+#include "x264_dynamic.h"
+
+#include <assert.h>
+#include <dlfcn.h>
+#include <link.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <string>
+
+using namespace std;
+
+X264Dynamic load_x264_for_bit_depth(unsigned depth)
+{
+ X264Dynamic dyn;
+ if (unsigned(x264_bit_depth) >= depth) {
+ // Just use the one we are linked to.
+ dyn.handle = nullptr;
+ dyn.x264_encoder_close = x264_encoder_close;
+ dyn.x264_encoder_delayed_frames = x264_encoder_delayed_frames;
+ dyn.x264_encoder_encode = x264_encoder_encode;
+ dyn.x264_encoder_headers = x264_encoder_headers;
+ dyn.x264_encoder_open = x264_encoder_open;
+ dyn.x264_encoder_parameters = x264_encoder_parameters;
+ dyn.x264_encoder_reconfig = x264_encoder_reconfig;
+ dyn.x264_param_apply_profile = x264_param_apply_profile;
+ dyn.x264_param_default_preset = x264_param_default_preset;
+ dyn.x264_param_parse = x264_param_parse;
+ dyn.x264_picture_init = x264_picture_init;
+ return dyn;
+ }
+
+ // Uh-oh, our currently loaded library doesn't have the required support.
+ // Let's try to dynamically load a 10-bit version; in particular, Debian
+ // has a version in /usr/lib/x86_64-linux-gnu/x264-10bit/libx264.so.<soname>,
+ // so we try to figure out where our libx264 comes from, and modify that path.
+ string x264_dir, x264_suffix;
+ void *handle = dlopen(nullptr, RTLD_NOW);
+ link_map *m;
+ int err = dlinfo(handle, RTLD_DI_LINKMAP, &m);
+ assert(err != -1);
+ for ( ; m != nullptr; m = m->l_next) {
+ if (m->l_name == nullptr) {
+ continue;
+ }
+ const char *ptr = strstr(m->l_name, "/libx264.so.");
+ if (ptr != nullptr) {
+ x264_dir = string(m->l_name, ptr - m->l_name);
+ x264_suffix = string(ptr, (m->l_name + strlen(m->l_name)) - ptr);
+ break;
+ }
+ }
+ dlclose(handle);
+
+ if (x264_dir.empty()) {
+ fprintf(stderr, "ERROR: Requested %d-bit x264, but is not linked to such an x264, and could not find one.\n",
+ depth);
+ exit(1);
+ }
+
+ string x264_10b_string = x264_dir + "/x264-10bit" + x264_suffix;
+ void *x264_dlhandle = dlopen(x264_10b_string.c_str(), RTLD_NOW);
+ if (x264_dlhandle == nullptr) {
+ fprintf(stderr, "ERROR: Requested %d-bit x264, but is not linked to such an x264, and %s would not load.\n",
+ depth, x264_10b_string.c_str());
+ exit(1);
+ }
+
+ dyn.handle = x264_dlhandle;
+ dyn.x264_encoder_close = (decltype(::x264_encoder_close) *)dlsym(x264_dlhandle, "x264_encoder_close");
+ dyn.x264_encoder_delayed_frames = (decltype(::x264_encoder_delayed_frames) *)dlsym(x264_dlhandle, "x264_encoder_delayed_frames");
+ dyn.x264_encoder_encode = (decltype(::x264_encoder_encode) *)dlsym(x264_dlhandle, "x264_encoder_encode");
+ dyn.x264_encoder_headers = (decltype(::x264_encoder_headers) *)dlsym(x264_dlhandle, "x264_encoder_headers");
+ char x264_encoder_open_symname[256];
+ snprintf(x264_encoder_open_symname, sizeof(x264_encoder_open_symname), "x264_encoder_open_%d", X264_BUILD);
+ dyn.x264_encoder_open = (decltype(::x264_encoder_open) *)dlsym(x264_dlhandle, x264_encoder_open_symname);
+ dyn.x264_encoder_parameters = (decltype(::x264_encoder_parameters) *)dlsym(x264_dlhandle, "x264_encoder_parameters");
+ dyn.x264_encoder_reconfig = (decltype(::x264_encoder_reconfig) *)dlsym(x264_dlhandle, "x264_encoder_reconfig");
+ dyn.x264_param_apply_profile = (decltype(::x264_param_apply_profile) *)dlsym(x264_dlhandle, "x264_param_apply_profile");
+ dyn.x264_param_default_preset = (decltype(::x264_param_default_preset) *)dlsym(x264_dlhandle, "x264_param_default_preset");
+ dyn.x264_param_parse = (decltype(::x264_param_parse) *)dlsym(x264_dlhandle, "x264_param_parse");
+ dyn.x264_picture_init = (decltype(::x264_picture_init) *)dlsym(x264_dlhandle, "x264_picture_init");
+ return dyn;
+}