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ffmpeg/libavcodec/ljpegenc.c

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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 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
* lossless JPEG encoder.
*/
#include "libavutil/frame.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpegenc_common.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
typedef struct LJpegEncContext {
IDCTDSPContext idsp;
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_bgr(AVCodecContext *avctx, PutBitContext *pb,
const AVFrame *frame)
{
LJpegEncContext *s = avctx->priv_data;
const int width = frame->width;
const int height = frame->height;
const int linesize = frame->linesize[0];
uint16_t (*buffer)[4] = s->scratch;
const int predictor = avctx->prediction_method+1;
int left[3], top[3], topleft[3];
int x, y, i;
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 = frame->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++) {
if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
}else{
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);
}
}
}
return 0;
}
static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
const AVFrame *frame, int predictor,
int mb_x, int mb_y)
{
int i;
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 = frame->linesize[i];
for (y = 0; y < v; y++) {
for (x = 0; x < h; x++) {
int pred;
ptr = frame->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 = frame->linesize[i];
for (y = 0; y < v; y++) {
for (x = 0; x < h; x++) {
int pred;
ptr = frame->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);
}
}
}
}
}
static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
const AVFrame *frame)
{
const int predictor = avctx->prediction_method + 1;
LJpegEncContext *s = avctx->priv_data;
const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
int mb_x, mb_y;
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++)
ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
}
return 0;
}
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 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 = AV_INPUT_BUFFER_MIN_SIZE;
int ret, header_bits;
if( avctx->pix_fmt == AV_PIX_FMT_BGR0
|| avctx->pix_fmt == AV_PIX_FMT_BGRA
|| avctx->pix_fmt == AV_PIX_FMT_BGR24)
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_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
return ret;
init_put_bits(&pb, pkt->data, pkt->size);
ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
s->matrix, s->matrix);
header_bits = put_bits_count(&pb);
if( avctx->pix_fmt == AV_PIX_FMT_BGR0
|| avctx->pix_fmt == AV_PIX_FMT_BGRA
|| avctx->pix_fmt == AV_PIX_FMT_BGR24)
ret = ljpeg_encode_bgr(avctx, &pb, pict);
else
ret = ljpeg_encode_yuv(avctx, &pb, pict);
if (ret < 0)
return ret;
emms_c();
ff_mjpeg_escape_FF(&pb, header_bits >> 3);
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_freep(&s->scratch);
return 0;
}
static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
{
LJpegEncContext *s = avctx->priv_data;
if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
avctx->color_range == AVCOL_RANGE_MPEG) &&
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);
}
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
if (!s->scratch)
goto fail;
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
ff_zigzag_direct);
ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
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;
fail:
ljpeg_encode_close(avctx);
return AVERROR(ENOMEM);
}
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,
.capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
.pix_fmts = (const enum AVPixelFormat[]){
AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
AV_PIX_FMT_NONE},
};
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