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1 | #ifdef __GNUG__ | |
2 | #pragma implementation "sndmulaw.h" | |
3 | #endif | |
4 | ||
5 | #include "sndsnd.h" | |
6 | #include "sndfrmt.h" | |
7 | #include "sndadpcm.h" | |
8 | #include "adpcm/g72x.h" | |
9 | ||
10 | wxSoundAdpcmCodec::wxSoundAdpcmCodec() | |
11 | : wxSoundCodec() | |
12 | { | |
13 | // TODO: For the moment, only 1 channel is supported. | |
14 | m_codec_state = new g72x_state; | |
15 | g72x_init_state(m_codec_state); | |
16 | } | |
17 | ||
18 | wxSoundAdpcmCodec::~wxSoundAdpcmCodec() | |
19 | { | |
20 | } | |
21 | ||
22 | void wxSoundAdpcmCodec::InitWith(const wxSoundDataFormat& format) | |
23 | { | |
24 | m_srate = format.GetSampleRate(); | |
25 | } | |
26 | ||
27 | int wxSoundAdpcmCodec::GetBits(int nbits) | |
28 | { | |
29 | unsigned int mask; | |
30 | int bits; | |
31 | ||
32 | if (m_bits_waiting == 0) | |
33 | m_current_byte = m_in_sound->GetChar(); | |
34 | ||
35 | mask = (1 << nbits) - 1; | |
36 | bits = m_current_byte & mask; | |
37 | m_current_byte >>= nbits; | |
38 | m_bits_waiting -= nbits; | |
39 | return bits; | |
40 | } | |
41 | ||
42 | void wxSoundAdpcmCodec::Decode() | |
43 | { | |
44 | int smp, bits; | |
45 | wxSoundDataFormat pref_frmt; | |
46 | ||
47 | pref_frmt = GetPreferredFormat(0); | |
48 | if (!(m_io_format == pref_frmt)) | |
49 | ChainCodecAfter(pref_frmt); | |
50 | ||
51 | bits = GetBits(4); | |
52 | if (m_io_format.GetByteOrder() == wxSND_SAMPLE_LE) { | |
53 | while (!StreamOk()) { | |
54 | smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, m_codec_state); | |
55 | m_out_sound->PutChar(smp & 0x00ff); | |
56 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
57 | bits = GetBits(4); | |
58 | } | |
59 | } else { | |
60 | while (!StreamOk()) { | |
61 | smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, m_codec_state); | |
62 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
63 | m_out_sound->PutChar(smp & 0x00ff); | |
64 | bits = GetBits(4); | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | void wxSoundAdpcmCodec::Encode() | |
70 | { | |
71 | /* | |
72 | int smp; | |
73 | wxSoundDataFormat pref_frmt; | |
74 | ||
75 | pref_frmt = GetPreferredFormat(0); | |
76 | if (!(m_io_format == pref_frmt)) | |
77 | ChainCodecAfter(pref_frmt); | |
78 | ||
79 | bits = GetBits(4); | |
80 | if (m_io_format.GetByteOrder() == wxSND_SAMPLE_LE) { | |
81 | while (!StreamOk()) { | |
82 | smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, codec_state); | |
83 | m_out_sound->PutChar(smp & 0x00ff); | |
84 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
85 | bits = GetBits(4); | |
86 | } | |
87 | } else { | |
88 | while (!StreamOk()) { | |
89 | smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, codec_state); | |
90 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
91 | m_out_sound->PutChar(smp & 0x00ff); | |
92 | bits = GetBits(4); | |
93 | } | |
94 | } | |
95 | */ | |
96 | } | |
97 | ||
98 | size_t wxSoundAdpcmCodec::GetByteRate() const | |
99 | { | |
100 | return (m_io_format.GetSampleRate() * m_io_format.GetChannels()) / 2; | |
101 | } | |
102 | ||
103 | wxSoundDataFormat wxSoundAdpcmCodec::GetPreferredFormat(int WXUNUSED(no)) const | |
104 | { | |
105 | wxSoundDataFormat format; | |
106 | ||
107 | format.SetCodecNo(WXSOUND_PCM); | |
108 | format.SetSampleRate(m_srate); | |
109 | format.SetBps(16); | |
110 | format.SetChannels(1); | |
111 | format.SetSign(wxSND_SAMPLE_SIGNED); | |
112 | #ifdef USE_BE_MACH | |
113 | format.SetByteOrder(wxSND_SAMPLE_BE); | |
114 | #else | |
115 | format.SetByteOrder(wxSND_SAMPLE_LE); | |
116 | #endif | |
117 | return format; | |
118 | } |