Libav 0.7.1
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00001 /* 00002 * Targa (.tga) image encoder 00003 * Copyright (c) 2007 Bobby Bingham 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "libavutil/intreadwrite.h" 00023 #include "libavutil/pixdesc.h" 00024 #include "avcodec.h" 00025 #include "rle.h" 00026 #include "targa.h" 00027 00028 typedef struct TargaContext { 00029 AVFrame picture; 00030 } TargaContext; 00031 00042 static int targa_encode_rle(uint8_t *outbuf, int out_size, AVFrame *pic, 00043 int bpp, int w, int h) 00044 { 00045 int y,ret; 00046 uint8_t *out; 00047 00048 out = outbuf; 00049 00050 for(y = 0; y < h; y ++) { 00051 ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0); 00052 if(ret == -1){ 00053 return -1; 00054 } 00055 out+= ret; 00056 out_size -= ret; 00057 } 00058 00059 return out - outbuf; 00060 } 00061 00062 static int targa_encode_normal(uint8_t *outbuf, AVFrame *pic, int bpp, int w, int h) 00063 { 00064 int i, n = bpp * w; 00065 uint8_t *out = outbuf; 00066 uint8_t *ptr = pic->data[0]; 00067 00068 for(i=0; i < h; i++) { 00069 memcpy(out, ptr, n); 00070 out += n; 00071 ptr += pic->linesize[0]; 00072 } 00073 00074 return out - outbuf; 00075 } 00076 00077 static int targa_encode_frame(AVCodecContext *avctx, 00078 unsigned char *outbuf, 00079 int buf_size, void *data){ 00080 AVFrame *p = data; 00081 int bpp, picsize, datasize = -1; 00082 uint8_t *out; 00083 00084 if(avctx->width > 0xffff || avctx->height > 0xffff) { 00085 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); 00086 return AVERROR(EINVAL); 00087 } 00088 picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); 00089 if(buf_size < picsize + 45) { 00090 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n"); 00091 return AVERROR(EINVAL); 00092 } 00093 00094 p->pict_type= AV_PICTURE_TYPE_I; 00095 p->key_frame= 1; 00096 00097 /* zero out the header and only set applicable fields */ 00098 memset(outbuf, 0, 12); 00099 AV_WL16(outbuf+12, avctx->width); 00100 AV_WL16(outbuf+14, avctx->height); 00101 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */ 00102 outbuf[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0); 00103 00104 switch(avctx->pix_fmt) { 00105 case PIX_FMT_GRAY8: 00106 outbuf[2] = TGA_BW; /* uncompressed grayscale image */ 00107 outbuf[16] = 8; /* bpp */ 00108 break; 00109 case PIX_FMT_RGB555LE: 00110 outbuf[2] = TGA_RGB; /* uncompresses true-color image */ 00111 outbuf[16] = 16; /* bpp */ 00112 break; 00113 case PIX_FMT_BGR24: 00114 outbuf[2] = TGA_RGB; /* uncompressed true-color image */ 00115 outbuf[16] = 24; /* bpp */ 00116 break; 00117 case PIX_FMT_BGRA: 00118 outbuf[2] = TGA_RGB; /* uncompressed true-color image */ 00119 outbuf[16] = 32; /* bpp */ 00120 break; 00121 default: 00122 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n", 00123 av_get_pix_fmt_name(avctx->pix_fmt)); 00124 return AVERROR(EINVAL); 00125 } 00126 bpp = outbuf[16] >> 3; 00127 00128 out = outbuf + 18; /* skip past the header we just output */ 00129 00130 /* try RLE compression */ 00131 if (avctx->coder_type != FF_CODER_TYPE_RAW) 00132 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height); 00133 00134 /* if that worked well, mark the picture as RLE compressed */ 00135 if(datasize >= 0) 00136 outbuf[2] |= 8; 00137 00138 /* if RLE didn't make it smaller, go back to no compression */ 00139 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height); 00140 00141 out += datasize; 00142 00143 /* The standard recommends including this section, even if we don't use 00144 * any of the features it affords. TODO: take advantage of the pixel 00145 * aspect ratio and encoder ID fields available? */ 00146 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26); 00147 00148 return out + 26 - outbuf; 00149 } 00150 00151 static av_cold int targa_encode_init(AVCodecContext *avctx) 00152 { 00153 TargaContext *s = avctx->priv_data; 00154 00155 avcodec_get_frame_defaults(&s->picture); 00156 s->picture.key_frame= 1; 00157 avctx->coded_frame= &s->picture; 00158 00159 return 0; 00160 } 00161 00162 AVCodec ff_targa_encoder = { 00163 .name = "targa", 00164 .type = AVMEDIA_TYPE_VIDEO, 00165 .id = CODEC_ID_TARGA, 00166 .priv_data_size = sizeof(TargaContext), 00167 .init = targa_encode_init, 00168 .encode = targa_encode_frame, 00169 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_NONE}, 00170 .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"), 00171 };