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0cdbc4d393
FFmpeg/libavcodec/ljpegenc.c
Anton Khirnov 0cdbc4d393 ljpegenc: rename the encoding function. 
The new name is more consistent with the rest of Libav.
2013-12-05 13:37:32 +01:00

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/*
* lossless JPEG 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
* lossless JPEG encoder.
*/
#include "libavutil/frame.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "dsputil.h"
#include "internal.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
typedef struct LJpegEncContext {
DSPContext dsp;
ScanTable scantable;
uint16_t matrix[64];
int vsample[3];
int hsample[3];
uint16_t huff_code_dc_luminance[12];
uint16_t huff_code_dc_chrominance[12];
uint8_t huff_size_dc_luminance[12];
uint8_t huff_size_dc_chrominance[12];
uint16_t (*scratch)[4];
} LJpegEncContext;
static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
LJpegEncContext *s = avctx->priv_data;
PutBitContext pb;
const int width = avctx->width;
const int height = avctx->height;
const int predictor= avctx->prediction_method+1;
const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
int max_pkt_size = FF_MIN_BUFFER_SIZE;
int ret, header_bits;
if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
max_pkt_size += width * height * 3 * 4;
else {
max_pkt_size += mb_width * mb_height * 3 * 4
* s->hsample[0] * s->vsample[0];
}
if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
return ret;
}
init_put_bits(&pb, pkt->data, pkt->size);
ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
s->matrix);
header_bits = put_bits_count(&pb);
if(avctx->pix_fmt == AV_PIX_FMT_BGRA){
int x, y, i;
const int linesize = pict->linesize[0];
uint16_t (*buffer)[4] = s->scratch;
int left[3], top[3], topleft[3];
for(i=0; i<3; i++){
buffer[0][i]= 1 << (9 - 1);
}
for(y = 0; y < height; y++) {
const int modified_predictor= y ? predictor : 1;
uint8_t *ptr = pict->data[0] + (linesize * y);
if(pb.buf_end - pb.buf - (put_bits_count(&pb) >> 3) < width * 3 * 4) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for(i=0; i<3; i++){
top[i]= left[i]= topleft[i]= buffer[0][i];
}
for(x = 0; x < width; x++) {
buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
for(i=0;i<3;i++) {
int pred, diff;
PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
topleft[i]= top[i];
top[i]= buffer[x+1][i];
left[i]= buffer[x][i];
diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
if(i==0)
ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
}
}
}
}else{
int mb_x, mb_y, i;
for(mb_y = 0; mb_y < mb_height; mb_y++) {
if (pb.buf_end - pb.buf - (put_bits_count(&pb) >> 3) <
mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for(mb_x = 0; mb_x < mb_width; mb_x++) {
if(mb_x==0 || mb_y==0){
for(i=0;i<3;i++) {
uint8_t *ptr;
int x, y, h, v, linesize;
h = s->hsample[i];
v = s->vsample[i];
linesize = pict->linesize[i];
for(y=0; y<v; y++){
for(x=0; x<h; x++){
int pred;
ptr = pict->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
if(y==0 && mb_y==0){
if(x==0 && mb_x==0){
pred= 128;
}else{
pred= ptr[-1];
}
}else{
if(x==0 && mb_x==0){
pred= ptr[-linesize];
}else{
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
}
}
if(i==0)
ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
}
}
}
}else{
for(i=0;i<3;i++) {
uint8_t *ptr;
int x, y, h, v, linesize;
h = s->hsample[i];
v = s->vsample[i];
linesize = pict->linesize[i];
for(y=0; y<v; y++){
for(x=0; x<h; x++){
int pred;
ptr = pict->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
if(i==0)
ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
}
}
}
}
}
}
}
emms_c();
ff_mjpeg_encode_picture_trailer(&pb, header_bits);
flush_put_bits(&pb);
pkt->size = put_bits_ptr(&pb) - pb.buf;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
{
LJpegEncContext *s = avctx->priv_data;
av_frame_free(&avctx->coded_frame);
av_freep(&s->scratch);
return 0;
}
static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
{
LJpegEncContext *s = avctx->priv_data;
int chroma_v_shift, chroma_h_shift;
if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
avctx->pix_fmt == AV_PIX_FMT_YUV444P) &&
avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
av_log(avctx, AV_LOG_ERROR,
"Limited range YUV is non-standard, set strict_std_compliance to "
"at least unofficial to use it.\n");
return AVERROR(EINVAL);
}
avctx->coded_frame = av_frame_alloc();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1;
s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
ff_dsputil_init(&s->dsp, avctx);
ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
&chroma_v_shift);
if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
s->vsample[0] = s->hsample[0] =
s->vsample[1] = s->hsample[1] =
s->vsample[2] = s->hsample[2] = 1;
} else {
s->vsample[0] = 2;
s->vsample[1] = 2 >> chroma_v_shift;
s->vsample[2] = 2 >> chroma_v_shift;
s->hsample[0] = 2;
s->hsample[1] = 2 >> chroma_h_shift;
s->hsample[2] = 2 >> chroma_h_shift;
}
ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
s->huff_code_dc_luminance,
avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
s->huff_code_dc_chrominance,
avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc);
return 0;
}
AVCodec ff_ljpeg_encoder = {
.name = "ljpeg",
.long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_LJPEG,
.priv_data_size = sizeof(LJpegEncContext),
.init = ljpeg_encode_init,
.encode2 = ljpeg_encode_frame,
.close = ljpeg_encode_close,
.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_BGRA,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_NONE },
};
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