254 lines
7.4 KiB
C
Executable file
254 lines
7.4 KiB
C
Executable file
/*
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* Coda multi-standard codec IP - JPEG support functions
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*
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* Copyright (C) 2014 Philipp Zabel, Pengutronix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/swab.h>
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#include "coda.h"
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#include "trace.h"
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#define SOI_MARKER 0xffd8
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#define EOI_MARKER 0xffd9
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/*
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* Typical Huffman tables for 8-bit precision luminance and
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* chrominance from JPEG ITU-T.81 (ISO/IEC 10918-1) Annex K.3
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*/
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static const unsigned char luma_dc_bits[16] = {
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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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};
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static const unsigned char luma_dc_value[12] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b,
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};
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static const unsigned char chroma_dc_bits[16] = {
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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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};
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static const unsigned char chroma_dc_value[12] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b,
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};
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static const unsigned char luma_ac_bits[16] = {
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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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};
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static const unsigned char luma_ac_value[162 + 2] = {
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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, /* padded to 32-bit */
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};
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static const unsigned char chroma_ac_bits[16] = {
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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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};
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static const unsigned char chroma_ac_value[162 + 2] = {
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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, /* padded to 32-bit */
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};
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/*
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* Quantization tables for luminance and chrominance components in
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* zig-zag scan order from the Freescale i.MX VPU libaries
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*/
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static unsigned char luma_q[64] = {
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0x06, 0x04, 0x04, 0x04, 0x05, 0x04, 0x06, 0x05,
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0x05, 0x06, 0x09, 0x06, 0x05, 0x06, 0x09, 0x0b,
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0x08, 0x06, 0x06, 0x08, 0x0b, 0x0c, 0x0a, 0x0a,
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0x0b, 0x0a, 0x0a, 0x0c, 0x10, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x10, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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};
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static unsigned char chroma_q[64] = {
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0x07, 0x07, 0x07, 0x0d, 0x0c, 0x0d, 0x18, 0x10,
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0x10, 0x18, 0x14, 0x0e, 0x0e, 0x0e, 0x14, 0x14,
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0x0e, 0x0e, 0x0e, 0x0e, 0x14, 0x11, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x11, 0x11, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x11, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
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};
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struct coda_memcpy_desc {
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int offset;
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const void *src;
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size_t len;
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};
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static void coda_memcpy_parabuf(void *parabuf,
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const struct coda_memcpy_desc *desc)
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{
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u32 *dst = parabuf + desc->offset;
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const u32 *src = desc->src;
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int len = desc->len / 4;
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int i;
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for (i = 0; i < len; i += 2) {
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dst[i + 1] = swab32(src[i]);
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dst[i] = swab32(src[i + 1]);
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}
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}
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int coda_jpeg_write_tables(struct coda_ctx *ctx)
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{
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int i;
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static const struct coda_memcpy_desc huff[8] = {
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{ 0, luma_dc_bits, sizeof(luma_dc_bits) },
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{ 16, luma_dc_value, sizeof(luma_dc_value) },
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{ 32, luma_ac_bits, sizeof(luma_ac_bits) },
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{ 48, luma_ac_value, sizeof(luma_ac_value) },
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{ 216, chroma_dc_bits, sizeof(chroma_dc_bits) },
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{ 232, chroma_dc_value, sizeof(chroma_dc_value) },
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{ 248, chroma_ac_bits, sizeof(chroma_ac_bits) },
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{ 264, chroma_ac_value, sizeof(chroma_ac_value) },
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};
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struct coda_memcpy_desc qmat[3] = {
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{ 512, ctx->params.jpeg_qmat_tab[0], 64 },
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{ 576, ctx->params.jpeg_qmat_tab[1], 64 },
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{ 640, ctx->params.jpeg_qmat_tab[1], 64 },
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};
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/* Write huffman tables to parameter memory */
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for (i = 0; i < ARRAY_SIZE(huff); i++)
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coda_memcpy_parabuf(ctx->parabuf.vaddr, huff + i);
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/* Write Q-matrix to parameter memory */
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for (i = 0; i < ARRAY_SIZE(qmat); i++)
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coda_memcpy_parabuf(ctx->parabuf.vaddr, qmat + i);
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return 0;
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}
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bool coda_jpeg_check_buffer(struct coda_ctx *ctx, struct vb2_buffer *vb)
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{
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void *vaddr = vb2_plane_vaddr(vb, 0);
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u16 soi, eoi;
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int len, i;
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soi = be16_to_cpup((__be16 *)vaddr);
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if (soi != SOI_MARKER)
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return false;
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len = vb2_get_plane_payload(vb, 0);
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vaddr += len - 2;
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for (i = 0; i < 32; i++) {
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eoi = be16_to_cpup((__be16 *)(vaddr - i));
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if (eoi == EOI_MARKER) {
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if (i > 0)
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vb2_set_plane_payload(vb, 0, len - i);
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return true;
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}
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}
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return false;
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}
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/*
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* Scale quantization table using nonlinear scaling factor
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* u8 qtab[64], scale [50,190]
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*/
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static void coda_scale_quant_table(u8 *q_tab, int scale)
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{
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unsigned int temp;
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int i;
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for (i = 0; i < 64; i++) {
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temp = DIV_ROUND_CLOSEST((unsigned int)q_tab[i] * scale, 100);
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if (temp <= 0)
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temp = 1;
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if (temp > 255)
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temp = 255;
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q_tab[i] = (unsigned char)temp;
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}
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}
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void coda_set_jpeg_compression_quality(struct coda_ctx *ctx, int quality)
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{
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unsigned int scale;
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ctx->params.jpeg_quality = quality;
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/* Clip quality setting to [5,100] interval */
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if (quality > 100)
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quality = 100;
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if (quality < 5)
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quality = 5;
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/*
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* Non-linear scaling factor:
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* [5,50] -> [1000..100], [51,100] -> [98..0]
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*/
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if (quality < 50)
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scale = 5000 / quality;
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else
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scale = 200 - 2 * quality;
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if (ctx->params.jpeg_qmat_tab[0]) {
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memcpy(ctx->params.jpeg_qmat_tab[0], luma_q, 64);
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coda_scale_quant_table(ctx->params.jpeg_qmat_tab[0], scale);
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}
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if (ctx->params.jpeg_qmat_tab[1]) {
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memcpy(ctx->params.jpeg_qmat_tab[1], chroma_q, 64);
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coda_scale_quant_table(ctx->params.jpeg_qmat_tab[1], scale);
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}
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}
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