GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/targaenc.c Lines: 50 90 55.6 %
Date: 2020-09-25 23:16:12 Branches: 13 34 38.2 %

Line Branch Exec Source
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/*
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 * Targa (.tga) image encoder
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 * Copyright (c) 2007 Bobby Bingham
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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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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.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 "internal.h"
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#include "rle.h"
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#include "targa.h"
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typedef struct TargaContext {
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    AVClass *class;
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    int rle;
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} TargaContext;
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/**
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 * RLE compress the image, with maximum size of out_size
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 * @param outbuf Output buffer
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 * @param out_size Maximum output size
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 * @param pic Image to compress
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 * @param bpp Bytes per pixel
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 * @param w Image width
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 * @param h Image height
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 * @return Size of output in bytes, or -1 if larger than out_size
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 */
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static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
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                            int bpp, int w, int h)
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{
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    int y,ret;
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    uint8_t *out;
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    out = outbuf;
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    for(y = 0; y < h; y ++) {
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        ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
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        if(ret == -1){
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            return -1;
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        }
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        out+= ret;
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        out_size -= ret;
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    }
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    return out - outbuf;
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}
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static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
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{
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    int i, n = bpp * w;
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    uint8_t *out = outbuf;
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    uint8_t *ptr = pic->data[0];
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    for(i=0; i < h; i++) {
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        memcpy(out, ptr, n);
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        out += n;
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        ptr += pic->linesize[0];
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    }
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    return out - outbuf;
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}
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static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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                              const AVFrame *p, int *got_packet)
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{
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    TargaContext *s = avctx->priv_data;
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    int bpp, picsize, datasize = -1, ret, i;
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    uint8_t *out;
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    picsize = av_image_get_buffer_size(avctx->pix_fmt,
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                                       avctx->width, avctx->height, 1);
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    if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45, 0)) < 0)
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        return ret;
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    /* zero out the header and only set applicable fields */
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    memset(pkt->data, 0, 12);
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    AV_WL16(pkt->data+12, avctx->width);
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    AV_WL16(pkt->data+14, avctx->height);
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    /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
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    pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
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    out = pkt->data + 18;  /* skip past the header we write */
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    avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
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    switch(avctx->pix_fmt) {
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    case AV_PIX_FMT_PAL8: {
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        int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
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        for (i = 0; i < 256; i++)
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            if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
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                pal_bpp = 32;
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                break;
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            }
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        pkt->data[1]  = 1;          /* palette present */
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        pkt->data[2]  = TGA_PAL;    /* uncompressed palettised image */
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        pkt->data[6]  = 1;          /* palette contains 256 entries */
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        pkt->data[7]  = pal_bpp;    /* palette contains pal_bpp bit entries */
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        pkt->data[16] = 8;          /* bpp */
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        for (i = 0; i < 256; i++)
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            if (pal_bpp == 32) {
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                AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
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            } else {
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            AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
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            }
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        out += 32 * pal_bpp;        /* skip past the palette we just output */
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        break;
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        }
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    case AV_PIX_FMT_GRAY8:
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        pkt->data[2]  = TGA_BW;     /* uncompressed grayscale image */
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        avctx->bits_per_coded_sample = 0x28;
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        pkt->data[16] = 8;          /* bpp */
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        break;
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    case AV_PIX_FMT_RGB555LE:
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        pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
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        avctx->bits_per_coded_sample =
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        pkt->data[16] = 16;         /* bpp */
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        break;
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    case AV_PIX_FMT_BGR24:
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        pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
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        pkt->data[16] = 24;         /* bpp */
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        break;
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    case AV_PIX_FMT_BGRA:
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        pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
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        pkt->data[16] = 32;         /* bpp */
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        break;
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    default:
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        av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
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               av_get_pix_fmt_name(avctx->pix_fmt));
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        return AVERROR(EINVAL);
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    }
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    bpp = pkt->data[16] >> 3;
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#if FF_API_CODER_TYPE
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FF_DISABLE_DEPRECATION_WARNINGS
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    if (avctx->coder_type == FF_CODER_TYPE_RAW)
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        s->rle = 0;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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    /* try RLE compression */
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    if (s->rle)
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        datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
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    /* if that worked well, mark the picture as RLE compressed */
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    if(datasize >= 0)
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        pkt->data[2] |= TGA_RLE;
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    /* if RLE didn't make it smaller, go back to no compression */
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    else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
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    out += datasize;
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    /* The standard recommends including this section, even if we don't use
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     * any of the features it affords. TODO: take advantage of the pixel
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     * aspect ratio and encoder ID fields available? */
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    memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
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    pkt->size   = out + 26 - pkt->data;
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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 targa_encode_init(AVCodecContext *avctx)
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{
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    if (avctx->width > 0xffff || avctx->height > 0xffff) {
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        av_log(avctx, AV_LOG_ERROR, "image dimensions too large\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->key_frame = 1;
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    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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    return 0;
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}
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#define OFFSET(x) offsetof(TargaContext, 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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    { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
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    { NULL },
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};
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static const AVClass targa_class = {
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    .class_name = "targa",
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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_targa_encoder = {
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    .name           = "targa",
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    .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_TARGA,
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    .priv_data_size = sizeof(TargaContext),
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    .priv_class     = &targa_class,
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    .init           = targa_encode_init,
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    .encode2        = targa_encode_frame,
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    .pix_fmts       = (const enum AVPixelFormat[]){
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        AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
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        AV_PIX_FMT_NONE
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    },
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};