ayulij/ffmpeg-mediacodec-encoder

[experimental] FFMPEG hardware encoder for Android

ffmpeg-mediacodec-encoder

[WIP] FFMPEG hardware encoder for Android

Why ?

• hardware support on Android is only available for decoder
• libx264 and other sw encoders are slow on Android

Sources

• https://trac.ffmpeg.org/wiki/HWAccelIntro
• https://github.com/FFmpeg/FFmpeg/search?p=1&q=mediacodec&unscoped_q=mediacodec
• tanersener/mobile-ffmpeg#225
• http://ogorkis.net/ffmpeg (Old and use deprecated functions)

TODO

• Create an android project
• add FFMPEG lib
• create a stub C encoder
• implement Mediacodec encoder

How to

Build FFmpeg for Android

https://github.com/madhavanmalolan/ffmpegandroidlibrary/wiki/Building-from-source

https://github.com/Javernaut/ffmpeg-android-maker/blob/master/ffmpeg-android-maker.sh

https://yesimroy.gitbooks.io/android-note/content/compile_ffmpeg_for_android.html

https://syllogismobile.wordpress.com/2018/08/19/building-ffmpeg-4-0-for-android-with-clang/

https://github.com/tanersener/mobile-ffmpeg/blob/master/android.sh

https://github.com/binglingziyu/ffmpeg-android-build

Create a script to:

• Clone FFmpeg from git
• Configure NDK
• Setup toolchain(s)
• Configure FFmpeg
• Build

Create a minimal FFMPEG H264 encoder

Based on Videotoolbox encoder

//  filename: mediacodecenc.c

static const AVClass h264_mediacodec_class = {
    .class_name = "h264_mediacodec",
    .item_name  = av_default_item_name,
    .option     = h264_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_h264_mediacodec_encoder = {
    .name             = "h264_mediacodec",
    .long_name        = NULL_IF_CONFIG_SMALL("Mediacodec H.264 Encoder"),
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_H264,
    .priv_data_size   = sizeof(VTEncContext),
    .pix_fmts         = avc_pix_fmts,
    .init             = vtenc_init,
    .encode2          = vtenc_frame,
    .close            = vtenc_close,
    .capabilities     = AV_CODEC_CAP_DELAY,
    .priv_class       = &h264_mediacodec_class,
    .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |
                        FF_CODEC_CAP_INIT_CLEANUP,
};