decodeFrame()

int fl::third_party::Mp3Minimp3Decoder::decodeFrame	(	const fl::u8 **	inbuf,
		fl::size *	bytes_left )

Definition at line 197 of file mp3.cpp.hpp.

                                                                    {
    if (!mDecoder || !mScratch || !mPcmBuffer || !inbuf || !bytes_left ||
        !*inbuf || *bytes_left == 0) {
        return -1;
    }
 
    const fl::u8* input = *inbuf;
    const fl::size max_input = 0x7fffffff;
    const int input_bytes = static_cast<int>(
        *bytes_left > max_input ? max_input : *bytes_left);
    mp3dec_frame_info_t info = {};
    const int samples = mp3dec_decode_frame_r(
        mDecoder.get(), mScratch.get(), input, input_bytes, mPcmBuffer.get(),
        &info);
    if (samples <= 0 || info.frame_bytes <= 0 ||
        static_cast<fl::size>(info.frame_bytes) > *bytes_left) {
        return -1;
    }
 
    const fl::u8* header = input + info.frame_offset;
    *inbuf += info.frame_bytes;
    *bytes_left -= static_cast<fl::size>(info.frame_bytes);
 
    int frame_bytes = info.frame_bytes - info.frame_offset;
    if (frame_bytes > 0 && (header[2] & 0x02) != 0) {
        --frame_bytes;
    }
    mFrameInfo.bitrate = info.bitrate_kbps * 1000;
    if (mFrameInfo.bitrate == 0 && samples > 0 && frame_bytes > 0) {
        mFrameInfo.bitrate =
            (frame_bytes * info.hz * 8) / samples;
    }
    mFrameInfo.nChans = info.channels;
    mFrameInfo.samprate = info.hz;
    mFrameInfo.bitsPerSample = 16;
    mFrameInfo.outputSamps = samples * info.channels;
    mFrameInfo.layer = info.layer;
    mFrameInfo.version = minimp3Version(header);
    return 0;
}

References mp3dec_frame_info_t::bitrate_kbps, mp3dec_frame_info_t::channels, fl::FL_NO_EXCEPT, mp3dec_frame_info_t::frame_bytes, mp3dec_frame_info_t::frame_offset, mp3dec_frame_info_t::hz, mp3dec_frame_info_t::layer, mDecoder, mFrameInfo, mp3dec_decode_frame_r(), mPcmBuffer, and mScratch.

Referenced by decode(), and fl::Mp3::parseMp3Info().

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