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FFmpeg/libavformat/avisynth.c
wm4 86a13bf2ff lavc, lavf: move avformat static mutex from avcodec to avformat 
It's completely absurd that libavcodec would care about libavformat
locking, but it was there because the lock manager was in libavcodec.

This is more stright forward. Changes ABI, but we don't require ABI
compatibility currently.
2017-12-26 02:50:00 +01:00

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/*
* AviSynth/AvxSynth support
* Copyright (c) 2012 AvxSynth Team
*
* This file is part of FFmpeg
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "libavutil/internal.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "internal.h"
#include "config.h"
/* Enable function pointer definitions for runtime loading. */
#define AVSC_NO_DECLSPEC
/* Platform-specific directives for AviSynth vs AvxSynth. */
#ifdef _WIN32
#include "compat/w32dlfcn.h"
#undef EXTERN_C
#include "compat/avisynth/avisynth_c.h"
#define AVISYNTH_LIB "avisynth"
#define USING_AVISYNTH
#else
#include <dlfcn.h>
#include "compat/avisynth/avxsynth_c.h"
#define AVISYNTH_NAME "libavxsynth"
#define AVISYNTH_LIB AVISYNTH_NAME SLIBSUF
#endif
typedef struct AviSynthLibrary {
void *library;
#define AVSC_DECLARE_FUNC(name) name ## _func name
AVSC_DECLARE_FUNC(avs_bit_blt);
AVSC_DECLARE_FUNC(avs_clip_get_error);
AVSC_DECLARE_FUNC(avs_create_script_environment);
AVSC_DECLARE_FUNC(avs_delete_script_environment);
AVSC_DECLARE_FUNC(avs_get_audio);
AVSC_DECLARE_FUNC(avs_get_error);
AVSC_DECLARE_FUNC(avs_get_frame);
AVSC_DECLARE_FUNC(avs_get_version);
AVSC_DECLARE_FUNC(avs_get_video_info);
AVSC_DECLARE_FUNC(avs_invoke);
AVSC_DECLARE_FUNC(avs_release_clip);
AVSC_DECLARE_FUNC(avs_release_value);
AVSC_DECLARE_FUNC(avs_release_video_frame);
AVSC_DECLARE_FUNC(avs_take_clip);
#ifdef USING_AVISYNTH
AVSC_DECLARE_FUNC(avs_bits_per_pixel);
AVSC_DECLARE_FUNC(avs_get_height_p);
AVSC_DECLARE_FUNC(avs_get_pitch_p);
AVSC_DECLARE_FUNC(avs_get_read_ptr_p);
AVSC_DECLARE_FUNC(avs_get_row_size_p);
AVSC_DECLARE_FUNC(avs_is_planar_rgb);
AVSC_DECLARE_FUNC(avs_is_planar_rgba);
#endif
#undef AVSC_DECLARE_FUNC
} AviSynthLibrary;
typedef struct AviSynthContext {
AVS_ScriptEnvironment *env;
AVS_Clip *clip;
const AVS_VideoInfo *vi;
/* avisynth_read_packet_video() iterates over this. */
int n_planes;
const int *planes;
int curr_stream;
int curr_frame;
int64_t curr_sample;
int error;
/* Linked list pointers. */
struct AviSynthContext *next;
} AviSynthContext;
static const int avs_planes_packed[1] = { 0 };
static const int avs_planes_grey[1] = { AVS_PLANAR_Y };
static const int avs_planes_yuv[3] = { AVS_PLANAR_Y, AVS_PLANAR_U,
AVS_PLANAR_V };
#ifdef USING_AVISYNTH
static const int avs_planes_rgb[3] = { AVS_PLANAR_G, AVS_PLANAR_B,
AVS_PLANAR_R };
static const int avs_planes_yuva[4] = { AVS_PLANAR_Y, AVS_PLANAR_U,
AVS_PLANAR_V, AVS_PLANAR_A };
static const int avs_planes_rgba[4] = { AVS_PLANAR_G, AVS_PLANAR_B,
AVS_PLANAR_R, AVS_PLANAR_A };
#endif
/* A conflict between C++ global objects, atexit, and dynamic loading requires
* us to register our own atexit handler to prevent double freeing. */
static AviSynthLibrary avs_library;
static int avs_atexit_called = 0;
/* Linked list of AviSynthContexts. An atexit handler destroys this list. */
static AviSynthContext *avs_ctx_list = NULL;
static av_cold void avisynth_atexit_handler(void);
static av_cold int avisynth_load_library(void)
{
avs_library.library = dlopen(AVISYNTH_LIB, RTLD_NOW | RTLD_LOCAL);
if (!avs_library.library)
return AVERROR_UNKNOWN;
#define LOAD_AVS_FUNC(name, continue_on_fail) \
avs_library.name = dlsym(avs_library.library, #name); \
if (!continue_on_fail && !avs_library.name) \
goto fail;
LOAD_AVS_FUNC(avs_bit_blt, 0);
LOAD_AVS_FUNC(avs_clip_get_error, 0);
LOAD_AVS_FUNC(avs_create_script_environment, 0);
LOAD_AVS_FUNC(avs_delete_script_environment, 0);
LOAD_AVS_FUNC(avs_get_audio, 0);
LOAD_AVS_FUNC(avs_get_error, 1); // New to AviSynth 2.6
LOAD_AVS_FUNC(avs_get_frame, 0);
LOAD_AVS_FUNC(avs_get_version, 0);
LOAD_AVS_FUNC(avs_get_video_info, 0);
LOAD_AVS_FUNC(avs_invoke, 0);
LOAD_AVS_FUNC(avs_release_clip, 0);
LOAD_AVS_FUNC(avs_release_value, 0);
LOAD_AVS_FUNC(avs_release_video_frame, 0);
LOAD_AVS_FUNC(avs_take_clip, 0);
#ifdef USING_AVISYNTH
LOAD_AVS_FUNC(avs_bits_per_pixel, 1);
LOAD_AVS_FUNC(avs_get_height_p, 1);
LOAD_AVS_FUNC(avs_get_pitch_p, 1);
LOAD_AVS_FUNC(avs_get_read_ptr_p, 1);
LOAD_AVS_FUNC(avs_get_row_size_p, 1);
LOAD_AVS_FUNC(avs_is_planar_rgb, 1);
LOAD_AVS_FUNC(avs_is_planar_rgba, 1);
#endif
#undef LOAD_AVS_FUNC
atexit(avisynth_atexit_handler);
return 0;
fail:
dlclose(avs_library.library);
return AVERROR_UNKNOWN;
}
/* Note that avisynth_context_create and avisynth_context_destroy
* do not allocate or free the actual context! That is taken care of
* by libavformat. */
static av_cold int avisynth_context_create(AVFormatContext *s)
{
AviSynthContext *avs = s->priv_data;
int ret;
if (!avs_library.library)
if (ret = avisynth_load_library())
return ret;
avs->env = avs_library.avs_create_script_environment(3);
if (avs_library.avs_get_error) {
const char *error = avs_library.avs_get_error(avs->env);
if (error) {
av_log(s, AV_LOG_ERROR, "%s\n", error);
return AVERROR_UNKNOWN;
}
}
if (!avs_ctx_list) {
avs_ctx_list = avs;
} else {
avs->next = avs_ctx_list;
avs_ctx_list = avs;
}
return 0;
}
static av_cold void avisynth_context_destroy(AviSynthContext *avs)
{
if (avs_atexit_called)
return;
if (avs == avs_ctx_list) {
avs_ctx_list = avs->next;
} else {
AviSynthContext *prev = avs_ctx_list;
while (prev->next != avs)
prev = prev->next;
prev->next = avs->next;
}
if (avs->clip) {
avs_library.avs_release_clip(avs->clip);
avs->clip = NULL;
}
if (avs->env) {
avs_library.avs_delete_script_environment(avs->env);
avs->env = NULL;
}
}
static av_cold void avisynth_atexit_handler(void)
{
AviSynthContext *avs = avs_ctx_list;
while (avs) {
AviSynthContext *next = avs->next;
avisynth_context_destroy(avs);
avs = next;
}
dlclose(avs_library.library);
avs_atexit_called = 1;
}
/* Create AVStream from audio and video data. */
static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
{
AviSynthContext *avs = s->priv_data;
int planar = 0; // 0: packed, 1: YUV, 2: Y8, 3: Planar RGB, 4: YUVA, 5: Planar RGBA
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
st->codecpar->width = avs->vi->width;
st->codecpar->height = avs->vi->height;
st->avg_frame_rate = (AVRational) { avs->vi->fps_numerator,
avs->vi->fps_denominator };
st->start_time = 0;
st->duration = avs->vi->num_frames;
st->nb_frames = avs->vi->num_frames;
avpriv_set_pts_info(st, 32, avs->vi->fps_denominator, avs->vi->fps_numerator);
switch (avs->vi->pixel_type) {
#ifdef USING_AVISYNTH
/* 10~16-bit YUV pix_fmts (AviSynth+) */
case AVS_CS_YUV444P10:
st->codecpar->format = AV_PIX_FMT_YUV444P10;
planar = 1;
break;
case AVS_CS_YUV422P10:
st->codecpar->format = AV_PIX_FMT_YUV422P10;
planar = 1;
break;
case AVS_CS_YUV420P10:
st->codecpar->format = AV_PIX_FMT_YUV420P10;
planar = 1;
break;
case AVS_CS_YUV444P12:
st->codecpar->format = AV_PIX_FMT_YUV444P12;
planar = 1;
break;
case AVS_CS_YUV422P12:
st->codecpar->format = AV_PIX_FMT_YUV422P12;
planar = 1;
break;
case AVS_CS_YUV420P12:
st->codecpar->format = AV_PIX_FMT_YUV420P12;
planar = 1;
break;
case AVS_CS_YUV444P14:
st->codecpar->format = AV_PIX_FMT_YUV444P14;
planar = 1;
break;
case AVS_CS_YUV422P14:
st->codecpar->format = AV_PIX_FMT_YUV422P14;
planar = 1;
break;
case AVS_CS_YUV420P14:
st->codecpar->format = AV_PIX_FMT_YUV420P14;
planar = 1;
break;
case AVS_CS_YUV444P16:
st->codecpar->format = AV_PIX_FMT_YUV444P16;
planar = 1;
break;
case AVS_CS_YUV422P16:
st->codecpar->format = AV_PIX_FMT_YUV422P16;
planar = 1;
break;
case AVS_CS_YUV420P16:
st->codecpar->format = AV_PIX_FMT_YUV420P16;
planar = 1;
break;
/* 8~16-bit YUV pix_fmts with Alpha (AviSynth+) */
case AVS_CS_YUVA444:
st->codecpar->format = AV_PIX_FMT_YUVA444P;
planar = 4;
break;
case AVS_CS_YUVA422:
st->codecpar->format = AV_PIX_FMT_YUVA422P;
planar = 4;
break;
case AVS_CS_YUVA420:
st->codecpar->format = AV_PIX_FMT_YUVA420P;
planar = 4;
break;
case AVS_CS_YUVA444P10:
st->codecpar->format = AV_PIX_FMT_YUVA444P10;
planar = 4;
break;
case AVS_CS_YUVA422P10:
st->codecpar->format = AV_PIX_FMT_YUVA422P10;
planar = 4;
break;
case AVS_CS_YUVA420P10:
st->codecpar->format = AV_PIX_FMT_YUVA420P10;
planar = 4;
break;
case AVS_CS_YUVA444P16:
st->codecpar->format = AV_PIX_FMT_YUVA444P16;
planar = 4;
break;
case AVS_CS_YUVA422P16:
st->codecpar->format = AV_PIX_FMT_YUVA422P16;
planar = 4;
break;
case AVS_CS_YUVA420P16:
st->codecpar->format = AV_PIX_FMT_YUVA420P16;
planar = 4;
break;
/* Planar RGB pix_fmts (AviSynth+) */
case AVS_CS_RGBP:
st->codecpar->format = AV_PIX_FMT_GBRP;
planar = 3;
break;
case AVS_CS_RGBP10:
st->codecpar->format = AV_PIX_FMT_GBRP10;
planar = 3;
break;
case AVS_CS_RGBP12:
st->codecpar->format = AV_PIX_FMT_GBRP12;
planar = 3;
break;
case AVS_CS_RGBP14:
st->codecpar->format = AV_PIX_FMT_GBRP14;
planar = 3;
break;
case AVS_CS_RGBP16:
st->codecpar->format = AV_PIX_FMT_GBRP16;
planar = 3;
break;
/* Planar RGB pix_fmts with Alpha (AviSynth+) */
case AVS_CS_RGBAP:
st->codecpar->format = AV_PIX_FMT_GBRAP;
planar = 5;
break;
case AVS_CS_RGBAP10:
st->codecpar->format = AV_PIX_FMT_GBRAP10;
planar = 5;
break;
case AVS_CS_RGBAP12:
st->codecpar->format = AV_PIX_FMT_GBRAP12;
planar = 5;
break;
case AVS_CS_RGBAP16:
st->codecpar->format = AV_PIX_FMT_GBRAP16;
planar = 5;
break;
/* GRAY16 (AviSynth+) */
case AVS_CS_Y16:
st->codecpar->format = AV_PIX_FMT_GRAY16;
planar = 2;
break;
/* pix_fmts added in AviSynth 2.6 */
case AVS_CS_YV24:
st->codecpar->format = AV_PIX_FMT_YUV444P;
planar = 1;
break;
case AVS_CS_YV16:
st->codecpar->format = AV_PIX_FMT_YUV422P;
planar = 1;
break;
case AVS_CS_YV411:
st->codecpar->format = AV_PIX_FMT_YUV411P;
planar = 1;
break;
case AVS_CS_Y8:
st->codecpar->format = AV_PIX_FMT_GRAY8;
planar = 2;
break;
/* 16-bit packed RGB pix_fmts (AviSynth+) */
case AVS_CS_BGR48:
st->codecpar->format = AV_PIX_FMT_BGR48;
break;
case AVS_CS_BGR64:
st->codecpar->format = AV_PIX_FMT_BGRA64;
break;
#endif
/* AviSynth 2.5 and AvxSynth pix_fmts */
case AVS_CS_BGR24:
st->codecpar->format = AV_PIX_FMT_BGR24;
break;
case AVS_CS_BGR32:
st->codecpar->format = AV_PIX_FMT_RGB32;
break;
case AVS_CS_YUY2:
st->codecpar->format = AV_PIX_FMT_YUYV422;
break;
case AVS_CS_YV12:
st->codecpar->format = AV_PIX_FMT_YUV420P;
planar = 1;
break;
case AVS_CS_I420: // Is this even used anywhere?
st->codecpar->format = AV_PIX_FMT_YUV420P;
planar = 1;
break;
default:
av_log(s, AV_LOG_ERROR,
"unknown AviSynth colorspace %d\n", avs->vi->pixel_type);
avs->error = 1;
return AVERROR_UNKNOWN;
}
switch (planar) {
#ifdef USING_AVISYNTH
case 5: // Planar RGB + Alpha
avs->n_planes = 4;
avs->planes = avs_planes_rgba;
break;
case 4: // YUV + Alpha
avs->n_planes = 4;
avs->planes = avs_planes_yuva;
break;
case 3: // Planar RGB
avs->n_planes = 3;
avs->planes = avs_planes_rgb;
break;
#endif
case 2: // Y8
avs->n_planes = 1;
avs->planes = avs_planes_grey;
break;
case 1: // YUV
avs->n_planes = 3;
avs->planes = avs_planes_yuv;
break;
default:
avs->n_planes = 1;
avs->planes = avs_planes_packed;
}
return 0;
}
static int avisynth_create_stream_audio(AVFormatContext *s, AVStream *st)
{
AviSynthContext *avs = s->priv_data;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->sample_rate = avs->vi->audio_samples_per_second;
st->codecpar->channels = avs->vi->nchannels;
st->duration = avs->vi->num_audio_samples;
avpriv_set_pts_info(st, 64, 1, avs->vi->audio_samples_per_second);
switch (avs->vi->sample_type) {
case AVS_SAMPLE_INT8:
st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
break;
case AVS_SAMPLE_INT16:
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
break;
case AVS_SAMPLE_INT24:
st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
break;
case AVS_SAMPLE_INT32:
st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
break;
case AVS_SAMPLE_FLOAT:
st->codecpar->codec_id = AV_CODEC_ID_PCM_F32LE;
break;
default:
av_log(s, AV_LOG_ERROR,
"unknown AviSynth sample type %d\n", avs->vi->sample_type);
avs->error = 1;
return AVERROR_UNKNOWN;
}
return 0;
}
static int avisynth_create_stream(AVFormatContext *s)
{
AviSynthContext *avs = s->priv_data;
AVStream *st;
int ret;
int id = 0;
if (avs_has_video(avs->vi)) {
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR_UNKNOWN;
st->id = id++;
if (ret = avisynth_create_stream_video(s, st))
return ret;
}
if (avs_has_audio(avs->vi)) {
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR_UNKNOWN;
st->id = id++;
if (ret = avisynth_create_stream_audio(s, st))
return ret;
}
return 0;
}
static int avisynth_open_file(AVFormatContext *s)
{
AviSynthContext *avs = s->priv_data;
AVS_Value arg, val;
int ret;
#ifdef USING_AVISYNTH
char filename_ansi[MAX_PATH * 4];
wchar_t filename_wc[MAX_PATH * 4];
#endif
if (ret = avisynth_context_create(s))
return ret;
#ifdef USING_AVISYNTH
/* Convert UTF-8 to ANSI code page */
MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wc, MAX_PATH * 4);
WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wc, -1, filename_ansi,
MAX_PATH * 4, NULL, NULL);
arg = avs_new_value_string(filename_ansi);
#else
arg = avs_new_value_string(s->filename);
#endif
val = avs_library.avs_invoke(avs->env, "Import", arg, 0);
if (avs_is_error(val)) {
av_log(s, AV_LOG_ERROR, "%s\n", avs_as_error(val));
ret = AVERROR_UNKNOWN;
goto fail;
}
if (!avs_is_clip(val)) {
av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
ret = AVERROR_UNKNOWN;
goto fail;
}
avs->clip = avs_library.avs_take_clip(val, avs->env);
avs->vi = avs_library.avs_get_video_info(avs->clip);
#ifdef USING_AVISYNTH
/* On Windows, FFmpeg supports AviSynth interface version 6 or higher.
* This includes AviSynth 2.6 RC1 or higher, and AviSynth+ r1718 or higher,
* and excludes 2.5 and the 2.6 alphas. Since AvxSynth identifies itself
* as interface version 3 like 2.5.8, this needs to be special-cased. */
if (avs_library.avs_get_version(avs->clip) < 6) {
av_log(s, AV_LOG_ERROR,
"AviSynth version is too old. Please upgrade to either AviSynth 2.6 >= RC1 or AviSynth+ >= r1718.\n");
ret = AVERROR_UNKNOWN;
goto fail;
}
#endif
/* Release the AVS_Value as it will go out of scope. */
avs_library.avs_release_value(val);
if (ret = avisynth_create_stream(s))
goto fail;
return 0;
fail:
avisynth_context_destroy(avs);
return ret;
}
static void avisynth_next_stream(AVFormatContext *s, AVStream **st,
AVPacket *pkt, int *discard)
{
AviSynthContext *avs = s->priv_data;
avs->curr_stream++;
avs->curr_stream %= s->nb_streams;
*st = s->streams[avs->curr_stream];
if ((*st)->discard == AVDISCARD_ALL)
*discard = 1;
else
*discard = 0;
return;
}
/* Copy AviSynth clip data into an AVPacket. */
static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
int discard)
{
AviSynthContext *avs = s->priv_data;
AVS_VideoFrame *frame;
unsigned char *dst_p;
const unsigned char *src_p;
int n, i, plane, rowsize, planeheight, pitch, bits;
const char *error;
int avsplus av_unused;
if (avs->curr_frame >= avs->vi->num_frames)
return AVERROR_EOF;
/* This must happen even if the stream is discarded to prevent desync. */
n = avs->curr_frame++;
if (discard)
return 0;
#ifdef USING_AVISYNTH
/* Detect whether we're using AviSynth 2.6 or AviSynth+ by
* looking for whether avs_is_planar_rgb exists. */
if (GetProcAddress(avs_library.library, "avs_is_planar_rgb") == NULL)
avsplus = 0;
else
avsplus = 1;
/* avs_bits_per_pixel changed to AVSC_API with AviSynth 2.6, which
* requires going through avs_library, while AvxSynth has it under
* the older AVSC_INLINE type, so special-case this. */
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;
}
#ifdef USING_AVISYNTH
/* Flip Planar RGB video */
if (avsplus && (avs_library.avs_is_planar_rgb(avs->vi) ||
avs_library.avs_is_planar_rgba(avs->vi))) {
src_p = src_p + (planeheight - 1) * pitch;
pitch = -pitch;
}
#endif
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 = ff_lock_avformat())
return ret;
if (ret = avisynth_open_file(s)) {
ff_unlock_avformat();
return ret;
}
ff_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->codecpar->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 (ff_lock_avformat())
return AVERROR_UNKNOWN;
avisynth_context_destroy(s->priv_data);
ff_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->codecpar->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",
};
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