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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FFmpegLibWrapper.h"
#include "FFmpegLog.h"
#include "MediaPrefs.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Types.h"
#include "prlink.h"
#define AV_LOG_DEBUG 48
namespace mozilla
{
FFmpegLibWrapper::FFmpegLibWrapper()
{
PodZero(this);
}
FFmpegLibWrapper::~FFmpegLibWrapper()
{
Unlink();
}
FFmpegLibWrapper::LinkResult
FFmpegLibWrapper::Link()
{
if (!mAVCodecLib || !mAVUtilLib) {
Unlink();
return LinkResult::NoProvidedLib;
}
avcodec_version =
(decltype(avcodec_version))PR_FindSymbol(mAVCodecLib, "avcodec_version");
if (!avcodec_version) {
Unlink();
return LinkResult::NoAVCodecVersion;
}
uint32_t version = avcodec_version();
uint32_t macro = (version >> 16) & 0xFFu;
mVersion = static_cast<int>(macro);
uint32_t micro = version & 0xFFu;
// A micro version >= 100 indicates that it's FFmpeg (as opposed to LibAV).
bool isFFMpeg = micro >= 100;
if (!isFFMpeg) {
if (macro == 57) {
// Due to current AVCodecContext binary incompatibility we can only
// support FFmpeg 57 at this stage.
Unlink();
return LinkResult::CannotUseLibAV57;
}
#ifdef MOZ_FFMPEG
if (version < (54u << 16 | 35u << 8 | 1u)
&& !MediaPrefs::LibavcodecAllowObsolete()) {
// Refuse any libavcodec version prior to 54.35.1.
// (Unless media.libavcodec.allow-obsolete==true)
Unlink();
return LinkResult::BlockedOldLibAVVersion;
}
#endif
}
enum {
AV_FUNC_AVUTIL_MASK = 1 << 8,
AV_FUNC_53 = 1 << 0,
AV_FUNC_54 = 1 << 1,
AV_FUNC_55 = 1 << 2,
AV_FUNC_56 = 1 << 3,
AV_FUNC_57 = 1 << 4,
AV_FUNC_58 = 1 << 5,
AV_FUNC_AVUTIL_53 = AV_FUNC_53 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVUTIL_54 = AV_FUNC_54 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVUTIL_55 = AV_FUNC_55 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVUTIL_56 = AV_FUNC_56 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVUTIL_57 = AV_FUNC_57 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVUTIL_58 = AV_FUNC_58 | AV_FUNC_AVUTIL_MASK,
AV_FUNC_AVCODEC_ALL = AV_FUNC_53 | AV_FUNC_54 | AV_FUNC_55 | AV_FUNC_56 | AV_FUNC_57 | AV_FUNC_58,
AV_FUNC_AVUTIL_ALL = AV_FUNC_AVCODEC_ALL | AV_FUNC_AVUTIL_MASK
};
switch (macro) {
case 53:
version = AV_FUNC_53;
break;
case 54:
version = AV_FUNC_54;
break;
case 55:
version = AV_FUNC_55;
break;
case 56:
version = AV_FUNC_56;
break;
case 57:
version = AV_FUNC_57;
break;
case 58:
version = AV_FUNC_58;
break;
default:
FFMPEG_LOG("Unknown avcodec version");
Unlink();
return isFFMpeg
? ((macro > 57)
? LinkResult::UnknownFutureFFMpegVersion
: LinkResult::UnknownOlderFFMpegVersion)
// All LibAV versions<54.35.1 are blocked, therefore we must be
// dealing with a later one.
: LinkResult::UnknownFutureLibAVVersion;
}
#define AV_FUNC_OPTION(func, ver) \
if ((ver) & version) { \
if (!(func = (decltype(func))PR_FindSymbol(((ver) & AV_FUNC_AVUTIL_MASK) ? mAVUtilLib : mAVCodecLib, #func))) { \
FFMPEG_LOG("Couldn't load function " # func); \
} \
} else { \
func = (decltype(func))nullptr; \
}
#define AV_FUNC(func, ver) \
AV_FUNC_OPTION(func, ver) \
if ((ver) & version && !func) { \
Unlink(); \
return isFFMpeg ? LinkResult::MissingFFMpegFunction \
: LinkResult::MissingLibAVFunction; \
}
AV_FUNC(av_lockmgr_register, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_alloc_context3, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_close, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_decode_audio4, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_decode_video2, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_find_decoder, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_flush_buffers, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_open2, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_register_all, AV_FUNC_AVCODEC_ALL)
AV_FUNC(av_init_packet, AV_FUNC_AVCODEC_ALL)
AV_FUNC(av_parser_init, AV_FUNC_AVCODEC_ALL)
AV_FUNC(av_parser_close, AV_FUNC_AVCODEC_ALL)
AV_FUNC(av_parser_parse2, AV_FUNC_AVCODEC_ALL)
AV_FUNC(avcodec_alloc_frame, (AV_FUNC_53 | AV_FUNC_54))
AV_FUNC(avcodec_get_frame_defaults, (AV_FUNC_53 | AV_FUNC_54))
AV_FUNC(avcodec_free_frame, AV_FUNC_54)
AV_FUNC(av_log_set_level, AV_FUNC_AVUTIL_ALL)
AV_FUNC(av_malloc, AV_FUNC_AVUTIL_ALL)
AV_FUNC(av_freep, AV_FUNC_AVUTIL_ALL)
AV_FUNC(av_frame_alloc, (AV_FUNC_AVUTIL_55 | AV_FUNC_AVUTIL_56 | AV_FUNC_AVUTIL_57 | AV_FUNC_AVUTIL_58))
AV_FUNC(av_frame_free, (AV_FUNC_AVUTIL_55 | AV_FUNC_AVUTIL_56 | AV_FUNC_AVUTIL_57 | AV_FUNC_AVUTIL_58))
AV_FUNC(av_frame_unref, (AV_FUNC_AVUTIL_55 | AV_FUNC_AVUTIL_56 | AV_FUNC_AVUTIL_57 | AV_FUNC_AVUTIL_58))
AV_FUNC_OPTION(av_frame_get_colorspace, AV_FUNC_AVUTIL_ALL)
#undef AV_FUNC
#undef AV_FUNC_OPTION
avcodec_register_all();
#ifdef DEBUG
av_log_set_level(AV_LOG_DEBUG);
#endif
return LinkResult::Success;
}
void
FFmpegLibWrapper::Unlink()
{
if (av_lockmgr_register) {
// Registering a null lockmgr cause the destruction of libav* global mutexes
// as the default lockmgr that allocated them will be deregistered.
// This prevents ASAN and valgrind to report sizeof(pthread_mutex_t) leaks.
av_lockmgr_register(nullptr);
}
if (mAVUtilLib && mAVUtilLib != mAVCodecLib) {
PR_UnloadLibrary(mAVUtilLib);
}
if (mAVCodecLib) {
PR_UnloadLibrary(mAVCodecLib);
}
PodZero(this);
}
} // namespace mozilla
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