1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/** (c) Nullsoft, Inc. C O N F I D E N T I A L
** Filename:
** Project:
** Description:
** Author: Ben Allison benski@nullsoft.com
** Created:
**/
#include "main.h"
#include <stddef.h>
#include "DecodeFile.h"
#include "ExtendedReader.h"
#include "OutputPluginAudioStream.h"
#include "ResamplingReader.h"
#include "CommonReader.h"
// "input" means input FROM the decoder, "output" means output TO the person using the ifc_audiostream
static bool RequiresResampling(const AudioParameters *input, size_t outputChannels, size_t outputBits, size_t outputSampleRate)
{
if (outputChannels != input->channels)
return true; // need to up or downmix
if (outputBits != input->bitsPerSample)
return true;
if (outputSampleRate != input->sampleRate)
return true;
return false;
}
static void SetResamplingParameters(const AudioParameters *input, size_t &outputChannels, size_t &outputBits, size_t &outputSampleRate)
{
// channels
if (!outputChannels)
outputChannels=input->channels;
else if ((input->flags & AUDIOPARAMETERS_MAXCHANNELS) && input->channels <= outputChannels)
outputChannels = input->channels;
// bits
if (!outputBits) outputBits = input->bitsPerSample;
// samplerate
if (!outputSampleRate)
outputSampleRate = input->sampleRate;
else if ((input->flags & AUDIOPARAMETERS_MAXSAMPLERATE) && input->sampleRate <= outputSampleRate)
outputSampleRate = input->sampleRate;
}
ifc_audiostream *DecodeFile::OpenAudio(const wchar_t *filename, AudioParameters *parameters)
{
// save some info
size_t outputChannels = parameters->channels;
size_t outputBits = parameters->bitsPerSample;
size_t outputSampleRate = parameters->sampleRate;
CommonReader *reader = MakeReader(filename, parameters, true);
if (!reader)
return 0;
// check if they've requested certain output parameters
if (outputChannels || outputBits || outputSampleRate)
{
SetResamplingParameters(parameters, outputChannels, outputBits, outputSampleRate);
// check if we need any resampling/conversion
if (RequiresResampling(parameters, outputChannels, outputBits, outputSampleRate))
{
Resampler *resampler = new Resampler(parameters->bitsPerSample, parameters->channels, parameters->sampleRate,
outputBits, outputChannels, outputSampleRate, parameters->flags & AUDIOPARAMETERS_FLOAT);
if (!resampler->OK())
{
parameters->errorCode = API_DECODEFILE_BAD_RESAMPLE;
delete resampler;
return 0;
}
parameters->bitsPerSample = (uint32_t)outputBits;
parameters->channels = (uint32_t)outputChannels;
parameters->sampleRate = (uint32_t)outputSampleRate;
parameters->sizeBytes =(size_t)((double)parameters->sizeBytes * resampler->sizeFactor);
ResamplingReader *resampleReader = new ResamplingReader(resampler, reader, outputChannels * outputBits / 8);
return resampleReader;
}
}
return reader;
}
ifc_audiostream *DecodeFile::OpenAudioBackground(const wchar_t *filename, AudioParameters *parameters)
{
// save some info
size_t outputChannels = parameters->channels;
size_t outputBits = parameters->bitsPerSample;
size_t outputSampleRate = parameters->sampleRate;
CommonReader *reader = MakeReader(filename, parameters, false);
if (!reader)
return 0;
// check if they've requested certain output parameters
if (outputChannels || outputBits || outputSampleRate)
{
SetResamplingParameters(parameters, outputChannels, outputBits, outputSampleRate);
// check if we need any resampling/conversion
if (RequiresResampling(parameters, outputChannels, outputBits, outputSampleRate))
{
Resampler *resampler = new Resampler(parameters->bitsPerSample, parameters->channels, parameters->sampleRate,
outputBits, outputChannels, outputSampleRate, parameters->flags & AUDIOPARAMETERS_FLOAT);
if (!resampler->OK())
{
parameters->errorCode = API_DECODEFILE_BAD_RESAMPLE;
delete resampler;
delete reader;
return 0;
}
parameters->bitsPerSample = (uint32_t)outputBits;
parameters->channels = (uint32_t)outputChannels;
parameters->sampleRate = (uint32_t)outputSampleRate;
ResamplingReader *resampleReader = new ResamplingReader(resampler, reader, outputChannels * outputBits / 8);
return resampleReader;
}
}
return reader;
}
CommonReader *DecodeFile::MakeReader(const wchar_t *filename, AudioParameters *parameters, bool useUnagi)
{
In_Module *in;
int a = 0;
bool found = false;
while (a >= 0)
{
OpenFunc open = 0, openFloat=0;
OpenWFunc openW=0, openWFloat=0;
GetDataFunc getData = 0;
CloseFunc close = 0;
SetTimeFunc setTime = 0;
in = in_setmod_noplay(filename, &a);
if (!in) break;
if (a >= 0) a++;
found = true;
open = (OpenFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_open");
openFloat = (OpenFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_open_float");
openW = (OpenWFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_openW");
openWFloat = (OpenWFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_openW_float");
getData = (GetDataFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_getData");
close = (CloseFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_close");
setTime = (SetTimeFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_setTime"); //optional!
if ((open || openW) && getData && close)
{
ExtendedReader *reader = new ExtendedReader(open, openW, openFloat, openWFloat, getData, close, setTime);
if (reader->Open(filename, parameters))
return reader;
else
delete reader;
}
}
if (!found || !useUnagi)
{
parameters->errorCode = API_DECODEFILE_UNSUPPORTED;
}
else
{
OutputPluginAudioStream *reader = new OutputPluginAudioStream;
in = in_setmod_noplay(filename, 0);
if (reader->Open(in, filename, parameters))
return reader;
delete reader;
}
return 0;
}
void DecodeFile::CloseAudio(ifc_audiostream *audioStream)
{
CommonReader *reader = static_cast<CommonReader *>(audioStream);
delete reader;
//audioStream=0;
}
#define CBCLASS DecodeFile
START_DISPATCH;
CB(API_DECODEFILE_OPENAUDIO, OpenAudio)
CB(API_DECODEFILE_OPENAUDIO2, OpenAudioBackground)
VCB(API_DECODEFILE_CLOSEAUDIO, CloseAudio)
END_DISPATCH;
|
