pineapple/externals/ffmpeg/libavformat/vapoursynth.c

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2021-02-09 04:25:58 +01:00
/*
* 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
*/
/**
* @file
* VapourSynth demuxer
*
* Synthesizes vapour (?)
*/
#include <limits.h>
#include <VapourSynth.h>
#include <VSScript.h>
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/eval.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avformat.h"
#include "internal.h"
struct VSState {
VSScript *vss;
};
typedef struct VSContext {
const AVClass *class;
AVBufferRef *vss_state;
const VSAPI *vsapi;
VSCore *vscore;
VSNodeRef *outnode;
int is_cfr;
int current_frame;
int c_order[4];
/* options */
int64_t max_script_size;
} VSContext;
#define OFFSET(x) offsetof(VSContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define D AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{"max_script_size", "set max file size supported (in bytes)", OFFSET(max_script_size), AV_OPT_TYPE_INT64, {.i64 = 1 * 1024 * 1024}, 0, SIZE_MAX - 1, A|D},
{NULL}
};
static void free_vss_state(void *opaque, uint8_t *data)
{
struct VSState *vss = opaque;
if (vss->vss) {
vsscript_freeScript(vss->vss);
vsscript_finalize();
}
}
static av_cold int read_close_vs(AVFormatContext *s)
{
VSContext *vs = s->priv_data;
if (vs->outnode)
vs->vsapi->freeNode(vs->outnode);
av_buffer_unref(&vs->vss_state);
vs->vsapi = NULL;
vs->vscore = NULL;
vs->outnode = NULL;
return 0;
}
static av_cold int is_native_endian(enum AVPixelFormat pixfmt)
{
enum AVPixelFormat other = av_pix_fmt_swap_endianness(pixfmt);
const AVPixFmtDescriptor *pd;
if (other == AV_PIX_FMT_NONE || other == pixfmt)
return 1; // not affected by byte order
pd = av_pix_fmt_desc_get(pixfmt);
return pd && (!!HAVE_BIGENDIAN == !!(pd->flags & AV_PIX_FMT_FLAG_BE));
}
static av_cold enum AVPixelFormat match_pixfmt(const VSFormat *vsf, int c_order[4])
{
static const int yuv_order[4] = {0, 1, 2, 0};
static const int rgb_order[4] = {1, 2, 0, 0};
const AVPixFmtDescriptor *pd;
for (pd = av_pix_fmt_desc_next(NULL); pd; pd = av_pix_fmt_desc_next(pd)) {
int is_rgb, is_yuv, i;
const int *order;
enum AVPixelFormat pixfmt;
pixfmt = av_pix_fmt_desc_get_id(pd);
if (pd->flags & (AV_PIX_FMT_FLAG_BAYER | AV_PIX_FMT_FLAG_ALPHA |
AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM))
continue;
if (pd->log2_chroma_w != vsf->subSamplingW ||
pd->log2_chroma_h != vsf->subSamplingH)
continue;
is_rgb = vsf->colorFamily == cmRGB;
if (is_rgb != !!(pd->flags & AV_PIX_FMT_FLAG_RGB))
continue;
is_yuv = vsf->colorFamily == cmYUV ||
vsf->colorFamily == cmYCoCg ||
vsf->colorFamily == cmGray;
if (!is_rgb && !is_yuv)
continue;
if (vsf->sampleType != ((pd->flags & AV_PIX_FMT_FLAG_FLOAT) ? stFloat : stInteger))
continue;
if (av_pix_fmt_count_planes(pixfmt) != vsf->numPlanes)
continue;
if (strncmp(pd->name, "xyz", 3) == 0)
continue;
if (!is_native_endian(pixfmt))
continue;
order = is_yuv ? yuv_order : rgb_order;
for (i = 0; i < pd->nb_components; i++) {
const AVComponentDescriptor *c = &pd->comp[i];
if (order[c->plane] != i ||
c->offset != 0 || c->shift != 0 ||
c->step != vsf->bytesPerSample ||
c->depth != vsf->bitsPerSample)
goto cont;
}
// Use it.
memcpy(c_order, order, sizeof(int[4]));
return pixfmt;
cont: ;
}
return AV_PIX_FMT_NONE;
}
static av_cold int read_header_vs(AVFormatContext *s)
{
AVStream *st;
AVIOContext *pb = s->pb;
VSContext *vs = s->priv_data;
int64_t sz = avio_size(pb);
char *buf = NULL;
char dummy;
const VSVideoInfo *info;
struct VSState *vss_state;
int err = 0;
vss_state = av_mallocz(sizeof(*vss_state));
if (!vss_state) {
err = AVERROR(ENOMEM);
goto done;
}
vs->vss_state = av_buffer_create(NULL, 0, free_vss_state, vss_state, 0);
if (!vs->vss_state) {
err = AVERROR(ENOMEM);
av_free(vss_state);
goto done;
}
if (!vsscript_init()) {
av_log(s, AV_LOG_ERROR, "Failed to initialize VSScript (possibly PYTHONPATH not set).\n");
err = AVERROR_EXTERNAL;
goto done;
}
if (vsscript_createScript(&vss_state->vss)) {
av_log(s, AV_LOG_ERROR, "Failed to create script instance.\n");
err = AVERROR_EXTERNAL;
vsscript_finalize();
goto done;
}
if (sz < 0 || sz > vs->max_script_size) {
if (sz < 0)
av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
sz = vs->max_script_size;
}
buf = av_malloc(sz + 1);
if (!buf) {
err = AVERROR(ENOMEM);
goto done;
}
sz = avio_read(pb, buf, sz);
if (sz < 0) {
av_log(s, AV_LOG_ERROR, "Could not read script.\n");
err = sz;
goto done;
}
// Data left means our buffer (the max_script_size option) is too small
if (avio_read(pb, &dummy, 1) == 1) {
av_log(s, AV_LOG_ERROR, "File size is larger than max_script_size option "
"value %"PRIi64", consider increasing the max_script_size option\n",
vs->max_script_size);
err = AVERROR_BUFFER_TOO_SMALL;
goto done;
}
buf[sz] = '\0';
if (vsscript_evaluateScript(&vss_state->vss, buf, s->url, 0)) {
const char *msg = vsscript_getError(vss_state->vss);
av_log(s, AV_LOG_ERROR, "Failed to parse script: %s\n", msg ? msg : "(unknown)");
err = AVERROR_EXTERNAL;
goto done;
}
vs->vsapi = vsscript_getVSApi();
vs->vscore = vsscript_getCore(vss_state->vss);
vs->outnode = vsscript_getOutput(vss_state->vss, 0);
if (!vs->outnode) {
av_log(s, AV_LOG_ERROR, "Could not get script output node.\n");
err = AVERROR_EXTERNAL;
goto done;
}
st = avformat_new_stream(s, NULL);
if (!st) {
err = AVERROR(ENOMEM);
goto done;
}
info = vs->vsapi->getVideoInfo(vs->outnode);
if (!info->format || !info->width || !info->height) {
av_log(s, AV_LOG_ERROR, "Non-constant input format not supported.\n");
err = AVERROR_PATCHWELCOME;
goto done;
}
if (info->fpsDen) {
vs->is_cfr = 1;
avpriv_set_pts_info(st, 64, info->fpsDen, info->fpsNum);
st->duration = info->numFrames;
} else {
// VFR. Just set "something".
avpriv_set_pts_info(st, 64, 1, AV_TIME_BASE);
s->ctx_flags |= AVFMTCTX_UNSEEKABLE;
}
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_WRAPPED_AVFRAME;
st->codecpar->width = info->width;
st->codecpar->height = info->height;
st->codecpar->format = match_pixfmt(info->format, vs->c_order);
if (st->codecpar->format == AV_PIX_FMT_NONE) {
av_log(s, AV_LOG_ERROR, "Unsupported VS pixel format %s\n", info->format->name);
err = AVERROR_EXTERNAL;
goto done;
}
av_log(s, AV_LOG_VERBOSE, "VS format %s -> pixfmt %s\n", info->format->name,
av_get_pix_fmt_name(st->codecpar->format));
if (info->format->colorFamily == cmYCoCg)
st->codecpar->color_space = AVCOL_SPC_YCGCO;
done:
av_free(buf);
if (err < 0)
read_close_vs(s);
return err;
}
static void free_frame(void *opaque, uint8_t *data)
{
AVFrame *frame = (AVFrame *)data;
av_frame_free(&frame);
}
static int get_vs_prop_int(AVFormatContext *s, const VSMap *map, const char *name, int def)
{
VSContext *vs = s->priv_data;
int64_t res;
int err = 1;
res = vs->vsapi->propGetInt(map, name, 0, &err);
return err || res < INT_MIN || res > INT_MAX ? def : res;
}
struct vsframe_ref_data {
const VSAPI *vsapi;
const VSFrameRef *frame;
AVBufferRef *vss_state;
};
static void free_vsframe_ref(void *opaque, uint8_t *data)
{
struct vsframe_ref_data *d = opaque;
if (d->frame)
d->vsapi->freeFrame(d->frame);
av_buffer_unref(&d->vss_state);
av_free(d);
}
static int read_packet_vs(AVFormatContext *s, AVPacket *pkt)
{
VSContext *vs = s->priv_data;
AVStream *st = s->streams[0];
AVFrame *frame = NULL;
char vserr[80];
const VSFrameRef *vsframe;
const VSVideoInfo *info = vs->vsapi->getVideoInfo(vs->outnode);
const VSMap *props;
const AVPixFmtDescriptor *desc;
AVBufferRef *vsframe_ref = NULL;
struct vsframe_ref_data *ref_data;
int err = 0;
int i;
if (vs->current_frame >= info->numFrames)
return AVERROR_EOF;
ref_data = av_mallocz(sizeof(*ref_data));
if (!ref_data) {
err = AVERROR(ENOMEM);
goto end;
}
// (the READONLY flag is important because the ref is reused for plane data)
vsframe_ref = av_buffer_create(NULL, 0, free_vsframe_ref, ref_data, AV_BUFFER_FLAG_READONLY);
if (!vsframe_ref) {
err = AVERROR(ENOMEM);
av_free(ref_data);
goto end;
}
vsframe = vs->vsapi->getFrame(vs->current_frame, vs->outnode, vserr, sizeof(vserr));
if (!vsframe) {
av_log(s, AV_LOG_ERROR, "Error getting frame: %s\n", vserr);
err = AVERROR_EXTERNAL;
goto end;
}
ref_data->vsapi = vs->vsapi;
ref_data->frame = vsframe;
ref_data->vss_state = av_buffer_ref(vs->vss_state);
if (!ref_data->vss_state) {
err = AVERROR(ENOMEM);
goto end;
}
props = vs->vsapi->getFramePropsRO(vsframe);
frame = av_frame_alloc();
if (!frame) {
err = AVERROR(ENOMEM);
goto end;
}
frame->format = st->codecpar->format;
frame->width = st->codecpar->width;
frame->height = st->codecpar->height;
frame->colorspace = st->codecpar->color_space;
// Values according to ISO/IEC 14496-10.
frame->colorspace = get_vs_prop_int(s, props, "_Matrix", frame->colorspace);
frame->color_primaries = get_vs_prop_int(s, props, "_Primaries", frame->color_primaries);
frame->color_trc = get_vs_prop_int(s, props, "_Transfer", frame->color_trc);
if (get_vs_prop_int(s, props, "_ColorRange", 1) == 0)
frame->color_range = AVCOL_RANGE_JPEG;
frame->sample_aspect_ratio.num = get_vs_prop_int(s, props, "_SARNum", 0);
frame->sample_aspect_ratio.den = get_vs_prop_int(s, props, "_SARDen", 1);
av_assert0(vs->vsapi->getFrameWidth(vsframe, 0) == frame->width);
av_assert0(vs->vsapi->getFrameHeight(vsframe, 0) == frame->height);
desc = av_pix_fmt_desc_get(frame->format);
for (i = 0; i < info->format->numPlanes; i++) {
int p = vs->c_order[i];
ptrdiff_t plane_h = frame->height;
frame->data[i] = (void *)vs->vsapi->getReadPtr(vsframe, p);
frame->linesize[i] = vs->vsapi->getStride(vsframe, p);
frame->buf[i] = av_buffer_ref(vsframe_ref);
if (!frame->buf[i]) {
err = AVERROR(ENOMEM);
goto end;
}
// Each plane needs an AVBufferRef that indicates the correct plane
// memory range. VapourSynth doesn't even give us the memory range,
// so make up a bad guess to make FFmpeg happy (even if almost nothing
// checks the memory range).
if (i == 1 || i == 2)
plane_h = AV_CEIL_RSHIFT(plane_h, desc->log2_chroma_h);
frame->buf[i]->data = frame->data[i];
frame->buf[i]->size = frame->linesize[i] * plane_h;
}
pkt->buf = av_buffer_create((uint8_t*)frame, sizeof(*frame),
free_frame, NULL, 0);
if (!pkt->buf) {
err = AVERROR(ENOMEM);
goto end;
}
frame = NULL; // pkt owns it now
pkt->data = pkt->buf->data;
pkt->size = pkt->buf->size;
pkt->flags |= AV_PKT_FLAG_TRUSTED;
if (vs->is_cfr)
pkt->pts = vs->current_frame;
vs->current_frame++;
end:
av_frame_free(&frame);
av_buffer_unref(&vsframe_ref);
return err;
}
static int read_seek_vs(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
{
VSContext *vs = s->priv_data;
if (!vs->is_cfr)
return AVERROR(ENOSYS);
vs->current_frame = FFMIN(FFMAX(0, ts), s->streams[0]->duration);
return 0;
}
static av_cold int probe_vs(const AVProbeData *p)
{
// Explicitly do not support this. VS scripts are written in Python, and
// can run arbitrary code on the user's system.
return 0;
}
static const AVClass class_vs = {
.class_name = "VapourSynth demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_vapoursynth_demuxer = {
.name = "vapoursynth",
.long_name = NULL_IF_CONFIG_SMALL("VapourSynth demuxer"),
.priv_data_size = sizeof(VSContext),
.read_probe = probe_vs,
.read_header = read_header_vs,
.read_packet = read_packet_vs,
.read_close = read_close_vs,
.read_seek = read_seek_vs,
.priv_class = &class_vs,
};