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"
29 typedef struct TargaContext {
34 * RLE compress the image, with maximum size of out_size
35 * @param outbuf Output buffer
36 * @param out_size Maximum output size
37 * @param pic Image to compress
38 * @param bpp Bytes per pixel
39 * @param w Image width
40 * @param h Image height
41 * @return Size of output in bytes, or -1 if larger than out_size
43 static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
44 int bpp, int w, int h)
51 for(y = 0; y < h; y ++) {
52 ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
63 static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
66 uint8_t *out = outbuf;
67 uint8_t *ptr = pic->data[0];
69 for(i=0; i < h; i++) {
72 ptr += pic->linesize[0];
78 static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
79 const AVFrame *p, int *got_packet)
81 int bpp, picsize, datasize = -1, ret, i;
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 ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
92 /* zero out the header and only set applicable fields */
93 memset(pkt->data, 0, 12);
94 AV_WL16(pkt->data+12, avctx->width);
95 AV_WL16(pkt->data+14, avctx->height);
96 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
97 pkt->data[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
99 out = pkt->data + 18; /* skip past the header we write */
101 avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
102 switch(avctx->pix_fmt) {
104 pkt->data[1] = 1; /* palette present */
105 pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
106 pkt->data[6] = 1; /* palette contains 256 entries */
107 pkt->data[7] = 24; /* palette contains 24 bit entries */
108 pkt->data[16] = 8; /* bpp */
109 for (i = 0; i < 256; i++)
110 AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
111 out += 256 * 3; /* skip past the palette we just output */
114 pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
115 avctx->bits_per_coded_sample = 0x28;
116 pkt->data[16] = 8; /* bpp */
118 case PIX_FMT_RGB555LE:
119 pkt->data[2] = TGA_RGB; /* uncompresses true-color image */
120 avctx->bits_per_coded_sample =
121 pkt->data[16] = 16; /* bpp */
124 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
125 pkt->data[16] = 24; /* bpp */
128 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
129 pkt->data[16] = 32; /* bpp */
132 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
133 av_get_pix_fmt_name(avctx->pix_fmt));
134 return AVERROR(EINVAL);
136 bpp = pkt->data[16] >> 3;
138 /* try RLE compression */
139 if (avctx->coder_type != FF_CODER_TYPE_RAW)
140 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
142 /* if that worked well, mark the picture as RLE compressed */
146 /* if RLE didn't make it smaller, go back to no compression */
147 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
151 /* The standard recommends including this section, even if we don't use
152 * any of the features it affords. TODO: take advantage of the pixel
153 * aspect ratio and encoder ID fields available? */
154 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
156 pkt->size = out + 26 - pkt->data;
157 pkt->flags |= AV_PKT_FLAG_KEY;
163 static av_cold int targa_encode_init(AVCodecContext *avctx)
165 TargaContext *s = avctx->priv_data;
167 avcodec_get_frame_defaults(&s->picture);
168 s->picture.key_frame= 1;
169 s->picture.pict_type = AV_PICTURE_TYPE_I;
170 avctx->coded_frame= &s->picture;
175 AVCodec ff_targa_encoder = {
177 .type = AVMEDIA_TYPE_VIDEO,
178 .id = AV_CODEC_ID_TARGA,
179 .priv_data_size = sizeof(TargaContext),
180 .init = targa_encode_init,
181 .encode2 = targa_encode_frame,
182 .pix_fmts = (const enum PixelFormat[]){
183 PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_PAL8,
186 .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),