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Code Issues Projects Releases Wiki Activity

Olga's basic libav framework (#550)

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This commit is contained in:
Cameron Kaiser 2019-03-15 23:20:18 -07:00
parent 8868813757
commit 284830e5ef
2 changed files with 58 additions and 0 deletions
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54
dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.cpp
View File

@ -10,6 +10,12 @@
#include "mozilla/Preferences.h"
#include "prlink.h"
#ifdef XP_DARWIN
#include <dlfcn.h>
#include <libgen.h>
#include <mach-o/dyld.h>
#endif /* XP_DARWIN */
namespace mozilla
{
@ -40,7 +46,11 @@ static const char* sLibs[] = {
#endif
};
#ifdef XP_DARWIN
void* FFmpegRuntimeLinker::sLinkedLib = nullptr;
#else
PRLibrary* FFmpegRuntimeLinker::sLinkedLib = nullptr;
#endif /* XP_DARWIN */
const char* FFmpegRuntimeLinker::sLib = nullptr;
static unsigned (*avcodec_version)() = nullptr;
@ -60,12 +70,36 @@ FFmpegRuntimeLinker::Link()
MOZ_ASSERT(NS_IsMainThread());
#ifdef XP_DARWIN // Explanation below.
char execPath[PATH_MAX];
execPath[0] = '\0';
uint32_t pathlen = PATH_MAX;
_NSGetExecutablePath(execPath, &pathlen);
char *execDir = dirname(execPath);
#endif /* XP_DARWIN */
for (size_t i = 0; i < ArrayLength(sLibs); i++) {
const char* lib = sLibs[i];
#ifdef XP_DARWIN
/* Loading FFMPEG on Mac OS X (macOS is a typo) fails because mozilla
searches for sybols defined in libavutil with a handle to libavcodec.
This is due to the fact that NSPR uses NSAddressOfSymbol & cie who limits
its researches only to libavcodec and not its dependencies. We don't have
this issue with dlsym(). */
if (!(sLinkedLib = dlopen(lib, RTLD_NOW | RTLD_LOCAL))) {
/* Bonus time: if we don't find libavcodec in standard locations, we look
if our venerable FFMPEG's libraries are in the same folder as XUL. */
char *libFullPath = NULL;
if (asprintf(&libFullPath, "%s/%s", execDir, lib) > 0 && libFullPath)
sLinkedLib = dlopen(libFullPath, RTLD_NOW | RTLD_LOCAL);
free(libFullPath);
}
#else
PRLibSpec lspec;
lspec.type = PR_LibSpec_Pathname;
lspec.value.pathname = lib;
sLinkedLib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
#endif /* XP_DARWIN */
if (sLinkedLib) {
if (Bind(lib)) {
sLib = lib;
@ -92,7 +126,11 @@ FFmpegRuntimeLinker::Link()
/* static */ bool
FFmpegRuntimeLinker::Bind(const char* aLibName)
{
#ifdef XP_DARWIN
avcodec_version = (typeof(avcodec_version))dlsym(sLinkedLib,
#else
avcodec_version = (typeof(avcodec_version))PR_FindSymbol(sLinkedLib,
#endif /* XP_DARWIN */
"avcodec_version");
uint32_t fullVersion, major, minor, micro;
fullVersion = GetVersion(major, minor, micro);
@ -139,6 +177,17 @@ FFmpegRuntimeLinker::Bind(const char* aLibName)
}
#define LIBAVCODEC_ALLVERSION
#ifdef XP_DARWIN
#define AV_FUNC(func, ver) \
if ((ver) & version) { \
if (!(func = (typeof(func))dlsym(sLinkedLib, #func))) { \
FFMPEG_LOG("Couldn't load function " #func " from %s.", aLibName); \
return false; \
} \
} else { \
func = (typeof(func))nullptr; \
}
#else
#define AV_FUNC(func, ver) \
if ((ver) & version) { \
if (!(func = (typeof(func))PR_FindSymbol(sLinkedLib, #func))) { \
@ -148,6 +197,7 @@ FFmpegRuntimeLinker::Bind(const char* aLibName)
} else { \
func = (typeof(func))nullptr; \
}
#endif /* XP_DARWIN */
#include "FFmpegFunctionList.h"
#undef AV_FUNC
#undef LIBAVCODEC_ALLVERSION
@ -181,7 +231,11 @@ FFmpegRuntimeLinker::CreateDecoderModule()
FFmpegRuntimeLinker::Unlink()
{
if (sLinkedLib) {
#ifdef XP_DARWIN
dlclose(sLinkedLib);
#else
PR_UnloadLibrary(sLinkedLib);
#endif /* XP_DARWIN */
sLinkedLib = nullptr;
sLib = nullptr;
sLinkStatus = LinkStatus_INIT;

4
dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.h
View File

@ -40,7 +40,11 @@ public:
static uint32_t GetVersion(uint32_t& aMajor, uint32_t& aMinor, uint32_t& aMicro);
private:
#ifdef XP_DARWIN
static void* sLinkedLib;
#else
static PRLibrary* sLinkedLib;
#endif /* XP_DARWIN */
static const char* sLib;
static bool Bind(const char* aLibName);