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feat(libplacebo): auto-detect the buffer filter's supported options

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Signed-off-by: k4yt3x <i@k4yt3x.com>
This commit is contained in:
k4yt3x 2024-10-31 00:00:00 +00:00
parent c912bfaffc
commit a8b952c3ad
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2 changed files with 46 additions and 39 deletions
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5
src/encoder.cpp
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@ -100,9 +100,8 @@ int init_encoder(
}
// Set the CRF and preset for any codecs that support it
char crf_str[16];
snprintf(crf_str, sizeof(crf_str), "%.f", static_cast<double>(encoder_config->crf));
av_opt_set(codec_ctx->priv_data, "crf", crf_str, 0);
std::string crf_str = std::to_string(encoder_config->crf);
av_opt_set(codec_ctx->priv_data, "crf", crf_str.c_str(), 0);
av_opt_set(codec_ctx->priv_data, "preset", encoder_config->preset, 0);
if (fmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) {

80
src/libplacebo.cpp
View File

@ -3,6 +3,10 @@
#include <stdio.h>
#include <stdlib.h>
extern "C" {
#include <libavutil/opt.h>
}
#include <spdlog/spdlog.h>
#include "fsutils.h"
@ -17,7 +21,6 @@ int init_libplacebo(
int out_height,
const std::filesystem::path &shader_path
) {
char args[512];
int ret;
AVFilterGraph *graph = avfilter_graph_alloc();
@ -28,25 +31,43 @@ int init_libplacebo(
// Create buffer source
const AVFilter *buffersrc = avfilter_get_by_name("buffer");
snprintf(
args,
sizeof(args),
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:frame_rate=%d/%d:"
"pixel_aspect=%d/%d:colorspace=%d:range=%d",
dec_ctx->width,
dec_ctx->height,
dec_ctx->pix_fmt,
dec_ctx->time_base.num,
dec_ctx->time_base.den,
dec_ctx->framerate.num,
dec_ctx->framerate.den,
dec_ctx->sample_aspect_ratio.num,
dec_ctx->sample_aspect_ratio.den,
dec_ctx->colorspace,
dec_ctx->color_range
);
if (!buffersrc) {
spdlog::error("Filter 'buffer' not found.");
avfilter_graph_free(&graph);
return AVERROR_FILTER_NOT_FOUND;
}
ret = avfilter_graph_create_filter(buffersrc_ctx, buffersrc, "in", args, NULL, graph);
// Start building the arguments string
std::string args = "video_size=" + std::to_string(dec_ctx->width) + "x" +
std::to_string(dec_ctx->height) +
":pix_fmt=" + std::to_string(dec_ctx->pix_fmt) +
":time_base=" + std::to_string(dec_ctx->time_base.num) + "/" +
std::to_string(dec_ctx->time_base.den) +
":frame_rate=" + std::to_string(dec_ctx->framerate.num) + "/" +
std::to_string(dec_ctx->framerate.den) +
":pixel_aspect=" + std::to_string(dec_ctx->sample_aspect_ratio.num) + "/" +
std::to_string(dec_ctx->sample_aspect_ratio.den);
// Make a copy of the AVClass on the stack
AVClass priv_class_copy = *buffersrc->priv_class;
AVClass *priv_class_copy_ptr = &priv_class_copy;
// Check if the colorspace option is supported
if (av_opt_find(&priv_class_copy_ptr, "colorspace", NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
args += ":colorspace=" + std::to_string(dec_ctx->colorspace);
} else {
spdlog::warn("Option 'colorspace' is not supported by the buffer filter.");
}
// Check if the range option is supported
if (av_opt_find(&priv_class_copy_ptr, "range", NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
args += ":range=" + std::to_string(dec_ctx->color_range);
} else {
spdlog::warn("Option 'range' is not supported by the buffer filter.");
}
spdlog::debug("Buffer source args: {}", args);
ret = avfilter_graph_create_filter(buffersrc_ctx, buffersrc, "in", args.c_str(), NULL, graph);
if (ret < 0) {
spdlog::error("Cannot create buffer source.");
avfilter_graph_free(&graph);
@ -72,26 +93,13 @@ int init_libplacebo(
#endif
// Prepare the filter arguments
char filter_args[4096];
int filter_args_size = snprintf(
filter_args,
sizeof(filter_args),
"w=%d:h=%d:custom_shader_path='%s'",
out_width,
out_height,
shader_path_string.c_str()
);
// Check if the filter arguments are too long
if (filter_args_size < 0 || filter_args_size >= static_cast<int>(sizeof(filter_args))) {
spdlog::error("libplacebo filter arguments too long.");
avfilter_graph_free(&graph);
return AVERROR(EINVAL);
}
std::string filter_args = "w=" + std::to_string(out_width) +
":h=" + std::to_string(out_height) + ":custom_shader_path='" +
shader_path_string + "'";
AVFilterContext *libplacebo_ctx;
ret = avfilter_graph_create_filter(
&libplacebo_ctx, libplacebo_filter, "libplacebo", filter_args, NULL, graph
&libplacebo_ctx, libplacebo_filter, "libplacebo", filter_args.c_str(), NULL, graph
);
if (ret < 0) {
spdlog::error("Cannot create libplacebo filter.");