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 {
36 static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
37 uint8_t *dst, int w, int h, int stride, int bpp)
40 int depth = (bpp + 1) >> 3;
44 diff = stride - w * depth;
47 if (bytestream2_get_bytes_left(&s->gb) <= 0) {
48 av_log(avctx, AV_LOG_ERROR,
49 "Ran ouf of data before end-of-image\n");
50 return AVERROR_INVALIDDATA;
52 type = bytestream2_get_byteu(&s->gb);
53 count = (type & 0x7F) + 1;
55 if (x + count > w && x + count + 1 > (h - y) * w) {
56 av_log(avctx, AV_LOG_ERROR,
57 "Packet went out of bounds: position (%i,%i) size %i\n",
59 return AVERROR_INVALIDDATA;
63 int n = FFMIN(count, w - x);
64 bytestream2_get_buffer(&s->gb, dst, n * depth);
76 bytestream2_get_buffer(&s->gb, tmp, depth);
78 int n = FFMIN(count, w - x);
82 memcpy(dst, tmp, depth);
96 static int decode_frame(AVCodecContext *avctx,
97 void *data, int *data_size,
100 TargaContext * const s = avctx->priv_data;
101 AVFrame *picture = data;
102 AVFrame * const p = &s->picture;
105 int idlen, compr, y, w, h, bpp, flags;
106 int first_clr, colors, csize;
108 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
110 /* parse image header */
111 idlen = bytestream2_get_byte(&s->gb);
112 bytestream2_skip(&s->gb, 1); /* pal */
113 compr = bytestream2_get_byte(&s->gb);
114 first_clr = bytestream2_get_le16(&s->gb);
115 colors = bytestream2_get_le16(&s->gb);
116 csize = bytestream2_get_byte(&s->gb);
117 bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
118 w = bytestream2_get_le16(&s->gb);
119 h = bytestream2_get_le16(&s->gb);
120 bpp = bytestream2_get_byte(&s->gb);
121 flags = bytestream2_get_byte(&s->gb);
122 // skip identifier if any
123 bytestream2_skip(&s->gb, idlen);
127 avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
130 avctx->pix_fmt = PIX_FMT_RGB555LE;
133 avctx->pix_fmt = PIX_FMT_RGB555LE;
136 avctx->pix_fmt = PIX_FMT_BGR24;
139 avctx->pix_fmt = PIX_FMT_BGRA;
142 av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
146 if(s->picture.data[0])
147 avctx->release_buffer(avctx, &s->picture);
149 if(av_image_check_size(w, h, 0, avctx))
151 if(w != avctx->width || h != avctx->height)
152 avcodec_set_dimensions(avctx, w, h);
153 if(avctx->get_buffer(avctx, p) < 0){
154 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
159 stride = p->linesize[0];
160 }else{ //image is upside-down
161 dst = p->data[0] + p->linesize[0] * (h - 1);
162 stride = -p->linesize[0];
166 int pal_size, pal_sample_size;
167 if((colors + first_clr) > 256){
168 av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
172 case 24: pal_sample_size = 3; break;
174 case 15: pal_sample_size = 2; break;
176 av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
179 pal_size = colors * pal_sample_size;
180 if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
181 bytestream2_skip(&s->gb, pal_size);
184 uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
186 if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
187 av_log(avctx, AV_LOG_ERROR,
188 "Not enough data to read palette\n");
189 return AVERROR_INVALIDDATA;
191 switch (pal_sample_size) {
194 for (t = 0; t < colors; t++)
195 *pal++ = bytestream2_get_le24u(&s->gb);
199 for (t = 0; t < colors; t++) {
200 uint32_t v = bytestream2_get_le16u(&s->gb);
201 v = ((v & 0x7C00) << 9) |
202 ((v & 0x03E0) << 6) |
204 /* left bit replication */
205 v |= (v & 0xE0E0E0U) >> 5;
210 p->palette_has_changed = 1;
213 if ((compr & (~TGA_RLE)) == TGA_NODATA) {
214 memset(p->data[0], 0, p->linesize[0] * h);
217 int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp);
221 size_t img_size = w * ((bpp + 1) >> 3);
222 if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
223 av_log(avctx, AV_LOG_ERROR,
224 "Not enough data available for image\n");
225 return AVERROR_INVALIDDATA;
227 for (y = 0; y < h; y++) {
228 bytestream2_get_bufferu(&s->gb, dst, img_size);
234 *picture = s->picture;
235 *data_size = sizeof(AVPicture);
240 static av_cold int targa_init(AVCodecContext *avctx){
241 TargaContext *s = avctx->priv_data;
243 avcodec_get_frame_defaults(&s->picture);
244 avctx->coded_frame = &s->picture;
249 static av_cold int targa_end(AVCodecContext *avctx){
250 TargaContext *s = avctx->priv_data;
252 if(s->picture.data[0])
253 avctx->release_buffer(avctx, &s->picture);
258 AVCodec ff_targa_decoder = {
260 .type = AVMEDIA_TYPE_VIDEO,
261 .id = CODEC_ID_TARGA,
262 .priv_data_size = sizeof(TargaContext),
265 .decode = decode_frame,
266 .capabilities = CODEC_CAP_DR1,
267 .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),