FFmpeg: libavcodec/dsicinvideo.c Source File

FFmpeg
dsicinvideo.c
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1 /*
2  * Delphine Software International CIN video decoder
3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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  * Delphine Software International CIN video decoder
25  */
26 
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 
32  typedef enum CinVideoBitmapIndex {
33   CIN_CUR_BMP = 0, /* current */
34   CIN_PRE_BMP = 1, /* previous */
35   CIN_INT_BMP = 2 /* intermediate */
36 } CinVideoBitmapIndex;
37 
38  typedef struct CinVideoContext {
39   AVCodecContext *avctx;
40   AVFrame *frame;
41   unsigned int bitmap_size;
42   uint32_t palette[256];
43   uint8_t *bitmap_table[3];
44 } CinVideoContext;
45 
46  static av_cold void destroy_buffers(CinVideoContext *cin)
47 {
48  int i;
49 
50  for (i = 0; i < 3; ++i)
51  av_freep(&cin->bitmap_table[i]);
52 }
53 
54  static av_cold int allocate_buffers(CinVideoContext *cin)
55 {
56  int i;
57 
58  for (i = 0; i < 3; ++i) {
59  cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
60  if (!cin->bitmap_table[i]) {
61  av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
62  return AVERROR(ENOMEM);
63  }
64  }
65 
66  return 0;
67 }
68 
69  static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
70 {
71  CinVideoContext *cin = avctx->priv_data;
72 
73  cin->avctx = avctx;
74  avctx->pix_fmt = AV_PIX_FMT_PAL8;
75 
76  cin->frame = av_frame_alloc();
77  if (!cin->frame)
78  return AVERROR(ENOMEM);
79 
80  cin->bitmap_size = avctx->width * avctx->height;
81  if (allocate_buffers(cin))
82  return AVERROR(ENOMEM);
83 
84  return 0;
85 }
86 
87  static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
88  int size)
89 {
90  while (size--)
91  *dst++ += *src++;
92 }
93 
94  static int cin_decode_huffman(const unsigned char *src, int src_size,
95  unsigned char *dst, int dst_size)
96 {
97  int b, huff_code = 0;
98  unsigned char huff_code_table[15];
99  unsigned char *dst_cur = dst;
100  unsigned char *dst_end = dst + dst_size;
101  const unsigned char *src_end = src + src_size;
102 
103  memcpy(huff_code_table, src, 15);
104  src += 15;
105 
106  while (src < src_end) {
107  huff_code = *src++;
108  if ((huff_code >> 4) == 15) {
109  b = huff_code << 4;
110  huff_code = *src++;
111  *dst_cur++ = b | (huff_code >> 4);
112  } else
113  *dst_cur++ = huff_code_table[huff_code >> 4];
114  if (dst_cur >= dst_end)
115  break;
116 
117  huff_code &= 15;
118  if (huff_code == 15) {
119  *dst_cur++ = *src++;
120  } else
121  *dst_cur++ = huff_code_table[huff_code];
122  if (dst_cur >= dst_end)
123  break;
124  }
125 
126  return dst_cur - dst;
127 }
128 
129  static int cin_decode_lzss(const unsigned char *src, int src_size,
130  unsigned char *dst, int dst_size)
131 {
132  uint16_t cmd;
133  int i, sz, offset, code;
134  unsigned char *dst_end = dst + dst_size, *dst_start = dst;
135  const unsigned char *src_end = src + src_size;
136 
137  while (src < src_end && dst < dst_end) {
138  code = *src++;
139  for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
140  if (code & (1 << i)) {
141  *dst++ = *src++;
142  } else {
143  cmd = AV_RL16(src);
144  src += 2;
145  offset = cmd >> 4;
146  if ((int)(dst - dst_start) < offset + 1)
147  return AVERROR_INVALIDDATA;
148  sz = (cmd & 0xF) + 2;
149  /* don't use memcpy/memmove here as the decoding routine
150  * (ab)uses buffer overlappings to repeat bytes in the
151  * destination */
152  sz = FFMIN(sz, dst_end - dst);
153  while (sz--) {
154  *dst = *(dst - offset - 1);
155  ++dst;
156  }
157  }
158  }
159  }
160 
161  if (dst_end - dst > dst_size - dst_size/10)
162  return AVERROR_INVALIDDATA;
163 
164  return 0;
165 }
166 
167  static int cin_decode_rle(const unsigned char *src, int src_size,
168  unsigned char *dst, int dst_size)
169 {
170  int len, code;
171  unsigned char *dst_end = dst + dst_size;
172  const unsigned char *src_end = src + src_size;
173 
174  while (src + 1 < src_end && dst < dst_end) {
175  code = *src++;
176  if (code & 0x80) {
177  len = code - 0x7F;
178  memset(dst, *src++, FFMIN(len, dst_end - dst));
179  } else {
180  len = code + 1;
181  if (len > src_end-src) {
182  av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
183  return AVERROR_INVALIDDATA;
184  }
185  memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
186  src += len;
187  }
188  dst += len;
189  }
190 
191  if (dst_end - dst > dst_size - dst_size/10)
192  return AVERROR_INVALIDDATA;
193 
194  return 0;
195 }
196 
197  static int cinvideo_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
198  int *got_frame, AVPacket *avpkt)
199 {
200  const uint8_t *buf = avpkt->data;
201  int buf_size = avpkt->size;
202  CinVideoContext *cin = avctx->priv_data;
203  int i, y, palette_type, palette_colors_count,
204  bitmap_frame_type, bitmap_frame_size, res = 0;
205 
206  palette_type = buf[0];
207  palette_colors_count = AV_RL16(buf + 1);
208  bitmap_frame_type = buf[3];
209  buf += 4;
210 
211  bitmap_frame_size = buf_size - 4;
212 
213  /* handle palette */
214  if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
215  return AVERROR_INVALIDDATA;
216  if (palette_type == 0) {
217  if (palette_colors_count > 256)
218  return AVERROR_INVALIDDATA;
219  for (i = 0; i < palette_colors_count; ++i) {
220  cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
221  bitmap_frame_size -= 3;
222  }
223  } else {
224  for (i = 0; i < palette_colors_count; ++i) {
225  cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
226  buf += 4;
227  bitmap_frame_size -= 4;
228  }
229  }
230 
231  /* note: the decoding routines below assumes that
232  * surface.width = surface.pitch */
233  switch (bitmap_frame_type) {
234  case 9:
235  res = cin_decode_rle(buf, bitmap_frame_size,
236  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
237  if (res < 0)
238  return res;
239  break;
240  case 34:
241  res = cin_decode_rle(buf, bitmap_frame_size,
242  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
243  if (res < 0)
244  return res;
245  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
246  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
247  break;
248  case 35:
249  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
250  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
251  res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
252  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
253  if (res < 0)
254  return res;
255  break;
256  case 36:
257  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
258  cin->bitmap_table[CIN_INT_BMP],
259  cin->bitmap_size);
260  res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
261  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
262  if (res < 0)
263  return res;
264  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
265  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
266  break;
267  case 37:
268  res = cin_decode_huffman(buf, bitmap_frame_size,
269  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
270 
271  if (cin->bitmap_size - avctx->discard_damaged_percentage*cin->bitmap_size/100 > res)
272  return AVERROR_INVALIDDATA;
273  break;
274  case 38:
275  res = cin_decode_lzss(buf, bitmap_frame_size,
276  cin->bitmap_table[CIN_CUR_BMP],
277  cin->bitmap_size);
278  if (res < 0)
279  return res;
280  break;
281  case 39:
282  res = cin_decode_lzss(buf, bitmap_frame_size,
283  cin->bitmap_table[CIN_CUR_BMP],
284  cin->bitmap_size);
285  if (res < 0)
286  return res;
287  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
288  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
289  break;
290  }
291 
292  if ((res = ff_reget_buffer(avctx, cin->frame, 0)) < 0)
293  return res;
294 
295  memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
296  cin->frame->palette_has_changed = 1;
297  for (y = 0; y < cin->avctx->height; ++y)
298  memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
299  cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
300  cin->avctx->width);
301 
302  FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
303  cin->bitmap_table[CIN_PRE_BMP]);
304 
305  if ((res = av_frame_ref(rframe, cin->frame)) < 0)
306  return res;
307 
308  *got_frame = 1;
309 
310  return buf_size;
311 }
312 
313  static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
314 {
315  CinVideoContext *cin = avctx->priv_data;
316 
317  av_frame_free(&cin->frame);
318 
319  destroy_buffers(cin);
320 
321  return 0;
322 }
323 
324  const FFCodec ff_dsicinvideo_decoder = {
325  .p.name = "dsicinvideo",
326  CODEC_LONG_NAME("Delphine Software International CIN video"),
327  .p.type = AVMEDIA_TYPE_VIDEO,
328  .p.id = AV_CODEC_ID_DSICINVIDEO,
329  .priv_data_size = sizeof(CinVideoContext),
330  .init = cinvideo_decode_init,
331  .close = cinvideo_decode_end,
332  FF_CODEC_DECODE_CB(cinvideo_decode_frame),
333  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
334  .p.capabilities = AV_CODEC_CAP_DR1,
335 };
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
AVERROR
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:99
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
AVPacket::data
uint8_t * data
Definition: packet.h:374
b
#define b
Definition: input.c:41
FFCodec
Definition: codec_internal.h:127
CinVideoContext
Definition: dsicinvideo.c:38
destroy_buffers
static av_cold void destroy_buffers(CinVideoContext *cin)
Definition: dsicinvideo.c:46
AV_CODEC_ID_DSICINVIDEO
@ AV_CODEC_ID_DSICINVIDEO
Definition: codec_id.h:146
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:351
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:87
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
cin_apply_delta_data
static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
Definition: dsicinvideo.c:87
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
CinVideoBitmapIndex
CinVideoBitmapIndex
Definition: dsicinvideo.c:32
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:365
decode.h
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
CinVideoContext::bitmap_table
uint8_t * bitmap_table[3]
Definition: dsicinvideo.c:43
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
NULL
#define NULL
Definition: coverity.c:32
CIN_PRE_BMP
@ CIN_PRE_BMP
Definition: dsicinvideo.c:34
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
cinvideo_decode_end
static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
Definition: dsicinvideo.c:313
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:344
codec_internal.h
ff_dsicinvideo_decoder
const FFCodec ff_dsicinvideo_decoder
Definition: dsicinvideo.c:324
size
int size
Definition: twinvq_data.h:10344
AV_RL24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:93
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
cin_decode_rle
static int cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
Definition: dsicinvideo.c:167
CIN_CUR_BMP
@ CIN_CUR_BMP
Definition: dsicinvideo.c:33
CinVideoContext::bitmap_size
unsigned int bitmap_size
Definition: dsicinvideo.c:41
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
cinvideo_decode_init
static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
Definition: dsicinvideo.c:69
FFMIN3
#define FFMIN3(a, b, c)
Definition: macros.h:50
allocate_buffers
static av_cold int allocate_buffers(CinVideoContext *cin)
Definition: dsicinvideo.c:54
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:254
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:191
len
int len
Definition: vorbis_enc_data.h:426
AVCodecContext::height
int height
Definition: avcodec.h:598
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:635
CinVideoContext::frame
AVFrame * frame
Definition: dsicinvideo.c:40
avcodec.h
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1591
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
U
#define U(x)
Definition: vpx_arith.h:37
AVCodecContext
main external API structure.
Definition: avcodec.h:426
cin_decode_lzss
static int cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
Definition: dsicinvideo.c:129
AVFrame::palette_has_changed
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:496
AVCodecContext::discard_damaged_percentage
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:1986
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
CinVideoContext::avctx
AVCodecContext * avctx
Definition: dsicinvideo.c:39
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:453
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
CIN_INT_BMP
@ CIN_INT_BMP
Definition: dsicinvideo.c:35
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:598
bytestream.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:375
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
cinvideo_decode_frame
static int cinvideo_decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
Definition: dsicinvideo.c:197
CinVideoContext::palette
uint32_t palette[256]
Definition: dsicinvideo.c:42
cin_decode_huffman
static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
Definition: dsicinvideo.c:94
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