FFmpeg  2.1.1
motionpixels.c
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1 /*
2  * Motion Pixels Video Decoder
3  * Copyright (c) 2008 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 #include "avcodec.h"
23 #include "get_bits.h"
24 #include "dsputil.h"
25 #include "internal.h"
26 
27 #define MAX_HUFF_CODES 16
28 
29 #include "motionpixels_tablegen.h"
30 
31 typedef struct HuffCode {
32  int code;
35 } HuffCode;
36 
37 typedef struct MotionPixelsContext {
52 
54 {
55  MotionPixelsContext *mp = avctx->priv_data;
56  int w4 = (avctx->width + 3) & ~3;
57  int h4 = (avctx->height + 3) & ~3;
58 
59  if(avctx->extradata_size < 2){
60  av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
61  return AVERROR_INVALIDDATA;
62  }
63 
65  mp->avctx = avctx;
66  ff_dsputil_init(&mp->dsp, avctx);
67  mp->changes_map = av_mallocz(avctx->width * h4);
68  mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
69  mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
70  mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
71  if (!mp->changes_map || !mp->vpt || !mp->hpt) {
72  av_freep(&mp->changes_map);
73  av_freep(&mp->vpt);
74  av_freep(&mp->hpt);
75  return AVERROR(ENOMEM);
76  }
77  avctx->pix_fmt = AV_PIX_FMT_RGB555;
79  return 0;
80 }
81 
82 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
83 {
84  uint16_t *pixels;
85  int offset, w, h, color = 0, x, y, i;
86 
87  while (count--) {
88  offset = get_bits_long(gb, mp->offset_bits_len);
89  w = get_bits(gb, bits_len) + 1;
90  h = get_bits(gb, bits_len) + 1;
91  if (read_color)
92  color = get_bits(gb, 15);
93  x = offset % mp->avctx->width;
94  y = offset / mp->avctx->width;
95  if (y >= mp->avctx->height)
96  continue;
97  w = FFMIN(w, mp->avctx->width - x);
98  h = FFMIN(h, mp->avctx->height - y);
99  pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
100  while (h--) {
101  mp->changes_map[offset] = w;
102  if (read_color)
103  for (i = 0; i < w; ++i)
104  pixels[i] = color;
105  offset += mp->avctx->width;
106  pixels += mp->frame.linesize[0] / 2;
107  }
108  }
109 }
110 
111 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
112 {
113  while (get_bits1(gb)) {
114  ++size;
115  if (size > mp->max_codes_bits) {
116  av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
117  return AVERROR_INVALIDDATA;
118  }
119  code <<= 1;
120  if (mp_get_code(mp, gb, size, code + 1) < 0)
121  return AVERROR_INVALIDDATA;
122  }
123  if (mp->current_codes_count >= MAX_HUFF_CODES) {
124  av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
125  return AVERROR_INVALIDDATA;
126  }
127 
128  mp->codes[mp->current_codes_count ].code = code;
129  mp->codes[mp->current_codes_count++].size = size;
130  return 0;
131 }
132 
134 {
135  if (mp->codes_count == 1) {
136  mp->codes[0].delta = get_bits(gb, 4);
137  } else {
138  int i;
139  int ret;
140 
141  mp->max_codes_bits = get_bits(gb, 4);
142  for (i = 0; i < mp->codes_count; ++i)
143  mp->codes[i].delta = get_bits(gb, 4);
144  mp->current_codes_count = 0;
145  if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
146  return ret;
147  if (mp->current_codes_count < mp->codes_count) {
148  av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
149  return AVERROR_INVALIDDATA;
150  }
151  }
152  return 0;
153 }
154 
155 static int mp_gradient(MotionPixelsContext *mp, int component, int v)
156 {
157  int delta;
158 
159  delta = (v - 7) * mp->gradient_scale[component];
160  mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
161  return delta;
162 }
163 
165 {
166  int color;
167 
168  color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
169  return mp_rgb_yuv_table[color];
170 }
171 
172 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
173 {
174  int color;
175 
176  color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
177  *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
178 }
179 
181 {
182  int i;
183 
184  i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
185  return mp->codes[i].delta;
186 }
187 
189 {
190  YuvPixel p;
191  const int y0 = y * mp->avctx->width;
192  int w, i, x = 0;
193 
194  p = mp->vpt[y];
195  if (mp->changes_map[y0 + x] == 0) {
196  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
197  ++x;
198  }
199  while (x < mp->avctx->width) {
200  w = mp->changes_map[y0 + x];
201  if (w != 0) {
202  if ((y & 3) == 0) {
203  if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
204  mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
205  mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
206  for (i = (x + 3) & ~3; i < x + w; i += 4) {
207  mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
208  }
209  }
210  }
211  x += w;
212  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
213  p = mp_get_yuv_from_rgb(mp, x - 1, y);
214  } else {
215  p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
216  p.y = av_clip(p.y, 0, 31);
217  if ((x & 3) == 0) {
218  if ((y & 3) == 0) {
219  p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
220  p.v = av_clip(p.v, -32, 31);
221  p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
222  p.u = av_clip(p.u, -32, 31);
223  mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
224  } else {
225  p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
226  p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
227  }
228  }
229  mp_set_rgb_from_yuv(mp, x, y, &p);
230  ++x;
231  }
232  }
233 }
234 
236 {
237  YuvPixel p;
238  int y, y0;
239 
240  av_assert1(mp->changes_map[0]);
241 
242  for (y = 0; y < mp->avctx->height; ++y) {
243  if (mp->changes_map[y * mp->avctx->width] != 0) {
244  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
245  p = mp_get_yuv_from_rgb(mp, 0, y);
246  } else {
247  p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
248  p.y = av_clip(p.y, 0, 31);
249  if ((y & 3) == 0) {
250  p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
251  p.v = av_clip(p.v, -32, 31);
252  p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
253  p.u = av_clip(p.u, -32, 31);
254  }
255  mp->vpt[y] = p;
256  mp_set_rgb_from_yuv(mp, 0, y, &p);
257  }
258  }
259  for (y0 = 0; y0 < 2; ++y0)
260  for (y = y0; y < mp->avctx->height; y += 2)
261  mp_decode_line(mp, gb, y);
262 }
263 
264 static int mp_decode_frame(AVCodecContext *avctx,
265  void *data, int *got_frame,
266  AVPacket *avpkt)
267 {
268  const uint8_t *buf = avpkt->data;
269  int buf_size = avpkt->size;
270  MotionPixelsContext *mp = avctx->priv_data;
271  GetBitContext gb;
272  int i, count1, count2, sz, ret;
273 
274  if ((ret = ff_reget_buffer(avctx, &mp->frame)) < 0)
275  return ret;
276 
277  /* le32 bitstream msb first */
279  if (!mp->bswapbuf)
280  return AVERROR(ENOMEM);
281  mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
282  if (buf_size & 3)
283  memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
284  memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
285  init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
286 
287  memset(mp->changes_map, 0, avctx->width * avctx->height);
288  for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
289  count1 = get_bits(&gb, 12);
290  count2 = get_bits(&gb, 12);
291  mp_read_changes_map(mp, &gb, count1, 8, i);
292  mp_read_changes_map(mp, &gb, count2, 4, i);
293  }
294 
295  mp->codes_count = get_bits(&gb, 4);
296  if (mp->codes_count == 0)
297  goto end;
298 
299  if (mp->changes_map[0] == 0) {
300  *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
301  mp->changes_map[0] = 1;
302  }
303  if (mp_read_codes_table(mp, &gb) < 0)
304  goto end;
305 
306  sz = get_bits(&gb, 18);
307  if (avctx->extradata[0] != 5)
308  sz += get_bits(&gb, 18);
309  if (sz == 0)
310  goto end;
311 
312  if (mp->max_codes_bits <= 0)
313  goto end;
314  if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
315  goto end;
316  mp_decode_frame_helper(mp, &gb);
317  ff_free_vlc(&mp->vlc);
318 
319 end:
320  if ((ret = av_frame_ref(data, &mp->frame)) < 0)
321  return ret;
322  *got_frame = 1;
323  return buf_size;
324 }
325 
327 {
328  MotionPixelsContext *mp = avctx->priv_data;
329 
330  av_freep(&mp->changes_map);
331  av_freep(&mp->vpt);
332  av_freep(&mp->hpt);
333  av_freep(&mp->bswapbuf);
334  av_frame_unref(&mp->frame);
335 
336  return 0;
337 }
338 
340  .name = "motionpixels",
341  .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
342  .type = AVMEDIA_TYPE_VIDEO,
344  .priv_data_size = sizeof(MotionPixelsContext),
345  .init = mp_decode_init,
346  .close = mp_decode_end,
348  .capabilities = CODEC_CAP_DR1,
349 };
float v
av_cold void ff_dsputil_init(DSPContext *c, AVCodecContext *avctx)
Definition: dsputil.c:2678
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
uint8_t size
Definition: motionpixels.c:33
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:255
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVCodec ff_motionpixels_decoder
Definition: motionpixels.c:339
int size
Definition: avcodec.h:1064
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: utils.c:153
uint8_t delta
Definition: motionpixels.c:34
uint8_t
#define AV_PIX_FMT_RGB555
Definition: avcodec.h:4938
float delta
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:83
static const uint8_t offset[511][2]
Definition: vf_uspp.c:58
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
int av_frame_ref(AVFrame *dst, AVFrame *src)
Setup a new reference to the data described by a given frame.
Definition: frame.c:247
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:742
const char data[16]
Definition: mxf.c:68
static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
Definition: motionpixels.c:164
bitstream reader API header.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: dsputil.h:205
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
Libavcodec external API header.
Definition: get_bits.h:63
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:580
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:986
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:351
float y
static int mp_yuv_to_rgb(int y, int v, int u, int clip_rgb)
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
AVCodecContext * avctx
Definition: motionpixels.c:38
static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
Definition: motionpixels.c:111
#define FFMIN(a, b)
Definition: avcodec.h:925
static int mp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: motionpixels.c:264
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:550
uint8_t * changes_map
Definition: motionpixels.c:41
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:235
static av_cold int mp_decode_init(AVCodecContext *avctx)
Definition: motionpixels.c:53
main external API structure.
Definition: avcodec.h:1146
HuffCode codes[MAX_HUFF_CODES]
Definition: motionpixels.c:45
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:452
void * buf
Definition: avisynth_c.h:594
int extradata_size
Definition: avcodec.h:1255
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
void avcodec_get_frame_defaults(AVFrame *frame)
Set the fields of the given AVFrame to default values.
Definition: utils.c:1046
uint8_t * data
Definition: avcodec.h:1063
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:405
static int mp_gradient(MotionPixelsContext *mp, int component, int v)
Definition: motionpixels.c:155
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
void * priv_data
Definition: avcodec.h:1182
static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:180
uint8_t gradient_scale[3]
Definition: motionpixels.c:48
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
Definition: motionpixels.c:188
common internal api header.
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
Definition: motionpixels.c:82
#define MAX_HUFF_CODES
Definition: motionpixels.c:27
DSP utils.
#define AVERROR_INVALIDDATA
static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
Definition: motionpixels.c:172
static av_cold int mp_decode_end(AVCodecContext *avctx)
Definition: motionpixels.c:326
#define av_log2
Definition: intmath.h:89
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:133
#define AVERROR(e)
static YuvPixel mp_rgb_yuv_table[1<< 15]
void INT64 INT64 count
Definition: avisynth_c.h:594
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
static void motionpixels_tableinit(void)
This structure stores compressed data.
Definition: avcodec.h:1040
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:353
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241
DSPContext.
Definition: dsputil.h:124