2 * Targa (.tga) image decoder
3 * Copyright (c) 2006 Konstantin Shishkov
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
25 #include "bytestream.h"
28 typedef struct TargaContext {
37 #define CHECK_BUFFER_SIZE(buf, buf_end, needed, where) \
38 if(needed > buf_end - buf){ \
39 av_log(avctx, AV_LOG_ERROR, "Problem: unexpected end of data while reading " where "\n"); \
43 static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, const uint8_t *src, int src_size, uint8_t *dst, int w, int h, int stride, int bpp)
46 int depth = (bpp + 1) >> 3;
49 const uint8_t *src_end = src + src_size;
51 diff = stride - w * depth;
54 CHECK_BUFFER_SIZE(src, src_end, 1, "image type");
56 count = (type & 0x7F) + 1;
58 if((x + count > w) && (x + count + 1 > (h - y) * w)){
59 av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count);
63 CHECK_BUFFER_SIZE(src, src_end, depth, "image data");
65 CHECK_BUFFER_SIZE(src, src_end, count * depth, "image data");
67 for(i = 0; i < count; i++){
73 *((uint16_t*)dst) = AV_RL16(src);
81 *((uint32_t*)dst) = AV_RL32(src);
101 static int decode_frame(AVCodecContext *avctx,
102 void *data, int *data_size,
105 const uint8_t *buf = avpkt->data;
106 const uint8_t *buf_end = avpkt->data + avpkt->size;
107 TargaContext * const s = avctx->priv_data;
108 AVFrame *picture = data;
109 AVFrame * const p= (AVFrame*)&s->picture;
112 int idlen, compr, y, w, h, bpp, flags;
113 int first_clr, colors, csize;
115 /* parse image header */
116 CHECK_BUFFER_SIZE(buf, buf_end, 18, "header");
120 first_clr = AV_RL16(buf); buf += 2;
121 colors = AV_RL16(buf); buf += 2;
124 y = AV_RL16(buf); buf += 2;
125 w = AV_RL16(buf); buf += 2;
126 h = AV_RL16(buf); buf += 2;
129 //skip identifier if any
130 CHECK_BUFFER_SIZE(buf, buf_end, idlen, "identifiers");
137 avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
140 avctx->pix_fmt = PIX_FMT_RGB555;
143 avctx->pix_fmt = PIX_FMT_RGB555;
146 avctx->pix_fmt = PIX_FMT_BGR24;
149 avctx->pix_fmt = PIX_FMT_RGB32;
152 av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", s->bpp);
156 if(s->picture.data[0])
157 avctx->release_buffer(avctx, &s->picture);
159 if(av_image_check_size(w, h, 0, avctx))
161 if(w != avctx->width || h != avctx->height)
162 avcodec_set_dimensions(avctx, w, h);
163 if(avctx->get_buffer(avctx, p) < 0){
164 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
169 stride = p->linesize[0];
170 }else{ //image is upside-down
171 dst = p->data[0] + p->linesize[0] * (h - 1);
172 stride = -p->linesize[0];
176 int pal_size, pal_sample_size;
177 if((colors + first_clr) > 256){
178 av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
182 case 24: pal_sample_size = 3; break;
184 case 15: pal_sample_size = 2; break;
186 av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
189 pal_size = colors * pal_sample_size;
190 CHECK_BUFFER_SIZE(buf, buf_end, pal_size, "color table");
191 if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
195 uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
197 switch (pal_sample_size) {
200 for (t = 0; t < colors; t++)
201 *pal++ = bytestream_get_le24(&buf);
205 for (t = 0; t < colors; t++) {
206 uint32_t v = bytestream_get_le16(&buf);
207 v = ((v & 0x7C00) << 9) |
208 ((v & 0x03E0) << 6) |
210 /* left bit replication */
211 v |= (v & 0xE0E0E0U) >> 5;
216 p->palette_has_changed = 1;
219 if((compr & (~TGA_RLE)) == TGA_NODATA)
220 memset(p->data[0], 0, p->linesize[0] * s->height);
223 int res = targa_decode_rle(avctx, s, buf, buf_end - buf, dst, avctx->width, avctx->height, stride, bpp);
228 size_t img_size = s->width * ((s->bpp + 1) >> 3);
229 CHECK_BUFFER_SIZE(buf, buf_end, img_size, "image data");
230 for(y = 0; y < s->height; y++){
233 if((s->bpp + 1) >> 3 == 2){
234 uint16_t *dst16 = (uint16_t*)dst;
235 for(x = 0; x < s->width; x++)
236 dst16[x] = AV_RL16(buf + x * 2);
237 }else if((s->bpp + 1) >> 3 == 4){
238 uint32_t *dst32 = (uint32_t*)dst;
239 for(x = 0; x < s->width; x++)
240 dst32[x] = AV_RL32(buf + x * 4);
243 memcpy(dst, buf, img_size);
251 *picture= *(AVFrame*)&s->picture;
252 *data_size = sizeof(AVPicture);
257 static av_cold int targa_init(AVCodecContext *avctx){
258 TargaContext *s = avctx->priv_data;
260 avcodec_get_frame_defaults((AVFrame*)&s->picture);
261 avctx->coded_frame= (AVFrame*)&s->picture;
266 static av_cold int targa_end(AVCodecContext *avctx){
267 TargaContext *s = avctx->priv_data;
269 if(s->picture.data[0])
270 avctx->release_buffer(avctx, &s->picture);
275 AVCodec ff_targa_decoder = {
277 .type = AVMEDIA_TYPE_VIDEO,
278 .id = CODEC_ID_TARGA,
279 .priv_data_size = sizeof(TargaContext),
282 .decode = decode_frame,
283 .capabilities = CODEC_CAP_DR1,
284 .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),