2 * Targa (.tga) image encoder
3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
27 typedef struct TargaContext {
32 * RLE compress the image, with maximum size of out_size
33 * @param outbuf Output buffer
34 * @param out_size Maximum output size
35 * @param pic Image to compress
36 * @param bpp Bytes per pixel
37 * @param w Image width
38 * @param h Image height
39 * @return Size of output in bytes, or -1 if larger than out_size
41 static int targa_encode_rle(uint8_t *outbuf, int out_size, AVFrame *pic,
42 int bpp, int w, int h)
49 for(y = 0; y < h; y ++) {
50 ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
61 static int targa_encode_normal(uint8_t *outbuf, AVFrame *pic, int bpp, int w, int h)
64 uint8_t *out = outbuf;
65 uint8_t *ptr = pic->data[0];
67 for(i=0; i < h; i++) {
70 ptr += pic->linesize[0];
76 static int targa_encode_frame(AVCodecContext *avctx,
77 unsigned char *outbuf,
78 int buf_size, void *data){
80 int bpp, picsize, datasize = -1;
83 if(avctx->width > 0xffff || avctx->height > 0xffff) {
84 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
85 return AVERROR(EINVAL);
87 picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
88 if(buf_size < picsize + 45) {
89 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
90 return AVERROR(EINVAL);
93 p->pict_type= FF_I_TYPE;
96 /* zero out the header and only set applicable fields */
97 memset(outbuf, 0, 12);
98 AV_WL16(outbuf+12, avctx->width);
99 AV_WL16(outbuf+14, avctx->height);
100 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
101 outbuf[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
103 switch(avctx->pix_fmt) {
105 outbuf[2] = TGA_BW; /* uncompressed grayscale image */
106 outbuf[16] = 8; /* bpp */
108 case PIX_FMT_RGB555LE:
109 outbuf[2] = TGA_RGB; /* uncompresses true-color image */
110 outbuf[16] = 16; /* bpp */
113 outbuf[2] = TGA_RGB; /* uncompressed true-color image */
114 outbuf[16] = 24; /* bpp */
117 outbuf[2] = TGA_RGB; /* uncompressed true-color image */
118 outbuf[16] = 32; /* bpp */
121 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
122 avcodec_get_pix_fmt_name(avctx->pix_fmt));
123 return AVERROR(EINVAL);
125 bpp = outbuf[16] >> 3;
127 out = outbuf + 18; /* skip past the header we just output */
129 /* try RLE compression */
130 if (avctx->coder_type != FF_CODER_TYPE_RAW)
131 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
133 /* if that worked well, mark the picture as RLE compressed */
137 /* if RLE didn't make it smaller, go back to no compression */
138 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
142 /* The standard recommends including this section, even if we don't use
143 * any of the features it affords. TODO: take advantage of the pixel
144 * aspect ratio and encoder ID fields available? */
145 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
147 return out + 26 - outbuf;
150 static av_cold int targa_encode_init(AVCodecContext *avctx)
152 TargaContext *s = avctx->priv_data;
154 avcodec_get_frame_defaults(&s->picture);
155 s->picture.key_frame= 1;
156 avctx->coded_frame= &s->picture;
161 AVCodec ff_targa_encoder = {
163 .type = AVMEDIA_TYPE_VIDEO,
164 .id = CODEC_ID_TARGA,
165 .priv_data_size = sizeof(TargaContext),
166 .init = targa_encode_init,
167 .encode = targa_encode_frame,
168 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_NONE},
169 .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),