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pictordec.c
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1 /*
2  * Pictor/PC Paint decoder
3  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
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 /**
23  * @file
24  * Pictor/PC Paint decoder
25  */
26 
27 #include "libavutil/imgutils.h"
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "cga_data.h"
31 #include "internal.h"
32 
33 typedef struct PicContext {
34  int width, height;
35  int nb_planes;
37 } PicContext;
38 
39 static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
40  int *x, int *y)
41 {
42  while (run > 0) {
43  uint8_t *d = frame->data[0] + *y * frame->linesize[0];
44  if (*x + run >= s->width) {
45  int n = s->width - *x;
46  memset(d + *x, value, n);
47  run -= n;
48  *x = 0;
49  *y -= 1;
50  if (*y < 0)
51  break;
52  } else {
53  memset(d + *x, value, run);
54  *x += run;
55  break;
56  }
57  }
58 }
59 
60 static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
61  int *x, int *y, int *plane, int bits_per_plane)
62 {
63  uint8_t *d;
64  int shift = *plane * bits_per_plane;
65  int mask = ((1 << bits_per_plane) - 1) << shift;
66  value <<= shift;
67 
68  while (run > 0) {
69  int j;
70  for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
71  d = frame->data[0] + *y * frame->linesize[0];
72  d[*x] |= (value >> j) & mask;
73  *x += 1;
74  if (*x == s->width) {
75  *y -= 1;
76  *x = 0;
77  if (*y < 0) {
78  *y = s->height - 1;
79  *plane += 1;
80  value <<= bits_per_plane;
81  mask <<= bits_per_plane;
82  if (*plane >= s->nb_planes)
83  break;
84  }
85  }
86  }
87  run--;
88  }
89 }
90 
91 static const uint8_t cga_mode45_index[6][4] = {
92  [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
93  [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
94  [2] = { 0, 3, 4, 7 }, // mode5, low intensity
95  [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
96  [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
97  [5] = { 0, 11, 12, 15 }, // mode5, high intensity
98 };
99 
100 static int decode_frame(AVCodecContext *avctx,
101  void *data, int *got_frame,
102  AVPacket *avpkt)
103 {
104  PicContext *s = avctx->priv_data;
105  AVFrame *frame = data;
106  uint32_t *palette;
107  int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
108  int i, x, y, plane, tmp, ret, val;
109 
110  bytestream2_init(&s->g, avpkt->data, avpkt->size);
111 
112  if (bytestream2_get_bytes_left(&s->g) < 11)
113  return AVERROR_INVALIDDATA;
114 
115  if (bytestream2_get_le16u(&s->g) != 0x1234)
116  return AVERROR_INVALIDDATA;
117 
118  s->width = bytestream2_get_le16u(&s->g);
119  s->height = bytestream2_get_le16u(&s->g);
120  bytestream2_skip(&s->g, 4);
121  tmp = bytestream2_get_byteu(&s->g);
122  bits_per_plane = tmp & 0xF;
123  s->nb_planes = (tmp >> 4) + 1;
124  bpp = bits_per_plane * s->nb_planes;
125  if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
126  avpriv_request_sample(avctx, "Unsupported bit depth");
127  return AVERROR_PATCHWELCOME;
128  }
129 
130  if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
131  bytestream2_skip(&s->g, 2);
132  etype = bytestream2_get_le16(&s->g);
133  esize = bytestream2_get_le16(&s->g);
134  if (bytestream2_get_bytes_left(&s->g) < esize)
135  return AVERROR_INVALIDDATA;
136  } else {
137  etype = -1;
138  esize = 0;
139  }
140 
141  avctx->pix_fmt = AV_PIX_FMT_PAL8;
142 
143  if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
144  return -1;
145  if (s->width != avctx->width && s->height != avctx->height) {
146  ret = ff_set_dimensions(avctx, s->width, s->height);
147  if (ret < 0)
148  return ret;
149  }
150 
151  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
152  return ret;
153  memset(frame->data[0], 0, s->height * frame->linesize[0]);
154  frame->pict_type = AV_PICTURE_TYPE_I;
155  frame->palette_has_changed = 1;
156 
157  pos_after_pal = bytestream2_tell(&s->g) + esize;
158  palette = (uint32_t*)frame->data[1];
159  if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
160  int idx = bytestream2_get_byte(&s->g);
161  npal = 4;
162  for (i = 0; i < npal; i++)
163  palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
164  } else if (etype == 2) {
165  npal = FFMIN(esize, 16);
166  for (i = 0; i < npal; i++) {
167  int pal_idx = bytestream2_get_byte(&s->g);
168  palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
169  }
170  } else if (etype == 3) {
171  npal = FFMIN(esize, 16);
172  for (i = 0; i < npal; i++) {
173  int pal_idx = bytestream2_get_byte(&s->g);
174  palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
175  }
176  } else if (etype == 4 || etype == 5) {
177  npal = FFMIN(esize / 3, 256);
178  for (i = 0; i < npal; i++) {
179  palette[i] = bytestream2_get_be24(&s->g) << 2;
180  palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
181  }
182  } else {
183  if (bpp == 1) {
184  npal = 2;
185  palette[0] = 0xFF000000;
186  palette[1] = 0xFFFFFFFF;
187  } else if (bpp == 2) {
188  npal = 4;
189  for (i = 0; i < npal; i++)
190  palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
191  } else {
192  npal = 16;
193  memcpy(palette, ff_cga_palette, npal * 4);
194  }
195  }
196  // fill remaining palette entries
197  memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
198  // skip remaining palette bytes
199  bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
200 
201  val = 0;
202  y = s->height - 1;
203  if (bytestream2_get_le16(&s->g)) {
204  x = 0;
205  plane = 0;
206  while (bytestream2_get_bytes_left(&s->g) >= 6) {
207  int stop_size, marker, t1, t2;
208 
209  t1 = bytestream2_get_bytes_left(&s->g);
210  t2 = bytestream2_get_le16(&s->g);
211  stop_size = t1 - FFMIN(t1, t2);
212  // ignore uncompressed block size
213  bytestream2_skip(&s->g, 2);
214  marker = bytestream2_get_byte(&s->g);
215 
216  while (plane < s->nb_planes &&
217  bytestream2_get_bytes_left(&s->g) > stop_size) {
218  int run = 1;
219  val = bytestream2_get_byte(&s->g);
220  if (val == marker) {
221  run = bytestream2_get_byte(&s->g);
222  if (run == 0)
223  run = bytestream2_get_le16(&s->g);
224  val = bytestream2_get_byte(&s->g);
225  }
226  if (!bytestream2_get_bytes_left(&s->g))
227  break;
228 
229  if (bits_per_plane == 8) {
230  picmemset_8bpp(s, frame, val, run, &x, &y);
231  if (y < 0)
232  goto finish;
233  } else {
234  picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
235  }
236  }
237  }
238 
239  if (x < avctx->width) {
240  int run = (y + 1) * avctx->width - x;
241  if (bits_per_plane == 8)
242  picmemset_8bpp(s, frame, val, run, &x, &y);
243  else
244  picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
245  }
246  } else {
247  while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
248  memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
249  bytestream2_skip(&s->g, avctx->width);
250  y--;
251  }
252  }
253 finish:
254 
255  *got_frame = 1;
256  return avpkt->size;
257 }
258 
260  .name = "pictor",
261  .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
262  .type = AVMEDIA_TYPE_VIDEO,
263  .id = AV_CODEC_ID_PICTOR,
264  .priv_data_size = sizeof(PicContext),
265  .decode = decode_frame,
266  .capabilities = AV_CODEC_CAP_DR1,
267 };
int plane
Definition: avisynth_c.h:291
const char const char void * val
Definition: avisynth_c.h:634
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int shift(int a, int b)
Definition: sonic.c:82
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run, int *x, int *y)
Definition: pictordec.c:39
misc image utilities
int width
Definition: pictordec.c:34
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
int size
Definition: avcodec.h:1578
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1870
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static void picmemset(PicContext *s, AVFrame *frame, int value, int run, int *x, int *y, int *plane, int bits_per_plane)
Definition: pictordec.c:60
uint8_t run
Definition: svq3.c:192
AVCodec.
Definition: avcodec.h:3535
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static const uint8_t cga_mode45_index[6][4]
Definition: pictordec.c:91
uint8_t
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1577
const uint8_t * buffer
Definition: bytestream.h:34
CGA/EGA/VGA ROM data.
GetByteContext g
Definition: pictordec.c:36
static const uint16_t mask[17]
Definition: lzw.c:38
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
#define t1
Definition: regdef.h:29
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
const char * name
Name of the codec implementation.
Definition: avcodec.h:3542
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:251
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:254
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1829
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
static uint8_t tmp[8]
Definition: des-test.c:38
#define width
int n
Definition: avisynth_c.h:547
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
Libavcodec external API header.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: pictordec.c:100
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:211
static void finish(void)
Definition: movenc-test.c:299
main external API structure.
Definition: avcodec.h:1642
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:928
AVCodec ff_pictor_decoder
Definition: pictordec.c:259
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:324
int height
Definition: pictordec.c:34
const uint32_t ff_cga_palette[16]
Definition: cga_data.c:30
const uint32_t ff_ega_palette[64]
Definition: cga_data.c:35
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:722
int palette
Definition: v4l.c:61
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
void * priv_data
Definition: avcodec.h:1684
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:208
int nb_planes
Definition: pictordec.c:35
This structure stores compressed data.
Definition: avcodec.h:1554
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:953
#define t2
Definition: regdef.h:30