LCOV - code coverage report
Current view: top level - libavcodec - targaenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 50 90 55.6 %
Date: 2017-12-13 18:07:29 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Targa (.tga) image encoder
       3             :  * Copyright (c) 2007 Bobby Bingham
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <string.h>
      23             : 
      24             : #include "libavutil/imgutils.h"
      25             : #include "libavutil/internal.h"
      26             : #include "libavutil/intreadwrite.h"
      27             : #include "libavutil/opt.h"
      28             : #include "libavutil/pixdesc.h"
      29             : #include "avcodec.h"
      30             : #include "internal.h"
      31             : #include "rle.h"
      32             : #include "targa.h"
      33             : 
      34             : typedef struct TargaContext {
      35             :     AVClass *class;
      36             : 
      37             :     int rle;
      38             : } TargaContext;
      39             : 
      40             : /**
      41             :  * RLE compress the image, with maximum size of out_size
      42             :  * @param outbuf Output buffer
      43             :  * @param out_size Maximum output size
      44             :  * @param pic Image to compress
      45             :  * @param bpp Bytes per pixel
      46             :  * @param w Image width
      47             :  * @param h Image height
      48             :  * @return Size of output in bytes, or -1 if larger than out_size
      49             :  */
      50          13 : static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
      51             :                             int bpp, int w, int h)
      52             : {
      53             :     int y,ret;
      54             :     uint8_t *out;
      55             : 
      56          13 :     out = outbuf;
      57             : 
      58        3744 :     for(y = 0; y < h; y ++) {
      59        3744 :         ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
      60        3744 :         if(ret == -1){
      61          13 :             return -1;
      62             :         }
      63        3731 :         out+= ret;
      64        3731 :         out_size -= ret;
      65             :     }
      66             : 
      67           0 :     return out - outbuf;
      68             : }
      69             : 
      70          13 : static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
      71             : {
      72          13 :     int i, n = bpp * w;
      73          13 :     uint8_t *out = outbuf;
      74          13 :     uint8_t *ptr = pic->data[0];
      75             : 
      76        3757 :     for(i=0; i < h; i++) {
      77        3744 :         memcpy(out, ptr, n);
      78        3744 :         out += n;
      79        3744 :         ptr += pic->linesize[0];
      80             :     }
      81             : 
      82          13 :     return out - outbuf;
      83             : }
      84             : 
      85          13 : static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
      86             :                               const AVFrame *p, int *got_packet)
      87             : {
      88          13 :     TargaContext *s = avctx->priv_data;
      89          13 :     int bpp, picsize, datasize = -1, ret, i;
      90             :     uint8_t *out;
      91             : 
      92          13 :     picsize = av_image_get_buffer_size(avctx->pix_fmt,
      93             :                                        avctx->width, avctx->height, 1);
      94          13 :     if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45, 0)) < 0)
      95           0 :         return ret;
      96             : 
      97             :     /* zero out the header and only set applicable fields */
      98          13 :     memset(pkt->data, 0, 12);
      99          13 :     AV_WL16(pkt->data+12, avctx->width);
     100          13 :     AV_WL16(pkt->data+14, avctx->height);
     101             :     /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
     102          13 :     pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
     103             : 
     104          13 :     out = pkt->data + 18;  /* skip past the header we write */
     105             : 
     106          13 :     avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
     107          13 :     switch(avctx->pix_fmt) {
     108           0 :     case AV_PIX_FMT_PAL8: {
     109           0 :         int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
     110           0 :         for (i = 0; i < 256; i++)
     111           0 :             if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
     112           0 :                 pal_bpp = 32;
     113           0 :                 break;
     114             :             }
     115           0 :         pkt->data[1]  = 1;          /* palette present */
     116           0 :         pkt->data[2]  = TGA_PAL;    /* uncompressed palettised image */
     117           0 :         pkt->data[6]  = 1;          /* palette contains 256 entries */
     118           0 :         pkt->data[7]  = pal_bpp;    /* palette contains pal_bpp bit entries */
     119           0 :         pkt->data[16] = 8;          /* bpp */
     120           0 :         for (i = 0; i < 256; i++)
     121           0 :             if (pal_bpp == 32) {
     122           0 :                 AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
     123             :             } else {
     124           0 :             AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
     125             :             }
     126           0 :         out += 32 * pal_bpp;        /* skip past the palette we just output */
     127           0 :         break;
     128             :         }
     129           0 :     case AV_PIX_FMT_GRAY8:
     130           0 :         pkt->data[2]  = TGA_BW;     /* uncompressed grayscale image */
     131           0 :         avctx->bits_per_coded_sample = 0x28;
     132           0 :         pkt->data[16] = 8;          /* bpp */
     133           0 :         break;
     134           0 :     case AV_PIX_FMT_RGB555LE:
     135           0 :         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
     136           0 :         avctx->bits_per_coded_sample =
     137           0 :         pkt->data[16] = 16;         /* bpp */
     138           0 :         break;
     139          13 :     case AV_PIX_FMT_BGR24:
     140          13 :         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
     141          13 :         pkt->data[16] = 24;         /* bpp */
     142          13 :         break;
     143           0 :     case AV_PIX_FMT_BGRA:
     144           0 :         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
     145           0 :         pkt->data[16] = 32;         /* bpp */
     146           0 :         break;
     147           0 :     default:
     148           0 :         av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
     149             :                av_get_pix_fmt_name(avctx->pix_fmt));
     150           0 :         return AVERROR(EINVAL);
     151             :     }
     152          13 :     bpp = pkt->data[16] >> 3;
     153             : 
     154             : 
     155             : #if FF_API_CODER_TYPE
     156             : FF_DISABLE_DEPRECATION_WARNINGS
     157          13 :     if (avctx->coder_type == FF_CODER_TYPE_RAW)
     158           0 :         s->rle = 0;
     159             : FF_ENABLE_DEPRECATION_WARNINGS
     160             : #endif
     161             : 
     162             :     /* try RLE compression */
     163          13 :     if (s->rle)
     164          13 :         datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
     165             : 
     166             :     /* if that worked well, mark the picture as RLE compressed */
     167          13 :     if(datasize >= 0)
     168           0 :         pkt->data[2] |= TGA_RLE;
     169             : 
     170             :     /* if RLE didn't make it smaller, go back to no compression */
     171          13 :     else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
     172             : 
     173          13 :     out += datasize;
     174             : 
     175             :     /* The standard recommends including this section, even if we don't use
     176             :      * any of the features it affords. TODO: take advantage of the pixel
     177             :      * aspect ratio and encoder ID fields available? */
     178          13 :     memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
     179             : 
     180          13 :     pkt->size   = out + 26 - pkt->data;
     181          13 :     pkt->flags |= AV_PKT_FLAG_KEY;
     182          13 :     *got_packet = 1;
     183             : 
     184          13 :     return 0;
     185             : }
     186             : 
     187           1 : static av_cold int targa_encode_init(AVCodecContext *avctx)
     188             : {
     189           1 :     if (avctx->width > 0xffff || avctx->height > 0xffff) {
     190           0 :         av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
     191           0 :         return AVERROR(EINVAL);
     192             :     }
     193             : 
     194             : #if FF_API_CODED_FRAME
     195             : FF_DISABLE_DEPRECATION_WARNINGS
     196           1 :     avctx->coded_frame->key_frame = 1;
     197           1 :     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
     198             : FF_ENABLE_DEPRECATION_WARNINGS
     199             : #endif
     200             : 
     201           1 :     return 0;
     202             : }
     203             : 
     204             : #define OFFSET(x) offsetof(TargaContext, x)
     205             : #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
     206             : static const AVOption options[] = {
     207             :     { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
     208             : 
     209             :     { NULL },
     210             : };
     211             : 
     212             : static const AVClass targa_class = {
     213             :     .class_name = "targa",
     214             :     .item_name  = av_default_item_name,
     215             :     .option     = options,
     216             :     .version    = LIBAVUTIL_VERSION_INT,
     217             : };
     218             : 
     219             : AVCodec ff_targa_encoder = {
     220             :     .name           = "targa",
     221             :     .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
     222             :     .type           = AVMEDIA_TYPE_VIDEO,
     223             :     .id             = AV_CODEC_ID_TARGA,
     224             :     .priv_data_size = sizeof(TargaContext),
     225             :     .priv_class     = &targa_class,
     226             :     .init           = targa_encode_init,
     227             :     .encode2        = targa_encode_frame,
     228             :     .pix_fmts       = (const enum AVPixelFormat[]){
     229             :         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
     230             :         AV_PIX_FMT_NONE
     231             :     },
     232             : };

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