Ping for review. > On Oct 24, 2022, at 11:16, Zhao Zhili <quinkbl...@foxmail.com> wrote: > > From: Zhao Zhili <zhiliz...@tencent.com> > > Firstly, some bugs were fixed (patch 1-4). > > Patch 5 and 6 make mediacodec_wrapper support Java MediaCodec and NDK > MediaCodec. The use case I'm considering is run FFmpeg on cmdline without JVM, > for example, run FFmpeg inside of termux (an Android terminal emulator). It's > well known that NDK MediaCodec missing some important functions, like get the > list of codecs, but still useable. > > Patch 7 add NDK MediaCodec decoder support. It can be enabled via options, > and enabled automatically if no JVM is available. > > Patch 8 add ANativeWindow support to hwcontext_mediacodec. It can be set by > user, and can be created via AMediaCodec_createPersistentInputSurface > automatically. This is a preparation for encoder. > > Patch 9 makes MediaCodec decoder to support ANativeWindow directly. It worth > to note that AVMediaCodecContext has only surface. Although we provided > av_mediacodec_alloc_context(), we didn't strictly prevent users to allocate > AVMediaCodecContext on stack. I'm not sure if it's OK to add new field to > AVMediaCodecContext. > > Patch 10 add MediaCodec encoder support. Frame can be feed to encoder via > buffer, or via Surface/ANativeWindow. If Surface/ANativeWindow is used, and > the frames come from our MediaCodec decoder wrapper, we can control it's > 'render' (send to encoder's surface) via av_mediacodec_release_buffer(). A DTS > generation strategy works in this case. However, if frames comes from other > sources, like a camera, there is no way to control the 'render' yet, so DTS is > missing in this case. > > Finally, we can do mediacodec transcoding with FFmpeg cmdline on Android. > More importantly, we can do MediaCodec decoder to encoder without copy frames, > although it's very limited since most of avfilters doesn't work. For example: > > ./ffmpeg -hwaccel mediacodec -hwaccel_output_format mediacodec -i > /sdcard/test.mp4 -an -c:v h264_mediacodec -y /sdcard/out.mp4 > > Since there is no real AVHWFrameContext implementation in > hwcontext_mediacodec. > there is no hwframe_ctx for mediacodec and av_hwframe_transfer_data() doesn't > work. So if -hwaccel_output_format isn't being specified like: > > ./ffmpeg -hwaccel mediacodec -i /sdcard/test.mp4 -an -c:v h264_mediacodec -y > /sdcard/out.mp4 > > It will trigger a crash in av_hwframe_transfer_data. Patch 11 add a check on > hwframe_ctx. Patch 12 set hwaccel_output_format automatically to avoid such > case. > > > Zhao Zhili (12): > avcodec/mediacodec: fix incorrect crop info > avcodec/mediacodecdec: don't break out if both input and output port > return try again > avcodec/mediacodecdec_common: fix misuse av_free/av_freep > avcodec/mediacodecdec_common: fix useless av_buffer_unref > avcodec/mediacodec_wrapper: separate implementation from interface > avcodec/mediacodec: add NDK media codec wrapper > avcodec/mediacodecdec: enable NDK mediacodec > avutil/hwcontext_mediacodec: add ANativeWindow support > avcodec/mediacodec: add ANativeWindow support > avcodec: add MediaCodec encoder > avutil/hwcontext: verify hw_frames_ctx in transfer_data_alloc > fftools/ffmpeg_opt: set default hwaccel_output_format for mediacodec > > Changelog | 2 + > configure | 6 + > fftools/ffmpeg_opt.c | 4 + > libavcodec/Makefile | 2 + > libavcodec/allcodecs.c | 2 + > libavcodec/mediacodec_surface.c | 46 +- > libavcodec/mediacodec_surface.h | 8 +- > libavcodec/mediacodec_wrapper.c | 942 +++++++++++++++++++++++++++--- > libavcodec/mediacodec_wrapper.h | 275 +++++++-- > libavcodec/mediacodecdec.c | 21 +- > libavcodec/mediacodecdec_common.c | 35 +- > libavcodec/mediacodecdec_common.h | 1 + > libavcodec/mediacodecenc.c | 495 ++++++++++++++++ > libavcodec/version.h | 2 +- > libavutil/hwcontext.c | 6 +- > libavutil/hwcontext_mediacodec.c | 56 +- > libavutil/hwcontext_mediacodec.h | 11 + > libavutil/version.h | 4 +- > 18 files changed, 1780 insertions(+), 138 deletions(-) > create mode 100644 libavcodec/mediacodecenc.c > > -- > 2.25.1 > >
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