Hi everyone,
I am trying to use FFmpeg's mediacodec wrappers on Android to speed up some
h264 decoding.
First if someone has a good exemple of how to use ffmpeg + mediacodec natively
I would be pleased to see it !
I have compiled ffmpeg using --enable-decoder=h264_mediacodec
--enable-mediacodec --enable-hwaccel=h264_mediacodec and I have trouble using
the mediacodec decoder. I detect the h264_mediacodec but cannot open it (return
is -542398533, not very explicit). Do I have to set the codec context in some
special manner to use HW acceleration ? Also h264 and h264_mediacodec seems to
have the same id, how would the decoder know which one to use ?
Regards,
Yoann
int open_stream_component(VideoState *vs, int stream_index){
AVFormatContext *format_context = vs->format_context;
AVCodecParameters *codec_parameters = NULL;
AVCodecContext *codec_context = NULL;
AVCodec *codec = NULL;
AVDictionary *options_dict = NULL;
SDL_AudioSpec wanted_spec, spec;
codec_parameters = format_context->streams[stream_index]->codecpar;
AVCodec * cdc = av_codec_next(NULL);
while(cdc != NULL){
SDL_Log("%s\n", cdc->long_name);
cdc = av_codec_next(cdc);
}
if(codec_parameters->codec_type == AVMEDIA_TYPE_VIDEO){
codec = avcodec_find_decoder_by_name("h264_mediacodec");
} else if(codec_parameters->codec_type == AVMEDIA_TYPE_AUDIO){
codec = avcodec_find_decoder_by_name("aac");
}
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Codec is %s
\n",codec->long_name);
codec_context = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(codec_context, codec_parameters);
codec_context->codec_id = codec->id;
// Error here
int ret = 0;
if((ret = avcodec_open2(codec_context, codec, &options_dict)) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Can't open codec, ret =
%d", ret);
return -1;
}
/* end of code */
}
Corresponding Logcat :
01-05 17:30:04.350: W/SDL/APP(12633): Main thread tid : 12659
01-05 17:30:04.470: V/SDL(12633): onWindowFocusChanged(): true
01-05 17:30:15.610: I/SDL/APP(12633): ===== Setting input file =====
01-05 17:30:15.610: I/SDL/APP(12633): In set_in_path : in_filepath =
/storage/emulated/0/Movies/test.mp4
01-05 17:30:15.610: I/SDL/APP(12633): ===== Start =====
01-05 17:30:15.610: W/SDL/APP(12633): demux_thread tid : 13218
01-05 17:30:15.700: I/SDL/APP(12633): Network stream open and header read
01-05 17:30:15.800: I/SDL/APP(12633): H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
01-05 17:30:15.800: I/SDL/APP(12633): H.264 Android MediaCodec decoder
01-05 17:30:15.800: I/SDL/APP(12633): MJPEG (Motion JPEG)
01-05 17:30:15.800: I/SDL/APP(12633): AAC (Advanced Audio Coding)
01-05 17:30:15.800: I/SDL/APP(12633): MP3 (MPEG audio layer 3)
01-05 17:30:15.800: I/SDL/APP(12633): Codec is H.264 Android MediaCodec decoder
01-05 17:30:15.800: E/SDL/APP(12633): Can't open codec, ret = -542398533
01-05 17:30:15.810: I/SDL/APP(12633): ===== Stop =====
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