Method begin

src/platforms/esp/32/codec/h264_hw_decoder.hpp:108–188

}

bool H264HwDecoder::begin(fl::filebuf_ptr stream) FL_NOEXCEPT {
    if (!stream) {
        mImpl->error = true;
        mImpl->errorMsg = "Null stream";
        return false;
    }
    mImpl->stream = stream;

    // Read all data from stream
    fl::size total = stream->size();
    if (total == 0) {
        fl::u8 buf[1024];
        while (true) {
            fl::size n = stream->read(buf, sizeof(buf));
            if (n == 0) break;
            for (fl::size i = 0; i < n; i++) {
                mImpl->mp4Data.push_back(buf[i]);
            }
        }
    } else {
        mImpl->mp4Data.resize(total);
        stream->read(mImpl->mp4Data.data(), total);
    }

    if (mImpl->mp4Data.empty()) {
        mImpl->error = true;
        mImpl->errorMsg = "No data read from stream";
        return false;
    }

    // Parse MP4 container
    fl::string parseError;
    mImpl->track = parseMp4(mImpl->mp4Data, &parseError);
    if (!mImpl->track.isValid) {
        mImpl->error = true;
        mImpl->errorMsg = "MP4 parse failed: ";
        mImpl->errorMsg += parseError;
        return false;
    }

    // Parse H264 info for dimensions
    mImpl->info = H264::parseH264Info(mImpl->mp4Data, &parseError);
    if (!mImpl->info.isValid) {
        mImpl->error = true;
        mImpl->errorMsg = "H264 info parse failed: ";
        mImpl->errorMsg += parseError;
        return false;
    }

    // Extract Annex B NAL units
    mImpl->annexB = extractH264NalUnits(mImpl->mp4Data, mImpl->track, &parseError);
    if (mImpl->annexB.empty()) {
        mImpl->error = true;
        mImpl->errorMsg = "No NAL units extracted: ";
        mImpl->errorMsg += parseError;
        return false;
    }