diff options
Diffstat (limited to 'libav/mjpegenc.c')
| -rw-r--r-- | libav/mjpegenc.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/libav/mjpegenc.c b/libav/mjpegenc.c new file mode 100644 index 0000000000..027287528c --- /dev/null +++ b/libav/mjpegenc.c @@ -0,0 +1,416 @@ +/* + * MJPEG encoder + * Copyright (c) 2000 Gerard Lantau. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <stdlib.h> +#include <stdio.h> +#include "avcodec.h" +#include "mpegvideo.h" + +typedef struct MJpegContext { + UINT8 huff_size_dc_luminance[12]; + UINT16 huff_code_dc_luminance[12]; + UINT8 huff_size_dc_chrominance[12]; + UINT16 huff_code_dc_chrominance[12]; + + UINT8 huff_size_ac_luminance[256]; + UINT16 huff_code_ac_luminance[256]; + UINT8 huff_size_ac_chrominance[256]; + UINT16 huff_code_ac_chrominance[256]; +} MJpegContext; + +#define SOF0 0xc0 +#define SOI 0xd8 +#define EOI 0xd9 +#define DQT 0xdb +#define DHT 0xc4 +#define SOS 0xda + +#if 0 +/* These are the sample quantization tables given in JPEG spec section K.1. + * The spec says that the values given produce "good" quality, and + * when divided by 2, "very good" quality. + */ +static const unsigned char std_luminance_quant_tbl[64] = { + 16, 11, 10, 16, 24, 40, 51, 61, + 12, 12, 14, 19, 26, 58, 60, 55, + 14, 13, 16, 24, 40, 57, 69, 56, + 14, 17, 22, 29, 51, 87, 80, 62, + 18, 22, 37, 56, 68, 109, 103, 77, + 24, 35, 55, 64, 81, 104, 113, 92, + 49, 64, 78, 87, 103, 121, 120, 101, + 72, 92, 95, 98, 112, 100, 103, 99 +}; +static const unsigned char std_chrominance_quant_tbl[64] = { + 17, 18, 24, 47, 99, 99, 99, 99, + 18, 21, 26, 66, 99, 99, 99, 99, + 24, 26, 56, 99, 99, 99, 99, 99, + 47, 66, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99 +}; +#endif + +/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ +/* IMPORTANT: these are only valid for 8-bit data precision! */ +static const UINT8 bits_dc_luminance[17] = +{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; +static const UINT8 val_dc_luminance[] = +{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; + +static const UINT8 bits_dc_chrominance[17] = +{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; +static const UINT8 val_dc_chrominance[] = +{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; + +static const UINT8 bits_ac_luminance[17] = +{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; +static const UINT8 val_ac_luminance[] = +{ 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 +}; + +static const UINT8 bits_ac_chrominance[17] = +{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; + +static const UINT8 val_ac_chrominance[] = +{ 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 +}; + + +/* isn't this function nicer than the one in the libjpeg ? */ +static void build_huffman_codes(UINT8 *huff_size, UINT16 *huff_code, + const UINT8 *bits_table, const UINT8 *val_table) +{ + int i, j, k,nb, code, sym; + + code = 0; + k = 0; + for(i=1;i<=16;i++) { + nb = bits_table[i]; + for(j=0;j<nb;j++) { + sym = val_table[k++]; + huff_size[sym] = i; + huff_code[sym] = code; + code++; + } + code <<= 1; + } +} + +int mjpeg_init(MpegEncContext *s) +{ + MJpegContext *m; + + m = malloc(sizeof(MJpegContext)); + if (!m) + return -1; + + /* build all the huffman tables */ + build_huffman_codes(m->huff_size_dc_luminance, + m->huff_code_dc_luminance, + bits_dc_luminance, + val_dc_luminance); + build_huffman_codes(m->huff_size_dc_chrominance, + m->huff_code_dc_chrominance, + bits_dc_chrominance, + val_dc_chrominance); + build_huffman_codes(m->huff_size_ac_luminance, + m->huff_code_ac_luminance, + bits_ac_luminance, + val_ac_luminance); + build_huffman_codes(m->huff_size_ac_chrominance, + m->huff_code_ac_chrominance, + bits_ac_chrominance, + val_ac_chrominance); + + s->mjpeg_ctx = m; + return 0; +} + +void mjpeg_close(MpegEncContext *s) +{ + free(s->mjpeg_ctx); +} + +static inline void put_marker(PutBitContext *p, int code) +{ + put_bits(p, 8, 0xff); + put_bits(p, 8, code); +} + +/* table_class: 0 = DC coef, 1 = AC coefs */ +static int put_huffman_table(MpegEncContext *s, int table_class, int table_id, + const UINT8 *bits_table, const UINT8 *value_table) +{ + PutBitContext *p = &s->pb; + int n, i; + + put_bits(p, 4, table_class); + put_bits(p, 4, table_id); + + n = 0; + for(i=1;i<=16;i++) { + n += bits_table[i]; + put_bits(p, 8, bits_table[i]); + } + + for(i=0;i<n;i++) + put_bits(p, 8, value_table[i]); + + return n + 17; +} + +static void jpeg_table_header(MpegEncContext *s) +{ + PutBitContext *p = &s->pb; + int i, size; + UINT8 *ptr; + + /* quant matrixes */ + put_marker(p, DQT); + put_bits(p, 16, 2 + 1 * (1 + 64)); + put_bits(p, 4, 0); /* 8 bit precision */ + put_bits(p, 4, 0); /* table 0 */ + for(i=0;i<64;i++) { + put_bits(p, 8, s->init_intra_matrix[i]); + } +#if 0 + put_bits(p, 4, 0); /* 8 bit precision */ + put_bits(p, 4, 1); /* table 1 */ + for(i=0;i<64;i++) { + put_bits(p, 8, m->chrominance_matrix[i]); + } +#endif + + /* huffman table */ + put_marker(p, DHT); + flush_put_bits(p); + ptr = p->buf_ptr; + put_bits(p, 16, 0); /* patched later */ + size = 2; + size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance); + size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance); + + size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance); + size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance); + ptr[0] = size >> 8; + ptr[1] = size; +} + +void mjpeg_picture_header(MpegEncContext *s) +{ + put_marker(&s->pb, SOI); + + jpeg_table_header(s); + + put_marker(&s->pb, SOF0); + + put_bits(&s->pb, 16, 17); + put_bits(&s->pb, 8, 8); /* 8 bits/component */ + put_bits(&s->pb, 16, s->height); + put_bits(&s->pb, 16, s->width); + put_bits(&s->pb, 8, 3); /* 3 components */ + + /* Y component */ + put_bits(&s->pb, 8, 1); /* component number */ + put_bits(&s->pb, 4, 2); /* H factor */ + put_bits(&s->pb, 4, 2); /* V factor */ + put_bits(&s->pb, 8, 0); /* select matrix */ + + /* Cb component */ + put_bits(&s->pb, 8, 2); /* component number */ + put_bits(&s->pb, 4, 1); /* H factor */ + put_bits(&s->pb, 4, 1); /* V factor */ + put_bits(&s->pb, 8, 0); /* select matrix */ + + /* Cr component */ + put_bits(&s->pb, 8, 3); /* component number */ + put_bits(&s->pb, 4, 1); /* H factor */ + put_bits(&s->pb, 4, 1); /* V factor */ + put_bits(&s->pb, 8, 0); /* select matrix */ + + /* scan header */ + put_marker(&s->pb, SOS); + put_bits(&s->pb, 16, 12); /* length */ + put_bits(&s->pb, 8, 3); /* 3 components */ + + /* Y component */ + put_bits(&s->pb, 8, 1); /* index */ + put_bits(&s->pb, 4, 0); /* DC huffman table index */ + put_bits(&s->pb, 4, 0); /* AC huffman table index */ + + /* Cb component */ + put_bits(&s->pb, 8, 2); /* index */ + put_bits(&s->pb, 4, 1); /* DC huffman table index */ + put_bits(&s->pb, 4, 1); /* AC huffman table index */ + + /* Cr component */ + put_bits(&s->pb, 8, 3); /* index */ + put_bits(&s->pb, 4, 1); /* DC huffman table index */ + put_bits(&s->pb, 4, 1); /* AC huffman table index */ + + put_bits(&s->pb, 8, 0); /* Ss (not used) */ + put_bits(&s->pb, 8, 63); /* Se (not used) */ + put_bits(&s->pb, 8, 0); /* (not used) */ +} + +void mjpeg_picture_trailer(MpegEncContext *s) +{ + jflush_put_bits(&s->pb); + put_marker(&s->pb, EOI); +} + +static inline void encode_dc(MpegEncContext *s, int val, + UINT8 *huff_size, UINT16 *huff_code) +{ + int mant, nbits; + + if (val == 0) { + jput_bits(&s->pb, huff_size[0], huff_code[0]); + } else { + mant = val; + if (val < 0) { + val = -val; + mant--; + } + + /* compute the log (XXX: optimize) */ + nbits = 0; + while (val != 0) { + val = val >> 1; + nbits++; + } + + jput_bits(&s->pb, huff_size[nbits], huff_code[nbits]); + + jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1)); + } +} + +static void encode_block(MpegEncContext *s, DCTELEM *block, int n) +{ + int mant, nbits, code, i, j; + int component, dc, run, last_index, val; + MJpegContext *m = s->mjpeg_ctx; + UINT8 *huff_size_ac; + UINT16 *huff_code_ac; + + /* DC coef */ + component = (n <= 3 ? 0 : n - 4 + 1); + dc = block[0]; /* overflow is impossible */ + val = dc - s->last_dc[component]; + if (n < 4) { + encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance); + huff_size_ac = m->huff_size_ac_luminance; + huff_code_ac = m->huff_code_ac_luminance; + } else { + encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); + huff_size_ac = m->huff_size_ac_chrominance; + huff_code_ac = m->huff_code_ac_chrominance; + } + s->last_dc[component] = dc; + + /* AC coefs */ + + run = 0; + last_index = s->block_last_index[n]; + for(i=1;i<=last_index;i++) { + j = zigzag_direct[i]; + val = block[j]; + if (val == 0) { + run++; + } else { + while (run >= 16) { + jput_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]); + run -= 16; + } + mant = val; + if (val < 0) { + val = -val; + mant--; + } + + /* compute the log (XXX: optimize) */ + nbits = 0; + while (val != 0) { + val = val >> 1; + nbits++; + } + code = (run << 4) | nbits; + + jput_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]); + + jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1)); + run = 0; + } + } + + /* output EOB only if not already 64 values */ + if (last_index < 63 || run != 0) + jput_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]); +} + +void mjpeg_encode_mb(MpegEncContext *s, + DCTELEM block[6][64]) +{ + int i; + for(i=0;i<6;i++) { + encode_block(s, block[i], i); + } +} |