libavformat/avisynth.c

   1 /*
   2  * AviSynth/AvxSynth support
   3  * Copyright (c) 2012 AvxSynth Team
   4  *
   5  * This file is part of FFmpeg
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/internal.h"
  22 #include "libavcodec/internal.h"
  23 #include "avformat.h"
  24 #include "internal.h"
  25 #include "config.h"
  26
  27 /* Enable function pointer definitions for runtime loading. */
  28 #define AVSC_NO_DECLSPEC
  29
  30 /* Platform-specific directives for AviSynth vs AvxSynth. */
  31 #ifdef _WIN32
  32   #include <windows.h>
  33   #undef EXTERN_C
  34   #include "compat/avisynth/avisynth_c.h"
  35   #define AVISYNTH_LIB "avisynth"
  36   #define USING_AVISYNTH
  37 #else
  38   #include <dlfcn.h>
  39   #include "compat/avisynth/avxsynth_c.h"
  40   #define AVISYNTH_NAME "libavxsynth"
  41   #define AVISYNTH_LIB AVISYNTH_NAME SLIBSUF
  42
  43   #define LoadLibrary(x) dlopen(x, RTLD_NOW | RTLD_LOCAL)
  44   #define GetProcAddress dlsym
  45   #define FreeLibrary dlclose
  46 #endif
  47
  48 typedef struct AviSynthLibrary {
  49     void *library;
  50 #define AVSC_DECLARE_FUNC(name) name ## _func name
  51     AVSC_DECLARE_FUNC(avs_bit_blt);
  52     AVSC_DECLARE_FUNC(avs_clip_get_error);
  53     AVSC_DECLARE_FUNC(avs_create_script_environment);
  54     AVSC_DECLARE_FUNC(avs_delete_script_environment);
  55     AVSC_DECLARE_FUNC(avs_get_audio);
  56     AVSC_DECLARE_FUNC(avs_get_error);
  57     AVSC_DECLARE_FUNC(avs_get_frame);
  58     AVSC_DECLARE_FUNC(avs_get_version);
  59     AVSC_DECLARE_FUNC(avs_get_video_info);
  60     AVSC_DECLARE_FUNC(avs_invoke);
  61     AVSC_DECLARE_FUNC(avs_release_clip);
  62     AVSC_DECLARE_FUNC(avs_release_value);
  63     AVSC_DECLARE_FUNC(avs_release_video_frame);
  64     AVSC_DECLARE_FUNC(avs_take_clip);
  65 #ifdef USING_AVISYNTH
  66     AVSC_DECLARE_FUNC(avs_bits_per_pixel);
  67     AVSC_DECLARE_FUNC(avs_get_height_p);
  68     AVSC_DECLARE_FUNC(avs_get_pitch_p);
  69     AVSC_DECLARE_FUNC(avs_get_read_ptr_p);
  70     AVSC_DECLARE_FUNC(avs_get_row_size_p);
  71     AVSC_DECLARE_FUNC(avs_is_planar_rgb);
  72     AVSC_DECLARE_FUNC(avs_is_planar_rgba);
  73 #endif
  74 #undef AVSC_DECLARE_FUNC
  75 } AviSynthLibrary;
  76
  77 typedef struct AviSynthContext {
  78     AVS_ScriptEnvironment *env;
  79     AVS_Clip *clip;
  80     const AVS_VideoInfo *vi;
  81
  82     /* avisynth_read_packet_video() iterates over this. */
  83     int n_planes;
  84     const int *planes;
  85
  86     int curr_stream;
  87     int curr_frame;
  88     int64_t curr_sample;
  89
  90     int error;
  91
  92     /* Linked list pointers. */
  93     struct AviSynthContext *next;
  94 } AviSynthContext;
  95
  96 static const int avs_planes_packed[1] = { 0 };
  97 static const int avs_planes_grey[1]   = { AVS_PLANAR_Y };
  98 static const int avs_planes_yuv[3]    = { AVS_PLANAR_Y, AVS_PLANAR_U,
  99                                           AVS_PLANAR_V };
 100 #ifdef USING_AVISYNTH
 101 static const int avs_planes_rgb[3]    = { AVS_PLANAR_G, AVS_PLANAR_B,
 102                                           AVS_PLANAR_R };
 103 static const int avs_planes_yuva[4]   = { AVS_PLANAR_Y, AVS_PLANAR_U,
 104                                           AVS_PLANAR_V, AVS_PLANAR_A };
 105 static const int avs_planes_rgba[4]   = { AVS_PLANAR_G, AVS_PLANAR_B,
 106                                           AVS_PLANAR_R, AVS_PLANAR_A };
 107 #endif
 108
 109 /* A conflict between C++ global objects, atexit, and dynamic loading requires
 110  * us to register our own atexit handler to prevent double freeing. */
 111 static AviSynthLibrary avs_library;
 112 static int avs_atexit_called        = 0;
 113
 114 /* Linked list of AviSynthContexts. An atexit handler destroys this list. */
 115 static AviSynthContext *avs_ctx_list = NULL;
 116
 117 static av_cold void avisynth_atexit_handler(void);
 118
 119 static av_cold int avisynth_load_library(void)
 120 {
 121     avs_library.library = LoadLibrary(AVISYNTH_LIB);
 122     if (!avs_library.library)
 123         return AVERROR_UNKNOWN;
 124
 125 #define LOAD_AVS_FUNC(name, continue_on_fail)                          \
 126         avs_library.name =                                             \
 127             (void *)GetProcAddress(avs_library.library, #name);        \
 128         if (!continue_on_fail && !avs_library.name)                    \
 129             goto fail;
 130
 131     LOAD_AVS_FUNC(avs_bit_blt, 0);
 132     LOAD_AVS_FUNC(avs_clip_get_error, 0);
 133     LOAD_AVS_FUNC(avs_create_script_environment, 0);
 134     LOAD_AVS_FUNC(avs_delete_script_environment, 0);
 135     LOAD_AVS_FUNC(avs_get_audio, 0);
 136     LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6
 137     LOAD_AVS_FUNC(avs_get_frame, 0);
 138     LOAD_AVS_FUNC(avs_get_version, 0);
 139     LOAD_AVS_FUNC(avs_get_video_info, 0);
 140     LOAD_AVS_FUNC(avs_invoke, 0);
 141     LOAD_AVS_FUNC(avs_release_clip, 0);
 142     LOAD_AVS_FUNC(avs_release_value, 0);
 143     LOAD_AVS_FUNC(avs_release_video_frame, 0);
 144     LOAD_AVS_FUNC(avs_take_clip, 0);
 145 #ifdef USING_AVISYNTH
 146     LOAD_AVS_FUNC(avs_bits_per_pixel, 1);
 147     LOAD_AVS_FUNC(avs_get_height_p, 1);
 148     LOAD_AVS_FUNC(avs_get_pitch_p, 1);
 149     LOAD_AVS_FUNC(avs_get_read_ptr_p, 1);
 150     LOAD_AVS_FUNC(avs_get_row_size_p, 1);
 151     LOAD_AVS_FUNC(avs_is_planar_rgb, 1);
 152     LOAD_AVS_FUNC(avs_is_planar_rgba, 1);
 153 #endif
 154 #undef LOAD_AVS_FUNC
 155
 156     atexit(avisynth_atexit_handler);
 157     return 0;
 158
 159 fail:
 160     FreeLibrary(avs_library.library);
 161     return AVERROR_UNKNOWN;
 162 }
 163
 164 /* Note that avisynth_context_create and avisynth_context_destroy
 165  * do not allocate or free the actual context! That is taken care of
 166  * by libavformat. */
 167 static av_cold int avisynth_context_create(AVFormatContext *s)
 168 {
 169     AviSynthContext *avs = s->priv_data;
 170     int ret;
 171
 172     if (!avs_library.library)
 173         if (ret = avisynth_load_library())
 174             return ret;
 175
 176     avs->env = avs_library.avs_create_script_environment(3);
 177     if (avs_library.avs_get_error) {
 178         const char *error = avs_library.avs_get_error(avs->env);
 179         if (error) {
 180             av_log(s, AV_LOG_ERROR, "%s\n", error);
 181             return AVERROR_UNKNOWN;
 182         }
 183     }
 184
 185     if (!avs_ctx_list) {
 186         avs_ctx_list = avs;
 187     } else {
 188         avs->next    = avs_ctx_list;
 189         avs_ctx_list = avs;
 190     }
 191
 192     return 0;
 193 }
 194
 195 static av_cold void avisynth_context_destroy(AviSynthContext *avs)
 196 {
 197     if (avs_atexit_called)
 198         return;
 199
 200     if (avs == avs_ctx_list) {
 201         avs_ctx_list = avs->next;
 202     } else {
 203         AviSynthContext *prev = avs_ctx_list;
 204         while (prev->next != avs)
 205             prev = prev->next;
 206         prev->next = avs->next;
 207     }
 208
 209     if (avs->clip) {
 210         avs_library.avs_release_clip(avs->clip);
 211         avs->clip = NULL;
 212     }
 213     if (avs->env) {
 214         avs_library.avs_delete_script_environment(avs->env);
 215         avs->env = NULL;
 216     }
 217 }
 218
 219 static av_cold void avisynth_atexit_handler(void)
 220 {
 221     AviSynthContext *avs = avs_ctx_list;
 222
 223     while (avs) {
 224         AviSynthContext *next = avs->next;
 225         avisynth_context_destroy(avs);
 226         avs = next;
 227     }
 228     FreeLibrary(avs_library.library);
 229
 230     avs_atexit_called = 1;
 231 }
 232
 233 /* Create AVStream from audio and video data. */
 234 static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
 235 {
 236     AviSynthContext *avs = s->priv_data;
 237     int planar = 0; // 0: packed, 1: YUV, 2: Y8, 3: Planar RGB, 4: YUVA, 5: Planar RGBA
 238
 239     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 240     st->codecpar->codec_id   = AV_CODEC_ID_RAWVIDEO;
 241     st->codecpar->width      = avs->vi->width;
 242     st->codecpar->height     = avs->vi->height;
 243
 244     st->avg_frame_rate    = (AVRational) { avs->vi->fps_numerator,
 245                                            avs->vi->fps_denominator };
 246     st->start_time        = 0;
 247     st->duration          = avs->vi->num_frames;
 248     st->nb_frames         = avs->vi->num_frames;
 249     avpriv_set_pts_info(st, 32, avs->vi->fps_denominator, avs->vi->fps_numerator);
 250
 251     switch (avs->vi->pixel_type) {
 252 #ifdef USING_AVISYNTH
 253 /* 10~16-bit YUV pix_fmts (AviSynth+) */
 254     case AVS_CS_YUV444P10:
 255         st->codecpar->format = AV_PIX_FMT_YUV444P10;
 256         planar               = 1;
 257         break;
 258     case AVS_CS_YUV422P10:
 259         st->codecpar->format = AV_PIX_FMT_YUV422P10;
 260         planar               = 1;
 261         break;
 262     case AVS_CS_YUV420P10:
 263         st->codecpar->format = AV_PIX_FMT_YUV420P10;
 264         planar               = 1;
 265         break;
 266     case AVS_CS_YUV444P12:
 267         st->codecpar->format = AV_PIX_FMT_YUV444P12;
 268         planar               = 1;
 269         break;
 270     case AVS_CS_YUV422P12:
 271         st->codecpar->format = AV_PIX_FMT_YUV422P12;
 272         planar               = 1;
 273         break;
 274     case AVS_CS_YUV420P12:
 275         st->codecpar->format = AV_PIX_FMT_YUV420P12;
 276         planar               = 1;
 277         break;
 278     case AVS_CS_YUV444P14:
 279         st->codecpar->format = AV_PIX_FMT_YUV444P14;
 280         planar               = 1;
 281         break;
 282     case AVS_CS_YUV422P14:
 283         st->codecpar->format = AV_PIX_FMT_YUV422P14;
 284         planar               = 1;
 285         break;
 286     case AVS_CS_YUV420P14:
 287         st->codecpar->format = AV_PIX_FMT_YUV420P14;
 288         planar               = 1;
 289         break;
 290     case AVS_CS_YUV444P16:
 291         st->codecpar->format = AV_PIX_FMT_YUV444P16;
 292         planar               = 1;
 293         break;
 294     case AVS_CS_YUV422P16:
 295         st->codecpar->format = AV_PIX_FMT_YUV422P16;
 296         planar               = 1;
 297         break;
 298     case AVS_CS_YUV420P16:
 299         st->codecpar->format = AV_PIX_FMT_YUV420P16;
 300         planar               = 1;
 301         break;
 302 /* 8~16-bit YUV pix_fmts with Alpha (AviSynth+) */
 303     case AVS_CS_YUVA444:
 304         st->codecpar->format = AV_PIX_FMT_YUVA444P;
 305         planar               = 4;
 306         break;
 307     case AVS_CS_YUVA422:
 308         st->codecpar->format = AV_PIX_FMT_YUVA422P;
 309         planar               = 4;
 310         break;
 311     case AVS_CS_YUVA420:
 312         st->codecpar->format = AV_PIX_FMT_YUVA420P;
 313         planar               = 4;
 314         break;
 315     case AVS_CS_YUVA444P10:
 316         st->codecpar->format = AV_PIX_FMT_YUVA444P10;
 317         planar               = 4;
 318         break;
 319     case AVS_CS_YUVA422P10:
 320         st->codecpar->format = AV_PIX_FMT_YUVA422P10;
 321         planar               = 4;
 322         break;
 323     case AVS_CS_YUVA420P10:
 324         st->codecpar->format = AV_PIX_FMT_YUVA420P10;
 325         planar               = 4;
 326         break;
 327     case AVS_CS_YUVA444P16:
 328         st->codecpar->format = AV_PIX_FMT_YUVA444P16;
 329         planar               = 4;
 330         break;
 331     case AVS_CS_YUVA422P16:
 332         st->codecpar->format = AV_PIX_FMT_YUVA422P16;
 333         planar               = 4;
 334         break;
 335     case AVS_CS_YUVA420P16:
 336         st->codecpar->format = AV_PIX_FMT_YUVA420P16;
 337         planar               = 4;
 338         break;
 339 /* Planar RGB pix_fmts (AviSynth+)  */
 340     case AVS_CS_RGBP:
 341         st->codecpar->format = AV_PIX_FMT_GBRP;
 342         planar               = 3;
 343         break;
 344     case AVS_CS_RGBP10:
 345         st->codecpar->format = AV_PIX_FMT_GBRP10;
 346         planar               = 3;
 347         break;
 348     case AVS_CS_RGBP12:
 349         st->codecpar->format = AV_PIX_FMT_GBRP12;
 350         planar               = 3;
 351         break;
 352     case AVS_CS_RGBP14:
 353         st->codecpar->format = AV_PIX_FMT_GBRP14;
 354         planar               = 3;
 355         break;
 356     case AVS_CS_RGBP16:
 357         st->codecpar->format = AV_PIX_FMT_GBRP16;
 358         planar               = 3;
 359         break;
 360 /* Planar RGB pix_fmts with Alpha (AviSynth+) */
 361     case AVS_CS_RGBAP:
 362         st->codecpar->format = AV_PIX_FMT_GBRAP;
 363         planar               = 5;
 364         break;
 365     case AVS_CS_RGBAP10:
 366         st->codecpar->format = AV_PIX_FMT_GBRAP10;
 367         planar               = 5;
 368         break;
 369     case AVS_CS_RGBAP12:
 370         st->codecpar->format = AV_PIX_FMT_GBRAP12;
 371         planar               = 5;
 372         break;
 373     case AVS_CS_RGBAP16:
 374         st->codecpar->format = AV_PIX_FMT_GBRAP16;
 375         planar               = 5;
 376         break;
 377 /* GRAY16 (AviSynth+) */
 378     case AVS_CS_Y16:
 379         st->codecpar->format = AV_PIX_FMT_GRAY16;
 380         planar               = 2;
 381         break;
 382 /* pix_fmts added in AviSynth 2.6 */
 383     case AVS_CS_YV24:
 384         st->codecpar->format = AV_PIX_FMT_YUV444P;
 385         planar               = 1;
 386         break;
 387     case AVS_CS_YV16:
 388         st->codecpar->format = AV_PIX_FMT_YUV422P;
 389         planar               = 1;
 390         break;
 391     case AVS_CS_YV411:
 392         st->codecpar->format = AV_PIX_FMT_YUV411P;
 393         planar               = 1;
 394         break;
 395     case AVS_CS_Y8:
 396         st->codecpar->format = AV_PIX_FMT_GRAY8;
 397         planar               = 2;
 398         break;
 399 /* 16-bit packed RGB pix_fmts (AviSynth+) */
 400     case AVS_CS_BGR48:
 401         st->codecpar->format = AV_PIX_FMT_BGR48;
 402         break;
 403     case AVS_CS_BGR64:
 404         st->codecpar->format = AV_PIX_FMT_BGRA64;
 405         break;
 406 #endif
 407 /* AviSynth 2.5 and AvxSynth pix_fmts */
 408     case AVS_CS_BGR24:
 409         st->codecpar->format = AV_PIX_FMT_BGR24;
 410         break;
 411     case AVS_CS_BGR32:
 412         st->codecpar->format = AV_PIX_FMT_RGB32;
 413         break;
 414     case AVS_CS_YUY2:
 415         st->codecpar->format = AV_PIX_FMT_YUYV422;
 416         break;
 417     case AVS_CS_YV12:
 418         st->codecpar->format = AV_PIX_FMT_YUV420P;
 419         planar               = 1;
 420         break;
 421     case AVS_CS_I420: // Is this even used anywhere?
 422         st->codecpar->format = AV_PIX_FMT_YUV420P;
 423         planar               = 1;
 424         break;
 425     default:
 426         av_log(s, AV_LOG_ERROR,
 427                "unknown AviSynth colorspace %d\n", avs->vi->pixel_type);
 428         avs->error = 1;
 429         return AVERROR_UNKNOWN;
 430     }
 431
 432     switch (planar) {
 433 #ifdef USING_AVISYNTH
 434     case 5: // Planar RGB + Alpha
 435         avs->n_planes = 4;
 436         avs->planes   = avs_planes_rgba;
 437         break;
 438     case 4: // YUV + Alpha
 439         avs->n_planes = 4;
 440         avs->planes   = avs_planes_yuva;
 441         break;
 442     case 3: // Planar RGB
 443         avs->n_planes = 3;
 444         avs->planes   = avs_planes_rgb;
 445         break;
 446 #endif
 447     case 2: // Y8
 448         avs->n_planes = 1;
 449         avs->planes   = avs_planes_grey;
 450         break;
 451     case 1: // YUV
 452         avs->n_planes = 3;
 453         avs->planes   = avs_planes_yuv;
 454         break;
 455     default:
 456         avs->n_planes = 1;
 457         avs->planes   = avs_planes_packed;
 458     }
 459     return 0;
 460 }
 461
 462 static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st)
 463 {
 464     AviSynthContext *avs = s->priv_data;
 465
 466     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
 467     st->codecpar->sample_rate = avs->vi->audio_samples_per_second;
 468     st->codecpar->channels    = avs->vi->nchannels;
 469     st->duration              = avs->vi->num_audio_samples;
 470     avpriv_set_pts_info(st, 64, 1, avs->vi->audio_samples_per_second);
 471
 472     switch (avs->vi->sample_type) {
 473     case AVS_SAMPLE_INT8:
 474         st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
 475         break;
 476     case AVS_SAMPLE_INT16:
 477         st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
 478         break;
 479     case AVS_SAMPLE_INT24:
 480         st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
 481         break;
 482     case AVS_SAMPLE_INT32:
 483         st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
 484         break;
 485     case AVS_SAMPLE_FLOAT:
 486         st->codecpar->codec_id = AV_CODEC_ID_PCM_F32LE;
 487         break;
 488     default:
 489         av_log(s, AV_LOG_ERROR,
 490                "unknown AviSynth sample type %d\n", avs->vi->sample_type);
 491         avs->error = 1;
 492         return AVERROR_UNKNOWN;
 493     }
 494     return 0;
 495 }
 496
 497 static int avisynth_create_stream(AVFormatContext *s)
 498 {
 499     AviSynthContext *avs = s->priv_data;
 500     AVStream *st;
 501     int ret;
 502     int id = 0;
 503
 504     if (avs_has_video(avs->vi)) {
 505         st = avformat_new_stream(s, NULL);
 506         if (!st)
 507             return AVERROR_UNKNOWN;
 508         st->id = id++;
 509         if (ret = avisynth_create_stream_video(s, st))
 510             return ret;
 511     }
 512     if (avs_has_audio(avs->vi)) {
 513         st = avformat_new_stream(s, NULL);
 514         if (!st)
 515             return AVERROR_UNKNOWN;
 516         st->id = id++;
 517         if (ret = avisynth_create_stream_audio(s, st))
 518             return ret;
 519     }
 520     return 0;
 521 }
 522
 523 static int avisynth_open_file(AVFormatContext *s)
 524 {
 525     AviSynthContext *avs = s->priv_data;
 526     AVS_Value arg, val;
 527     int ret;
 528 #ifdef USING_AVISYNTH
 529     char filename_ansi[MAX_PATH * 4];
 530     wchar_t filename_wc[MAX_PATH * 4];
 531 #endif
 532
 533     if (ret = avisynth_context_create(s))
 534         return ret;
 535
 536 #ifdef USING_AVISYNTH
 537     /* Convert UTF-8 to ANSI code page */
 538     MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4);
 539     WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi,
 540                         MAX_PATH * 4, NULL, NULL);
 541     arg = avs_new_value_string(filename_ansi);
 542 #else
 543     arg = avs_new_value_string(s->filename);
 544 #endif
 545     val = avs_library.avs_invoke(avs->env, "Import", arg, 0);
 546     if (avs_is_error(val)) {
 547         av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val));
 548         ret = AVERROR_UNKNOWN;
 549         goto fail;
 550     }
 551     if (!avs_is_clip(val)) {
 552         av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
 553         ret = AVERROR_UNKNOWN;
 554         goto fail;
 555     }
 556
 557     avs->clip = avs_library.avs_take_clip(val, avs->env);
 558     avs->vi   = avs_library.avs_get_video_info(avs->clip);
 559
 560 #ifdef USING_AVISYNTH
 561     /* On Windows, FFmpeg supports AviSynth interface version 6 or higher.
 562      * This includes AviSynth 2.6 RC1 or higher, and AviSynth+ r1718 or higher,
 563      * and excludes 2.5 and the 2.6 alphas. Since AvxSynth identifies itself
 564      * as interface version 3 like 2.5.8, this needs to be special-cased. */
 565
 566     if (avs_library.avs_get_version(avs->clip) < 6) {
 567         av_log(s, AV_LOG_ERROR,
 568                "AviSynth version is too old. Please upgrade to either AviSynth 2.6 >= RC1 or AviSynth+ >= r1718.\n");
 569         ret = AVERROR_UNKNOWN;
 570         goto fail;
 571     }
 572 #endif
 573
 574     /* Release the AVS_Value as it will go out of scope. */
 575     avs_library.avs_release_value(val);
 576
 577     if (ret = avisynth_create_stream(s))
 578         goto fail;
 579
 580     return 0;
 581
 582 fail:
 583     avisynth_context_destroy(avs);
 584     return ret;
 585 }
 586
 587 static void avisynth_next_stream(AVFormatContext *s, AVStream **st,
 588                                  AVPacket *pkt, int *discard)
 589 {
 590     AviSynthContext *avs = s->priv_data;
 591
 592     avs->curr_stream++;
 593     avs->curr_stream %= s->nb_streams;
 594
 595     *st = s->streams[avs->curr_stream];
 596     if ((*st)->discard == AVDISCARD_ALL)
 597         *discard = 1;
 598     else
 599         *discard = 0;
 600
 601     return;
 602 }
 603
 604 /* Copy AviSynth clip data into an AVPacket. */
 605 static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
 606                                       int discard)
 607 {
 608     AviSynthContext *avs = s->priv_data;
 609     AVS_VideoFrame *frame;
 610     unsigned char *dst_p;
 611     const unsigned char *src_p;
 612     int n, i, plane, rowsize, planeheight, pitch, bits;
 613     const char *error;
 614
 615     if (avs->curr_frame >= avs->vi->num_frames)
 616         return AVERROR_EOF;
 617
 618     /* This must happen even if the stream is discarded to prevent desync. */
 619     n = avs->curr_frame++;
 620     if (discard)
 621         return 0;
 622
 623 #ifdef USING_AVISYNTH
 624     /* Detect whether we're using AviSynth 2.6 or AviSynth+ by
 625      * looking for whether avs_is_planar_rgb exists. */
 626
 627     int avsplus;
 628
 629     if (GetProcAddress(avs_library.library, "avs_is_planar_rgb") == NULL)
 630         avsplus = 0;
 631     else
 632         avsplus = 1;
 633
 634     /* avs_bits_per_pixel changed to AVSC_API with AviSynth 2.6, which
 635      * requires going through avs_library, while AvxSynth has it under
 636      * the older AVSC_INLINE type, so special-case this. */
 637
 638     bits = avs_library.avs_bits_per_pixel(avs->vi);
 639 #else
 640     bits = avs_bits_per_pixel(avs->vi);
 641 #endif
 642
 643     /* Without the cast to int64_t, calculation overflows at about 9k x 9k
 644      * resolution. */
 645     pkt->size = (((int64_t)avs->vi->width *
 646                   (int64_t)avs->vi->height) * bits) / 8;
 647     if (!pkt->size)
 648         return AVERROR_UNKNOWN;
 649
 650     if (av_new_packet(pkt, pkt->size) < 0)
 651         return AVERROR(ENOMEM);
 652
 653     pkt->pts      = n;
 654     pkt->dts      = n;
 655     pkt->duration = 1;
 656     pkt->stream_index = avs->curr_stream;
 657
 658     frame = avs_library.avs_get_frame(avs->clip, n);
 659     error = avs_library.avs_clip_get_error(avs->clip);
 660     if (error) {
 661         av_log(s, AV_LOG_ERROR, "%s\n", error);
 662         avs->error = 1;
 663         av_packet_unref(pkt);
 664         return AVERROR_UNKNOWN;
 665     }
 666
 667     dst_p = pkt->data;
 668     for (i = 0; i < avs->n_planes; i++) {
 669         plane = avs->planes[i];
 670 #ifdef USING_AVISYNTH
 671         src_p = avs_library.avs_get_read_ptr_p(frame, plane);
 672         pitch = avs_library.avs_get_pitch_p(frame, plane);
 673
 674         rowsize     = avs_library.avs_get_row_size_p(frame, plane);
 675         planeheight = avs_library.avs_get_height_p(frame, plane);
 676 #else
 677         src_p = avs_get_read_ptr_p(frame, plane);
 678         pitch = avs_get_pitch_p(frame, plane);
 679
 680         rowsize     = avs_get_row_size_p(frame, plane);
 681         planeheight = avs_get_height_p(frame, plane);
 682 #endif
 683
 684         /* Flip RGB video. */
 685         if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) {
 686             src_p = src_p + (planeheight - 1) * pitch;
 687             pitch = -pitch;
 688         }
 689
 690 #ifdef USING_AVISYNTH
 691         /* Flip Planar RGB video. */
 692         if (avsplus && (avs_library.avs_is_planar_rgb(avs->vi) ||
 693                         avs_library.avs_is_planar_rgba(avs->vi))) {
 694             src_p = src_p + (planeheight - 1) * pitch;
 695             pitch = -pitch;
 696         }
 697 #endif
 698
 699         avs_library.avs_bit_blt(avs->env, dst_p, rowsize, src_p, pitch,
 700                                  rowsize, planeheight);
 701         dst_p += rowsize * planeheight;
 702     }
 703
 704     avs_library.avs_release_video_frame(frame);
 705     return 0;
 706 }
 707
 708 static int avisynth_read_packet_audio(AVFormatContext *s, AVPacket *pkt,
 709                                       int discard)
 710 {
 711     AviSynthContext *avs = s->priv_data;
 712     AVRational fps, samplerate;
 713     int samples;
 714     int64_t n;
 715     const char *error;
 716
 717     if (avs->curr_sample >= avs->vi->num_audio_samples)
 718         return AVERROR_EOF;
 719
 720     fps.num        = avs->vi->fps_numerator;
 721     fps.den        = avs->vi->fps_denominator;
 722     samplerate.num = avs->vi->audio_samples_per_second;
 723     samplerate.den = 1;
 724
 725     if (avs_has_video(avs->vi)) {
 726         if (avs->curr_frame < avs->vi->num_frames)
 727             samples = av_rescale_q(avs->curr_frame, samplerate, fps) -
 728                       avs->curr_sample;
 729         else
 730             samples = av_rescale_q(1, samplerate, fps);
 731     } else {
 732         samples = 1000;
 733     }
 734
 735     /* After seeking, audio may catch up with video. */
 736     if (samples <= 0) {
 737         pkt->size = 0;
 738         pkt->data = NULL;
 739         return 0;
 740     }
 741
 742     if (avs->curr_sample + samples > avs->vi->num_audio_samples)
 743         samples = avs->vi->num_audio_samples - avs->curr_sample;
 744
 745     /* This must happen even if the stream is discarded to prevent desync. */
 746     n                 = avs->curr_sample;
 747     avs->curr_sample += samples;
 748     if (discard)
 749         return 0;
 750
 751     pkt->size = avs_bytes_per_channel_sample(avs->vi) *
 752                 samples * avs->vi->nchannels;
 753     if (!pkt->size)
 754         return AVERROR_UNKNOWN;
 755
 756     if (av_new_packet(pkt, pkt->size) < 0)
 757         return AVERROR(ENOMEM);
 758
 759     pkt->pts      = n;
 760     pkt->dts      = n;
 761     pkt->duration = samples;
 762     pkt->stream_index = avs->curr_stream;
 763
 764     avs_library.avs_get_audio(avs->clip, pkt->data, n, samples);
 765     error = avs_library.avs_clip_get_error(avs->clip);
 766     if (error) {
 767         av_log(s, AV_LOG_ERROR, "%s\n", error);
 768         avs->error = 1;
 769         av_packet_unref(pkt);
 770         return AVERROR_UNKNOWN;
 771     }
 772     return 0;
 773 }
 774
 775 static av_cold int avisynth_read_header(AVFormatContext *s)
 776 {
 777     int ret;
 778
 779     // Calling library must implement a lock for thread-safe opens.
 780     if (ret = avpriv_lock_avformat())
 781         return ret;
 782
 783     if (ret = avisynth_open_file(s)) {
 784         avpriv_unlock_avformat();
 785         return ret;
 786     }
 787
 788     avpriv_unlock_avformat();
 789     return 0;
 790 }
 791
 792 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 793 {
 794     AviSynthContext *avs = s->priv_data;
 795     AVStream *st;
 796     int discard = 0;
 797     int ret;
 798
 799     if (avs->error)
 800         return AVERROR_UNKNOWN;
 801
 802     /* If either stream reaches EOF, try to read the other one before
 803      * giving up. */
 804     avisynth_next_stream(s, &st, pkt, &discard);
 805     if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 806         ret = avisynth_read_packet_video(s, pkt, discard);
 807         if (ret == AVERROR_EOF && avs_has_audio(avs->vi)) {
 808             avisynth_next_stream(s, &st, pkt, &discard);
 809             return avisynth_read_packet_audio(s, pkt, discard);
 810         }
 811     } else {
 812         ret = avisynth_read_packet_audio(s, pkt, discard);
 813         if (ret == AVERROR_EOF && avs_has_video(avs->vi)) {
 814             avisynth_next_stream(s, &st, pkt, &discard);
 815             return avisynth_read_packet_video(s, pkt, discard);
 816         }
 817     }
 818
 819     return ret;
 820 }
 821
 822 static av_cold int avisynth_read_close(AVFormatContext *s)
 823 {
 824     if (avpriv_lock_avformat())
 825         return AVERROR_UNKNOWN;
 826
 827     avisynth_context_destroy(s->priv_data);
 828     avpriv_unlock_avformat();
 829     return 0;
 830 }
 831
 832 static int avisynth_read_seek(AVFormatContext *s, int stream_index,
 833                               int64_t timestamp, int flags)
 834 {
 835     AviSynthContext *avs = s->priv_data;
 836     AVStream *st;
 837     AVRational fps, samplerate;
 838
 839     if (avs->error)
 840         return AVERROR_UNKNOWN;
 841
 842     fps        = (AVRational) { avs->vi->fps_numerator,
 843                                 avs->vi->fps_denominator };
 844     samplerate = (AVRational) { avs->vi->audio_samples_per_second, 1 };
 845
 846     st = s->streams[stream_index];
 847     if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 848         /* AviSynth frame counts are signed int. */
 849         if ((timestamp >= avs->vi->num_frames) ||
 850             (timestamp > INT_MAX)              ||
 851             (timestamp < 0))
 852             return AVERROR_EOF;
 853         avs->curr_frame = timestamp;
 854         if (avs_has_audio(avs->vi))
 855             avs->curr_sample = av_rescale_q(timestamp, samplerate, fps);
 856     } else {
 857         if ((timestamp >= avs->vi->num_audio_samples) || (timestamp < 0))
 858             return AVERROR_EOF;
 859         /* Force frame granularity for seeking. */
 860         if (avs_has_video(avs->vi)) {
 861             avs->curr_frame  = av_rescale_q(timestamp, fps, samplerate);
 862             avs->curr_sample = av_rescale_q(avs->curr_frame, samplerate, fps);
 863         } else {
 864             avs->curr_sample = timestamp;
 865         }
 866     }
 867
 868     return 0;
 869 }
 870
 871 AVInputFormat ff_avisynth_demuxer = {
 872     .name           = "avisynth",
 873     .long_name      = NULL_IF_CONFIG_SMALL("AviSynth script"),
 874     .priv_data_size = sizeof(AviSynthContext),
 875     .read_header    = avisynth_read_header,
 876     .read_packet    = avisynth_read_packet,
 877     .read_close     = avisynth_read_close,
 878     .read_seek      = avisynth_read_seek,
 879     .extensions     = "avs",
 880 };