nsresult
FFmpegDataDecoder<LIBAV_VER>::InitDecoder()
{
FFMPEG_LOG("Initialising FFmpeg decoder.");
AVCodec* codec = FindAVCodec(mCodecID);
if (!codec) {
NS_WARNING("Couldn't find ffmpeg decoder");
return NS_ERROR_FAILURE;
}
StaticMutexAutoLock mon(sMonitor);
if (!(mCodecContext = avcodec_alloc_context3(codec))) {
NS_WARNING("Couldn't init ffmpeg context");
return NS_ERROR_FAILURE;
}
mCodecContext->opaque = this;
InitCodecContext();
if (mExtraData) {
mCodecContext->extradata_size = mExtraData->Length();
// FFmpeg may use SIMD instructions to access the data which reads the
// data in 32 bytes block. Must ensure we have enough data to read.
mExtraData->AppendElements(FF_INPUT_BUFFER_PADDING_SIZE);
mCodecContext->extradata = mExtraData->Elements();
} else {
mCodecContext->extradata_size = 0;
}
if (codec->capabilities & CODEC_CAP_DR1) {
mCodecContext->flags |= CODEC_FLAG_EMU_EDGE;
}
if (avcodec_open2(mCodecContext, codec, nullptr) < 0) {
NS_WARNING("Couldn't initialise ffmpeg decoder");
avcodec_close(mCodecContext);
av_freep(&mCodecContext);
return NS_ERROR_FAILURE;
}
if (mCodecContext->codec_type == AVMEDIA_TYPE_AUDIO &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_FLT &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_FLTP &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_S16 &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_S16P) {
NS_WARNING("FFmpeg audio decoder outputs unsupported audio format.");
return NS_ERROR_FAILURE;
}
FFMPEG_LOG("FFmpeg init successful.");
return NS_OK;
}
nsresult
FFmpegDataDecoder<LIBAV_VER>::InitDecoder()
{
FFMPEG_LOG("Initialising FFmpeg decoder.");
AVCodec* codec = FindAVCodec(mCodecID);
if (!codec) {
NS_WARNING("Couldn't find ffmpeg decoder");
return NS_ERROR_FAILURE;
}
StaticMutexAutoLock mon(sMonitor);
if (!(mCodecContext = avcodec_alloc_context3(codec))) {
NS_WARNING("Couldn't init ffmpeg context");
return NS_ERROR_FAILURE;
}
mCodecContext->opaque = this;
// FFmpeg takes this as a suggestion for what format to use for audio samples.
uint32_t major, minor;
FFmpegRuntimeLinker::GetVersion(major, minor);
// LibAV 0.8 produces rubbish float interlaved samples, request 16 bits audio.
mCodecContext->request_sample_fmt = major == 53 && minor <= 34 ?
AV_SAMPLE_FMT_S16 : AV_SAMPLE_FMT_FLT;
// FFmpeg will call back to this to negotiate a video pixel format.
mCodecContext->get_format = ChoosePixelFormat;
mCodecContext->thread_count = PR_GetNumberOfProcessors();
mCodecContext->thread_type = FF_THREAD_SLICE | FF_THREAD_FRAME;
mCodecContext->thread_safe_callbacks = false;
if (mExtraData) {
mCodecContext->extradata_size = mExtraData->Length();
// FFmpeg may use SIMD instructions to access the data which reads the
// data in 32 bytes block. Must ensure we have enough data to read.
mExtraData->AppendElements(FF_INPUT_BUFFER_PADDING_SIZE);
mCodecContext->extradata = mExtraData->Elements();
} else {
mCodecContext->extradata_size = 0;
}
if (codec->capabilities & CODEC_CAP_DR1) {
mCodecContext->flags |= CODEC_FLAG_EMU_EDGE;
}
if (avcodec_open2(mCodecContext, codec, nullptr) < 0) {
NS_WARNING("Couldn't initialise ffmpeg decoder");
avcodec_close(mCodecContext);
av_freep(&mCodecContext);
return NS_ERROR_FAILURE;
}
if (mCodecContext->codec_type == AVMEDIA_TYPE_AUDIO &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_FLT &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_FLTP &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_S16 &&
mCodecContext->sample_fmt != AV_SAMPLE_FMT_S16P) {
NS_WARNING("FFmpeg audio decoder outputs unsupported audio format.");
return NS_ERROR_FAILURE;
}
mCodecParser = av_parser_init(mCodecID);
if (mCodecParser) {
mCodecParser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
}
FFMPEG_LOG("FFmpeg init successful.");
return NS_OK;
}
