per_second;
538 samplerate.den = 1;
539
540 if (avs_has_video(avs->vi)) {
541 if (avs->curr_frame < avs->vi->num_frames)
542 samples = av_rescale_q(avs->curr_frame, samplerate, fps) -
543 avs->curr_sample;
544 else
545 samples = av_rescale_q(1, samplerate, fps);
546 } else {
547 samples = 1000;
548 }
549
550 /* After seeking, audio may catch up with video. */
551 if (samples <= 0) {
552 pkt->size = 0;
553 pkt->data = NULL;
554 return 0;
555 }
556
557 if (avs->curr_sample + samples > avs->vi->num_audio_samples)
558 samples = avs->vi->num_audio_samples - avs->curr_sample;
559
560 /* This must happen even if the stream is discarded to prevent desync. */
561 n = avs->curr_sample;
562 avs->curr_sample += samples;
563 if (discard)
564 return 0;
565
f0b234ab 566 pkt->size = avs_bytes_per_channel_sample(avs->vi) *
567 samples * avs->vi->nchannels;
568 if (!pkt->size)
569 return AVERROR_UNKNOWN;
570
571 if (av_new_packet(pkt, pkt->size) < 0)
572 return AVERROR(ENOMEM);
573
c9db8694
MN
574 pkt->pts = n;
575 pkt->dts = n;
576 pkt->duration = samples;
577 pkt->stream_index = avs->curr_stream;
578
f0b234ab 579 avs_library.avs_get_audio(avs->clip, pkt->data, n, samples);
580 error = avs_library.avs_clip_get_error(avs->clip);
581 if (error) {
582 av_log(s, AV_LOG_ERROR, "%s\n", error);
583 avs->error = 1;
584 av_packet_unref(pkt);
585 return AVERROR_UNKNOWN;
586 }
587 return 0;
588}
589
590static av_cold int avisynth_read_header(AVFormatContext *s)
591{
592 int ret;
593
594 // Calling library must implement a lock for thread-safe opens.
595 if (ret = avpriv_lock_avformat())
596 return ret;
9dc5607b 597
f0b234ab 598 if (ret = avisynth_open_file(s)) {
599 avpriv_unlock_avformat();
600 return ret;
601 }
602
603 avpriv_unlock_avformat();
604 return 0;
605}
606
607static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
608{
609 AviSynthContext *avs = s->priv_data;
610 AVStream *st;
611 int discard = 0;
612 int ret;
613
614 if (avs->error)
615 return AVERROR_UNKNOWN;
616
617 /* If either stream reaches EOF, try to read the other one before
618 * giving up. */
619 avisynth_next_stream(s, &st, pkt, &discard);
620 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
621 ret = avisynth_read_packet_video(s, pkt, discard);
622 if (ret == AVERROR_EOF && avs_has_audio(avs->vi)) {
623 avisynth_next_stream(s, &st, pkt, &discard);
624 return avisynth_read_packet_audio(s, pkt, discard);
625 }
626 } else {
627 ret = avisynth_read_packet_audio(s, pkt, discard);
628 if (ret == AVERROR_EOF && avs_has_video(avs->vi)) {
629 avisynth_next_stream(s, &st, pkt, &discard);
630 return avisynth_read_packet_video(s, pkt, discard);
631 }
632 }
633
634 return ret;
635}
636
637static av_cold int avisynth_read_close(AVFormatContext *s)
638{
639 if (avpriv_lock_avformat())
640 return AVERROR_UNKNOWN;
641
642 avisynth_context_destroy(s->priv_data);
643 avpriv_unlock_avformat();
644 return 0;
645}
646
647static int avisynth_read_seek(AVFormatContext *s, int stream_index,
648 int64_t timestamp, int flags)
649{
650 AviSynthContext *avs = s->priv_data;
651 AVStream *st;
652 AVRational fps, samplerate;
653
654 if (avs->error)
655 return AVERROR_UNKNOWN;
656
657 fps = (AVRational) { avs->vi->fps_numerator,
658 avs->vi->fps_denominator };
659 samplerate = (AVRational) { avs->vi->audio_samples_per_second, 1 };
660
661 st = s->streams[stream_index];
662 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
663 /* AviSynth frame counts are signed int. */
664 if ((timestamp >= avs->vi->num_frames) ||
665 (timestamp > INT_MAX) ||
666 (timestamp < 0))
667 return AVERROR_EOF;
668 avs->curr_frame = timestamp;
669 if (avs_has_audio(avs->vi))
670 avs->curr_sample = av_rescale_q(timestamp, samplerate, fps);
671 } else {
672 if ((timestamp >= avs->vi->num_audio_samples) || (timestamp < 0))
673 return AVERROR_EOF;
674 /* Force frame granularity for seeking. */
675 if (avs_has_video(avs->vi)) {
676 avs->curr_frame = av_rescale_q(timestamp, fps, samplerate);
677 avs->curr_sample = av_rescale_q(avs->curr_frame, samplerate, fps);
678 } else {
679 avs->curr_sample = timestamp;
680 }
681 }
9dc5607b 682
c16ddcc9 683 return 0;
9dc5607b
GP
684}
685
c6610a21 686AVInputFormat ff_avisynth_demuxer = {
0f5b0b41 687 .name = "avisynth",
f0b234ab 688 .long_name = NULL_IF_CONFIG_SMALL("AviSynth script"),
03039f4c 689 .priv_data_size = sizeof(AviSynthContext),
dfc2c4d9
AK
690 .read_header = avisynth_read_header,
691 .read_packet = avisynth_read_packet,
692 .read_close = avisynth_read_close,
693 .read_seek = avisynth_read_seek,
694 .extensions = "avs",
9dc5607b 695};