mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
318 lines
9.1 KiB
C
318 lines
9.1 KiB
C
/*
|
|
* lossless JPEG shared bits
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "libavutil/pixfmt.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "idctdsp.h"
|
|
#include "put_bits.h"
|
|
#include "mjpegenc_common.h"
|
|
#include "mjpeg.h"
|
|
|
|
/* table_class: 0 = DC coef, 1 = AC coefs */
|
|
static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
|
|
const uint8_t *bits_table, const uint8_t *value_table)
|
|
{
|
|
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(PutBitContext *p, ScanTable *intra_scantable,
|
|
uint16_t intra_matrix[64])
|
|
{
|
|
int i, j, size;
|
|
uint8_t *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++) {
|
|
j = intra_scantable->permutated[i];
|
|
put_bits(p, 8, intra_matrix[j]);
|
|
}
|
|
|
|
/* huffman table */
|
|
put_marker(p, DHT);
|
|
flush_put_bits(p);
|
|
ptr = put_bits_ptr(p);
|
|
put_bits(p, 16, 0); /* patched later */
|
|
size = 2;
|
|
size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
|
|
avpriv_mjpeg_val_dc);
|
|
size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
|
|
avpriv_mjpeg_val_dc);
|
|
|
|
size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
|
|
avpriv_mjpeg_val_ac_luminance);
|
|
size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
|
|
avpriv_mjpeg_val_ac_chrominance);
|
|
AV_WB16(ptr, size);
|
|
}
|
|
|
|
static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
|
|
{
|
|
int size;
|
|
uint8_t *ptr;
|
|
|
|
if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
|
|
/* JFIF header */
|
|
put_marker(p, APP0);
|
|
put_bits(p, 16, 16);
|
|
avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
|
|
put_bits(p, 16, 0x0201); /* v 1.02 */
|
|
put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
|
|
put_bits(p, 16, avctx->sample_aspect_ratio.num);
|
|
put_bits(p, 16, avctx->sample_aspect_ratio.den);
|
|
put_bits(p, 8, 0); /* thumbnail width */
|
|
put_bits(p, 8, 0); /* thumbnail height */
|
|
}
|
|
|
|
/* comment */
|
|
if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
|
|
put_marker(p, COM);
|
|
flush_put_bits(p);
|
|
ptr = put_bits_ptr(p);
|
|
put_bits(p, 16, 0); /* patched later */
|
|
avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
|
|
size = strlen(LIBAVCODEC_IDENT)+3;
|
|
AV_WB16(ptr, size);
|
|
}
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
|
|
avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
|
|
avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
|
|
put_marker(p, COM);
|
|
flush_put_bits(p);
|
|
ptr = put_bits_ptr(p);
|
|
put_bits(p, 16, 0); /* patched later */
|
|
avpriv_put_string(p, "CS=ITU601", 1);
|
|
size = strlen("CS=ITU601")+3;
|
|
AV_WB16(ptr, size);
|
|
}
|
|
}
|
|
|
|
void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
|
|
ScanTable *intra_scantable,
|
|
uint16_t intra_matrix[64])
|
|
{
|
|
int chroma_h_shift, chroma_v_shift;
|
|
const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG;
|
|
int hsample[3], vsample[3];
|
|
|
|
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
|
|
&chroma_v_shift);
|
|
|
|
if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
|
|
avctx->pix_fmt == AV_PIX_FMT_BGR24) {
|
|
vsample[0] = hsample[0] =
|
|
vsample[1] = hsample[1] =
|
|
vsample[2] = hsample[2] = 1;
|
|
} else {
|
|
vsample[0] = 2;
|
|
vsample[1] = 2 >> chroma_v_shift;
|
|
vsample[2] = 2 >> chroma_v_shift;
|
|
hsample[0] = 2;
|
|
hsample[1] = 2 >> chroma_h_shift;
|
|
hsample[2] = 2 >> chroma_h_shift;
|
|
}
|
|
|
|
put_marker(pb, SOI);
|
|
|
|
jpeg_put_comments(avctx, pb);
|
|
|
|
jpeg_table_header(pb, intra_scantable, intra_matrix);
|
|
|
|
switch (avctx->codec_id) {
|
|
case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break;
|
|
case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break;
|
|
default: assert(0);
|
|
}
|
|
|
|
put_bits(pb, 16, 17);
|
|
if (lossless && avctx->pix_fmt == AV_PIX_FMT_BGR24)
|
|
put_bits(pb, 8, 9); /* 9 bits/component RCT */
|
|
else
|
|
put_bits(pb, 8, 8); /* 8 bits/component */
|
|
put_bits(pb, 16, avctx->height);
|
|
put_bits(pb, 16, avctx->width);
|
|
put_bits(pb, 8, 3); /* 3 components */
|
|
|
|
/* Y component */
|
|
put_bits(pb, 8, 1); /* component number */
|
|
put_bits(pb, 4, hsample[0]); /* H factor */
|
|
put_bits(pb, 4, vsample[0]); /* V factor */
|
|
put_bits(pb, 8, 0); /* select matrix */
|
|
|
|
/* Cb component */
|
|
put_bits(pb, 8, 2); /* component number */
|
|
put_bits(pb, 4, hsample[1]); /* H factor */
|
|
put_bits(pb, 4, vsample[1]); /* V factor */
|
|
put_bits(pb, 8, 0); /* select matrix */
|
|
|
|
/* Cr component */
|
|
put_bits(pb, 8, 3); /* component number */
|
|
put_bits(pb, 4, hsample[2]); /* H factor */
|
|
put_bits(pb, 4, vsample[2]); /* V factor */
|
|
put_bits(pb, 8, 0); /* select matrix */
|
|
|
|
/* scan header */
|
|
put_marker(pb, SOS);
|
|
put_bits(pb, 16, 12); /* length */
|
|
put_bits(pb, 8, 3); /* 3 components */
|
|
|
|
/* Y component */
|
|
put_bits(pb, 8, 1); /* index */
|
|
put_bits(pb, 4, 0); /* DC huffman table index */
|
|
put_bits(pb, 4, 0); /* AC huffman table index */
|
|
|
|
/* Cb component */
|
|
put_bits(pb, 8, 2); /* index */
|
|
put_bits(pb, 4, 1); /* DC huffman table index */
|
|
put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
|
|
|
|
/* Cr component */
|
|
put_bits(pb, 8, 3); /* index */
|
|
put_bits(pb, 4, 1); /* DC huffman table index */
|
|
put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
|
|
|
|
put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */
|
|
|
|
switch (avctx->codec_id) {
|
|
case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
|
|
case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
|
|
default: assert(0);
|
|
}
|
|
|
|
put_bits(pb, 8, 0); /* Ah/Al (not used) */
|
|
}
|
|
|
|
static void escape_FF(PutBitContext *pb, int start)
|
|
{
|
|
int size = put_bits_count(pb) - start * 8;
|
|
int i, ff_count;
|
|
uint8_t *buf = pb->buf + start;
|
|
int align= (-(size_t)(buf))&3;
|
|
|
|
assert((size&7) == 0);
|
|
size >>= 3;
|
|
|
|
ff_count=0;
|
|
for(i=0; i<size && i<align; i++){
|
|
if(buf[i]==0xFF) ff_count++;
|
|
}
|
|
for(; i<size-15; i+=16){
|
|
int acc, v;
|
|
|
|
v= *(uint32_t*)(&buf[i]);
|
|
acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
|
v= *(uint32_t*)(&buf[i+4]);
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
|
v= *(uint32_t*)(&buf[i+8]);
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
|
v= *(uint32_t*)(&buf[i+12]);
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
|
|
|
acc>>=4;
|
|
acc+= (acc>>16);
|
|
acc+= (acc>>8);
|
|
ff_count+= acc&0xFF;
|
|
}
|
|
for(; i<size; i++){
|
|
if(buf[i]==0xFF) ff_count++;
|
|
}
|
|
|
|
if(ff_count==0) return;
|
|
|
|
flush_put_bits(pb);
|
|
skip_put_bytes(pb, ff_count);
|
|
|
|
for(i=size-1; ff_count; i--){
|
|
int v= buf[i];
|
|
|
|
if(v==0xFF){
|
|
buf[i+ff_count]= 0;
|
|
ff_count--;
|
|
}
|
|
|
|
buf[i+ff_count]= v;
|
|
}
|
|
}
|
|
|
|
void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
|
|
{
|
|
int length;
|
|
length= (-put_bits_count(pbc))&7;
|
|
if(length) put_bits(pbc, length, (1<<length)-1);
|
|
}
|
|
|
|
void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
|
|
{
|
|
ff_mjpeg_encode_stuffing(pb);
|
|
flush_put_bits(pb);
|
|
|
|
assert((header_bits & 7) == 0);
|
|
|
|
escape_FF(pb, header_bits >> 3);
|
|
|
|
put_marker(pb, EOI);
|
|
}
|
|
|
|
void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
|
|
uint8_t *huff_size, uint16_t *huff_code)
|
|
{
|
|
int mant, nbits;
|
|
|
|
if (val == 0) {
|
|
put_bits(pb, huff_size[0], huff_code[0]);
|
|
} else {
|
|
mant = val;
|
|
if (val < 0) {
|
|
val = -val;
|
|
mant--;
|
|
}
|
|
|
|
nbits= av_log2_16bit(val) + 1;
|
|
|
|
put_bits(pb, huff_size[nbits], huff_code[nbits]);
|
|
|
|
put_sbits(pb, nbits, mant);
|
|
}
|
|
}
|