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Diffstat (limited to 'apps/codecs/demac/libdemac/decoder.c')
-rw-r--r--apps/codecs/demac/libdemac/decoder.c45
1 files changed, 19 insertions, 26 deletions
diff --git a/apps/codecs/demac/libdemac/decoder.c b/apps/codecs/demac/libdemac/decoder.c
index 79b5255ce0..2200faf187 100644
--- a/apps/codecs/demac/libdemac/decoder.c
+++ b/apps/codecs/demac/libdemac/decoder.c
@@ -91,14 +91,14 @@ int ICODE_ATTR_DEMAC decode_chunk(struct ape_ctx_t* ape_ctx,
91#endif 91#endif
92 92
93 if ((ape_ctx->channels==1) || (ape_ctx->frameflags & APE_FRAMECODE_PSEUDO_STEREO)) { 93 if ((ape_ctx->channels==1) || (ape_ctx->frameflags & APE_FRAMECODE_PSEUDO_STEREO)) {
94 if (ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { 94 if (ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
95 entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, decoded0, decoded1, count); 95 entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, decoded0, decoded1, count);
96 /* We are pure silence, so we're done. */ 96 /* We are pure silence, so we're done. */
97 return 0; 97 return 0;
98 } else { 98 } else {
99 entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, decoded0, NULL, count); 99 entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, decoded0, NULL, count);
100 } 100 }
101 101
102 switch (ape_ctx->compressiontype) 102 switch (ape_ctx->compressiontype)
103 { 103 {
104 case 2000: 104 case 2000:
@@ -124,26 +124,23 @@ int ICODE_ATTR_DEMAC decode_chunk(struct ape_ctx_t* ape_ctx,
124 predictor_decode_mono(&ape_ctx->predictor,decoded0,count); 124 predictor_decode_mono(&ape_ctx->predictor,decoded0,count);
125 125
126 if (ape_ctx->channels==2) { 126 if (ape_ctx->channels==2) {
127 /* Pseudo-stereo - just copy left channel to right channel */ 127 /* Pseudo-stereo - copy left channel to right channel */
128 while (count--) 128 while (count--)
129 { 129 {
130 left = *decoded0; 130 left = *decoded0;
131 *(decoded1++) = *(decoded0++) = SCALE(left); 131 *(decoded1++) = *(decoded0++) = SCALE(left);
132 } 132 }
133 } else { 133 }
134 /* Mono - do nothing unless it's 8-bit audio */ 134#ifdef ROCKBOX
135 if (ape_ctx->bps == 8) { 135 else {
136 /* TODO: Handle 8-bit streams */ 136 /* Scale to output depth */
137 } else { 137 while (count--)
138 /* Scale to output depth */ 138 {
139 while (count--) 139 left = *decoded0;
140 { 140 *(decoded0++) = SCALE(left);
141 left = *decoded0;
142 *(decoded0++) = SCALE(left);
143 }
144 } 141 }
145
146 } 142 }
143#endif
147 } else { /* Stereo */ 144 } else { /* Stereo */
148 if (ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { 145 if (ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
149 /* We are pure silence, so we're done. */ 146 /* We are pure silence, so we're done. */
@@ -177,18 +174,14 @@ int ICODE_ATTR_DEMAC decode_chunk(struct ape_ctx_t* ape_ctx,
177 /* Now apply the predictor decoding */ 174 /* Now apply the predictor decoding */
178 predictor_decode_stereo(&ape_ctx->predictor,decoded0,decoded1,count); 175 predictor_decode_stereo(&ape_ctx->predictor,decoded0,decoded1,count);
179 176
180 if (ape_ctx->bps == 8) { 177 /* Decorrelate and scale to output depth */
181 /* TODO: Handle 8-bit streams */ 178 while (count--)
182 } else { 179 {
183 /* Decorrelate and scale to output depth */ 180 left = *decoded1 - (*decoded0 / 2);
184 while (count--) 181 right = left + *decoded0;
185 {
186 left = *decoded1 - (*decoded0 / 2);
187 right = left + *decoded0;
188 182
189 *(decoded0++) = SCALE(left); 183 *(decoded0++) = SCALE(left);
190 *(decoded1++) = SCALE(right); 184 *(decoded1++) = SCALE(right);
191 }
192 } 185 }
193 } 186 }
194 return 0; 187 return 0;