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"
23 #include "libavutil/pixdesc.h"
28 typedef struct TargaContext {
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
42 static int targa_encode_rle(uint8_t *outbuf, int out_size, AVFrame *pic,
43 int bpp, int w, int h)
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);
62 static int targa_encode_normal(uint8_t *outbuf, AVFrame *pic, int bpp, int w, int h)
65 uint8_t *out = outbuf;
66 uint8_t *ptr = pic->data[0];
68 for(i=0; i < h; i++) {
71 ptr += pic->linesize[0];
77 static int targa_encode_frame(AVCodecContext *avctx,
78 unsigned char *outbuf,
79 int buf_size, void *data){
81 int bpp, picsize, datasize = -1;
84 if(avctx->width > 0xffff || avctx->height > 0xffff) {
85 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
86 return AVERROR(EINVAL);
88 picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
89 if(buf_size < picsize + 45) {
90 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
91 return AVERROR(EINVAL);
94 p->pict_type= AV_PICTURE_TYPE_I;
97 /* zero out the header and only set applicable fields */
98 memset(outbuf, 0, 12);
99 AV_WL16(outbuf+12, avctx->width);
100 AV_WL16(outbuf+14, avctx->height);
101 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
102 outbuf[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
104 switch(avctx->pix_fmt) {
106 outbuf[2] = TGA_BW; /* uncompressed grayscale image */
107 outbuf[16] = 8; /* bpp */
109 case PIX_FMT_RGB555LE:
110 outbuf[2] = TGA_RGB; /* uncompresses true-color image */
111 outbuf[16] = 16; /* bpp */
114 outbuf[2] = TGA_RGB; /* uncompressed true-color image */
115 outbuf[16] = 24; /* bpp */
118 outbuf[2] = TGA_RGB; /* uncompressed true-color image */
119 outbuf[16] = 32; /* bpp */
122 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
123 av_get_pix_fmt_name(avctx->pix_fmt));
124 return AVERROR(EINVAL);
126 bpp = outbuf[16] >> 3;
128 out = outbuf + 18; /* skip past the header we just output */
130 /* try RLE compression */
131 if (avctx->coder_type != FF_CODER_TYPE_RAW)
132 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
134 /* if that worked well, mark the picture as RLE compressed */
138 /* if RLE didn't make it smaller, go back to no compression */
139 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
143 /* The standard recommends including this section, even if we don't use
144 * any of the features it affords. TODO: take advantage of the pixel
145 * aspect ratio and encoder ID fields available? */
146 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
148 return out + 26 - outbuf;
151 static av_cold int targa_encode_init(AVCodecContext *avctx)
153 TargaContext *s = avctx->priv_data;
155 avcodec_get_frame_defaults(&s->picture);
156 s->picture.key_frame= 1;
157 avctx->coded_frame= &s->picture;
162 AVCodec ff_targa_encoder = {
164 .type = AVMEDIA_TYPE_VIDEO,
165 .id = CODEC_ID_TARGA,
166 .priv_data_size = sizeof(TargaContext),
167 .init = targa_encode_init,
168 .encode = targa_encode_frame,
169 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_NONE},
170 .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),