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(Adp4Audio): implemented ADPS decoder.

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This commit is contained in:
morkt 2017-03-21 02:09:01 +04:00
parent 3cfdb81ffa
commit 511ba480b0
1 changed files with 59 additions and 6 deletions
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65
ArcFormats/GameSystem/AudioADP4.cs
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@ -38,23 +38,33 @@ namespace GameRes.Formats.GameSystem
public override uint Signature { get { return 0; } }
public override bool CanWrite { get { return false; } }
public Adp4Audio ()
{
Extensions = new string[] { "adp4", "adps" };
}
const uint DefaultSampleRate = 44100; // XXX varies
public override SoundInput TryOpen (IBinaryStream file)
{
bool is_adp4 = file.Name.EndsWith (".adp4", StringComparison.InvariantCultureIgnoreCase);
if (!is_adp4 || file.Length <= 4)
bool is_adps = !is_adp4 && file.Name.EndsWith (".adps", StringComparison.InvariantCultureIgnoreCase);
if (!(is_adp4 || is_adps) || file.Length <= 4)
return null;
var decoder = new AdpDecoder (file);
var pcm = decoder.Decode();
var pcm = decoder.Decode (is_adps);
var format = new WaveFormat {
FormatTag = 1,
Channels = 2,
SamplesPerSecond = 44100, // XXX varies
SamplesPerSecond = DefaultSampleRate,
BlockAlign = 4,
BitsPerSample = 16,
};
format.SetBPS();
var input = new MemoryStream (pcm);
return new RawPcmInput (input, format);
var sound = new RawPcmInput (input, format);
file.Dispose();
return sound;
}
}
@ -69,15 +79,58 @@ namespace GameRes.Formats.GameSystem
byte[] m_output;
public byte[] Decode ()
public byte[] Decode (bool is_adps)
{
m_input.Position = 0;
int sample_count = m_input.ReadInt32();
if (is_adps)
{
m_input.Position = sample_count + 8;
sample_count = m_input.ReadInt32();
}
m_output = new byte[sample_count * 8];
DecodeBits (sample_count);
if (is_adps)
DecodeAdps (sample_count);
else
DecodeBits (sample_count);
return m_output;
}
void DecodeAdps (int sample_count)
{
uint sample = 0;
uint left_sample = 0;
uint right_sample = 0;
int dst = 0;
while (sample_count > 0)
{
uint bits = m_input.ReadUInt16();
left_sample += bits & 0xF;
int s = AdpSamples[left_sample] + (short)sample;
sample = sample >> 16 | (uint)(Clamp (s) << 16);
left_sample = AdpAdjust[left_sample];
right_sample += (bits >> 8) & 0xF;
s = AdpSamples[right_sample] + (short)sample;
sample = sample >> 16 | (uint)(Clamp (s) << 16);
right_sample = AdpAdjust[right_sample];
LittleEndian.Pack (sample, m_output, dst);
dst += 4;
left_sample += (bits >> 4) & 0xF;
s = AdpSamples[left_sample] + (short)sample;
sample = sample >> 16 | (uint)(Clamp (s) << 16);
left_sample = AdpAdjust[left_sample];
right_sample += bits >> 12;
s = AdpSamples[right_sample] + (short)sample;
sample = sample >> 16 | (uint)(Clamp (s) << 16);
right_sample = AdpAdjust[right_sample];
LittleEndian.Pack (sample, m_output, dst);
dst += 4;
sample_count -= 2;
}
}
void DecodeBits (int sample_count)
{
bool copy_stereo = true;