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![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '247aa7af7d8197247c181e3fbfe8d93d75e41b29': avisynth: Simplify shared library name construction Conflicts: libavformat/avisynth.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
717 lines
21 KiB
C
717 lines
21 KiB
C
/*
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* AviSynth/AvxSynth support
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* Copyright (c) 2012 AvxSynth Team.
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*
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* This file is part of FFmpeg
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/internal.h"
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#include "libavcodec/internal.h"
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#include "avformat.h"
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#include "internal.h"
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#include "config.h"
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/* Enable function pointer definitions for runtime loading. */
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#define AVSC_NO_DECLSPEC
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/* Platform-specific directives for AviSynth vs AvxSynth. */
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#ifdef _WIN32
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#include <windows.h>
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#undef EXTERN_C
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#include "compat/avisynth/avisynth_c.h"
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#define AVISYNTH_LIB "avisynth"
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#define USING_AVISYNTH
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#else
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#include <dlfcn.h>
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#include "compat/avisynth/avxsynth_c.h"
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#define AVISYNTH_NAME "libavxsynth"
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#define AVISYNTH_LIB AVISYNTH_NAME SLIBSUF
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#define LoadLibrary(x) dlopen(x, RTLD_NOW | RTLD_LOCAL)
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#define GetProcAddress dlsym
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#define FreeLibrary dlclose
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#endif
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typedef struct AviSynthLibrary {
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void *library;
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#define AVSC_DECLARE_FUNC(name) name ## _func name
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AVSC_DECLARE_FUNC(avs_bit_blt);
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AVSC_DECLARE_FUNC(avs_clip_get_error);
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AVSC_DECLARE_FUNC(avs_create_script_environment);
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AVSC_DECLARE_FUNC(avs_delete_script_environment);
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AVSC_DECLARE_FUNC(avs_get_audio);
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AVSC_DECLARE_FUNC(avs_get_error);
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AVSC_DECLARE_FUNC(avs_get_frame);
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AVSC_DECLARE_FUNC(avs_get_version);
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AVSC_DECLARE_FUNC(avs_get_video_info);
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AVSC_DECLARE_FUNC(avs_invoke);
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AVSC_DECLARE_FUNC(avs_release_clip);
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AVSC_DECLARE_FUNC(avs_release_value);
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AVSC_DECLARE_FUNC(avs_release_video_frame);
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AVSC_DECLARE_FUNC(avs_take_clip);
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#ifdef USING_AVISYNTH
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AVSC_DECLARE_FUNC(avs_bits_per_pixel);
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AVSC_DECLARE_FUNC(avs_get_height_p);
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AVSC_DECLARE_FUNC(avs_get_pitch_p);
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AVSC_DECLARE_FUNC(avs_get_read_ptr_p);
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AVSC_DECLARE_FUNC(avs_get_row_size_p);
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AVSC_DECLARE_FUNC(avs_is_yv24);
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AVSC_DECLARE_FUNC(avs_is_yv16);
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AVSC_DECLARE_FUNC(avs_is_yv411);
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AVSC_DECLARE_FUNC(avs_is_y8);
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#endif
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#undef AVSC_DECLARE_FUNC
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} AviSynthLibrary;
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typedef struct AviSynthContext {
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AVS_ScriptEnvironment *env;
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AVS_Clip *clip;
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const AVS_VideoInfo *vi;
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/* avisynth_read_packet_video() iterates over this. */
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int n_planes;
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const int *planes;
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int curr_stream;
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int curr_frame;
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int64_t curr_sample;
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int error;
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/* Linked list pointers. */
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struct AviSynthContext *next;
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} AviSynthContext;
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static const int avs_planes_packed[1] = { 0 };
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static const int avs_planes_grey[1] = { AVS_PLANAR_Y };
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static const int avs_planes_yuv[3] = { AVS_PLANAR_Y, AVS_PLANAR_U,
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AVS_PLANAR_V };
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/* A conflict between C++ global objects, atexit, and dynamic loading requires
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* us to register our own atexit handler to prevent double freeing. */
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static AviSynthLibrary avs_library;
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static int avs_atexit_called = 0;
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/* Linked list of AviSynthContexts. An atexit handler destroys this list. */
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static AviSynthContext *avs_ctx_list = NULL;
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static av_cold void avisynth_atexit_handler(void);
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static av_cold int avisynth_load_library(void)
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{
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avs_library.library = LoadLibrary(AVISYNTH_LIB);
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if (!avs_library.library)
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return AVERROR_UNKNOWN;
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#define LOAD_AVS_FUNC(name, continue_on_fail) \
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avs_library.name = \
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(void *)GetProcAddress(avs_library.library, #name); \
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if (!continue_on_fail && !avs_library.name) \
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goto fail;
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LOAD_AVS_FUNC(avs_bit_blt, 0);
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LOAD_AVS_FUNC(avs_clip_get_error, 0);
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LOAD_AVS_FUNC(avs_create_script_environment, 0);
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LOAD_AVS_FUNC(avs_delete_script_environment, 0);
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LOAD_AVS_FUNC(avs_get_audio, 0);
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LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6
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LOAD_AVS_FUNC(avs_get_frame, 0);
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LOAD_AVS_FUNC(avs_get_version, 0);
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LOAD_AVS_FUNC(avs_get_video_info, 0);
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LOAD_AVS_FUNC(avs_invoke, 0);
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LOAD_AVS_FUNC(avs_release_clip, 0);
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LOAD_AVS_FUNC(avs_release_value, 0);
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LOAD_AVS_FUNC(avs_release_video_frame, 0);
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LOAD_AVS_FUNC(avs_take_clip, 0);
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#ifdef USING_AVISYNTH
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LOAD_AVS_FUNC(avs_bits_per_pixel, 1);
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LOAD_AVS_FUNC(avs_get_height_p, 1);
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LOAD_AVS_FUNC(avs_get_pitch_p, 1);
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LOAD_AVS_FUNC(avs_get_read_ptr_p, 1);
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LOAD_AVS_FUNC(avs_get_row_size_p, 1);
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LOAD_AVS_FUNC(avs_is_yv24, 1);
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LOAD_AVS_FUNC(avs_is_yv16, 1);
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LOAD_AVS_FUNC(avs_is_yv411, 1);
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LOAD_AVS_FUNC(avs_is_y8, 1);
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#endif
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#undef LOAD_AVS_FUNC
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atexit(avisynth_atexit_handler);
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return 0;
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fail:
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FreeLibrary(avs_library.library);
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return AVERROR_UNKNOWN;
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}
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/* Note that avisynth_context_create and avisynth_context_destroy
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* do not allocate or free the actual context! That is taken care of
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* by libavformat. */
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static av_cold int avisynth_context_create(AVFormatContext *s)
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{
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AviSynthContext *avs = s->priv_data;
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int ret;
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if (!avs_library.library)
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if (ret = avisynth_load_library())
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return ret;
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avs->env = avs_library.avs_create_script_environment(3);
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if (avs_library.avs_get_error) {
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const char *error = avs_library.avs_get_error(avs->env);
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if (error) {
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av_log(s, AV_LOG_ERROR, "%s\n", error);
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return AVERROR_UNKNOWN;
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}
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}
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if (!avs_ctx_list) {
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avs_ctx_list = avs;
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} else {
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avs->next = avs_ctx_list;
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avs_ctx_list = avs;
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}
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return 0;
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}
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static av_cold void avisynth_context_destroy(AviSynthContext *avs)
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{
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if (avs_atexit_called)
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return;
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if (avs == avs_ctx_list) {
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avs_ctx_list = avs->next;
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} else {
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AviSynthContext *prev = avs_ctx_list;
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while (prev->next != avs)
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prev = prev->next;
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prev->next = avs->next;
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}
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if (avs->clip) {
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avs_library.avs_release_clip(avs->clip);
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avs->clip = NULL;
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}
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if (avs->env) {
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avs_library.avs_delete_script_environment(avs->env);
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avs->env = NULL;
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}
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}
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static av_cold void avisynth_atexit_handler(void)
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{
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AviSynthContext *avs = avs_ctx_list;
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while (avs) {
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AviSynthContext *next = avs->next;
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avisynth_context_destroy(avs);
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avs = next;
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}
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FreeLibrary(avs_library.library);
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avs_atexit_called = 1;
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}
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/* Create AVStream from audio and video data. */
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static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
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{
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AviSynthContext *avs = s->priv_data;
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int planar = 0; // 0: packed, 1: YUV, 2: Y8
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->codec->width = avs->vi->width;
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st->codec->height = avs->vi->height;
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st->time_base = (AVRational) { avs->vi->fps_denominator,
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avs->vi->fps_numerator };
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st->avg_frame_rate = (AVRational) { avs->vi->fps_numerator,
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avs->vi->fps_denominator };
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st->start_time = 0;
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st->duration = avs->vi->num_frames;
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st->nb_frames = avs->vi->num_frames;
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switch (avs->vi->pixel_type) {
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#ifdef USING_AVISYNTH
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case AVS_CS_YV24:
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st->codec->pix_fmt = AV_PIX_FMT_YUV444P;
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planar = 1;
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break;
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case AVS_CS_YV16:
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st->codec->pix_fmt = AV_PIX_FMT_YUV422P;
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planar = 1;
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break;
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case AVS_CS_YV411:
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st->codec->pix_fmt = AV_PIX_FMT_YUV411P;
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planar = 1;
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break;
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case AVS_CS_Y8:
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st->codec->pix_fmt = AV_PIX_FMT_GRAY8;
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planar = 2;
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break;
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#endif
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case AVS_CS_BGR24:
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st->codec->pix_fmt = AV_PIX_FMT_BGR24;
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break;
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case AVS_CS_BGR32:
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st->codec->pix_fmt = AV_PIX_FMT_RGB32;
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break;
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case AVS_CS_YUY2:
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st->codec->pix_fmt = AV_PIX_FMT_YUYV422;
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break;
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case AVS_CS_YV12:
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st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
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planar = 1;
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break;
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case AVS_CS_I420: // Is this even used anywhere?
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st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
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planar = 1;
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break;
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default:
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av_log(s, AV_LOG_ERROR,
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"unknown AviSynth colorspace %d\n", avs->vi->pixel_type);
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avs->error = 1;
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return AVERROR_UNKNOWN;
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}
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switch (planar) {
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case 2: // Y8
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avs->n_planes = 1;
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avs->planes = avs_planes_grey;
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break;
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case 1: // YUV
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avs->n_planes = 3;
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avs->planes = avs_planes_yuv;
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break;
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default:
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avs->n_planes = 1;
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avs->planes = avs_planes_packed;
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}
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return 0;
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}
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static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st)
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{
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AviSynthContext *avs = s->priv_data;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->sample_rate = avs->vi->audio_samples_per_second;
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st->codec->channels = avs->vi->nchannels;
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st->time_base = (AVRational) { 1,
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avs->vi->audio_samples_per_second };
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st->duration = avs->vi->num_audio_samples;
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switch (avs->vi->sample_type) {
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case AVS_SAMPLE_INT8:
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st->codec->codec_id = AV_CODEC_ID_PCM_U8;
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break;
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case AVS_SAMPLE_INT16:
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st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
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break;
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case AVS_SAMPLE_INT24:
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st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
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break;
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case AVS_SAMPLE_INT32:
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st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
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break;
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case AVS_SAMPLE_FLOAT:
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st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
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break;
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default:
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av_log(s, AV_LOG_ERROR,
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"unknown AviSynth sample type %d\n", avs->vi->sample_type);
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avs->error = 1;
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return AVERROR_UNKNOWN;
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}
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return 0;
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}
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static int avisynth_create_stream(AVFormatContext *s)
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{
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AviSynthContext *avs = s->priv_data;
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AVStream *st;
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int ret;
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int id = 0;
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if (avs_has_video(avs->vi)) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR_UNKNOWN;
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st->id = id++;
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if (ret = avisynth_create_stream_video(s, st))
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return ret;
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}
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if (avs_has_audio(avs->vi)) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR_UNKNOWN;
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st->id = id++;
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if (ret = avisynth_create_stream_audio(s, st))
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return ret;
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}
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return 0;
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}
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static int avisynth_open_file(AVFormatContext *s)
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{
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AviSynthContext *avs = s->priv_data;
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AVS_Value arg, val;
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int ret;
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#ifdef USING_AVISYNTH
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char filename_ansi[MAX_PATH * 4];
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wchar_t filename_wc[MAX_PATH * 4];
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#endif
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if (ret = avisynth_context_create(s))
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return ret;
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#ifdef USING_AVISYNTH
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/* Convert UTF-8 to ANSI code page */
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MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4);
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WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi,
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MAX_PATH * 4, NULL, NULL);
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arg = avs_new_value_string(filename_ansi);
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#else
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arg = avs_new_value_string(s->filename);
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#endif
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val = avs_library.avs_invoke(avs->env, "Import", arg, 0);
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if (avs_is_error(val)) {
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av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val));
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ret = AVERROR_UNKNOWN;
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goto fail;
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}
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if (!avs_is_clip(val)) {
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av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
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ret = AVERROR_UNKNOWN;
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goto fail;
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}
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avs->clip = avs_library.avs_take_clip(val, avs->env);
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avs->vi = avs_library.avs_get_video_info(avs->clip);
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#ifdef USING_AVISYNTH
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/* On Windows, FFmpeg supports AviSynth interface version 6 or higher.
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* This includes AviSynth 2.6 RC1 or higher, and AviSynth+ r1718 or higher,
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* and excludes 2.5 and the 2.6 alphas. Since AvxSynth identifies itself
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* as interface version 3 like 2.5.8, this needs to be special-cased. */
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if (avs_library.avs_get_version(avs->clip) < 6) {
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av_log(s, AV_LOG_ERROR,
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"AviSynth version is too old. Please upgrade to either AviSynth 2.6 >= RC1 or AviSynth+ >= r1718.\n");
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ret = AVERROR_UNKNOWN;
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goto fail;
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}
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#endif
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/* Release the AVS_Value as it will go out of scope. */
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avs_library.avs_release_value(val);
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if (ret = avisynth_create_stream(s))
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goto fail;
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return 0;
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fail:
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avisynth_context_destroy(avs);
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return ret;
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}
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static void avisynth_next_stream(AVFormatContext *s, AVStream **st,
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AVPacket *pkt, int *discard)
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{
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AviSynthContext *avs = s->priv_data;
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avs->curr_stream++;
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avs->curr_stream %= s->nb_streams;
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*st = s->streams[avs->curr_stream];
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if ((*st)->discard == AVDISCARD_ALL)
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*discard = 1;
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else
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*discard = 0;
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return;
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}
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/* Copy AviSynth clip data into an AVPacket. */
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static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
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int discard)
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{
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AviSynthContext *avs = s->priv_data;
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AVS_VideoFrame *frame;
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unsigned char *dst_p;
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const unsigned char *src_p;
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int n, i, plane, rowsize, planeheight, pitch, bits;
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const char *error;
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if (avs->curr_frame >= avs->vi->num_frames)
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return AVERROR_EOF;
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/* This must happen even if the stream is discarded to prevent desync. */
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n = avs->curr_frame++;
|
|
if (discard)
|
|
return 0;
|
|
|
|
#ifdef USING_AVISYNTH
|
|
/* Define the bpp values for the new AviSynth 2.6 colorspaces.
|
|
* Since AvxSynth doesn't have these functions, special-case
|
|
* it in order to avoid implicit declaration errors. */
|
|
|
|
if (avs_library.avs_is_yv24(avs->vi))
|
|
bits = 24;
|
|
else if (avs_library.avs_is_yv16(avs->vi))
|
|
bits = 16;
|
|
else if (avs_library.avs_is_yv411(avs->vi))
|
|
bits = 12;
|
|
else if (avs_library.avs_is_y8(avs->vi))
|
|
bits = 8;
|
|
else
|
|
bits = avs_library.avs_bits_per_pixel(avs->vi);
|
|
#else
|
|
bits = avs_bits_per_pixel(avs->vi);
|
|
#endif
|
|
|
|
/* Without the cast to int64_t, calculation overflows at about 9k x 9k
|
|
* resolution. */
|
|
pkt->size = (((int64_t)avs->vi->width *
|
|
(int64_t)avs->vi->height) * bits) / 8;
|
|
if (!pkt->size)
|
|
return AVERROR_UNKNOWN;
|
|
|
|
if (av_new_packet(pkt, pkt->size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
|
|
pkt->pts = n;
|
|
pkt->dts = n;
|
|
pkt->duration = 1;
|
|
pkt->stream_index = avs->curr_stream;
|
|
|
|
frame = avs_library.avs_get_frame(avs->clip, n);
|
|
error = avs_library.avs_clip_get_error(avs->clip);
|
|
if (error) {
|
|
av_log(s, AV_LOG_ERROR, "%s\n", error);
|
|
avs->error = 1;
|
|
av_packet_unref(pkt);
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
|
|
dst_p = pkt->data;
|
|
for (i = 0; i < avs->n_planes; i++) {
|
|
plane = avs->planes[i];
|
|
#ifdef USING_AVISYNTH
|
|
src_p = avs_library.avs_get_read_ptr_p(frame, plane);
|
|
pitch = avs_library.avs_get_pitch_p(frame, plane);
|
|
|
|
rowsize = avs_library.avs_get_row_size_p(frame, plane);
|
|
planeheight = avs_library.avs_get_height_p(frame, plane);
|
|
#else
|
|
src_p = avs_get_read_ptr_p(frame, plane);
|
|
pitch = avs_get_pitch_p(frame, plane);
|
|
|
|
rowsize = avs_get_row_size_p(frame, plane);
|
|
planeheight = avs_get_height_p(frame, plane);
|
|
#endif
|
|
|
|
/* Flip RGB video. */
|
|
if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) {
|
|
src_p = src_p + (planeheight - 1) * pitch;
|
|
pitch = -pitch;
|
|
}
|
|
|
|
avs_library.avs_bit_blt(avs->env, dst_p, rowsize, src_p, pitch,
|
|
rowsize, planeheight);
|
|
dst_p += rowsize * planeheight;
|
|
}
|
|
|
|
avs_library.avs_release_video_frame(frame);
|
|
return 0;
|
|
}
|
|
|
|
static int avisynth_read_packet_audio(AVFormatContext *s, AVPacket *pkt,
|
|
int discard)
|
|
{
|
|
AviSynthContext *avs = s->priv_data;
|
|
AVRational fps, samplerate;
|
|
int samples;
|
|
int64_t n;
|
|
const char *error;
|
|
|
|
if (avs->curr_sample >= avs->vi->num_audio_samples)
|
|
return AVERROR_EOF;
|
|
|
|
fps.num = avs->vi->fps_numerator;
|
|
fps.den = avs->vi->fps_denominator;
|
|
samplerate.num = avs->vi->audio_samples_per_second;
|
|
samplerate.den = 1;
|
|
|
|
if (avs_has_video(avs->vi)) {
|
|
if (avs->curr_frame < avs->vi->num_frames)
|
|
samples = av_rescale_q(avs->curr_frame, samplerate, fps) -
|
|
avs->curr_sample;
|
|
else
|
|
samples = av_rescale_q(1, samplerate, fps);
|
|
} else {
|
|
samples = 1000;
|
|
}
|
|
|
|
/* After seeking, audio may catch up with video. */
|
|
if (samples <= 0) {
|
|
pkt->size = 0;
|
|
pkt->data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (avs->curr_sample + samples > avs->vi->num_audio_samples)
|
|
samples = avs->vi->num_audio_samples - avs->curr_sample;
|
|
|
|
/* This must happen even if the stream is discarded to prevent desync. */
|
|
n = avs->curr_sample;
|
|
avs->curr_sample += samples;
|
|
if (discard)
|
|
return 0;
|
|
|
|
pkt->size = avs_bytes_per_channel_sample(avs->vi) *
|
|
samples * avs->vi->nchannels;
|
|
if (!pkt->size)
|
|
return AVERROR_UNKNOWN;
|
|
|
|
if (av_new_packet(pkt, pkt->size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
|
|
pkt->pts = n;
|
|
pkt->dts = n;
|
|
pkt->duration = samples;
|
|
pkt->stream_index = avs->curr_stream;
|
|
|
|
avs_library.avs_get_audio(avs->clip, pkt->data, n, samples);
|
|
error = avs_library.avs_clip_get_error(avs->clip);
|
|
if (error) {
|
|
av_log(s, AV_LOG_ERROR, "%s\n", error);
|
|
avs->error = 1;
|
|
av_packet_unref(pkt);
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int avisynth_read_header(AVFormatContext *s)
|
|
{
|
|
int ret;
|
|
|
|
// Calling library must implement a lock for thread-safe opens.
|
|
if (ret = avpriv_lock_avformat())
|
|
return ret;
|
|
|
|
if (ret = avisynth_open_file(s)) {
|
|
avpriv_unlock_avformat();
|
|
return ret;
|
|
}
|
|
|
|
avpriv_unlock_avformat();
|
|
return 0;
|
|
}
|
|
|
|
static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AviSynthContext *avs = s->priv_data;
|
|
AVStream *st;
|
|
int discard = 0;
|
|
int ret;
|
|
|
|
if (avs->error)
|
|
return AVERROR_UNKNOWN;
|
|
|
|
/* If either stream reaches EOF, try to read the other one before
|
|
* giving up. */
|
|
avisynth_next_stream(s, &st, pkt, &discard);
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
ret = avisynth_read_packet_video(s, pkt, discard);
|
|
if (ret == AVERROR_EOF && avs_has_audio(avs->vi)) {
|
|
avisynth_next_stream(s, &st, pkt, &discard);
|
|
return avisynth_read_packet_audio(s, pkt, discard);
|
|
}
|
|
} else {
|
|
ret = avisynth_read_packet_audio(s, pkt, discard);
|
|
if (ret == AVERROR_EOF && avs_has_video(avs->vi)) {
|
|
avisynth_next_stream(s, &st, pkt, &discard);
|
|
return avisynth_read_packet_video(s, pkt, discard);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static av_cold int avisynth_read_close(AVFormatContext *s)
|
|
{
|
|
if (avpriv_lock_avformat())
|
|
return AVERROR_UNKNOWN;
|
|
|
|
avisynth_context_destroy(s->priv_data);
|
|
avpriv_unlock_avformat();
|
|
return 0;
|
|
}
|
|
|
|
static int avisynth_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
AviSynthContext *avs = s->priv_data;
|
|
AVStream *st;
|
|
AVRational fps, samplerate;
|
|
|
|
if (avs->error)
|
|
return AVERROR_UNKNOWN;
|
|
|
|
fps = (AVRational) { avs->vi->fps_numerator,
|
|
avs->vi->fps_denominator };
|
|
samplerate = (AVRational) { avs->vi->audio_samples_per_second, 1 };
|
|
|
|
st = s->streams[stream_index];
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
/* AviSynth frame counts are signed int. */
|
|
if ((timestamp >= avs->vi->num_frames) ||
|
|
(timestamp > INT_MAX) ||
|
|
(timestamp < 0))
|
|
return AVERROR_EOF;
|
|
avs->curr_frame = timestamp;
|
|
if (avs_has_audio(avs->vi))
|
|
avs->curr_sample = av_rescale_q(timestamp, samplerate, fps);
|
|
} else {
|
|
if ((timestamp >= avs->vi->num_audio_samples) || (timestamp < 0))
|
|
return AVERROR_EOF;
|
|
/* Force frame granularity for seeking. */
|
|
if (avs_has_video(avs->vi)) {
|
|
avs->curr_frame = av_rescale_q(timestamp, fps, samplerate);
|
|
avs->curr_sample = av_rescale_q(avs->curr_frame, samplerate, fps);
|
|
} else {
|
|
avs->curr_sample = timestamp;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_avisynth_demuxer = {
|
|
.name = "avisynth",
|
|
.long_name = NULL_IF_CONFIG_SMALL("AviSynth script"),
|
|
.priv_data_size = sizeof(AviSynthContext),
|
|
.read_header = avisynth_read_header,
|
|
.read_packet = avisynth_read_packet,
|
|
.read_close = avisynth_read_close,
|
|
.read_seek = avisynth_read_seek,
|
|
.extensions = "avs",
|
|
};
|