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#include "gig.h" |
#include "gig.h" |
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namespace gig { |
namespace gig { namespace { |
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// *************** Internal functions for sample decopmression *************** |
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// * |
30 |
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31 |
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inline int get12lo(const unsigned char* pSrc) |
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{ |
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const int x = pSrc[0] | (pSrc[1] & 0x0f) << 8; |
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return x & 0x800 ? x - 0x1000 : x; |
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} |
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|
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inline int get12hi(const unsigned char* pSrc) |
38 |
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{ |
39 |
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const int x = pSrc[1] >> 4 | pSrc[2] << 4; |
40 |
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return x & 0x800 ? x - 0x1000 : x; |
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} |
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43 |
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inline int16_t get16(const unsigned char* pSrc) |
44 |
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{ |
45 |
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return int16_t(pSrc[0] | pSrc[1] << 8); |
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} |
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48 |
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inline int get24(const unsigned char* pSrc) |
49 |
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{ |
50 |
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const int x = pSrc[0] | pSrc[1] << 8 | pSrc[2] << 16; |
51 |
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return x & 0x800000 ? x - 0x1000000 : x; |
52 |
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} |
53 |
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54 |
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void Decompress16(int compressionmode, const unsigned char* params, |
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int srcStep, const unsigned char* pSrc, int16_t* pDst, |
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unsigned long currentframeoffset, |
57 |
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unsigned long copysamples) |
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{ |
59 |
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switch (compressionmode) { |
60 |
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case 0: // 16 bit uncompressed |
61 |
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pSrc += currentframeoffset * srcStep; |
62 |
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while (copysamples) { |
63 |
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*pDst = get16(pSrc); |
64 |
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pDst += 2; |
65 |
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pSrc += srcStep; |
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copysamples--; |
67 |
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} |
68 |
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break; |
69 |
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|
70 |
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case 1: // 16 bit compressed to 8 bit |
71 |
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int y = get16(params); |
72 |
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int dy = get16(params + 2); |
73 |
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while (currentframeoffset) { |
74 |
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dy -= int8_t(*pSrc); |
75 |
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y -= dy; |
76 |
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pSrc += srcStep; |
77 |
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currentframeoffset--; |
78 |
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} |
79 |
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while (copysamples) { |
80 |
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dy -= int8_t(*pSrc); |
81 |
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y -= dy; |
82 |
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*pDst = y; |
83 |
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pDst += 2; |
84 |
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pSrc += srcStep; |
85 |
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copysamples--; |
86 |
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} |
87 |
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break; |
88 |
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} |
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} |
90 |
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|
91 |
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void Decompress24(int compressionmode, const unsigned char* params, |
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const unsigned char* pSrc, int16_t* pDst, |
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unsigned long currentframeoffset, |
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unsigned long copysamples) |
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{ |
96 |
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// Note: The 24 bits are truncated to 16 bits for now. |
97 |
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|
98 |
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// Note: The calculation of the initial value of y is strange |
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// and not 100% correct. What should the first two parameters |
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// really be used for? Why are they two? The correct value for |
101 |
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// y seems to lie somewhere between the values of the first |
102 |
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// two parameters. |
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// |
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// Strange thing #2: The formula in SKIP_ONE gives values for |
105 |
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// y that are twice as high as they should be. That's why |
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// COPY_ONE shifts 9 steps instead of 8, and also why y is |
107 |
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// initialized with a sum instead of a mean value. |
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|
109 |
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int y, dy, ddy; |
110 |
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|
111 |
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#define GET_PARAMS(params) \ |
112 |
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y = (get24(params) + get24((params) + 3)); \ |
113 |
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dy = get24((params) + 6); \ |
114 |
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ddy = get24((params) + 9) |
115 |
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|
116 |
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#define SKIP_ONE(x) \ |
117 |
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ddy -= (x); \ |
118 |
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dy -= ddy; \ |
119 |
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y -= dy |
120 |
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|
121 |
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#define COPY_ONE(x) \ |
122 |
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SKIP_ONE(x); \ |
123 |
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*pDst = y >> 9; \ |
124 |
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pDst += 2 |
125 |
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|
126 |
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switch (compressionmode) { |
127 |
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case 2: // 24 bit uncompressed |
128 |
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pSrc += currentframeoffset * 3; |
129 |
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while (copysamples) { |
130 |
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*pDst = get24(pSrc) >> 8; |
131 |
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pDst += 2; |
132 |
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pSrc += 3; |
133 |
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copysamples--; |
134 |
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} |
135 |
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break; |
136 |
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|
137 |
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case 3: // 24 bit compressed to 16 bit |
138 |
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GET_PARAMS(params); |
139 |
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while (currentframeoffset) { |
140 |
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SKIP_ONE(get16(pSrc)); |
141 |
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pSrc += 2; |
142 |
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currentframeoffset--; |
143 |
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} |
144 |
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while (copysamples) { |
145 |
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COPY_ONE(get16(pSrc)); |
146 |
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pSrc += 2; |
147 |
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copysamples--; |
148 |
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} |
149 |
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break; |
150 |
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|
151 |
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case 4: // 24 bit compressed to 12 bit |
152 |
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GET_PARAMS(params); |
153 |
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while (currentframeoffset > 1) { |
154 |
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SKIP_ONE(get12lo(pSrc)); |
155 |
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SKIP_ONE(get12hi(pSrc)); |
156 |
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pSrc += 3; |
157 |
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currentframeoffset -= 2; |
158 |
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} |
159 |
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if (currentframeoffset) { |
160 |
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SKIP_ONE(get12lo(pSrc)); |
161 |
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currentframeoffset--; |
162 |
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if (copysamples) { |
163 |
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COPY_ONE(get12hi(pSrc)); |
164 |
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pSrc += 3; |
165 |
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copysamples--; |
166 |
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} |
167 |
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} |
168 |
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while (copysamples > 1) { |
169 |
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COPY_ONE(get12lo(pSrc)); |
170 |
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COPY_ONE(get12hi(pSrc)); |
171 |
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pSrc += 3; |
172 |
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copysamples -= 2; |
173 |
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} |
174 |
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if (copysamples) { |
175 |
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COPY_ONE(get12lo(pSrc)); |
176 |
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} |
177 |
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break; |
178 |
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|
179 |
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case 5: // 24 bit compressed to 8 bit |
180 |
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GET_PARAMS(params); |
181 |
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while (currentframeoffset) { |
182 |
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SKIP_ONE(int8_t(*pSrc++)); |
183 |
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currentframeoffset--; |
184 |
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} |
185 |
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while (copysamples) { |
186 |
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COPY_ONE(int8_t(*pSrc++)); |
187 |
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copysamples--; |
188 |
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} |
189 |
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break; |
190 |
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} |
191 |
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} |
192 |
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193 |
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const int bytesPerFrame[] = { 4096, 2052, 768, 524, 396, 268 }; |
194 |
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const int bytesPerFrameNoHdr[] = { 4096, 2048, 768, 512, 384, 256 }; |
195 |
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const int headerSize[] = { 0, 4, 0, 12, 12, 12 }; |
196 |
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const int bitsPerSample[] = { 16, 8, 24, 16, 12, 8 }; |
197 |
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} |
198 |
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199 |
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200 |
// *************** Sample *************** |
// *************** Sample *************** |
201 |
// * |
// * |
202 |
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|
203 |
unsigned int Sample::Instances = 0; |
unsigned int Sample::Instances = 0; |
204 |
void* Sample::pDecompressionBuffer = NULL; |
unsigned char* Sample::pDecompressionBuffer = NULL; |
205 |
unsigned long Sample::DecompressionBufferSize = 0; |
unsigned long Sample::DecompressionBufferSize = 0; |
206 |
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|
207 |
Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) { |
Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) { |
221 |
smpl->Read(&SMPTEFormat, 1, 4); |
smpl->Read(&SMPTEFormat, 1, 4); |
222 |
SMPTEOffset = smpl->ReadInt32(); |
SMPTEOffset = smpl->ReadInt32(); |
223 |
Loops = smpl->ReadInt32(); |
Loops = smpl->ReadInt32(); |
224 |
uint32_t manufByt = smpl->ReadInt32(); |
smpl->ReadInt32(); // manufByt |
225 |
LoopID = smpl->ReadInt32(); |
LoopID = smpl->ReadInt32(); |
226 |
smpl->Read(&LoopType, 1, 4); |
smpl->Read(&LoopType, 1, 4); |
227 |
LoopStart = smpl->ReadInt32(); |
LoopStart = smpl->ReadInt32(); |
235 |
RAMCache.pStart = NULL; |
RAMCache.pStart = NULL; |
236 |
RAMCache.NullExtensionSize = 0; |
RAMCache.NullExtensionSize = 0; |
237 |
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|
238 |
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if (BitDepth > 24) throw gig::Exception("Only samples up to 24 bit supported"); |
239 |
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|
240 |
Compressed = (waveList->GetSubChunk(CHUNK_ID_EWAV)); |
Compressed = (waveList->GetSubChunk(CHUNK_ID_EWAV)); |
241 |
if (Compressed) { |
if (Compressed) { |
242 |
ScanCompressedSample(); |
ScanCompressedSample(); |
243 |
} |
} |
244 |
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if (BitDepth > 24) throw gig::Exception("Only samples up to 24 bit supported"); |
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if (Compressed && Channels == 1) throw gig::Exception("Mono compressed samples not yet supported"); |
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if (Compressed && BitDepth == 24) throw gig::Exception("24 bit compressed samples not yet supported"); |
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|
245 |
// we use a buffer for decompression and for truncating 24 bit samples to 16 bit |
// we use a buffer for decompression and for truncating 24 bit samples to 16 bit |
246 |
if ((Compressed || BitDepth == 24) && !pDecompressionBuffer) { |
if ((Compressed || BitDepth == 24) && !pDecompressionBuffer) { |
247 |
pDecompressionBuffer = new int8_t[INITIAL_SAMPLE_BUFFER_SIZE]; |
pDecompressionBuffer = new unsigned char[INITIAL_SAMPLE_BUFFER_SIZE]; |
248 |
DecompressionBufferSize = INITIAL_SAMPLE_BUFFER_SIZE; |
DecompressionBufferSize = INITIAL_SAMPLE_BUFFER_SIZE; |
249 |
} |
} |
250 |
FrameOffset = 0; // just for streaming compressed samples |
FrameOffset = 0; // just for streaming compressed samples |
258 |
this->SamplesTotal = 0; |
this->SamplesTotal = 0; |
259 |
std::list<unsigned long> frameOffsets; |
std::list<unsigned long> frameOffsets; |
260 |
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261 |
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SamplesPerFrame = BitDepth == 24 ? 256 : 2048; |
262 |
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WorstCaseFrameSize = SamplesPerFrame * FrameSize + Channels; |
263 |
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|
264 |
// Scanning |
// Scanning |
265 |
pCkData->SetPos(0); |
pCkData->SetPos(0); |
266 |
while (pCkData->GetState() == RIFF::stream_ready) { |
if (Channels == 2) { // Stereo |
267 |
frameOffsets.push_back(pCkData->GetPos()); |
for (int i = 0 ; ; i++) { |
268 |
int16_t compressionmode = pCkData->ReadInt16(); |
// for 24 bit samples every 8:th frame offset is |
269 |
this->SamplesTotal += 2048; |
// stored, to save some memory |
270 |
switch (compressionmode) { |
if (BitDepth != 24 || (i & 7) == 0) frameOffsets.push_back(pCkData->GetPos()); |
271 |
case 1: // left channel compressed |
|
272 |
case 256: // right channel compressed |
const int mode_l = pCkData->ReadUint8(); |
273 |
pCkData->SetPos(6148, RIFF::stream_curpos); |
const int mode_r = pCkData->ReadUint8(); |
274 |
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if (mode_l > 5 || mode_r > 5) throw gig::Exception("Unknown compression mode"); |
275 |
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const unsigned long frameSize = bytesPerFrame[mode_l] + bytesPerFrame[mode_r]; |
276 |
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|
277 |
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if (pCkData->RemainingBytes() <= frameSize) { |
278 |
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SamplesInLastFrame = |
279 |
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((pCkData->RemainingBytes() - headerSize[mode_l] - headerSize[mode_r]) << 3) / |
280 |
|
(bitsPerSample[mode_l] + bitsPerSample[mode_r]); |
281 |
|
SamplesTotal += SamplesInLastFrame; |
282 |
break; |
break; |
283 |
case 257: // both channels compressed |
} |
284 |
pCkData->SetPos(4104, RIFF::stream_curpos); |
SamplesTotal += SamplesPerFrame; |
285 |
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pCkData->SetPos(frameSize, RIFF::stream_curpos); |
286 |
|
} |
287 |
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} |
288 |
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else { // Mono |
289 |
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for (int i = 0 ; ; i++) { |
290 |
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if (BitDepth != 24 || (i & 7) == 0) frameOffsets.push_back(pCkData->GetPos()); |
291 |
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|
292 |
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const int mode = pCkData->ReadUint8(); |
293 |
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if (mode > 5) throw gig::Exception("Unknown compression mode"); |
294 |
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const unsigned long frameSize = bytesPerFrame[mode]; |
295 |
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|
296 |
|
if (pCkData->RemainingBytes() <= frameSize) { |
297 |
|
SamplesInLastFrame = |
298 |
|
((pCkData->RemainingBytes() - headerSize[mode]) << 3) / bitsPerSample[mode]; |
299 |
|
SamplesTotal += SamplesInLastFrame; |
300 |
break; |
break; |
301 |
default: // both channels uncompressed |
} |
302 |
pCkData->SetPos(8192, RIFF::stream_curpos); |
SamplesTotal += SamplesPerFrame; |
303 |
|
pCkData->SetPos(frameSize, RIFF::stream_curpos); |
304 |
} |
} |
305 |
} |
} |
306 |
pCkData->SetPos(0); |
pCkData->SetPos(0); |
307 |
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//FIXME: only seen compressed samples with 16 bit stereo so far |
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this->FrameSize = 4; |
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this->BitDepth = 16; |
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|
308 |
// Build the frames table (which is used for fast resolving of a frame's chunk offset) |
// Build the frames table (which is used for fast resolving of a frame's chunk offset) |
309 |
if (FrameTable) delete[] FrameTable; |
if (FrameTable) delete[] FrameTable; |
310 |
FrameTable = new unsigned long[frameOffsets.size()]; |
FrameTable = new unsigned long[frameOffsets.size()]; |
704 |
if (!Compressed) { |
if (!Compressed) { |
705 |
if (BitDepth == 24) { |
if (BitDepth == 24) { |
706 |
// 24 bit sample. For now just truncate to 16 bit. |
// 24 bit sample. For now just truncate to 16 bit. |
707 |
int8_t* pSrc = (int8_t*)this->pDecompressionBuffer; |
unsigned char* pSrc = this->pDecompressionBuffer; |
708 |
int8_t* pDst = (int8_t*)pBuffer; |
int16_t* pDst = static_cast<int16_t*>(pBuffer); |
709 |
unsigned long n = pCkData->Read(pSrc, SampleCount, FrameSize); |
if (Channels == 2) { // Stereo |
710 |
for (int i = SampleCount * (FrameSize / 3) ; i > 0 ; i--) { |
unsigned long readBytes = pCkData->Read(pSrc, SampleCount * 6, 1); |
711 |
pSrc++; |
pSrc++; |
712 |
*pDst++ = *pSrc++; |
for (unsigned long i = readBytes ; i > 0 ; i -= 3) { |
713 |
*pDst++ = *pSrc++; |
*pDst++ = get16(pSrc); |
714 |
|
pSrc += 3; |
715 |
|
} |
716 |
|
return (pDst - static_cast<int16_t*>(pBuffer)) >> 1; |
717 |
|
} |
718 |
|
else { // Mono |
719 |
|
unsigned long readBytes = pCkData->Read(pSrc, SampleCount * 3, 1); |
720 |
|
pSrc++; |
721 |
|
for (unsigned long i = readBytes ; i > 0 ; i -= 3) { |
722 |
|
*pDst++ = get16(pSrc); |
723 |
|
pSrc += 3; |
724 |
|
} |
725 |
|
return pDst - static_cast<int16_t*>(pBuffer); |
726 |
} |
} |
727 |
return SampleCount; |
} |
728 |
} else { |
else { // 16 bit |
729 |
return pCkData->Read(pBuffer, SampleCount, FrameSize); //FIXME: channel inversion due to endian correction? |
// (pCkData->Read does endian correction) |
730 |
|
return Channels == 2 ? pCkData->Read(pBuffer, SampleCount << 1, 2) >> 1 |
731 |
|
: pCkData->Read(pBuffer, SampleCount, 2); |
732 |
} |
} |
733 |
} |
} |
734 |
else { //FIXME: no support for mono compressed samples yet, are there any? |
else { |
735 |
if (this->SamplePos >= this->SamplesTotal) return 0; |
if (this->SamplePos >= this->SamplesTotal) return 0; |
736 |
//TODO: efficiency: we simply assume here that all frames are compressed, maybe we should test for an average compression rate |
//TODO: efficiency: maybe we should test for an average compression rate |
737 |
// best case needed buffer size (all frames compressed) |
unsigned long assumedsize = GuessSize(SampleCount), |
|
unsigned long assumedsize = (SampleCount << 1) + // *2 (16 Bit, stereo, but assume all frames compressed) |
|
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(SampleCount >> 10) + // 10 bytes header per 2048 sample points |
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8194, // at least one worst case sample frame |
|
738 |
remainingbytes = 0, // remaining bytes in the local buffer |
remainingbytes = 0, // remaining bytes in the local buffer |
739 |
remainingsamples = SampleCount, |
remainingsamples = SampleCount, |
740 |
copysamples; |
copysamples, skipsamples, |
741 |
int currentframeoffset = this->FrameOffset; // offset in current sample frame since last Read() |
currentframeoffset = this->FrameOffset; // offset in current sample frame since last Read() |
742 |
this->FrameOffset = 0; |
this->FrameOffset = 0; |
743 |
|
|
744 |
if (assumedsize > this->DecompressionBufferSize) { |
if (assumedsize > this->DecompressionBufferSize) { |
745 |
// local buffer reallocation - hope this won't happen |
// local buffer reallocation - hope this won't happen |
746 |
if (this->pDecompressionBuffer) delete[] (int8_t*) this->pDecompressionBuffer; |
if (this->pDecompressionBuffer) delete[] this->pDecompressionBuffer; |
747 |
this->pDecompressionBuffer = new int8_t[assumedsize << 1]; // double of current needed size |
this->pDecompressionBuffer = new unsigned char[assumedsize << 1]; // double of current needed size |
748 |
this->DecompressionBufferSize = assumedsize << 1; |
this->DecompressionBufferSize = assumedsize << 1; |
749 |
} |
} |
750 |
|
|
751 |
int16_t compressionmode, left, dleft, right, dright; |
unsigned char* pSrc = this->pDecompressionBuffer; |
752 |
int8_t* pSrc = (int8_t*) this->pDecompressionBuffer; |
int16_t* pDst = static_cast<int16_t*>(pBuffer); |
|
int16_t* pDst = (int16_t*) pBuffer; |
|
753 |
remainingbytes = pCkData->Read(pSrc, assumedsize, 1); |
remainingbytes = pCkData->Read(pSrc, assumedsize, 1); |
754 |
|
|
755 |
while (remainingsamples) { |
while (remainingsamples && remainingbytes) { |
756 |
|
unsigned long framesamples = SamplesPerFrame; |
757 |
// reload from disk to local buffer if needed |
unsigned long framebytes, rightChannelOffset = 0, nextFrameOffset; |
758 |
if (remainingbytes < 8194) { |
|
759 |
if (pCkData->GetState() != RIFF::stream_ready) { |
int mode_l = *pSrc++, mode_r = 0; |
760 |
this->SamplePos = this->SamplesTotal; |
|
761 |
return (SampleCount - remainingsamples); |
if (Channels == 2) { |
762 |
|
mode_r = *pSrc++; |
763 |
|
framebytes = bytesPerFrame[mode_l] + bytesPerFrame[mode_r] + 2; |
764 |
|
rightChannelOffset = bytesPerFrameNoHdr[mode_l]; |
765 |
|
nextFrameOffset = rightChannelOffset + bytesPerFrameNoHdr[mode_r]; |
766 |
|
if (remainingbytes < framebytes) { // last frame in sample |
767 |
|
framesamples = SamplesInLastFrame; |
768 |
|
if (mode_l == 4 && (framesamples & 1)) { |
769 |
|
rightChannelOffset = ((framesamples + 1) * bitsPerSample[mode_l]) >> 3; |
770 |
|
} |
771 |
|
else { |
772 |
|
rightChannelOffset = (framesamples * bitsPerSample[mode_l]) >> 3; |
773 |
|
} |
774 |
|
} |
775 |
|
} |
776 |
|
else { |
777 |
|
framebytes = bytesPerFrame[mode_l] + 1; |
778 |
|
nextFrameOffset = bytesPerFrameNoHdr[mode_l]; |
779 |
|
if (remainingbytes < framebytes) { |
780 |
|
framesamples = SamplesInLastFrame; |
781 |
} |
} |
|
assumedsize = remainingsamples; |
|
|
assumedsize = (assumedsize << 1) + // *2 (16 Bit, stereo, but assume all frames compressed) |
|
|
(assumedsize >> 10) + // 10 bytes header per 2048 sample points |
|
|
8194; // at least one worst case sample frame |
|
|
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
|
|
if (pCkData->RemainingBytes() < assumedsize) assumedsize = pCkData->RemainingBytes(); |
|
|
remainingbytes = pCkData->Read(this->pDecompressionBuffer, assumedsize, 1); |
|
|
pSrc = (int8_t*) this->pDecompressionBuffer; |
|
782 |
} |
} |
783 |
|
|
784 |
// determine how many samples in this frame to skip and read |
// determine how many samples in this frame to skip and read |
785 |
if (remainingsamples >= 2048) { |
if (currentframeoffset + remainingsamples >= framesamples) { |
786 |
copysamples = 2048 - currentframeoffset; |
if (currentframeoffset <= framesamples) { |
787 |
remainingsamples -= copysamples; |
copysamples = framesamples - currentframeoffset; |
788 |
|
skipsamples = currentframeoffset; |
789 |
|
} |
790 |
|
else { |
791 |
|
copysamples = 0; |
792 |
|
skipsamples = framesamples; |
793 |
|
} |
794 |
} |
} |
795 |
else { |
else { |
796 |
|
// This frame has enough data for pBuffer, but not |
797 |
|
// all of the frame is needed. Set file position |
798 |
|
// to start of this frame for next call to Read. |
799 |
copysamples = remainingsamples; |
copysamples = remainingsamples; |
800 |
if (currentframeoffset + copysamples > 2048) { |
skipsamples = currentframeoffset; |
801 |
copysamples = 2048 - currentframeoffset; |
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
802 |
remainingsamples -= copysamples; |
this->FrameOffset = currentframeoffset + copysamples; |
803 |
} |
} |
804 |
else { |
remainingsamples -= copysamples; |
805 |
|
|
806 |
|
if (remainingbytes > framebytes) { |
807 |
|
remainingbytes -= framebytes; |
808 |
|
if (remainingsamples == 0 && |
809 |
|
currentframeoffset + copysamples == framesamples) { |
810 |
|
// This frame has enough data for pBuffer, and |
811 |
|
// all of the frame is needed. Set file |
812 |
|
// position to start of next frame for next |
813 |
|
// call to Read. FrameOffset is 0. |
814 |
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
|
remainingsamples = 0; |
|
|
this->FrameOffset = currentframeoffset + copysamples; |
|
815 |
} |
} |
816 |
} |
} |
817 |
|
else remainingbytes = 0; |
818 |
|
|
819 |
// decompress and copy current frame from local buffer to destination buffer |
currentframeoffset -= skipsamples; |
820 |
compressionmode = *(int16_t*)pSrc; pSrc+=2; |
|
821 |
switch (compressionmode) { |
if (copysamples == 0) { |
822 |
case 1: // left channel compressed |
// skip this frame |
823 |
remainingbytes -= 6150; // (left 8 bit, right 16 bit, +6 byte header) |
pSrc += framebytes - Channels; |
824 |
if (!remainingsamples && copysamples == 2048) |
} |
825 |
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
else { |
826 |
|
const unsigned char* const param_l = pSrc; |
827 |
left = *(int16_t*)pSrc; pSrc+=2; |
if (BitDepth == 24) { |
828 |
dleft = *(int16_t*)pSrc; pSrc+=2; |
if (mode_l != 2) pSrc += 12; |
829 |
while (currentframeoffset) { |
|
830 |
dleft -= *pSrc; |
if (Channels == 2) { // Stereo |
831 |
left -= dleft; |
const unsigned char* const param_r = pSrc; |
832 |
pSrc+=3; // 8 bit left channel, skip uncompressed right channel (16 bit) |
if (mode_r != 2) pSrc += 12; |
833 |
currentframeoffset--; |
|
834 |
} |
Decompress24(mode_l, param_l, pSrc, pDst, skipsamples, copysamples); |
835 |
while (copysamples) { |
Decompress24(mode_r, param_r, pSrc + rightChannelOffset, pDst + 1, |
836 |
dleft -= *pSrc; pSrc++; |
skipsamples, copysamples); |
837 |
left -= dleft; |
pDst += copysamples << 1; |
|
*pDst = left; pDst++; |
|
|
*pDst = *(int16_t*)pSrc; pDst++; pSrc+=2; |
|
|
copysamples--; |
|
|
} |
|
|
break; |
|
|
case 256: // right channel compressed |
|
|
remainingbytes -= 6150; // (left 16 bit, right 8 bit, +6 byte header) |
|
|
if (!remainingsamples && copysamples == 2048) |
|
|
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
|
|
|
|
|
right = *(int16_t*)pSrc; pSrc+=2; |
|
|
dright = *(int16_t*)pSrc; pSrc+=2; |
|
|
if (currentframeoffset) { |
|
|
pSrc+=2; // skip uncompressed left channel, now we can increment by 3 |
|
|
while (currentframeoffset) { |
|
|
dright -= *pSrc; |
|
|
right -= dright; |
|
|
pSrc+=3; // 8 bit right channel, skip uncompressed left channel (16 bit) |
|
|
currentframeoffset--; |
|
|
} |
|
|
pSrc-=2; // back aligned to left channel |
|
838 |
} |
} |
839 |
while (copysamples) { |
else { // Mono |
840 |
*pDst = *(int16_t*)pSrc; pDst++; pSrc+=2; |
Decompress24(mode_l, param_l, pSrc, pDst, skipsamples, copysamples); |
841 |
dright -= *pSrc; pSrc++; |
pDst += copysamples; |
|
right -= dright; |
|
|
*pDst = right; pDst++; |
|
|
copysamples--; |
|
842 |
} |
} |
843 |
break; |
} |
844 |
case 257: // both channels compressed |
else { // 16 bit |
845 |
remainingbytes -= 4106; // (left 8 bit, right 8 bit, +10 byte header) |
if (mode_l) pSrc += 4; |
846 |
if (!remainingsamples && copysamples == 2048) |
|
847 |
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
int step; |
848 |
|
if (Channels == 2) { // Stereo |
849 |
left = *(int16_t*)pSrc; pSrc+=2; |
const unsigned char* const param_r = pSrc; |
850 |
dleft = *(int16_t*)pSrc; pSrc+=2; |
if (mode_r) pSrc += 4; |
851 |
right = *(int16_t*)pSrc; pSrc+=2; |
|
852 |
dright = *(int16_t*)pSrc; pSrc+=2; |
step = (2 - mode_l) + (2 - mode_r); |
853 |
while (currentframeoffset) { |
Decompress16(mode_l, param_l, step, pSrc, pDst, skipsamples, copysamples); |
854 |
dleft -= *pSrc; pSrc++; |
Decompress16(mode_r, param_r, step, pSrc + (2 - mode_l), pDst + 1, |
855 |
left -= dleft; |
skipsamples, copysamples); |
856 |
dright -= *pSrc; pSrc++; |
pDst += copysamples << 1; |
|
right -= dright; |
|
|
currentframeoffset--; |
|
857 |
} |
} |
858 |
while (copysamples) { |
else { // Mono |
859 |
dleft -= *pSrc; pSrc++; |
step = 2 - mode_l; |
860 |
left -= dleft; |
Decompress16(mode_l, param_l, step, pSrc, pDst, skipsamples, copysamples); |
861 |
dright -= *pSrc; pSrc++; |
pDst += copysamples; |
|
right -= dright; |
|
|
*pDst = left; pDst++; |
|
|
*pDst = right; pDst++; |
|
|
copysamples--; |
|
862 |
} |
} |
863 |
break; |
} |
864 |
default: // both channels uncompressed |
pSrc += nextFrameOffset; |
|
remainingbytes -= 8194; // (left 16 bit, right 16 bit, +2 byte header) |
|
|
if (!remainingsamples && copysamples == 2048) |
|
|
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
|
|
|
|
|
pSrc += currentframeoffset << 2; |
|
|
currentframeoffset = 0; |
|
|
memcpy(pDst, pSrc, copysamples << 2); |
|
|
pDst += copysamples << 1; |
|
|
pSrc += copysamples << 2; |
|
|
break; |
|
865 |
} |
} |
866 |
} |
|
867 |
|
// reload from disk to local buffer if needed |
868 |
|
if (remainingsamples && remainingbytes < WorstCaseFrameSize && pCkData->GetState() == RIFF::stream_ready) { |
869 |
|
assumedsize = GuessSize(remainingsamples); |
870 |
|
pCkData->SetPos(remainingbytes, RIFF::stream_backward); |
871 |
|
if (pCkData->RemainingBytes() < assumedsize) assumedsize = pCkData->RemainingBytes(); |
872 |
|
remainingbytes = pCkData->Read(this->pDecompressionBuffer, assumedsize, 1); |
873 |
|
pSrc = this->pDecompressionBuffer; |
874 |
|
} |
875 |
|
} // while |
876 |
|
|
877 |
this->SamplePos += (SampleCount - remainingsamples); |
this->SamplePos += (SampleCount - remainingsamples); |
878 |
if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal; |
if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal; |
879 |
return (SampleCount - remainingsamples); |
return (SampleCount - remainingsamples); |
883 |
Sample::~Sample() { |
Sample::~Sample() { |
884 |
Instances--; |
Instances--; |
885 |
if (!Instances && pDecompressionBuffer) { |
if (!Instances && pDecompressionBuffer) { |
886 |
delete[] (int8_t*) pDecompressionBuffer; |
delete[] pDecompressionBuffer; |
887 |
pDecompressionBuffer = NULL; |
pDecompressionBuffer = NULL; |
888 |
} |
} |
889 |
if (FrameTable) delete[] FrameTable; |
if (FrameTable) delete[] FrameTable; |
1585 |
* @see GetFirstRegion() |
* @see GetFirstRegion() |
1586 |
*/ |
*/ |
1587 |
Region* Instrument::GetNextRegion() { |
Region* Instrument::GetNextRegion() { |
1588 |
if (RegionIndex < 0 || RegionIndex >= Regions) return NULL; |
if (RegionIndex < 0 || uint32_t(RegionIndex) >= Regions) return NULL; |
1589 |
return pRegions[RegionIndex++]; |
return pRegions[RegionIndex++]; |
1590 |
} |
} |
1591 |
|
|