FFmpeg  4.4.4
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 "libavutil/thread.h"
23 
24 #include "config.h"
25 
26 #include "avcodec.h"
27 #include "get_bits.h"
28 #include "bswapdsp.h"
29 #include "internal.h"
30 
31 #define MAX_HUFF_CODES 16
32 
33 #include "motionpixels_tablegen.h"
34 
35 typedef struct HuffCode {
38 } HuffCode;
39 
40 typedef struct MotionPixelsContext {
55 
57 {
58  MotionPixelsContext *mp = avctx->priv_data;
59 
60  av_freep(&mp->changes_map);
61  av_freep(&mp->vpt);
62  av_freep(&mp->hpt);
63  av_freep(&mp->bswapbuf);
64  av_frame_free(&mp->frame);
65 
66  return 0;
67 }
68 
70 {
71  av_unused static AVOnce init_static_once = AV_ONCE_INIT;
72  MotionPixelsContext *mp = avctx->priv_data;
73  int w4 = (avctx->width + 3) & ~3;
74  int h4 = (avctx->height + 3) & ~3;
75 
76  if(avctx->extradata_size < 2){
77  av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
78  return AVERROR_INVALIDDATA;
79  }
80 
81  mp->avctx = avctx;
82  ff_bswapdsp_init(&mp->bdsp);
83  mp->changes_map = av_mallocz_array(avctx->width, h4);
84  mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
85  mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
86  mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
87  if (!mp->changes_map || !mp->vpt || !mp->hpt)
88  return AVERROR(ENOMEM);
89  avctx->pix_fmt = AV_PIX_FMT_RGB555;
90 
91  mp->frame = av_frame_alloc();
92  if (!mp->frame)
93  return AVERROR(ENOMEM);
94 
95 #if !CONFIG_HARDCODED_TABLES
96  ff_thread_once(&init_static_once, motionpixels_tableinit);
97 #endif
98 
99  return 0;
100 }
101 
102 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
103 {
104  uint16_t *pixels;
105  int offset, w, h, color = 0, x, y, i;
106 
107  while (count--) {
109  w = get_bits(gb, bits_len) + 1;
110  h = get_bits(gb, bits_len) + 1;
111  if (read_color)
112  color = get_bits(gb, 15);
113  x = offset % mp->avctx->width;
114  y = offset / mp->avctx->width;
115  if (y >= mp->avctx->height)
116  continue;
117  w = FFMIN(w, mp->avctx->width - x);
118  h = FFMIN(h, mp->avctx->height - y);
119  pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
120  while (h--) {
121  mp->changes_map[offset] = w;
122  if (read_color)
123  for (i = 0; i < w; ++i)
124  pixels[i] = color;
125  offset += mp->avctx->width;
126  pixels += mp->frame->linesize[0] / 2;
127  }
128  }
129 }
130 
132 {
133  while (get_bits1(gb)) {
134  ++size;
135  if (size > mp->max_codes_bits) {
136  av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
137  return AVERROR_INVALIDDATA;
138  }
139  if (mp_get_code(mp, gb, size) < 0)
140  return AVERROR_INVALIDDATA;
141  }
142  if (mp->current_codes_count >= mp->codes_count) {
143  av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
144  return AVERROR_INVALIDDATA;
145  }
146 
147  mp->codes[mp->current_codes_count++].size = size;
148  return 0;
149 }
150 
152 {
153  if (mp->codes_count == 1) {
154  mp->codes[0].delta = get_bits(gb, 4);
155  } else {
156  int i;
157  int ret;
158 
159  mp->max_codes_bits = get_bits(gb, 4);
160  for (i = 0; i < mp->codes_count; ++i)
161  mp->codes[i].delta = get_bits(gb, 4);
162  mp->current_codes_count = 0;
163  if ((ret = mp_get_code(mp, gb, 0)) < 0)
164  return ret;
165  if (mp->current_codes_count < mp->codes_count) {
166  av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
167  return AVERROR_INVALIDDATA;
168  }
169  }
170  return 0;
171 }
172 
173 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
174 {
175  int delta;
176 
177  delta = (v - 7) * mp->gradient_scale[component];
178  mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
179  return delta;
180 }
181 
183 {
184  int color;
185 
186  color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
187  return mp_rgb_yuv_table[color & 0x7FFF];
188 }
189 
190 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
191 {
192  int color;
193 
194  color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
195  *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
196 }
197 
199 {
200  return mp->vlc.table ? get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1)
201  : mp->codes[0].delta;
202 }
203 
205 {
206  YuvPixel p;
207  const int y0 = y * mp->avctx->width;
208  int w, i, x = 0;
209 
210  p = mp->vpt[y];
211  if (mp->changes_map[y0 + x] == 0) {
212  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
213  ++x;
214  }
215  while (x < mp->avctx->width) {
216  w = mp->changes_map[y0 + x];
217  if (w != 0) {
218  if ((y & 3) == 0) {
219  if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
220  mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
221  mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
222  for (i = (x + 3) & ~3; i < x + w; i += 4) {
223  mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
224  }
225  }
226  }
227  x += w;
228  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
229  p = mp_get_yuv_from_rgb(mp, x - 1, y);
230  } else {
231  p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
232  p.y = av_clip_uintp2(p.y, 5);
233  if ((x & 3) == 0) {
234  if ((y & 3) == 0) {
235  p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
236  p.v = av_clip_intp2(p.v, 5);
237  p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
238  p.u = av_clip_intp2(p.u, 5);
239  mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
240  } else {
241  p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
242  p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
243  }
244  }
245  mp_set_rgb_from_yuv(mp, x, y, &p);
246  ++x;
247  }
248  }
249 }
250 
252 {
253  YuvPixel p;
254  int y, y0;
255 
256  av_assert1(mp->changes_map[0]);
257 
258  for (y = 0; y < mp->avctx->height; ++y) {
259  if (mp->changes_map[y * mp->avctx->width] != 0) {
260  memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
261  p = mp_get_yuv_from_rgb(mp, 0, y);
262  } else {
263  p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
264  p.y = av_clip_uintp2(p.y, 5);
265  if ((y & 3) == 0) {
266  p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
267  p.v = av_clip_intp2(p.v, 5);
268  p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
269  p.u = av_clip_intp2(p.u, 5);
270  }
271  mp->vpt[y] = p;
272  mp_set_rgb_from_yuv(mp, 0, y, &p);
273  }
274  }
275  for (y0 = 0; y0 < 2; ++y0)
276  for (y = y0; y < mp->avctx->height; y += 2)
277  mp_decode_line(mp, gb, y);
278 }
279 
280 static int mp_decode_frame(AVCodecContext *avctx,
281  void *data, int *got_frame,
282  AVPacket *avpkt)
283 {
284  const uint8_t *buf = avpkt->data;
285  int buf_size = avpkt->size;
286  MotionPixelsContext *mp = avctx->priv_data;
287  GetBitContext gb;
288  int i, count1, count2, sz, ret;
289 
290  if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
291  return ret;
292 
293  /* le32 bitstream msb first */
294  av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
295  if (!mp->bswapbuf)
296  return AVERROR(ENOMEM);
297  mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
298  buf_size / 4);
299  if (buf_size & 3)
300  memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
301  init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
302 
303  memset(mp->changes_map, 0, avctx->width * avctx->height);
304  for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
305  count1 = get_bits(&gb, 12);
306  count2 = get_bits(&gb, 12);
307  mp_read_changes_map(mp, &gb, count1, 8, i);
308  mp_read_changes_map(mp, &gb, count2, 4, i);
309  }
310 
311  mp->codes_count = get_bits(&gb, 4);
312  if (mp->codes_count == 0)
313  goto end;
314 
315  if (mp->changes_map[0] == 0) {
316  *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
317  mp->changes_map[0] = 1;
318  }
319  if (mp_read_codes_table(mp, &gb) < 0)
320  goto end;
321 
322  sz = get_bits(&gb, 18);
323  if (avctx->extradata[0] != 5)
324  sz += get_bits(&gb, 18);
325  if (sz == 0)
326  goto end;
327 
328  if (mp->codes_count > 1) {
329  /* The entries of the mp->codes array are sorted from right to left
330  * in the Huffman tree, hence -(int)sizeof(HuffCode). */
332  &mp->codes[mp->codes_count - 1].size, -(int)sizeof(HuffCode),
333  &mp->codes[mp->codes_count - 1].delta, -(int)sizeof(HuffCode), 1,
334  0, 0, avctx);
335  if (ret < 0)
336  goto end;
337  }
338  mp_decode_frame_helper(mp, &gb);
339  ff_free_vlc(&mp->vlc);
340 
341 end:
342  if ((ret = av_frame_ref(data, mp->frame)) < 0)
343  return ret;
344  *got_frame = 1;
345  return buf_size;
346 }
347 
349  .name = "motionpixels",
350  .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
351  .type = AVMEDIA_TYPE_VIDEO,
353  .priv_data_size = sizeof(MotionPixelsContext),
354  .init = mp_decode_init,
355  .close = mp_decode_end,
357  .capabilities = AV_CODEC_CAP_DR1,
359 };
#define av_always_inline
Definition: attributes.h:45
#define av_unused
Definition: attributes.h:131
#define av_cold
Definition: attributes.h:88
uint8_t
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:431
int ff_init_vlc_from_lengths(VLC *vlc_arg, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: bitstream.c:381
#define av_clip_intp2
Definition: common.h:143
#define FFMIN(a, b)
Definition: common.h:105
#define av_clip_uintp2
Definition: common.h:146
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:2007
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
bitstream reader API header.
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
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:797
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_MOTIONPIXELS
Definition: codec_id.h:168
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:50
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
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:443
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:190
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int i
Definition: input.c:407
#define av_log2
Definition: intmath.h:83
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:49
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define AVOnce
Definition: thread.h:172
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
#define AV_ONCE_INIT
Definition: thread.h:173
uint8_t w
Definition: llviddspenc.c:39
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
static av_cold int mp_decode_end(AVCodecContext *avctx)
Definition: motionpixels.c:56
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:251
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
Definition: motionpixels.c:204
AVCodec ff_motionpixels_decoder
Definition: motionpixels.c:348
static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size)
Definition: motionpixels.c:131
static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
Definition: motionpixels.c:190
static int mp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: motionpixels.c:280
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
Definition: motionpixels.c:102
static av_cold int mp_decode_init(AVCodecContext *avctx)
Definition: motionpixels.c:69
static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
Definition: motionpixels.c:173
#define MAX_HUFF_CODES
Definition: motionpixels.c:31
static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:198
static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
Definition: motionpixels.c:151
static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
Definition: motionpixels.c:182
static av_cold void motionpixels_tableinit(void)
static YuvPixel mp_rgb_yuv_table[1<< 15]
static int mp_yuv_to_rgb(int y, int v, int u, int clip_rgb)
const char data[16]
Definition: mxf.c:142
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:387
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
int extradata_size
Definition: avcodec.h:638
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
uint8_t size
Definition: motionpixels.c:36
uint8_t delta
Definition: motionpixels.c:37
HuffCode codes[MAX_HUFF_CODES]
Definition: motionpixels.c:48
BswapDSPContext bdsp
Definition: motionpixels.c:43
uint8_t * changes_map
Definition: motionpixels.c:44
uint8_t gradient_scale[3]
Definition: motionpixels.c:51
AVCodecContext * avctx
Definition: motionpixels.c:41
Definition: vlc.h:26
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
#define av_freep(p)
#define av_log(a,...)
int size
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
float delta