370 lines
12 KiB
C
370 lines
12 KiB
C
/*
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* lossless JPEG encoder
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2003 Alex Beregszaszi
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* Copyright (c) 2003-2004 Michael Niedermayer
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*
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* Support for external huffman table, various fixes (AVID workaround),
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* aspecting, new decode_frame mechanism and apple mjpeg-b support
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* by Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* lossless JPEG encoder.
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*/
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#include "libavutil/frame.h"
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#include "libavutil/mem.h"
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "jpegtables.h"
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#include "mjpegenc_common.h"
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#include "mjpeg.h"
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typedef struct LJpegEncContext {
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AVClass *class;
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IDCTDSPContext idsp;
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ScanTable scantable;
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uint16_t matrix[64];
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int vsample[4];
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int hsample[4];
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uint16_t huff_code_dc_luminance[12];
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uint16_t huff_code_dc_chrominance[12];
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uint8_t huff_size_dc_luminance[12];
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uint8_t huff_size_dc_chrominance[12];
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uint16_t (*scratch)[4];
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int pred;
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} LJpegEncContext;
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static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
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const AVFrame *frame)
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{
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LJpegEncContext *s = avctx->priv_data;
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const int width = frame->width;
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const int height = frame->height;
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const int linesize = frame->linesize[0];
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uint16_t (*buffer)[4] = s->scratch;
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int left[4], top[4], topleft[4];
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int x, y, i;
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#if FF_API_PRIVATE_OPT
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FF_DISABLE_DEPRECATION_WARNINGS
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if (avctx->prediction_method)
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s->pred = avctx->prediction_method + 1;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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for (i = 0; i < 4; i++)
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buffer[0][i] = 1 << (9 - 1);
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for (y = 0; y < height; y++) {
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const int modified_predictor = y ? s->pred : 1;
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uint8_t *ptr = frame->data[0] + (linesize * y);
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if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 4 * 4) {
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av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return -1;
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}
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for (i = 0; i < 4; i++)
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top[i]= left[i]= topleft[i]= buffer[0][i];
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for (x = 0; x < width; x++) {
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if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
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buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
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buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
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buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
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}else{
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buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
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buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
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buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
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if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
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buffer[x][3] = ptr[4 * x + 3];
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}
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for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
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int pred, diff;
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PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
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topleft[i] = top[i];
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top[i] = buffer[x+1][i];
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left[i] = buffer[x][i];
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diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
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if (i == 0 || i == 3)
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ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
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}
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}
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}
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return 0;
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}
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static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
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const AVFrame *frame, int predictor,
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int mb_x, int mb_y)
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{
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int i;
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if (mb_x == 0 || mb_y == 0) {
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for (i = 0; i < 3; i++) {
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uint8_t *ptr;
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int x, y, h, v, linesize;
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h = s->hsample[i];
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v = s->vsample[i];
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linesize = frame->linesize[i];
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for (y = 0; y < v; y++) {
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for (x = 0; x < h; x++) {
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int pred;
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ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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if (y == 0 && mb_y == 0) {
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if (x == 0 && mb_x == 0)
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pred = 128;
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else
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pred = ptr[-1];
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} else {
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if (x == 0 && mb_x == 0) {
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pred = ptr[-linesize];
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} else {
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PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
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ptr[-1], predictor);
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}
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}
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if (i == 0)
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ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
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}
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}
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}
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} else {
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for (i = 0; i < 3; i++) {
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uint8_t *ptr;
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int x, y, h, v, linesize;
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h = s->hsample[i];
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v = s->vsample[i];
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linesize = frame->linesize[i];
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for (y = 0; y < v; y++) {
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for (x = 0; x < h; x++) {
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int pred;
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ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
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if (i == 0)
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ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
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}
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}
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}
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}
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}
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static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
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const AVFrame *frame)
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{
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LJpegEncContext *s = avctx->priv_data;
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const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
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const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
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int mb_x, mb_y;
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#if FF_API_PRIVATE_OPT
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FF_DISABLE_DEPRECATION_WARNINGS
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if (avctx->prediction_method)
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s->pred = avctx->prediction_method + 1;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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for (mb_y = 0; mb_y < mb_height; mb_y++) {
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if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
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mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
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av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return -1;
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}
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for (mb_x = 0; mb_x < mb_width; mb_x++)
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ljpeg_encode_yuv_mb(s, pb, frame, s->pred, mb_x, mb_y);
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}
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return 0;
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}
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static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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LJpegEncContext *s = avctx->priv_data;
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PutBitContext pb;
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const int width = avctx->width;
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const int height = avctx->height;
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const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
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const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
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int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
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int ret, header_bits;
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if( avctx->pix_fmt == AV_PIX_FMT_BGR0
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|| avctx->pix_fmt == AV_PIX_FMT_BGR24)
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max_pkt_size += width * height * 3 * 4;
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else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
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max_pkt_size += width * height * 4 * 4;
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else {
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max_pkt_size += mb_width * mb_height * 3 * 4
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* s->hsample[0] * s->vsample[0];
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}
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if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
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return ret;
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init_put_bits(&pb, pkt->data, pkt->size);
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ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
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s->pred, s->matrix, s->matrix);
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header_bits = put_bits_count(&pb);
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if( avctx->pix_fmt == AV_PIX_FMT_BGR0
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|| avctx->pix_fmt == AV_PIX_FMT_BGRA
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|| avctx->pix_fmt == AV_PIX_FMT_BGR24)
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ret = ljpeg_encode_bgr(avctx, &pb, pict);
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else
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ret = ljpeg_encode_yuv(avctx, &pb, pict);
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if (ret < 0)
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return ret;
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emms_c();
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ff_mjpeg_escape_FF(&pb, header_bits >> 3);
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ff_mjpeg_encode_picture_trailer(&pb, header_bits);
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flush_put_bits(&pb);
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pkt->size = put_bits_ptr(&pb) - pb.buf;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
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{
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LJpegEncContext *s = avctx->priv_data;
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av_freep(&s->scratch);
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return 0;
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}
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static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
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{
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LJpegEncContext *s = avctx->priv_data;
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if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
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avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
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avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
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avctx->color_range == AVCOL_RANGE_MPEG) &&
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avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
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av_log(avctx, AV_LOG_ERROR,
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"Limited range YUV is non-standard, set strict_std_compliance to "
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"at least unofficial to use it.\n");
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return AVERROR(EINVAL);
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}
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#if FF_API_CODED_FRAME
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FF_DISABLE_DEPRECATION_WARNINGS
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avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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avctx->coded_frame->key_frame = 1;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
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if (!s->scratch)
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goto fail;
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ff_idctdsp_init(&s->idsp, avctx);
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ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
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ff_zigzag_direct);
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ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
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ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
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s->huff_code_dc_luminance,
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avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc);
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ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
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s->huff_code_dc_chrominance,
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avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc);
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return 0;
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fail:
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ljpeg_encode_close(avctx);
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return AVERROR(ENOMEM);
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}
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#define OFFSET(x) offsetof(LJpegEncContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
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{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
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{ "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
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{ "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
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{ NULL},
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};
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static const AVClass ljpeg_class = {
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.class_name = "ljpeg",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_ljpeg_encoder = {
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.name = "ljpeg",
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.long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_LJPEG,
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.priv_data_size = sizeof(LJpegEncContext),
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.priv_class = &ljpeg_class,
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.init = ljpeg_encode_init,
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.encode2 = ljpeg_encode_frame,
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.close = ljpeg_encode_close,
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.capabilities = AV_CODEC_CAP_FRAME_THREADS,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_NONE},
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};
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