decodeStream()

Decoded autoresearch::mp3_check::decodeStream ( fl::third_party::mp3dec_t * dec, fl::third_party::mp3dec_scratch_t * scratch, fl::i16 * pcm, const mp3_fixture::Stream & stream )

inline

Decode one stream.

dec is supplied by the caller so the same decoder can be driven across two streams of different layers, which is what exercises the Layer I/II + Layer III scratch union on real hardware.

Definition at line 98 of file AutoResearchMp3.h.

                                                                         {
    Decoded out;
    out.fnv1a = 2166136261u;
    out.samples = 0;
    out.frames = 0;
    out.hz = 0;
    out.channels = 0;
    out.layer = 0;
 
    fl::u32 offset = 0;
    while (offset + 4 < stream.size) {
        fl::third_party::mp3dec_frame_info_t info;
        fl::memset(&info, 0, sizeof(info));
        const int samples = fl::third_party::mp3dec_decode_frame_r(
            dec, scratch, stream.data + offset, (int)(stream.size - offset),
            pcm, &info);
        if (info.frame_bytes <= 0) {
            break;
        }
        offset += (fl::u32)info.frame_bytes;
        if (samples > 0) {
            const fl::u32 count = (fl::u32)samples * (fl::u32)info.channels;
            out.fnv1a = fnv1a(out.fnv1a, pcm, count);
            out.samples += count;
            ++out.frames;
            out.hz = (fl::u32)info.hz;
            out.channels = (fl::u32)info.channels;
            out.layer = (fl::u32)info.layer;
        }
    }
    return out;
}

References autoresearch::mp3_check::Decoded::channels, autoresearch::mp3_fixture::Stream::data, autoresearch::mp3_check::Decoded::fnv1a, fnv1a(), autoresearch::mp3_check::Decoded::frames, autoresearch::mp3_check::Decoded::hz, autoresearch::mp3_check::Decoded::layer, fl::memset(), offset(), autoresearch::mp3_check::Decoded::samples, and autoresearch::mp3_fixture::Stream::size.

Referenced by run().

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