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
24 typedef struct TargaContext {
29 * RLE compress the image, with maximum size of out_size
30 * @param outbuf Output buffer
31 * @param out_size Maximum output size
32 * @param pic Image to compress
33 * @param bpp Bytes per pixel
34 * @param w Image width
35 * @param h Image height
36 * @return Size of output in bytes, or -1 if larger than out_size
38 static int targa_encode_rle(uint8_t *outbuf, int out_size, AVFrame *pic,
39 int bpp, int w, int h)
46 for(y = 0; y < h; y ++) {
47 ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
58 static int targa_encode_normal(uint8_t *outbuf, AVFrame *pic, int bpp, int w, int h)
61 uint8_t *out = outbuf;
62 uint8_t *ptr = pic->data[0];
64 for(i=0; i < h; i++) {
67 ptr += pic->linesize[0];
73 static int targa_encode_frame(AVCodecContext *avctx,
74 unsigned char *outbuf,
75 int buf_size, void *data){
77 int bpp, picsize, datasize;
80 if(avctx->width > 0xffff || avctx->height > 0xffff) {
81 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
84 picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
85 if(buf_size < picsize + 45) {
86 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
90 p->pict_type= FF_I_TYPE;
93 /* zero out the header and only set applicable fields */
94 memset(outbuf, 0, 12);
95 AV_WL16(outbuf+12, avctx->width);
96 AV_WL16(outbuf+14, avctx->height);
97 outbuf[17] = 0x20; /* origin is top-left. no alpha */
99 /* TODO: support alpha channel */
100 switch(avctx->pix_fmt) {
102 outbuf[2] = 3; /* uncompressed grayscale image */
103 outbuf[16] = 8; /* bpp */
106 outbuf[2] = 2; /* uncompresses true-color image */
107 outbuf[16] = 16; /* bpp */
110 outbuf[2] = 2; /* uncompressed true-color image */
111 outbuf[16] = 24; /* bpp */
116 bpp = outbuf[16] >> 3;
118 out = outbuf + 18; /* skip past the header we just output */
120 /* try RLE compression */
121 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
123 /* if that worked well, mark the picture as RLE compressed */
127 /* if RLE didn't make it smaller, go back to no compression */
128 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
132 /* The standard recommends including this section, even if we don't use
133 * any of the features it affords. TODO: take advantage of the pixel
134 * aspect ratio and encoder ID fields available? */
135 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
137 return out + 26 - outbuf;
140 static av_cold int targa_encode_init(AVCodecContext *avctx)
142 TargaContext *s = avctx->priv_data;
144 avcodec_get_frame_defaults(&s->picture);
145 s->picture.key_frame= 1;
146 avctx->coded_frame= &s->picture;
151 AVCodec targa_encoder = {
153 .type = CODEC_TYPE_VIDEO,
154 .id = CODEC_ID_TARGA,
155 .priv_data_size = sizeof(TargaContext),
156 .init = targa_encode_init,
157 .encode = targa_encode_frame,
158 .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB555, PIX_FMT_GRAY8, PIX_FMT_NONE},
159 .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),