GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/ljpegenc.c Lines: 92 140 65.7 %
Date: 2021-04-20 15:25:36 Branches: 50 110 45.5 %

Line Branch Exec Source
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/*
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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.
31
 */
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#include "libavutil/frame.h"
34
#include "libavutil/mem.h"
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#include "libavutil/opt.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 "mathops.h"
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#include "mjpegenc_common.h"
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#include "mjpeg.h"
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46
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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85
    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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89
        if (put_bytes_left(pb, 0) < 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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3816050
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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3816050
    if (mb_x == 0 || mb_y == 0) {
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198000
        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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148500
            h = s->hsample[i];
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148500
            v = s->vsample[i];
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148500
            linesize = frame->linesize[i];
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346500
            for (y = 0; y < v; y++) {
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495000
                for (x = 0; x < h; x++) {
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                    int pred;
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297000
                    ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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297000
                    if (y == 0 && mb_y == 0) {
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109000
                        if (x == 0 && mb_x == 0)
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                            pred = 128;
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                        else
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108400
                            pred = ptr[-1];
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                    } else {
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188000
                        if (x == 0 && mb_x == 0) {
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89200
                            pred = ptr[-linesize];
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                        } else {
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98800
                            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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297000
                    if (i == 0)
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198000
                        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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99000
                        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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15066200
        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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11299650
            h = s->hsample[i];
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11299650
            v = s->vsample[i];
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11299650
            linesize = frame->linesize[i];
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26365850
            for (y = 0; y < v; y++) {
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37665500
                for (x = 0; x < h; x++) {
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                    int pred;
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22599300
                    ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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22599300
                    PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
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22599300
                    if (i == 0)
189
15066200
                        ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
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                    else
191
7533100
                        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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3816050
}
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static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
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                            const AVFrame *frame)
200
{
201
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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
207
FF_DISABLE_DEPRECATION_WARNINGS
208
200
    if (avctx->prediction_method)
209
        s->pred = avctx->prediction_method + 1;
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FF_ENABLE_DEPRECATION_WARNINGS
211
#endif
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22650
    for (mb_y = 0; mb_y < mb_height; mb_y++) {
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22450
        if (put_bytes_left(pb, 0) <
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22450
            mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
216
            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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3838500
        for (mb_x = 0; mb_x < mb_width; mb_x++)
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3816050
            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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200
                        * s->hsample[0] * s->vsample[0];
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    }
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249
200
    if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
250
        return ret;
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    init_put_bits(&pb, pkt->data, pkt->size);
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254
200
    ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
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200
                                   s->pred, s->matrix, s->matrix);
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200
    header_bits = put_bits_count(&pb);
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259
200
    if(    avctx->pix_fmt == AV_PIX_FMT_BGR0
260
200
        || avctx->pix_fmt == AV_PIX_FMT_BGRA
261
200
        || avctx->pix_fmt == AV_PIX_FMT_BGR24)
262
        ret = ljpeg_encode_bgr(avctx, &pb, pict);
263
    else
264
200
        ret = ljpeg_encode_yuv(avctx, &pb, pict);
265
200
    if (ret < 0)
266
        return ret;
267
268
200
    emms_c();
269
270
200
    ff_mjpeg_escape_FF(&pb, header_bits >> 3);
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200
    ff_mjpeg_encode_picture_trailer(&pb, header_bits);
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200
    flush_put_bits(&pb);
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200
    pkt->size   = put_bits_ptr(&pb) - pb.buf;
275
200
    pkt->flags |= AV_PKT_FLAG_KEY;
276
200
    *got_packet = 1;
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278
200
    return 0;
279
}
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281
4
static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
282
{
283
4
    LJpegEncContext *s = avctx->priv_data;
284
285
4
    av_freep(&s->scratch);
286
287
4
    return 0;
288
}
289
290
4
static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
291
{
292
4
    int ret = ff_mjpeg_encode_check_pix_fmt(avctx);
293
4
    LJpegEncContext *s = avctx->priv_data;
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295
4
    if (ret < 0)
296
        return ret;
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#if FF_API_CODED_FRAME
299
FF_DISABLE_DEPRECATION_WARNINGS
300
4
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
301
4
    avctx->coded_frame->key_frame = 1;
302
FF_ENABLE_DEPRECATION_WARNINGS
303
#endif
304
305
4
    s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
306
4
    if (!s->scratch)
307
        return AVERROR(ENOMEM);
308
309
4
    ff_idctdsp_init(&s->idsp, avctx);
310
4
    ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
311
                      ff_zigzag_direct);
312
313
4
    ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
314
315
4
    ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
316
4
                                 s->huff_code_dc_luminance,
317
                                 avpriv_mjpeg_bits_dc_luminance,
318
                                 avpriv_mjpeg_val_dc);
319
4
    ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
320
4
                                 s->huff_code_dc_chrominance,
321
                                 avpriv_mjpeg_bits_dc_chrominance,
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                                 avpriv_mjpeg_val_dc);
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324
4
    return 0;
325
}
326
327
#define OFFSET(x) offsetof(LJpegEncContext, x)
328
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
329
static const AVOption options[] = {
330
{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
331
    { "left",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
332
    { "plane",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
333
    { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
334
335
    { NULL},
336
};
337
338
static const AVClass ljpeg_class = {
339
    .class_name = "ljpeg",
340
    .item_name  = av_default_item_name,
341
    .option     = options,
342
    .version    = LIBAVUTIL_VERSION_INT,
343
};
344
345
AVCodec ff_ljpeg_encoder = {
346
    .name           = "ljpeg",
347
    .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
348
    .type           = AVMEDIA_TYPE_VIDEO,
349
    .id             = AV_CODEC_ID_LJPEG,
350
    .priv_data_size = sizeof(LJpegEncContext),
351
    .priv_class     = &ljpeg_class,
352
    .init           = ljpeg_encode_init,
353
    .encode2        = ljpeg_encode_frame,
354
    .close          = ljpeg_encode_close,
355
    .capabilities   = AV_CODEC_CAP_FRAME_THREADS,
356
    .pix_fmts       = (const enum AVPixelFormat[]){
357
        AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
358
        AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
359
        AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
360
        AV_PIX_FMT_NONE},
361
};