| 8 | #include <minimp3/minimp3.h> |
| 9 | |
| 10 | bool MP3Decoder::Convert(ReadStream* stream, AudioDataInfo& info, Array<byte>& result, uint32 offset) |
| 11 | { |
| 12 | ASSERT(stream); |
| 13 | |
| 14 | mStream = stream; |
| 15 | mStream->SetPosition(offset); |
| 16 | |
| 17 | int32 dataSize = mStream->GetLength() - offset; |
| 18 | Array<byte> dataBytes; |
| 19 | dataBytes.Resize(dataSize); |
| 20 | byte* data = dataBytes.Get(); |
| 21 | mStream->ReadBytes(data, dataSize); |
| 22 | |
| 23 | info.NumSamples = 0; |
| 24 | info.SampleRate = 0; |
| 25 | info.NumChannels = 0; |
| 26 | info.BitDepth = 16; |
| 27 | |
| 28 | mp3dec_frame_info_t mp3Info; |
| 29 | short pcm[MINIMP3_MAX_SAMPLES_PER_FRAME]; |
| 30 | |
| 31 | MemoryWriteStream output(Math::RoundUpToPowerOf2(dataSize)); |
| 32 | |
| 33 | do |
| 34 | { |
| 35 | const int32 samples = mp3dec_decode_frame(&mp3d, data, dataSize, pcm, &mp3Info); |
| 36 | if (samples) |
| 37 | { |
| 38 | info.NumSamples += samples * mp3Info.channels; |
| 39 | |
| 40 | output.WriteBytes(pcm, samples * 2 * mp3Info.channels); |
| 41 | |
| 42 | if (!info.SampleRate) |
| 43 | info.SampleRate = mp3Info.hz; |
| 44 | if (!info.NumChannels) |
| 45 | info.NumChannels = mp3Info.channels; |
| 46 | if (info.SampleRate != mp3Info.hz || info.NumChannels != mp3Info.channels) |
| 47 | break; |
| 48 | } |
| 49 | data += mp3Info.frame_bytes; |
| 50 | dataSize -= mp3Info.frame_bytes; |
| 51 | } while (mp3Info.frame_bytes); |
| 52 | |
| 53 | if (info.SampleRate == 0) |
| 54 | return true; |
| 55 | |
| 56 | // Load the whole audio data |
| 57 | const int32 bytesPerSample = info.BitDepth / 8; |
| 58 | const int32 bufferSize = info.NumSamples * bytesPerSample; |
| 59 | result.Set(output.GetHandle(), bufferSize); |
| 60 | |
| 61 | return false; |
| 62 | } |
| 63 | |
| 64 | bool MP3Decoder::Open(ReadStream* stream, AudioDataInfo& info, uint32 offset) |
| 65 | { |
no test coverage detected