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ffmpeg/libavcodec/mjpegenc.c

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/*
* MJPEG encoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
*
* Support for external huffman table, various fixes (AVID workaround),
* aspecting, new decode_frame mechanism and apple mjpeg-b support
* by Alex Beregszaszi
*
* 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
*/
/**
* @file
* MJPEG encoder.
*/
#include <assert.h>
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
{
MJpegContext *m;
m = av_malloc(sizeof(MJpegContext));
if (!m)
return -1;
s->min_qcoeff=-1023;
s->max_qcoeff= 1023;
/* build all the huffman tables */
ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
m->huff_code_dc_luminance,
avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance,
avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
m->huff_code_ac_luminance,
avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
m->huff_code_ac_chrominance,
avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance);
s->mjpeg_ctx = m;
return 0;
}
void ff_mjpeg_encode_close(MpegEncContext *s)
{
av_free(s->mjpeg_ctx);
}
/* 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);
}
}
static void encode_block(MpegEncContext *s, int16_t *block, int n)
{
int mant, nbits, code, i, j;
int component, dc, run, last_index, val;
MJpegContext *m = s->mjpeg_ctx;
uint8_t *huff_size_ac;
uint16_t *huff_code_ac;
/* DC coef */
component = (n <= 3 ? 0 : (n&1) + 1);
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
if (n < 4) {
ff_mjpeg_encode_dc(&s->pb, 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 {
ff_mjpeg_encode_dc(&s->pb, 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 = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) {
run++;
} else {
while (run >= 16) {
put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
run -= 16;
}
mant = val;
if (val < 0) {
val = -val;
mant--;
}
nbits= av_log2(val) + 1;
code = (run << 4) | nbits;
put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
put_sbits(&s->pb, nbits, mant);
run = 0;
}
}
/* output EOB only if not already 64 values */
if (last_index < 63 || run != 0)
put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}
void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
{
int i;
for(i=0;i<5;i++) {
encode_block(s, block[i], i);
}
if (s->chroma_format == CHROMA_420) {
encode_block(s, block[5], 5);
} else {
encode_block(s, block[6], 6);
encode_block(s, block[5], 5);
encode_block(s, block[7], 7);
}
s->i_tex_bits += get_bits_diff(s);
}
AVCodec ff_mjpeg_encoder = {
.name = "mjpeg",
.long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MJPEG,
.priv_data_size = sizeof(MpegEncContext),
.init = ff_MPV_encode_init,
.encode2 = ff_MPV_encode_picture,
.close = ff_MPV_encode_end,
.pix_fmts = (const enum AVPixelFormat[]){
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE
},
};
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