2 * Targa (.tga) image encoder
3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/pixdesc.h"
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, const 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, const 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, AVPacket *pkt,
78 const AVFrame *p, int *got_packet)
80 int bpp, picsize, datasize = -1, ret;
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 ((ret = ff_alloc_packet(pkt, picsize + 45)) < 0) {
89 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
93 /* zero out the header and only set applicable fields */
94 memset(pkt->data, 0, 12);
95 AV_WL16(pkt->data+12, avctx->width);
96 AV_WL16(pkt->data+14, avctx->height);
97 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
98 pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
100 switch(avctx->pix_fmt) {
101 case AV_PIX_FMT_GRAY8:
102 pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
103 pkt->data[16] = 8; /* bpp */
105 case AV_PIX_FMT_RGB555LE:
106 pkt->data[2] = TGA_RGB; /* uncompresses true-color image */
107 pkt->data[16] = 16; /* bpp */
109 case AV_PIX_FMT_BGR24:
110 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
111 pkt->data[16] = 24; /* bpp */
113 case AV_PIX_FMT_BGRA:
114 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
115 pkt->data[16] = 32; /* bpp */
118 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
119 av_get_pix_fmt_name(avctx->pix_fmt));
120 return AVERROR(EINVAL);
122 bpp = pkt->data[16] >> 3;
124 out = pkt->data + 18; /* skip past the header we just output */
126 /* try RLE compression */
127 if (avctx->coder_type != FF_CODER_TYPE_RAW)
128 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
130 /* if that worked well, mark the picture as RLE compressed */
134 /* if RLE didn't make it smaller, go back to no compression */
135 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
139 /* The standard recommends including this section, even if we don't use
140 * any of the features it affords. TODO: take advantage of the pixel
141 * aspect ratio and encoder ID fields available? */
142 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
144 pkt->size = out + 26 - pkt->data;
145 pkt->flags |= AV_PKT_FLAG_KEY;
151 static av_cold int targa_encode_init(AVCodecContext *avctx)
153 avctx->coded_frame = av_frame_alloc();
154 if (!avctx->coded_frame)
155 return AVERROR(ENOMEM);
157 avctx->coded_frame->key_frame = 1;
158 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
163 static av_cold int targa_encode_close(AVCodecContext *avctx)
165 av_frame_free(&avctx->coded_frame);
169 AVCodec ff_targa_encoder = {
171 .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
172 .type = AVMEDIA_TYPE_VIDEO,
173 .id = AV_CODEC_ID_TARGA,
174 .init = targa_encode_init,
175 .close = targa_encode_close,
176 .encode2 = targa_encode_frame,
177 .pix_fmts = (const enum AVPixelFormat[]){
178 AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8,