1 files changed, 111 insertions, 0 deletions
diff --git a/gpr/source/lib/vc5_decoder/component.c b/gpr/source/lib/vc5_decoder/component.c
new file mode 100755
index 0000000..c224dc5
--- /dev/null
+++ b/gpr/source/lib/vc5_decoder/component.c
@@ -0,0 +1,111 @@
+/*! @file component.c
+ *
+ *  @brief Code for parsing the inverse component transform and inverse component permutation.
+ *
+ *  @version 1.0.0
+ *
+ *  (C) Copyright 2018 GoPro Inc (http://gopro.com/).
+ *
+ *  Licensed under either:
+ *  - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
+ *  - MIT license, http://opensource.org/licenses/MIT
+ *  at your option.
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "headers.h"
+
+CODEC_ERROR ParseInverseComponentTransform(DECODER *decoder, BITSTREAM *stream, size_t chunk_size)
+{
+    //CODEC_ERROR error = CODEC_ERROR_OKAY;
+    CODEC_STATE *codec = &decoder->codec;
+    int component_count = codec->channel_count;
+    int padding;
+    int i;
+    
+#if VC5_ENABLED_PART(VC5_PART_COLOR_SAMPLING)
+    if (IsPartEnabled(decoder->enabled_parts, VC5_PART_COLOR_SAMPLING))
+    {
+        // Recompute the number of components to account for color difference component subsampling
+        component_count = codec->pattern_width * codec->pattern_height + 2;
+    }
+#endif
+    
+    // Compute the padding (in bytes) from the end of the component transform to the end of the chunk payload
+    padding = (int)((chunk_size * sizeof(SEGMENT)) - ((component_count + 2) * component_count) * sizeof(uint8_t));
+    
+    for (i = 0; i < component_count; i++)
+    {
+        int offset;
+        int scale;
+        int j;
+        
+        for (j = 0; j < component_count; j++)
+        {
+            int matrix_index = i * component_count + j;
+            int matrix_value = GetBits(stream, 8);
+            
+            //TODO: Need to save the value in the codec state
+            (void)matrix_index;
+            (void)matrix_value;
+        }
+        
+        offset = GetBits(stream, 8);
+        scale = GetBits(stream, 8);
+        
+        //TODO: Need to save the offset and scale in the codec state
+        (void)offset;
+        (void)scale;
+    }
+    
+    // Skip the padding at the end of the chunk payload
+    GetBits(stream, 8 * padding);
+    
+    // Should be at the end of the last segment in the chunk
+    assert(IsAlignedSegment(stream));
+    
+    return CODEC_ERROR_OKAY;
+}
+
+CODEC_ERROR ParseInverseComponentPermutation(DECODER *decoder, BITSTREAM *stream, size_t chunk_size)
+{
+    //CODEC_ERROR error = CODEC_ERROR_OKAY;
+    CODEC_STATE *codec = &decoder->codec;
+    int component_count = codec->channel_count;
+    int padding;
+    int i;
+    
+#if VC5_ENABLED_PART(VC5_PART_COLOR_SAMPLING)
+    if (IsPartEnabled(decoder->enabled_parts, VC5_PART_COLOR_SAMPLING))
+    {
+        // Recompute the number of components to account for color difference component subsampling
+        component_count = codec->pattern_width * codec->pattern_height + 2;
+    }
+#endif
+    
+    // Compute the padding (in bytes) from the end of the component transform to the end of the chunk payload
+    padding = (int)((chunk_size * sizeof(SEGMENT)) - component_count * sizeof(uint8_t));
+    
+    for (i = 0; i < component_count; i++)
+    {
+        int value;
+        
+        value = GetBits(stream, 8);
+        
+        //TODO: Need to save the permutation index in yhe codec state
+        (void)value;
+    }
+    
+    // Skip the padding at the end of the chunk payload
+    GetBits(stream, 8 * padding);
+    
+    // Should be at the end of the last segment in the chunk
+    assert(IsAlignedSegment(stream));
+    
+    return CODEC_ERROR_OKAY;
+}