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jpeg: compute default Huffman tables.
... instead of having them pre-calculated. This saves around 1.5 KB of data in the DSO but requires gst_jpeg_get_default_huffman_tables() to do more work. Though, the client application may have to call that function at most once, only.
This commit is contained in:
Gwenole Beauchesne
parent
71e4936e5e
commit
f88323857d
1 changed files with 140 additions and 106 deletions
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@ -120,112 +120,88 @@ static const GstJpegQuantTables default_quant_tables_zigzag = {
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};
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/* *INDENT-ON* */
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/* Table K.3: typical Huffman tables for 8-bit precision luminance and chrominance */
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typedef struct _GstJpegHuffmanTableEntry GstJpegHuffmanTableEntry;
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struct _GstJpegHuffmanTableEntry
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{
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guint8 value; /* category */
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guint8 length; /* code length in bits */
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};
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/* Table K.3 - Table for luminance DC coefficient differences */
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static const GstJpegHuffmanTableEntry default_luminance_dc_table[] = {
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{0x00, 2}, {0x01, 3}, {0x02, 3}, {0x03, 3}, {0x04, 3}, {0x05, 3},
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{0x06, 4}, {0x07, 5}, {0x08, 6}, {0x09, 7}, {0x0a, 8}, {0x0b, 9}
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};
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/* Table K.4 - Table for chrominance DC coefficient differences */
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static const GstJpegHuffmanTableEntry default_chrominance_dc_table[] = {
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{0x00, 2}, {0x01, 2}, {0x02, 2}, {0x03, 3}, {0x04, 4}, {0x05, 5},
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{0x06, 6}, {0x07, 7}, {0x08, 8}, {0x09, 9}, {0x0a, 10}, {0x0b, 11}
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};
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/* Table K.5 - Table for luminance AC coefficients */
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/* *INDENT-OFF* */
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static const GstJpegHuffmanTables default_huf_tables = {
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.dc_tables = {
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/* DC luma */
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{{0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b},
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TRUE},
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/* DC chroma */
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{{0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00},
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b},
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TRUE},
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/* DC chroma */
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{{0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00},
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b},
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TRUE},
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{{0x0,},
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{0x0,}
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}
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},
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.ac_tables = {
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/* AC luma */
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{{0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
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0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d},
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{0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa},
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TRUE},
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/* AC chroma */
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{{0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,
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0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77},
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{0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa},
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TRUE},
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/* AC chroma */
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{{0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,
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0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77},
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{0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa},
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TRUE},
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{{0x00,},
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{0x00,}
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}
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}
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static const GstJpegHuffmanTableEntry default_luminance_ac_table[] = {
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{0x00, 4}, {0x01, 2}, {0x02, 2}, {0x03, 3}, {0x04, 4}, {0x05, 5},
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{0x06, 7}, {0x07, 8}, {0x08, 10}, {0x09, 16}, {0x0a, 16}, {0x11, 4},
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{0x12, 5}, {0x13, 7}, {0x14, 9}, {0x15, 11}, {0x16, 16}, {0x17, 16},
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{0x18, 16}, {0x19, 16}, {0x1a, 16}, {0x21, 5}, {0x22, 8}, {0x23, 10},
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{0x24, 12}, {0x25, 16}, {0x26, 16}, {0x27, 16}, {0x28, 16}, {0x29, 16},
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{0x2a, 16}, {0x31, 6}, {0x32, 9}, {0x33, 12}, {0x34, 16}, {0x35, 16},
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{0x36, 16}, {0x37, 16}, {0x38, 16}, {0x39, 16}, {0x3a, 16}, {0x41, 6},
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{0x42, 10}, {0x43, 16}, {0x44, 16}, {0x45, 16}, {0x46, 16}, {0x47, 16},
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{0x48, 16}, {0x49, 16}, {0x4a, 16}, {0x51, 7}, {0x52, 11}, {0x53, 16},
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{0x54, 16}, {0x55, 16}, {0x56, 16}, {0x57, 16}, {0x58, 16}, {0x59, 16},
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{0x5a, 16}, {0x61, 7}, {0x62, 12}, {0x63, 16}, {0x64, 16}, {0x65, 16},
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{0x66, 16}, {0x67, 16}, {0x68, 16}, {0x69, 16}, {0x6a, 16}, {0x71, 8},
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{0x72, 12}, {0x73, 16}, {0x74, 16}, {0x75, 16}, {0x76, 16}, {0x77, 16},
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{0x78, 16}, {0x79, 16}, {0x7a, 16}, {0x81, 9}, {0x82, 15}, {0x83, 16},
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{0x84, 16}, {0x85, 16}, {0x86, 16}, {0x87, 16}, {0x88, 16}, {0x89, 16},
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{0x8a, 16}, {0x91, 9}, {0x92, 16}, {0x93, 16}, {0x94, 16}, {0x95, 16},
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{0x96, 16}, {0x97, 16}, {0x98, 16}, {0x99, 16}, {0x9a, 16}, {0xa1, 9},
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{0xa2, 16}, {0xa3, 16}, {0xa4, 16}, {0xa5, 16}, {0xa6, 16}, {0xa7, 16},
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{0xa8, 16}, {0xa9, 16}, {0xaa, 16}, {0xb1, 10}, {0xb2, 16}, {0xb3, 16},
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{0xb4, 16}, {0xb5, 16}, {0xb6, 16}, {0xb7, 16}, {0xb8, 16}, {0xb9, 16},
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{0xba, 16}, {0xc1, 10}, {0xc2, 16}, {0xc3, 16}, {0xc4, 16}, {0xc5, 16},
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{0xc6, 16}, {0xc7, 16}, {0xc8, 16}, {0xc9, 16}, {0xca, 16}, {0xd1, 11},
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{0xd2, 16}, {0xd3, 16}, {0xd4, 16}, {0xd5, 16}, {0xd6, 16}, {0xd7, 16},
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{0xd8, 16}, {0xd9, 16}, {0xda, 16}, {0xe1, 16}, {0xe2, 16}, {0xe3, 16},
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{0xe4, 16}, {0xe5, 16}, {0xe6, 16}, {0xe7, 16}, {0xe8, 16}, {0xe9, 16},
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{0xea, 16}, {0xf0, 11}, {0xf1, 16}, {0xf2, 16}, {0xf3, 16}, {0xf4, 16},
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{0xf5, 16}, {0xf6, 16}, {0xf7, 16}, {0xf8, 16}, {0xf9, 16}, {0xfa, 16}
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};
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/* *INDENT-ON* */
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/* Table K.6 - Table for chrominance AC coefficients */
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/* *INDENT-OFF* */
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static const GstJpegHuffmanTableEntry default_chrominance_ac_table[] = {
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{0x00, 2}, {0x01, 2}, {0x02, 3}, {0x03, 4}, {0x04, 5}, {0x05, 5},
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{0x06, 6}, {0x07, 7}, {0x08, 9}, {0x09, 10}, {0x0a, 12}, {0x11, 4},
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{0x12, 6}, {0x13, 8}, {0x14, 9}, {0x15, 11}, {0x16, 12}, {0x17, 16},
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{0x18, 16}, {0x19, 16}, {0x1a, 16}, {0x21, 5}, {0x22, 8}, {0x23, 10},
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{0x24, 12}, {0x25, 15}, {0x26, 16}, {0x27, 16}, {0x28, 16}, {0x29, 16},
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{0x2a, 16}, {0x31, 5}, {0x32, 8}, {0x33, 10}, {0x34, 12}, {0x35, 16},
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{0x36, 16}, {0x37, 16}, {0x38, 16}, {0x39, 16}, {0x3a, 16}, {0x41, 6},
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{0x42, 9}, {0x43, 16}, {0x44, 16}, {0x45, 16}, {0x46, 16}, {0x47, 16},
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{0x48, 16}, {0x49, 16}, {0x4a, 16}, {0x51, 6}, {0x52, 10}, {0x53, 16},
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{0x54, 16}, {0x55, 16}, {0x56, 16}, {0x57, 16}, {0x58, 16}, {0x59, 16},
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{0x5a, 16}, {0x61, 7}, {0x62, 11}, {0x63, 16}, {0x64, 16}, {0x65, 16},
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{0x66, 16}, {0x67, 16}, {0x68, 16}, {0x69, 16}, {0x6a, 16}, {0x71, 7},
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{0x72, 11}, {0x73, 16}, {0x74, 16}, {0x75, 16}, {0x76, 16}, {0x77, 16},
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{0x78, 16}, {0x79, 16}, {0x7a, 16}, {0x81, 8}, {0x82, 16}, {0x83, 16},
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{0x84, 16}, {0x85, 16}, {0x86, 16}, {0x87, 16}, {0x88, 16}, {0x89, 16},
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{0x8a, 16}, {0x91, 9}, {0x92, 16}, {0x93, 16}, {0x94, 16}, {0x95, 16},
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{0x96, 16}, {0x97, 16}, {0x98, 16}, {0x99, 16}, {0x9a, 16}, {0xa1, 9},
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{0xa2, 16}, {0xa3, 16}, {0xa4, 16}, {0xa5, 16}, {0xa6, 16}, {0xa7, 16},
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{0xa8, 16}, {0xa9, 16}, {0xaa, 16}, {0xb1, 9}, {0xb2, 16}, {0xb3, 16},
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{0xb4, 16}, {0xb5, 16}, {0xb6, 16}, {0xb7, 16}, {0xb8, 16}, {0xb9, 16},
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{0xba, 16}, {0xc1, 9}, {0xc2, 16}, {0xc3, 16}, {0xc4, 16}, {0xc5, 16},
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{0xc6, 16}, {0xc7, 16}, {0xc8, 16}, {0xc9, 16}, {0xca, 16}, {0xd1, 11},
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{0xd2, 16}, {0xd3, 16}, {0xd4, 16}, {0xd5, 16}, {0xd6, 16}, {0xd7, 16},
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{0xd8, 16}, {0xd9, 16}, {0xda, 16}, {0xe1, 14}, {0xe2, 16}, {0xe3, 16},
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{0xe4, 16}, {0xe5, 16}, {0xe6, 16}, {0xe7, 16}, {0xe8, 16}, {0xe9, 16},
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{0xea, 16}, {0xf0, 10}, {0xf1, 15}, {0xf2, 16}, {0xf3, 16}, {0xf4, 16},
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{0xf5, 16}, {0xf6, 16}, {0xf7, 16}, {0xf8, 16}, {0xf9, 16}, {0xfa, 16}
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};
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/* *INDENT-ON* */
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@ -463,12 +439,70 @@ gst_jpeg_parse_restart_interval (guint * interval,
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return TRUE;
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}
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static int
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compare_huffman_table_entry (const void *a, const void *b)
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{
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const GstJpegHuffmanTableEntry *const e1 = *(GstJpegHuffmanTableEntry **) a;
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const GstJpegHuffmanTableEntry *const e2 = *(GstJpegHuffmanTableEntry **) b;
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if (e1->length == e2->length)
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return (gint) e1->value - (gint) e2->value;
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return (gint) e1->length - (gint) e2->length;
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}
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static void
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build_huffman_table (GstJpegHuffmanTable * huf_table,
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const GstJpegHuffmanTableEntry * entries, guint num_entries)
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{
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const GstJpegHuffmanTableEntry *sorted_entries[256];
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guint i, j, n;
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g_assert (num_entries <= G_N_ELEMENTS (sorted_entries));
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for (i = 0; i < num_entries; i++)
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sorted_entries[i] = &entries[i];
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qsort (sorted_entries, num_entries, sizeof (sorted_entries[0]),
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compare_huffman_table_entry);
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for (i = 0, j = 1, n = 0; i < num_entries; i++) {
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const GstJpegHuffmanTableEntry *const e = sorted_entries[i];
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if (e->length != j) {
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huf_table->huf_bits[j++ - 1] = n;
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for (; j < e->length; j++)
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huf_table->huf_bits[j - 1] = 0;
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n = 0;
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}
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huf_table->huf_values[i] = e->value;
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n++;
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}
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for (; j < G_N_ELEMENTS (huf_table->huf_bits); j++)
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huf_table->huf_bits[j] = 0;
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for (; i < G_N_ELEMENTS (huf_table->huf_values); i++)
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huf_table->huf_values[i] = 0;
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huf_table->valid = TRUE;
|
||||
}
|
||||
|
||||
void
|
||||
gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huf_tables)
|
||||
{
|
||||
g_assert (huf_tables);
|
||||
|
||||
memcpy (huf_tables, &default_huf_tables, sizeof (*huf_tables));
|
||||
/* Build DC tables */
|
||||
build_huffman_table (&huf_tables->dc_tables[0], default_luminance_dc_table,
|
||||
G_N_ELEMENTS (default_luminance_dc_table));
|
||||
build_huffman_table (&huf_tables->dc_tables[1], default_chrominance_dc_table,
|
||||
G_N_ELEMENTS (default_chrominance_dc_table));
|
||||
memcpy (&huf_tables->dc_tables[2], &huf_tables->dc_tables[1],
|
||||
sizeof (huf_tables->dc_tables[2]));
|
||||
|
||||
/* Build AC tables */
|
||||
build_huffman_table (&huf_tables->ac_tables[0], default_luminance_ac_table,
|
||||
G_N_ELEMENTS (default_luminance_ac_table));
|
||||
build_huffman_table (&huf_tables->ac_tables[1], default_chrominance_ac_table,
|
||||
G_N_ELEMENTS (default_chrominance_ac_table));
|
||||
memcpy (&huf_tables->ac_tables[2], &huf_tables->ac_tables[1],
|
||||
sizeof (huf_tables->ac_tables[2]));
|
||||
}
|
||||
|
||||
void
|
||||
|
|
|
|||
Loading…
Reference in a new issue