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targa.c
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1 /*
2  * Targa (.tga) image decoder
3  * Copyright (c) 2006 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "internal.h"
27 #include "targa.h"
28 
29 typedef struct TargaContext {
31 } TargaContext;
32 
34  int stride, int *y, int h, int interleave)
35 {
36  *y += interleave;
37 
38  if (*y < h) {
39  return line + interleave * stride;
40  } else {
41  *y = (*y + 1) & (interleave - 1);
42  if (*y && *y < h) {
43  return start + *y * stride;
44  } else {
45  return NULL;
46  }
47  }
48 }
49 
51  uint8_t *start, int w, int h, int stride,
52  int bpp, int interleave)
53 {
54  int x, y;
55  int depth = (bpp + 1) >> 3;
56  int type, count;
57  uint8_t *line = start;
58  uint8_t *dst = line;
59 
60  x = y = count = 0;
61  while (dst) {
62  if (bytestream2_get_bytes_left(&s->gb) <= 0) {
63  av_log(avctx, AV_LOG_ERROR,
64  "Ran ouf of data before end-of-image\n");
65  return AVERROR_INVALIDDATA;
66  }
67  type = bytestream2_get_byteu(&s->gb);
68  count = (type & 0x7F) + 1;
69  type &= 0x80;
70  if (!type) {
71  do {
72  int n = FFMIN(count, w - x);
73  bytestream2_get_buffer(&s->gb, dst, n * depth);
74  count -= n;
75  dst += n * depth;
76  x += n;
77  if (x == w) {
78  x = 0;
79  dst = line = advance_line(start, line, stride, &y, h, interleave);
80  }
81  } while (dst && count > 0);
82  } else {
83  uint8_t tmp[4];
84  bytestream2_get_buffer(&s->gb, tmp, depth);
85  do {
86  int n = FFMIN(count, w - x);
87  count -= n;
88  x += n;
89  do {
90  memcpy(dst, tmp, depth);
91  dst += depth;
92  } while (--n);
93  if (x == w) {
94  x = 0;
95  dst = line = advance_line(start, line, stride, &y, h, interleave);
96  }
97  } while (dst && count > 0);
98  }
99  }
100 
101  if (count) {
102  av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
103  return AVERROR_INVALIDDATA;
104  }
105 
106  return 0;
107 }
108 
109 static int decode_frame(AVCodecContext *avctx,
110  void *data, int *got_frame,
111  AVPacket *avpkt)
112 {
113  TargaContext * const s = avctx->priv_data;
114  AVFrame * const p = data;
115  uint8_t *dst;
116  int stride;
117  int idlen, pal, compr, y, w, h, bpp, flags, ret;
118  int first_clr, colors, csize;
119  int interleave;
120 
121  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
122 
123  /* parse image header */
124  idlen = bytestream2_get_byte(&s->gb);
125  pal = bytestream2_get_byte(&s->gb);
126  compr = bytestream2_get_byte(&s->gb);
127  first_clr = bytestream2_get_le16(&s->gb);
128  colors = bytestream2_get_le16(&s->gb);
129  csize = bytestream2_get_byte(&s->gb);
130  bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
131  w = bytestream2_get_le16(&s->gb);
132  h = bytestream2_get_le16(&s->gb);
133  bpp = bytestream2_get_byte(&s->gb);
134 
135  if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
136  av_log(avctx, AV_LOG_ERROR,
137  "Not enough data to read header\n");
138  return AVERROR_INVALIDDATA;
139  }
140 
141  flags = bytestream2_get_byte(&s->gb);
142 
143  if (!pal && (first_clr || colors || csize)) {
144  av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
145  // specification says we should ignore those value in this case
146  first_clr = colors = csize = 0;
147  }
148 
149  // skip identifier if any
150  bytestream2_skip(&s->gb, idlen);
151 
152  switch (bpp) {
153  case 8:
154  avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
155  break;
156  case 15:
157  case 16:
158  avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
159  break;
160  case 24:
161  avctx->pix_fmt = AV_PIX_FMT_BGR24;
162  break;
163  case 32:
164  avctx->pix_fmt = AV_PIX_FMT_BGRA;
165  break;
166  default:
167  av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
168  return AVERROR_INVALIDDATA;
169  }
170 
171  if (colors && (colors + first_clr) > 256) {
172  av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
173  return AVERROR_INVALIDDATA;
174  }
175 
176  if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
177  return ret;
178 
179  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
180  return ret;
182 
183  if (flags & TGA_TOPTOBOTTOM) {
184  dst = p->data[0];
185  stride = p->linesize[0];
186  } else { //image is upside-down
187  dst = p->data[0] + p->linesize[0] * (h - 1);
188  stride = -p->linesize[0];
189  }
190 
191  interleave = flags & TGA_INTERLEAVE2 ? 2 :
192  flags & TGA_INTERLEAVE4 ? 4 : 1;
193 
194  if (colors) {
195  int pal_size, pal_sample_size;
196 
197  switch (csize) {
198  case 32: pal_sample_size = 4; break;
199  case 24: pal_sample_size = 3; break;
200  case 16:
201  case 15: pal_sample_size = 2; break;
202  default:
203  av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
204  return AVERROR_INVALIDDATA;
205  }
206  pal_size = colors * pal_sample_size;
207  if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
208  bytestream2_skip(&s->gb, pal_size);
209  else {
210  int t;
211  uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
212 
213  if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
214  av_log(avctx, AV_LOG_ERROR,
215  "Not enough data to read palette\n");
216  return AVERROR_INVALIDDATA;
217  }
218  switch (pal_sample_size) {
219  case 4:
220  for (t = 0; t < colors; t++)
221  *pal++ = bytestream2_get_le32u(&s->gb);
222  break;
223  case 3:
224  /* RGB24 */
225  for (t = 0; t < colors; t++)
226  *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
227  break;
228  case 2:
229  /* RGB555 */
230  for (t = 0; t < colors; t++) {
231  uint32_t v = bytestream2_get_le16u(&s->gb);
232  v = ((v & 0x7C00) << 9) |
233  ((v & 0x03E0) << 6) |
234  ((v & 0x001F) << 3);
235  /* left bit replication */
236  v |= (v & 0xE0E0E0U) >> 5;
237  *pal++ = (0xffU<<24) | v;
238  }
239  break;
240  }
241  p->palette_has_changed = 1;
242  }
243  }
244 
245  if ((compr & (~TGA_RLE)) == TGA_NODATA) {
246  memset(p->data[0], 0, p->linesize[0] * h);
247  } else {
248  if (compr & TGA_RLE) {
249  int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
250  if (res < 0)
251  return res;
252  } else {
253  size_t img_size = w * ((bpp + 1) >> 3);
254  uint8_t *line;
255  if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
256  av_log(avctx, AV_LOG_ERROR,
257  "Not enough data available for image\n");
258  return AVERROR_INVALIDDATA;
259  }
260 
261  line = dst;
262  y = 0;
263  do {
264  bytestream2_get_buffer(&s->gb, line, img_size);
265  line = advance_line(dst, line, stride, &y, h, interleave);
266  } while (line);
267  }
268  }
269 
270  if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
271  int x;
272  for (y = 0; y < h; y++) {
273  void *line = &p->data[0][y * p->linesize[0]];
274  for (x = 0; x < w >> 1; x++) {
275  switch (bpp) {
276  case 32:
277  FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
278  break;
279  case 24:
280  FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
281  FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
282  FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
283  break;
284  case 16:
285  FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
286  break;
287  case 8:
288  FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
289  }
290  }
291  }
292  }
293 
294  *got_frame = 1;
295 
296  return avpkt->size;
297 }
298 
300  .name = "targa",
301  .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
302  .type = AVMEDIA_TYPE_VIDEO,
303  .id = AV_CODEC_ID_TARGA,
304  .priv_data_size = sizeof(TargaContext),
305  .decode = decode_frame,
306  .capabilities = AV_CODEC_CAP_DR1,
307 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:190
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
Definition: targa.h:37
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:210
Definition: targa.h:38
packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, X=unused/undefined ...
Definition: pixfmt.h:116
int size
Definition: avcodec.h:1608
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1910
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
AVCodec.
Definition: avcodec.h:3607
targa file common definitions
static uint8_t * advance_line(uint8_t *start, uint8_t *line, int stride, int *y, int h, int interleave)
Definition: targa.c:33
uint8_t
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
uint8_t * data
Definition: avcodec.h:1607
static int flags
Definition: log.c:57
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: targa.c:109
#define av_log(a,...)
#define U(x)
Definition: vp56_arith.h:37
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:96
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
Definition: graph2dot.c:48
const char * name
Name of the codec implementation.
Definition: avcodec.h:3614
GLsizei count
Definition: opengl_enc.c:109
int depth
Definition: v4l.c:62
GetByteContext gb
Definition: targa.c:30
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:264
#define FFMIN(a, b)
Definition: common.h:96
int n
Definition: avisynth_c.h:684
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:221
AVCodec ff_targa_decoder
Definition: targa.c:299
main external API structure.
Definition: avcodec.h:1682
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:948
GLint GLenum type
Definition: opengl_enc.c:105
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:338
static void interleave(short *output, short **input, int channels, int samples)
Definition: resample.c:161
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:204
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, uint8_t *start, int w, int h, int stride, int bpp, int interleave)
Definition: targa.c:50
Y , 8bpp.
Definition: pixfmt.h:70
common internal api header.
void * priv_data
Definition: avcodec.h:1724
static uint8_t tmp[8]
Definition: des.c:38
void INT64 start
Definition: avisynth_c.h:690
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
#define FFSWAP(type, a, b)
Definition: common.h:99
#define stride
This structure stores compressed data.
Definition: avcodec.h:1584
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959