| /* |
| * Coda multi-standard codec IP - JPEG support functions |
| * |
| * Copyright (C) 2014 Philipp Zabel, Pengutronix |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/swab.h> |
| |
| #include "coda.h" |
| #include "trace.h" |
| |
| #define SOI_MARKER 0xffd8 |
| #define EOI_MARKER 0xffd9 |
| |
| /* |
| * Typical Huffman tables for 8-bit precision luminance and |
| * chrominance from JPEG ITU-T.81 (ISO/IEC 10918-1) Annex K.3 |
| */ |
| |
| static const unsigned char luma_dc_bits[16] = { |
| 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| }; |
| |
| static const unsigned char luma_dc_value[12] = { |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 0x08, 0x09, 0x0a, 0x0b, |
| }; |
| |
| static const unsigned char chroma_dc_bits[16] = { |
| 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, |
| }; |
| |
| static const unsigned char chroma_dc_value[12] = { |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 0x08, 0x09, 0x0a, 0x0b, |
| }; |
| |
| static const unsigned char luma_ac_bits[16] = { |
| 0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, |
| 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d, |
| }; |
| |
| static const unsigned char luma_ac_value[162 + 2] = { |
| 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
| 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
| 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
| 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
| 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
| 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
| 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
| 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
| 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
| 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
| 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
| 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
| 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
| 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
| 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
| 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
| 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
| 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
| 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
| 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 0xf9, 0xfa, /* padded to 32-bit */ |
| }; |
| |
| static const unsigned char chroma_ac_bits[16] = { |
| 0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, |
| 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, |
| }; |
| |
| static const unsigned char chroma_ac_value[162 + 2] = { |
| 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
| 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
| 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
| 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
| 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
| 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
| 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
| 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
| 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
| 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
| 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
| 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
| 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
| 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
| 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
| 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
| 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
| 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
| 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
| 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 0xf9, 0xfa, /* padded to 32-bit */ |
| }; |
| |
| /* |
| * Quantization tables for luminance and chrominance components in |
| * zig-zag scan order from the Freescale i.MX VPU libaries |
| */ |
| |
| static unsigned char luma_q[64] = { |
| 0x06, 0x04, 0x04, 0x04, 0x05, 0x04, 0x06, 0x05, |
| 0x05, 0x06, 0x09, 0x06, 0x05, 0x06, 0x09, 0x0b, |
| 0x08, 0x06, 0x06, 0x08, 0x0b, 0x0c, 0x0a, 0x0a, |
| 0x0b, 0x0a, 0x0a, 0x0c, 0x10, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x10, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| }; |
| |
| static unsigned char chroma_q[64] = { |
| 0x07, 0x07, 0x07, 0x0d, 0x0c, 0x0d, 0x18, 0x10, |
| 0x10, 0x18, 0x14, 0x0e, 0x0e, 0x0e, 0x14, 0x14, |
| 0x0e, 0x0e, 0x0e, 0x0e, 0x14, 0x11, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x11, 0x11, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x11, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, |
| }; |
| |
| struct coda_memcpy_desc { |
| int offset; |
| const void *src; |
| size_t len; |
| }; |
| |
| static void coda_memcpy_parabuf(void *parabuf, |
| const struct coda_memcpy_desc *desc) |
| { |
| u32 *dst = parabuf + desc->offset; |
| const u32 *src = desc->src; |
| int len = desc->len / 4; |
| int i; |
| |
| for (i = 0; i < len; i += 2) { |
| dst[i + 1] = swab32(src[i]); |
| dst[i] = swab32(src[i + 1]); |
| } |
| } |
| |
| int coda_jpeg_write_tables(struct coda_ctx *ctx) |
| { |
| int i; |
| static const struct coda_memcpy_desc huff[8] = { |
| { 0, luma_dc_bits, sizeof(luma_dc_bits) }, |
| { 16, luma_dc_value, sizeof(luma_dc_value) }, |
| { 32, luma_ac_bits, sizeof(luma_ac_bits) }, |
| { 48, luma_ac_value, sizeof(luma_ac_value) }, |
| { 216, chroma_dc_bits, sizeof(chroma_dc_bits) }, |
| { 232, chroma_dc_value, sizeof(chroma_dc_value) }, |
| { 248, chroma_ac_bits, sizeof(chroma_ac_bits) }, |
| { 264, chroma_ac_value, sizeof(chroma_ac_value) }, |
| }; |
| struct coda_memcpy_desc qmat[3] = { |
| { 512, ctx->params.jpeg_qmat_tab[0], 64 }, |
| { 576, ctx->params.jpeg_qmat_tab[1], 64 }, |
| { 640, ctx->params.jpeg_qmat_tab[1], 64 }, |
| }; |
| |
| /* Write huffman tables to parameter memory */ |
| for (i = 0; i < ARRAY_SIZE(huff); i++) |
| coda_memcpy_parabuf(ctx->parabuf.vaddr, huff + i); |
| |
| /* Write Q-matrix to parameter memory */ |
| for (i = 0; i < ARRAY_SIZE(qmat); i++) |
| coda_memcpy_parabuf(ctx->parabuf.vaddr, qmat + i); |
| |
| return 0; |
| } |
| |
| bool coda_jpeg_check_buffer(struct coda_ctx *ctx, struct vb2_buffer *vb) |
| { |
| void *vaddr = vb2_plane_vaddr(vb, 0); |
| u16 soi, eoi; |
| int len, i; |
| |
| soi = be16_to_cpup((__be16 *)vaddr); |
| if (soi != SOI_MARKER) |
| return false; |
| |
| len = vb2_get_plane_payload(vb, 0); |
| vaddr += len - 2; |
| for (i = 0; i < 32; i++) { |
| eoi = be16_to_cpup((__be16 *)(vaddr - i)); |
| if (eoi == EOI_MARKER) { |
| if (i > 0) |
| vb2_set_plane_payload(vb, 0, len - i); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /* |
| * Scale quantization table using nonlinear scaling factor |
| * u8 qtab[64], scale [50,190] |
| */ |
| static void coda_scale_quant_table(u8 *q_tab, int scale) |
| { |
| unsigned int temp; |
| int i; |
| |
| for (i = 0; i < 64; i++) { |
| temp = DIV_ROUND_CLOSEST((unsigned int)q_tab[i] * scale, 100); |
| if (temp <= 0) |
| temp = 1; |
| if (temp > 255) |
| temp = 255; |
| q_tab[i] = (unsigned char)temp; |
| } |
| } |
| |
| void coda_set_jpeg_compression_quality(struct coda_ctx *ctx, int quality) |
| { |
| unsigned int scale; |
| |
| ctx->params.jpeg_quality = quality; |
| |
| /* Clip quality setting to [5,100] interval */ |
| if (quality > 100) |
| quality = 100; |
| if (quality < 5) |
| quality = 5; |
| |
| /* |
| * Non-linear scaling factor: |
| * [5,50] -> [1000..100], [51,100] -> [98..0] |
| */ |
| if (quality < 50) |
| scale = 5000 / quality; |
| else |
| scale = 200 - 2 * quality; |
| |
| if (ctx->params.jpeg_qmat_tab[0]) { |
| memcpy(ctx->params.jpeg_qmat_tab[0], luma_q, 64); |
| coda_scale_quant_table(ctx->params.jpeg_qmat_tab[0], scale); |
| } |
| if (ctx->params.jpeg_qmat_tab[1]) { |
| memcpy(ctx->params.jpeg_qmat_tab[1], chroma_q, 64); |
| coda_scale_quant_table(ctx->params.jpeg_qmat_tab[1], scale); |
| } |
| } |
