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FFmpeg/libavcodec/mjpegenc.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which 
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

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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 FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavcodec/mjpegenc.c
* MJPEG encoder.
*/
//#define DEBUG
#include <assert.h>
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
/* use two quantizer tables (one for luminance and one for chrominance) */
/* not yet working */
#undef TWOMATRIXES
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,
ff_mjpeg_bits_dc_luminance,
ff_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance,
ff_mjpeg_bits_dc_chrominance,
ff_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
m->huff_code_ac_luminance,
ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
m->huff_code_ac_chrominance,
ff_mjpeg_bits_ac_chrominance,
ff_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(MpegEncContext *s, int table_class, int table_id,
const uint8_t *bits_table, const uint8_t *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, j, size;
uint8_t *ptr;
/* quant matrixes */
put_marker(p, DQT);
#ifdef TWOMATRIXES
put_bits(p, 16, 2 + 2 * (1 + 64));
#else
put_bits(p, 16, 2 + 1 * (1 + 64));
#endif
put_bits(p, 4, 0); /* 8 bit precision */
put_bits(p, 4, 0); /* table 0 */
for(i=0;i<64;i++) {
j = s->intra_scantable.permutated[i];
put_bits(p, 8, s->intra_matrix[j]);
}
#ifdef TWOMATRIXES
put_bits(p, 4, 0); /* 8 bit precision */
put_bits(p, 4, 1); /* table 1 */
for(i=0;i<64;i++) {
j = s->intra_scantable.permutated[i];
put_bits(p, 8, s->chroma_intra_matrix[j]);
}
#endif
/* 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(s, 0, 0, ff_mjpeg_bits_dc_luminance,
ff_mjpeg_val_dc);
size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
ff_mjpeg_val_dc);
size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance);
size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance,
ff_mjpeg_val_ac_chrominance);
AV_WB16(ptr, size);
}
static void jpeg_put_comments(MpegEncContext *s)
{
PutBitContext *p = &s->pb;
int size;
uint8_t *ptr;
if (s->aspect_ratio_info /* && !lossless */)
{
/* JFIF header */
put_marker(p, APP0);
put_bits(p, 16, 16);
ff_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, s->avctx->sample_aspect_ratio.num);
put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
put_bits(p, 8, 0); /* thumbnail width */
put_bits(p, 8, 0); /* thumbnail height */
}
/* comment */
if(!(s->flags & CODEC_FLAG_BITEXACT)){
put_marker(p, COM);
flush_put_bits(p);
ptr = put_bits_ptr(p);
put_bits(p, 16, 0); /* patched later */
ff_put_string(p, LIBAVCODEC_IDENT, 1);
size = strlen(LIBAVCODEC_IDENT)+3;
AV_WB16(ptr, size);
}
if( s->avctx->pix_fmt == PIX_FMT_YUV420P
||s->avctx->pix_fmt == PIX_FMT_YUV422P
||s->avctx->pix_fmt == PIX_FMT_YUV444P){
put_marker(p, COM);
flush_put_bits(p);
ptr = put_bits_ptr(p);
put_bits(p, 16, 0); /* patched later */
ff_put_string(p, "CS=ITU601", 1);
size = strlen("CS=ITU601")+3;
AV_WB16(ptr, size);
}
}
void ff_mjpeg_encode_picture_header(MpegEncContext *s)
{
const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
put_marker(&s->pb, SOI);
jpeg_put_comments(s);
jpeg_table_header(s);
switch(s->avctx->codec_id){
case CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
case CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
default: assert(0);
}
put_bits(&s->pb, 16, 17);
if(lossless && s->avctx->pix_fmt == PIX_FMT_BGRA)
put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
else
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, s->mjpeg_hsample[0]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* 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, s->mjpeg_hsample[1]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
#ifdef TWOMATRIXES
put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
#else
put_bits(&s->pb, 8, 0); /* select matrix */
#endif
/* Cr component */
put_bits(&s->pb, 8, 3); /* component number */
put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
#ifdef TWOMATRIXES
put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
#else
put_bits(&s->pb, 8, 0); /* select matrix */
#endif
/* 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, lossless ? 0 : 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, lossless ? 0 : 1); /* AC huffman table index */
put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
switch(s->avctx->codec_id){
case CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
case CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
default: assert(0);
}
put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
}
static void escape_FF(MpegEncContext *s, int start)
{
int size= put_bits_count(&s->pb) - start*8;
int i, ff_count;
uint8_t *buf= s->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(&s->pb);
skip_put_bytes(&s->pb, ff_count);
for(i=size-1; ff_count; i--){
int v= buf[i];
if(v==0xFF){
//printf("%d %d\n", i, ff_count);
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(MpegEncContext *s)
{
ff_mjpeg_encode_stuffing(&s->pb);
flush_put_bits(&s->pb);
assert((s->header_bits&7)==0);
escape_FF(s, s->header_bits>>3);
put_marker(&s->pb, EOI);
}
void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
uint8_t *huff_size, uint16_t *huff_code)
{
int mant, nbits;
if (val == 0) {
put_bits(&s->pb, huff_size[0], huff_code[0]);
} else {
mant = val;
if (val < 0) {
val = -val;
mant--;
}
nbits= av_log2_16bit(val) + 1;
put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
put_sbits(&s->pb, nbits, mant);
}
}
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_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, 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, 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, DCTELEM 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);
}
}
AVCodec mjpeg_encoder = {
"mjpeg",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_MJPEG,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
.pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
.long_name= NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
};
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