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  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/internal.h"
  25. #include "libavutil/intreadwrite.h"
  26. #include "libavutil/pixdesc.h"
  27. #include "avcodec.h"
  28. #include "internal.h"
  29. #include "rle.h"
  30. #include "targa.h"
  31.  
  32. /**
  33.  * RLE compress the image, with maximum size of out_size
  34.  * @param outbuf Output buffer
  35.  * @param out_size Maximum output size
  36.  * @param pic Image to compress
  37.  * @param bpp Bytes per pixel
  38.  * @param w Image width
  39.  * @param h Image height
  40.  * @return Size of output in bytes, or -1 if larger than out_size
  41.  */
  42. static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
  43.                             int bpp, int w, int h)
  44. {
  45.     int y,ret;
  46.     uint8_t *out;
  47.  
  48.     out = outbuf;
  49.  
  50.     for(y = 0; y < h; y ++) {
  51.         ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
  52.         if(ret == -1){
  53.             return -1;
  54.         }
  55.         out+= ret;
  56.         out_size -= ret;
  57.     }
  58.  
  59.     return out - outbuf;
  60. }
  61.  
  62. static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
  63. {
  64.     int i, n = bpp * w;
  65.     uint8_t *out = outbuf;
  66.     uint8_t *ptr = pic->data[0];
  67.  
  68.     for(i=0; i < h; i++) {
  69.         memcpy(out, ptr, n);
  70.         out += n;
  71.         ptr += pic->linesize[0];
  72.     }
  73.  
  74.     return out - outbuf;
  75. }
  76.  
  77. static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  78.                               const AVFrame *p, int *got_packet)
  79. {
  80.     int bpp, picsize, datasize = -1, ret, i;
  81.     uint8_t *out;
  82.  
  83.     if(avctx->width > 0xffff || avctx->height > 0xffff) {
  84.         av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
  85.         return AVERROR(EINVAL);
  86.     }
  87.     picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  88.     if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
  89.         return ret;
  90.  
  91.     /* zero out the header and only set applicable fields */
  92.     memset(pkt->data, 0, 12);
  93.     AV_WL16(pkt->data+12, avctx->width);
  94.     AV_WL16(pkt->data+14, avctx->height);
  95.     /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
  96.     pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
  97.  
  98.     out = pkt->data + 18;  /* skip past the header we write */
  99.  
  100.     avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
  101.     switch(avctx->pix_fmt) {
  102.     case AV_PIX_FMT_PAL8: {
  103.         int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
  104.         for (i = 0; i < 256; i++)
  105.             if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
  106.                 pal_bpp = 32;
  107.                 break;
  108.             }
  109.         pkt->data[1]  = 1;          /* palette present */
  110.         pkt->data[2]  = TGA_PAL;    /* uncompressed palettised image */
  111.         pkt->data[6]  = 1;          /* palette contains 256 entries */
  112.         pkt->data[7]  = pal_bpp;    /* palette contains pal_bpp bit entries */
  113.         pkt->data[16] = 8;          /* bpp */
  114.         for (i = 0; i < 256; i++)
  115.             if (pal_bpp == 32) {
  116.                 AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
  117.             } else {
  118.             AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
  119.             }
  120.         out += 32 * pal_bpp;        /* skip past the palette we just output */
  121.         break;
  122.         }
  123.     case AV_PIX_FMT_GRAY8:
  124.         pkt->data[2]  = TGA_BW;     /* uncompressed grayscale image */
  125.         avctx->bits_per_coded_sample = 0x28;
  126.         pkt->data[16] = 8;          /* bpp */
  127.         break;
  128.     case AV_PIX_FMT_RGB555LE:
  129.         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
  130.         avctx->bits_per_coded_sample =
  131.         pkt->data[16] = 16;         /* bpp */
  132.         break;
  133.     case AV_PIX_FMT_BGR24:
  134.         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
  135.         pkt->data[16] = 24;         /* bpp */
  136.         break;
  137.     case AV_PIX_FMT_BGRA:
  138.         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
  139.         pkt->data[16] = 32;         /* bpp */
  140.         break;
  141.     default:
  142.         av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
  143.                av_get_pix_fmt_name(avctx->pix_fmt));
  144.         return AVERROR(EINVAL);
  145.     }
  146.     bpp = pkt->data[16] >> 3;
  147.  
  148.     /* try RLE compression */
  149.     if (avctx->coder_type != FF_CODER_TYPE_RAW)
  150.         datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
  151.  
  152.     /* if that worked well, mark the picture as RLE compressed */
  153.     if(datasize >= 0)
  154.         pkt->data[2] |= TGA_RLE;
  155.  
  156.     /* if RLE didn't make it smaller, go back to no compression */
  157.     else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
  158.  
  159.     out += datasize;
  160.  
  161.     /* The standard recommends including this section, even if we don't use
  162.      * any of the features it affords. TODO: take advantage of the pixel
  163.      * aspect ratio and encoder ID fields available? */
  164.     memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
  165.  
  166.     pkt->size   = out + 26 - pkt->data;
  167.     pkt->flags |= AV_PKT_FLAG_KEY;
  168.     *got_packet = 1;
  169.  
  170.     return 0;
  171. }
  172.  
  173. AVCodec ff_targa_encoder = {
  174.     .name           = "targa",
  175.     .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
  176.     .type           = AVMEDIA_TYPE_VIDEO,
  177.     .id             = AV_CODEC_ID_TARGA,
  178.     .encode2        = targa_encode_frame,
  179.     .pix_fmts       = (const enum AVPixelFormat[]){
  180.         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
  181.         AV_PIX_FMT_NONE
  182.     },
  183. };
  184.