2 * Targa (.tga) image decoder
3 * Copyright (c) 2006 Konstantin Shishkov
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/imgutils.h"
25 #include "bytestream.h"
29 typedef struct TargaContext {
34 static uint8_t *advance_line(uint8_t *start, uint8_t *line,
35 int stride, int *y, int h, int interleave)
40 return line + interleave * stride;
42 *y = (*y + 1) & (interleave - 1);
44 return start + *y * stride;
51 static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
52 uint8_t *start, int w, int h, int stride,
53 int bpp, int interleave)
56 int depth = (bpp + 1) >> 3;
58 uint8_t *line = start;
63 if (bytestream2_get_bytes_left(&s->gb) <= 0) {
64 av_log(avctx, AV_LOG_ERROR,
65 "Ran ouf of data before end-of-image\n");
66 return AVERROR_INVALIDDATA;
68 type = bytestream2_get_byteu(&s->gb);
69 count = (type & 0x7F) + 1;
73 int n = FFMIN(count, w - x);
74 bytestream2_get_buffer(&s->gb, dst, n * depth);
80 dst = line = advance_line(start, line, stride, &y, h, interleave);
82 } while (dst && count > 0);
85 bytestream2_get_buffer(&s->gb, tmp, depth);
87 int n = FFMIN(count, w - x);
91 memcpy(dst, tmp, depth);
96 dst = line = advance_line(start, line, stride, &y, h, interleave);
98 } while (dst && count > 0);
103 av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
104 return AVERROR_INVALIDDATA;
110 static int decode_frame(AVCodecContext *avctx,
111 void *data, int *got_frame,
114 TargaContext * const s = avctx->priv_data;
115 AVFrame *picture = data;
116 AVFrame * const p = &s->picture;
119 int idlen, pal, compr, y, w, h, bpp, flags, ret;
120 int first_clr, colors, csize;
123 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
125 /* parse image header */
126 idlen = bytestream2_get_byte(&s->gb);
127 pal = bytestream2_get_byte(&s->gb);
128 compr = bytestream2_get_byte(&s->gb);
129 first_clr = bytestream2_get_le16(&s->gb);
130 colors = bytestream2_get_le16(&s->gb);
131 csize = bytestream2_get_byte(&s->gb);
132 bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
133 w = bytestream2_get_le16(&s->gb);
134 h = bytestream2_get_le16(&s->gb);
135 bpp = bytestream2_get_byte(&s->gb);
137 if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
138 av_log(avctx, AV_LOG_ERROR,
139 "Not enough data to read header\n");
140 return AVERROR_INVALIDDATA;
143 flags = bytestream2_get_byte(&s->gb);
145 if (!pal && (first_clr || colors || csize)) {
146 av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
147 // specification says we should ignore those value in this case
148 first_clr = colors = csize = 0;
151 // skip identifier if any
152 bytestream2_skip(&s->gb, idlen);
156 avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
160 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
163 avctx->pix_fmt = AV_PIX_FMT_BGR24;
166 avctx->pix_fmt = AV_PIX_FMT_BGRA;
169 av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
170 return AVERROR_INVALIDDATA;
173 if (s->picture.data[0])
174 avctx->release_buffer(avctx, &s->picture);
176 if (colors && (colors + first_clr) > 256) {
177 av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
178 return AVERROR_INVALIDDATA;
181 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
183 if (w != avctx->width || h != avctx->height)
184 avcodec_set_dimensions(avctx, w, h);
185 if ((ret = ff_get_buffer(avctx, p)) < 0) {
186 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
190 if (flags & TGA_TOPTOBOTTOM) {
192 stride = p->linesize[0];
193 } else { //image is upside-down
194 dst = p->data[0] + p->linesize[0] * (h - 1);
195 stride = -p->linesize[0];
198 interleave = flags & TGA_INTERLEAVE2 ? 2 :
199 flags & TGA_INTERLEAVE4 ? 4 : 1;
202 int pal_size, pal_sample_size;
205 case 32: pal_sample_size = 4; break;
206 case 24: pal_sample_size = 3; break;
208 case 15: pal_sample_size = 2; break;
210 av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
211 return AVERROR_INVALIDDATA;
213 pal_size = colors * pal_sample_size;
214 if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
215 bytestream2_skip(&s->gb, pal_size);
218 uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
220 if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
221 av_log(avctx, AV_LOG_ERROR,
222 "Not enough data to read palette\n");
223 return AVERROR_INVALIDDATA;
225 switch (pal_sample_size) {
227 for (t = 0; t < colors; t++)
228 *pal++ = bytestream2_get_le32u(&s->gb);
232 for (t = 0; t < colors; t++)
233 *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
237 for (t = 0; t < colors; t++) {
238 uint32_t v = bytestream2_get_le16u(&s->gb);
239 v = ((v & 0x7C00) << 9) |
240 ((v & 0x03E0) << 6) |
242 /* left bit replication */
243 v |= (v & 0xE0E0E0U) >> 5;
244 *pal++ = (0xffU<<24) | v;
248 p->palette_has_changed = 1;
252 if ((compr & (~TGA_RLE)) == TGA_NODATA) {
253 memset(p->data[0], 0, p->linesize[0] * h);
255 if (compr & TGA_RLE) {
256 int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
260 size_t img_size = w * ((bpp + 1) >> 3);
262 if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
263 av_log(avctx, AV_LOG_ERROR,
264 "Not enough data available for image\n");
265 return AVERROR_INVALIDDATA;
271 bytestream2_get_buffer(&s->gb, line, img_size);
272 line = advance_line(dst, line, stride, &y, h, interleave);
277 if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
279 for (y = 0; y < h; y++) {
280 void *line = &p->data[0][y * p->linesize[0]];
281 for (x = 0; x < w >> 1; x++) {
284 FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
287 FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
288 FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
289 FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
292 FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
295 FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
301 *picture = s->picture;
307 static av_cold int targa_init(AVCodecContext *avctx)
309 TargaContext *s = avctx->priv_data;
311 avcodec_get_frame_defaults(&s->picture);
312 avctx->coded_frame = &s->picture;
317 static av_cold int targa_end(AVCodecContext *avctx)
319 TargaContext *s = avctx->priv_data;
321 if (s->picture.data[0])
322 avctx->release_buffer(avctx, &s->picture);
327 AVCodec ff_targa_decoder = {
329 .type = AVMEDIA_TYPE_VIDEO,
330 .id = AV_CODEC_ID_TARGA,
331 .priv_data_size = sizeof(TargaContext),
334 .decode = decode_frame,
335 .capabilities = CODEC_CAP_DR1,
336 .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),