| 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 | |
| 26 | /* Enable function pointer definitions for runtime loading. */ |
| 27 | #define AVSC_NO_DECLSPEC |
| 28 | |
| 29 | /* Platform-specific directives for AviSynth vs AvxSynth. */ |
| 30 | #ifdef _WIN32 |
| 31 | #include <windows.h> |
| 32 | #undef EXTERN_C |
| 33 | #include "compat/avisynth/avisynth_c.h" |
| 34 | #include "compat/avisynth/avisynth_c_25.h" |
| 35 | #define AVISYNTH_LIB "avisynth" |
| 36 | #define USING_AVISYNTH |
| 37 | #else |
| 38 | #include <dlfcn.h> |
| 39 | #include "compat/avisynth/avxsynth_c.h" |
| 40 | #if defined (__APPLE__) |
| 41 | #define AVISYNTH_LIB "libavxsynth.dylib" |
| 42 | #else |
| 43 | #define AVISYNTH_LIB "libavxsynth.so" |
| 44 | #endif |
| 45 | |
| 46 | #define LoadLibrary(x) dlopen(x, RTLD_NOW | RTLD_GLOBAL) |
| 47 | #define GetProcAddress dlsym |
| 48 | #define FreeLibrary dlclose |
| 49 | #endif |
| 50 | |
| 51 | typedef struct AviSynthLibrary { |
| 52 | void *library; |
| 53 | #define AVSC_DECLARE_FUNC(name) name ## _func name |
| 54 | AVSC_DECLARE_FUNC(avs_bit_blt); |
| 55 | AVSC_DECLARE_FUNC(avs_clip_get_error); |
| 56 | AVSC_DECLARE_FUNC(avs_create_script_environment); |
| 57 | AVSC_DECLARE_FUNC(avs_delete_script_environment); |
| 58 | AVSC_DECLARE_FUNC(avs_get_audio); |
| 59 | AVSC_DECLARE_FUNC(avs_get_error); |
| 60 | AVSC_DECLARE_FUNC(avs_get_frame); |
| 61 | AVSC_DECLARE_FUNC(avs_get_version); |
| 62 | AVSC_DECLARE_FUNC(avs_get_video_info); |
| 63 | AVSC_DECLARE_FUNC(avs_invoke); |
| 64 | AVSC_DECLARE_FUNC(avs_release_clip); |
| 65 | AVSC_DECLARE_FUNC(avs_release_value); |
| 66 | AVSC_DECLARE_FUNC(avs_release_video_frame); |
| 67 | AVSC_DECLARE_FUNC(avs_take_clip); |
| 68 | #undef AVSC_DECLARE_FUNC |
| 69 | } AviSynthLibrary; |
| 70 | |
| 71 | typedef struct AviSynthContext { |
| 72 | AVS_ScriptEnvironment *env; |
| 73 | AVS_Clip *clip; |
| 74 | const AVS_VideoInfo *vi; |
| 75 | |
| 76 | /* avisynth_read_packet_video() iterates over this. */ |
| 77 | int n_planes; |
| 78 | const int *planes; |
| 79 | |
| 80 | int curr_stream; |
| 81 | int curr_frame; |
| 82 | int64_t curr_sample; |
| 83 | |
| 84 | int error; |
| 85 | |
| 86 | /* Linked list pointers. */ |
| 87 | struct AviSynthContext *next; |
| 88 | } AviSynthContext; |
| 89 | |
| 90 | static const int avs_planes_packed[1] = { 0 }; |
| 91 | static const int avs_planes_grey[1] = { AVS_PLANAR_Y }; |
| 92 | static const int avs_planes_yuv[3] = { AVS_PLANAR_Y, AVS_PLANAR_U, |
| 93 | AVS_PLANAR_V }; |
| 94 | |
| 95 | /* A conflict between C++ global objects, atexit, and dynamic loading requires |
| 96 | * us to register our own atexit handler to prevent double freeing. */ |
| 97 | static AviSynthLibrary avs_library; |
| 98 | static int avs_atexit_called = 0; |
| 99 | |
| 100 | /* Linked list of AviSynthContexts. An atexit handler destroys this list. */ |
| 101 | static AviSynthContext *avs_ctx_list = NULL; |
| 102 | |
| 103 | static av_cold void avisynth_atexit_handler(void); |
| 104 | |
| 105 | static av_cold int avisynth_load_library(void) |
| 106 | { |
| 107 | avs_library.library = LoadLibrary(AVISYNTH_LIB); |
| 108 | if (!avs_library.library) |
| 109 | return AVERROR_UNKNOWN; |
| 110 | |
| 111 | #define LOAD_AVS_FUNC(name, continue_on_fail) \ |
| 112 | avs_library.name = \ |
| 113 | (void *)GetProcAddress(avs_library.library, #name); \ |
| 114 | if (!continue_on_fail && !avs_library.name) \ |
| 115 | goto fail; |
| 116 | |
| 117 | LOAD_AVS_FUNC(avs_bit_blt, 0); |
| 118 | LOAD_AVS_FUNC(avs_clip_get_error, 0); |
| 119 | LOAD_AVS_FUNC(avs_create_script_environment, 0); |
| 120 | LOAD_AVS_FUNC(avs_delete_script_environment, 0); |
| 121 | LOAD_AVS_FUNC(avs_get_audio, 0); |
| 122 | LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6 |
| 123 | LOAD_AVS_FUNC(avs_get_frame, 0); |
| 124 | LOAD_AVS_FUNC(avs_get_version, 0); |
| 125 | LOAD_AVS_FUNC(avs_get_video_info, 0); |
| 126 | LOAD_AVS_FUNC(avs_invoke, 0); |
| 127 | LOAD_AVS_FUNC(avs_release_clip, 0); |
| 128 | LOAD_AVS_FUNC(avs_release_value, 0); |
| 129 | LOAD_AVS_FUNC(avs_release_video_frame, 0); |
| 130 | LOAD_AVS_FUNC(avs_take_clip, 0); |
| 131 | #undef LOAD_AVS_FUNC |
| 132 | |
| 133 | atexit(avisynth_atexit_handler); |
| 134 | return 0; |
| 135 | |
| 136 | fail: |
| 137 | FreeLibrary(avs_library.library); |
| 138 | return AVERROR_UNKNOWN; |
| 139 | } |
| 140 | |
| 141 | /* Note that avisynth_context_create and avisynth_context_destroy |
| 142 | * do not allocate or free the actual context! That is taken care of |
| 143 | * by libavformat. */ |
| 144 | static av_cold int avisynth_context_create(AVFormatContext *s) |
| 145 | { |
| 146 | AviSynthContext *avs = s->priv_data; |
| 147 | int ret; |
| 148 | |
| 149 | if (!avs_library.library) |
| 150 | if (ret = avisynth_load_library()) |
| 151 | return ret; |
| 152 | |
| 153 | avs->env = avs_library.avs_create_script_environment(3); |
| 154 | if (avs_library.avs_get_error) { |
| 155 | const char *error = avs_library.avs_get_error(avs->env); |
| 156 | if (error) { |
| 157 | av_log(s, AV_LOG_ERROR, "%s\n", error); |
| 158 | return AVERROR_UNKNOWN; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | if (!avs_ctx_list) { |
| 163 | avs_ctx_list = avs; |
| 164 | } else { |
| 165 | avs->next = avs_ctx_list; |
| 166 | avs_ctx_list = avs; |
| 167 | } |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static av_cold void avisynth_context_destroy(AviSynthContext *avs) |
| 173 | { |
| 174 | if (avs_atexit_called) |
| 175 | return; |
| 176 | |
| 177 | if (avs == avs_ctx_list) { |
| 178 | avs_ctx_list = avs->next; |
| 179 | } else { |
| 180 | AviSynthContext *prev = avs_ctx_list; |
| 181 | while (prev->next != avs) |
| 182 | prev = prev->next; |
| 183 | prev->next = avs->next; |
| 184 | } |
| 185 | |
| 186 | if (avs->clip) { |
| 187 | avs_library.avs_release_clip(avs->clip); |
| 188 | avs->clip = NULL; |
| 189 | } |
| 190 | if (avs->env) { |
| 191 | avs_library.avs_delete_script_environment(avs->env); |
| 192 | avs->env = NULL; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | static av_cold void avisynth_atexit_handler(void) |
| 197 | { |
| 198 | AviSynthContext *avs = avs_ctx_list; |
| 199 | |
| 200 | while (avs) { |
| 201 | AviSynthContext *next = avs->next; |
| 202 | avisynth_context_destroy(avs); |
| 203 | avs = next; |
| 204 | } |
| 205 | FreeLibrary(avs_library.library); |
| 206 | |
| 207 | avs_atexit_called = 1; |
| 208 | } |
| 209 | |
| 210 | /* Create AVStream from audio and video data. */ |
| 211 | static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st) |
| 212 | { |
| 213 | AviSynthContext *avs = s->priv_data; |
| 214 | int planar = 0; // 0: packed, 1: YUV, 2: Y8 |
| 215 | |
| 216 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 217 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
| 218 | st->codec->width = avs->vi->width; |
| 219 | st->codec->height = avs->vi->height; |
| 220 | |
| 221 | st->time_base = (AVRational) { avs->vi->fps_denominator, |
| 222 | avs->vi->fps_numerator }; |
| 223 | st->avg_frame_rate = (AVRational) { avs->vi->fps_numerator, |
| 224 | avs->vi->fps_denominator }; |
| 225 | st->start_time = 0; |
| 226 | st->duration = avs->vi->num_frames; |
| 227 | st->nb_frames = avs->vi->num_frames; |
| 228 | |
| 229 | switch (avs->vi->pixel_type) { |
| 230 | #ifdef USING_AVISYNTH |
| 231 | case AVS_CS_YV24: |
| 232 | st->codec->pix_fmt = AV_PIX_FMT_YUV444P; |
| 233 | planar = 1; |
| 234 | break; |
| 235 | case AVS_CS_YV16: |
| 236 | st->codec->pix_fmt = AV_PIX_FMT_YUV422P; |
| 237 | planar = 1; |
| 238 | break; |
| 239 | case AVS_CS_YV411: |
| 240 | st->codec->pix_fmt = AV_PIX_FMT_YUV411P; |
| 241 | planar = 1; |
| 242 | break; |
| 243 | case AVS_CS_Y8: |
| 244 | st->codec->pix_fmt = AV_PIX_FMT_GRAY8; |
| 245 | planar = 2; |
| 246 | break; |
| 247 | #endif |
| 248 | case AVS_CS_BGR24: |
| 249 | st->codec->pix_fmt = AV_PIX_FMT_BGR24; |
| 250 | break; |
| 251 | case AVS_CS_BGR32: |
| 252 | st->codec->pix_fmt = AV_PIX_FMT_RGB32; |
| 253 | break; |
| 254 | case AVS_CS_YUY2: |
| 255 | st->codec->pix_fmt = AV_PIX_FMT_YUYV422; |
| 256 | break; |
| 257 | case AVS_CS_YV12: |
| 258 | st->codec->pix_fmt = AV_PIX_FMT_YUV420P; |
| 259 | planar = 1; |
| 260 | break; |
| 261 | case AVS_CS_I420: // Is this even used anywhere? |
| 262 | st->codec->pix_fmt = AV_PIX_FMT_YUV420P; |
| 263 | planar = 1; |
| 264 | break; |
| 265 | default: |
| 266 | av_log(s, AV_LOG_ERROR, |
| 267 | "unknown AviSynth colorspace %d\n", avs->vi->pixel_type); |
| 268 | avs->error = 1; |
| 269 | return AVERROR_UNKNOWN; |
| 270 | } |
| 271 | |
| 272 | switch (planar) { |
| 273 | case 2: // Y8 |
| 274 | avs->n_planes = 1; |
| 275 | avs->planes = avs_planes_grey; |
| 276 | break; |
| 277 | case 1: // YUV |
| 278 | avs->n_planes = 3; |
| 279 | avs->planes = avs_planes_yuv; |
| 280 | break; |
| 281 | default: |
| 282 | avs->n_planes = 1; |
| 283 | avs->planes = avs_planes_packed; |
| 284 | } |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st) |
| 289 | { |
| 290 | AviSynthContext *avs = s->priv_data; |
| 291 | |
| 292 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 293 | st->codec->sample_rate = avs->vi->audio_samples_per_second; |
| 294 | st->codec->channels = avs->vi->nchannels; |
| 295 | st->time_base = (AVRational) { 1, |
| 296 | avs->vi->audio_samples_per_second }; |
| 297 | st->duration = avs->vi->num_audio_samples; |
| 298 | |
| 299 | switch (avs->vi->sample_type) { |
| 300 | case AVS_SAMPLE_INT8: |
| 301 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
| 302 | break; |
| 303 | case AVS_SAMPLE_INT16: |
| 304 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
| 305 | break; |
| 306 | case AVS_SAMPLE_INT24: |
| 307 | st->codec->codec_id = AV_CODEC_ID_PCM_S24LE; |
| 308 | break; |
| 309 | case AVS_SAMPLE_INT32: |
| 310 | st->codec->codec_id = AV_CODEC_ID_PCM_S32LE; |
| 311 | break; |
| 312 | case AVS_SAMPLE_FLOAT: |
| 313 | st->codec->codec_id = AV_CODEC_ID_PCM_F32LE; |
| 314 | break; |
| 315 | default: |
| 316 | av_log(s, AV_LOG_ERROR, |
| 317 | "unknown AviSynth sample type %d\n", avs->vi->sample_type); |
| 318 | avs->error = 1; |
| 319 | return AVERROR_UNKNOWN; |
| 320 | } |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int avisynth_create_stream(AVFormatContext *s) |
| 325 | { |
| 326 | AviSynthContext *avs = s->priv_data; |
| 327 | AVStream *st; |
| 328 | int ret; |
| 329 | int id = 0; |
| 330 | |
| 331 | if (avs_has_video(avs->vi)) { |
| 332 | st = avformat_new_stream(s, NULL); |
| 333 | if (!st) |
| 334 | return AVERROR_UNKNOWN; |
| 335 | st->id = id++; |
| 336 | if (ret = avisynth_create_stream_video(s, st)) |
| 337 | return ret; |
| 338 | } |
| 339 | if (avs_has_audio(avs->vi)) { |
| 340 | st = avformat_new_stream(s, NULL); |
| 341 | if (!st) |
| 342 | return AVERROR_UNKNOWN; |
| 343 | st->id = id++; |
| 344 | if (ret = avisynth_create_stream_audio(s, st)) |
| 345 | return ret; |
| 346 | } |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static int avisynth_open_file(AVFormatContext *s) |
| 351 | { |
| 352 | AviSynthContext *avs = s->priv_data; |
| 353 | AVS_Value arg, val; |
| 354 | int ret; |
| 355 | #ifdef USING_AVISYNTH |
| 356 | char filename_ansi[MAX_PATH * 4]; |
| 357 | wchar_t filename_wc[MAX_PATH * 4]; |
| 358 | #endif |
| 359 | |
| 360 | if (ret = avisynth_context_create(s)) |
| 361 | return ret; |
| 362 | |
| 363 | #ifdef USING_AVISYNTH |
| 364 | /* Convert UTF-8 to ANSI code page */ |
| 365 | MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4); |
| 366 | WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi, |
| 367 | MAX_PATH * 4, NULL, NULL); |
| 368 | arg = avs_new_value_string(filename_ansi); |
| 369 | #else |
| 370 | arg = avs_new_value_string(s->filename); |
| 371 | #endif |
| 372 | val = avs_library.avs_invoke(avs->env, "Import", arg, 0); |
| 373 | if (avs_is_error(val)) { |
| 374 | av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val)); |
| 375 | ret = AVERROR_UNKNOWN; |
| 376 | goto fail; |
| 377 | } |
| 378 | if (!avs_is_clip(val)) { |
| 379 | av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n"); |
| 380 | ret = AVERROR_UNKNOWN; |
| 381 | goto fail; |
| 382 | } |
| 383 | |
| 384 | avs->clip = avs_library.avs_take_clip(val, avs->env); |
| 385 | avs->vi = avs_library.avs_get_video_info(avs->clip); |
| 386 | |
| 387 | /* Release the AVS_Value as it will go out of scope. */ |
| 388 | avs_library.avs_release_value(val); |
| 389 | |
| 390 | if (ret = avisynth_create_stream(s)) |
| 391 | goto fail; |
| 392 | |
| 393 | return 0; |
| 394 | |
| 395 | fail: |
| 396 | avisynth_context_destroy(avs); |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | static void avisynth_next_stream(AVFormatContext *s, AVStream **st, |
| 401 | AVPacket *pkt, int *discard) |
| 402 | { |
| 403 | AviSynthContext *avs = s->priv_data; |
| 404 | |
| 405 | avs->curr_stream++; |
| 406 | avs->curr_stream %= s->nb_streams; |
| 407 | |
| 408 | *st = s->streams[avs->curr_stream]; |
| 409 | if ((*st)->discard == AVDISCARD_ALL) |
| 410 | *discard = 1; |
| 411 | else |
| 412 | *discard = 0; |
| 413 | |
| 414 | return; |
| 415 | } |
| 416 | |
| 417 | /* Copy AviSynth clip data into an AVPacket. */ |
| 418 | static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt, |
| 419 | int discard) |
| 420 | { |
| 421 | AviSynthContext *avs = s->priv_data; |
| 422 | AVS_VideoFrame *frame; |
| 423 | unsigned char *dst_p; |
| 424 | const unsigned char *src_p; |
| 425 | int n, i, plane, rowsize, planeheight, pitch, bits; |
| 426 | const char *error; |
| 427 | |
| 428 | if (avs->curr_frame >= avs->vi->num_frames) |
| 429 | return AVERROR_EOF; |
| 430 | |
| 431 | /* This must happen even if the stream is discarded to prevent desync. */ |
| 432 | n = avs->curr_frame++; |
| 433 | if (discard) |
| 434 | return 0; |
| 435 | |
| 436 | #ifdef USING_AVISYNTH |
| 437 | /* Define the bpp values for the new AviSynth 2.6 colorspaces. |
| 438 | * Since AvxSynth doesn't have these functions, special-case |
| 439 | * it in order to avoid implicit declaration errors. */ |
| 440 | |
| 441 | if (avs_is_yv24(avs->vi)) |
| 442 | bits = 24; |
| 443 | else if (avs_is_yv16(avs->vi)) |
| 444 | bits = 16; |
| 445 | else if (avs_is_yv411(avs->vi)) |
| 446 | bits = 12; |
| 447 | else if (avs_is_y8(avs->vi)) |
| 448 | bits = 8; |
| 449 | else |
| 450 | #endif |
| 451 | bits = avs_bits_per_pixel(avs->vi); |
| 452 | |
| 453 | /* Without the cast to int64_t, calculation overflows at about 9k x 9k |
| 454 | * resolution. */ |
| 455 | pkt->size = (((int64_t)avs->vi->width * |
| 456 | (int64_t)avs->vi->height) * bits) / 8; |
| 457 | if (!pkt->size) |
| 458 | return AVERROR_UNKNOWN; |
| 459 | |
| 460 | if (av_new_packet(pkt, pkt->size) < 0) |
| 461 | return AVERROR(ENOMEM); |
| 462 | |
| 463 | pkt->pts = n; |
| 464 | pkt->dts = n; |
| 465 | pkt->duration = 1; |
| 466 | pkt->stream_index = avs->curr_stream; |
| 467 | |
| 468 | frame = avs_library.avs_get_frame(avs->clip, n); |
| 469 | error = avs_library.avs_clip_get_error(avs->clip); |
| 470 | if (error) { |
| 471 | av_log(s, AV_LOG_ERROR, "%s\n", error); |
| 472 | avs->error = 1; |
| 473 | av_packet_unref(pkt); |
| 474 | return AVERROR_UNKNOWN; |
| 475 | } |
| 476 | |
| 477 | dst_p = pkt->data; |
| 478 | for (i = 0; i < avs->n_planes; i++) { |
| 479 | plane = avs->planes[i]; |
| 480 | src_p = avs_get_read_ptr_p(frame, plane); |
| 481 | pitch = avs_get_pitch_p(frame, plane); |
| 482 | |
| 483 | #ifdef USING_AVISYNTH |
| 484 | if (avs_library.avs_get_version(avs->clip) == 3) { |
| 485 | rowsize = avs_get_row_size_p_25(frame, plane); |
| 486 | planeheight = avs_get_height_p_25(frame, plane); |
| 487 | } else { |
| 488 | rowsize = avs_get_row_size_p(frame, plane); |
| 489 | planeheight = avs_get_height_p(frame, plane); |
| 490 | } |
| 491 | #else |
| 492 | rowsize = avs_get_row_size_p(frame, plane); |
| 493 | planeheight = avs_get_height_p(frame, plane); |
| 494 | #endif |
| 495 | |
| 496 | /* Flip RGB video. */ |
| 497 | if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) { |
| 498 | src_p = src_p + (planeheight - 1) * pitch; |
| 499 | pitch = -pitch; |
| 500 | } |
| 501 | |
| 502 | avs_library.avs_bit_blt(avs->env, dst_p, rowsize, src_p, pitch, |
| 503 | rowsize, planeheight); |
| 504 | dst_p += rowsize * planeheight; |
| 505 | } |
| 506 | |
| 507 | avs_library.avs_release_video_frame(frame); |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | static int avisynth_read_packet_audio(AVFormatContext *s, AVPacket *pkt, |
| 512 | int discard) |
| 513 | { |
| 514 | AviSynthContext *avs = s->priv_data; |
| 515 | AVRational fps, samplerate; |
| 516 | int samples; |
| 517 | int64_t n; |
| 518 | const char *error; |
| 519 | |
| 520 | if (avs->curr_sample >= avs->vi->num_audio_samples) |
| 521 | return AVERROR_EOF; |
| 522 | |
| 523 | fps.num = avs->vi->fps_numerator; |
| 524 | fps.den = avs->vi->fps_denominator; |
| 525 | samplerate.num = avs->vi->audio_samples_per_second; |
| 526 | samplerate.den = 1; |
| 527 | |
| 528 | if (avs_has_video(avs->vi)) { |
| 529 | if (avs->curr_frame < avs->vi->num_frames) |
| 530 | samples = av_rescale_q(avs->curr_frame, samplerate, fps) - |
| 531 | avs->curr_sample; |
| 532 | else |
| 533 | samples = av_rescale_q(1, samplerate, fps); |
| 534 | } else { |
| 535 | samples = 1000; |
| 536 | } |
| 537 | |
| 538 | /* After seeking, audio may catch up with video. */ |
| 539 | if (samples <= 0) { |
| 540 | pkt->size = 0; |
| 541 | pkt->data = NULL; |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | if (avs->curr_sample + samples > avs->vi->num_audio_samples) |
| 546 | samples = avs->vi->num_audio_samples - avs->curr_sample; |
| 547 | |
| 548 | /* This must happen even if the stream is discarded to prevent desync. */ |
| 549 | n = avs->curr_sample; |
| 550 | avs->curr_sample += samples; |
| 551 | if (discard) |
| 552 | return 0; |
| 553 | |
| 554 | pkt->size = avs_bytes_per_channel_sample(avs->vi) * |
| 555 | samples * avs->vi->nchannels; |
| 556 | if (!pkt->size) |
| 557 | return AVERROR_UNKNOWN; |
| 558 | |
| 559 | if (av_new_packet(pkt, pkt->size) < 0) |
| 560 | return AVERROR(ENOMEM); |
| 561 | |
| 562 | pkt->pts = n; |
| 563 | pkt->dts = n; |
| 564 | pkt->duration = samples; |
| 565 | pkt->stream_index = avs->curr_stream; |
| 566 | |
| 567 | avs_library.avs_get_audio(avs->clip, pkt->data, n, samples); |
| 568 | error = avs_library.avs_clip_get_error(avs->clip); |
| 569 | if (error) { |
| 570 | av_log(s, AV_LOG_ERROR, "%s\n", error); |
| 571 | avs->error = 1; |
| 572 | av_packet_unref(pkt); |
| 573 | return AVERROR_UNKNOWN; |
| 574 | } |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static av_cold int avisynth_read_header(AVFormatContext *s) |
| 579 | { |
| 580 | int ret; |
| 581 | |
| 582 | // Calling library must implement a lock for thread-safe opens. |
| 583 | if (ret = avpriv_lock_avformat()) |
| 584 | return ret; |
| 585 | |
| 586 | if (ret = avisynth_open_file(s)) { |
| 587 | avpriv_unlock_avformat(); |
| 588 | return ret; |
| 589 | } |
| 590 | |
| 591 | avpriv_unlock_avformat(); |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 596 | { |
| 597 | AviSynthContext *avs = s->priv_data; |
| 598 | AVStream *st; |
| 599 | int discard = 0; |
| 600 | int ret; |
| 601 | |
| 602 | if (avs->error) |
| 603 | return AVERROR_UNKNOWN; |
| 604 | |
| 605 | /* If either stream reaches EOF, try to read the other one before |
| 606 | * giving up. */ |
| 607 | avisynth_next_stream(s, &st, pkt, &discard); |
| 608 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 609 | ret = avisynth_read_packet_video(s, pkt, discard); |
| 610 | if (ret == AVERROR_EOF && avs_has_audio(avs->vi)) { |
| 611 | avisynth_next_stream(s, &st, pkt, &discard); |
| 612 | return avisynth_read_packet_audio(s, pkt, discard); |
| 613 | } |
| 614 | } else { |
| 615 | ret = avisynth_read_packet_audio(s, pkt, discard); |
| 616 | if (ret == AVERROR_EOF && avs_has_video(avs->vi)) { |
| 617 | avisynth_next_stream(s, &st, pkt, &discard); |
| 618 | return avisynth_read_packet_video(s, pkt, discard); |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | static av_cold int avisynth_read_close(AVFormatContext *s) |
| 626 | { |
| 627 | if (avpriv_lock_avformat()) |
| 628 | return AVERROR_UNKNOWN; |
| 629 | |
| 630 | avisynth_context_destroy(s->priv_data); |
| 631 | avpriv_unlock_avformat(); |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | static int avisynth_read_seek(AVFormatContext *s, int stream_index, |
| 636 | int64_t timestamp, int flags) |
| 637 | { |
| 638 | AviSynthContext *avs = s->priv_data; |
| 639 | AVStream *st; |
| 640 | AVRational fps, samplerate; |
| 641 | |
| 642 | if (avs->error) |
| 643 | return AVERROR_UNKNOWN; |
| 644 | |
| 645 | fps = (AVRational) { avs->vi->fps_numerator, |
| 646 | avs->vi->fps_denominator }; |
| 647 | samplerate = (AVRational) { avs->vi->audio_samples_per_second, 1 }; |
| 648 | |
| 649 | st = s->streams[stream_index]; |
| 650 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 651 | /* AviSynth frame counts are signed int. */ |
| 652 | if ((timestamp >= avs->vi->num_frames) || |
| 653 | (timestamp > INT_MAX) || |
| 654 | (timestamp < 0)) |
| 655 | return AVERROR_EOF; |
| 656 | avs->curr_frame = timestamp; |
| 657 | if (avs_has_audio(avs->vi)) |
| 658 | avs->curr_sample = av_rescale_q(timestamp, samplerate, fps); |
| 659 | } else { |
| 660 | if ((timestamp >= avs->vi->num_audio_samples) || (timestamp < 0)) |
| 661 | return AVERROR_EOF; |
| 662 | /* Force frame granularity for seeking. */ |
| 663 | if (avs_has_video(avs->vi)) { |
| 664 | avs->curr_frame = av_rescale_q(timestamp, fps, samplerate); |
| 665 | avs->curr_sample = av_rescale_q(avs->curr_frame, samplerate, fps); |
| 666 | } else { |
| 667 | avs->curr_sample = timestamp; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | AVInputFormat ff_avisynth_demuxer = { |
| 675 | .name = "avisynth", |
| 676 | .long_name = NULL_IF_CONFIG_SMALL("AviSynth script"), |
| 677 | .priv_data_size = sizeof(AviSynthContext), |
| 678 | .read_header = avisynth_read_header, |
| 679 | .read_packet = avisynth_read_packet, |
| 680 | .read_close = avisynth_read_close, |
| 681 | .read_seek = avisynth_read_seek, |
| 682 | .extensions = "avs", |
| 683 | }; |