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-rw-r--r--dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp178
1 files changed, 178 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp
new file mode 100644
index 000000000..f3dc00ad7
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp
@@ -0,0 +1,178 @@
+/* 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_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_AVCODEC_ALL = AV_FUNC_53 | AV_FUNC_54 | AV_FUNC_55 | AV_FUNC_56 | AV_FUNC_57,
+ 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;
+ 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(av_frame_free, (AV_FUNC_AVUTIL_55 | AV_FUNC_AVUTIL_56 | AV_FUNC_AVUTIL_57))
+ AV_FUNC(av_frame_unref, (AV_FUNC_AVUTIL_55 | AV_FUNC_AVUTIL_56 | AV_FUNC_AVUTIL_57))
+ 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 \ No newline at end of file