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ffv1.c
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1 /*
2  * FFV1 codec for libavcodec
3  *
4  * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * FF Video Codec 1 (a lossless codec)
26  */
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/avassert.h"
30 #include "libavutil/crc.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/timer.h"
35 
36 #include "avcodec.h"
37 #include "internal.h"
38 #include "rangecoder.h"
39 #include "golomb.h"
40 #include "mathops.h"
41 #include "ffv1.h"
42 
44 {
45  FFV1Context *s = avctx->priv_data;
46 
47  if (!avctx->width || !avctx->height)
48  return AVERROR_INVALIDDATA;
49 
50  s->avctx = avctx;
51  s->flags = avctx->flags;
52 
53  s->picture.f = av_frame_alloc();
55  if (!s->picture.f || !s->last_picture.f)
56  return AVERROR(ENOMEM);
57 
58  s->width = avctx->width;
59  s->height = avctx->height;
60 
61  // defaults
62  s->num_h_slices = 1;
63  s->num_v_slices = 1;
64 
65  return 0;
66 }
67 
69 {
70  int j, i;
71 
72  fs->plane_count = f->plane_count;
73  fs->transparency = f->transparency;
74  for (j = 0; j < f->plane_count; j++) {
75  PlaneContext *const p = &fs->plane[j];
76 
77  if (fs->ac != AC_GOLOMB_RICE) {
78  if (!p->state)
80  sizeof(uint8_t));
81  if (!p->state)
82  return AVERROR(ENOMEM);
83  } else {
84  if (!p->vlc_state) {
86  if (!p->vlc_state)
87  return AVERROR(ENOMEM);
88  for (i = 0; i < p->context_count; i++) {
89  p->vlc_state[i].error_sum = 4;
90  p->vlc_state[i].count = 1;
91  }
92  }
93  }
94  }
95 
96  if (fs->ac == AC_RANGE_CUSTOM_TAB) {
97  //FIXME only redo if state_transition changed
98  for (j = 1; j < 256; j++) {
99  fs->c. one_state[ j] = f->state_transition[j];
100  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
101  }
102  }
103 
104  return 0;
105 }
106 
108 {
109  int i, ret;
110  for (i = 0; i < f->max_slice_count; i++) {
111  FFV1Context *fs = f->slice_context[i];
112  if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
113  return AVERROR(ENOMEM);
114  }
115  return 0;
116 }
117 
119 {
120  int i;
121 
123  av_assert0(f->max_slice_count > 0);
124 
125  for (i = 0; i < f->max_slice_count; i++) {
126  int sx = i % f->num_h_slices;
127  int sy = i / f->num_h_slices;
128  int sxs = f->avctx->width * sx / f->num_h_slices;
129  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
130  int sys = f->avctx->height * sy / f->num_v_slices;
131  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
132  FFV1Context *fs = av_mallocz(sizeof(*fs));
133 
134  if (!fs)
135  goto memfail;
136 
137  f->slice_context[i] = fs;
138  memcpy(fs, f, sizeof(*fs));
139  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
140 
141  fs->slice_width = sxe - sxs;
142  fs->slice_height = sye - sys;
143  fs->slice_x = sxs;
144  fs->slice_y = sys;
145 
146  fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
147  sizeof(*fs->sample_buffer));
148  if (!fs->sample_buffer) {
149  av_freep(&f->slice_context[i]);
150  goto memfail;
151  }
152  }
153  return 0;
154 
155 memfail:
156  while(--i >= 0) {
158  av_freep(&f->slice_context[i]);
159  }
160  return AVERROR(ENOMEM);
161 }
162 
164 {
165  int i;
166 
167  for (i = 0; i < f->quant_table_count; i++) {
169  sizeof(*f->initial_states[i]));
170  if (!f->initial_states[i])
171  return AVERROR(ENOMEM);
172  memset(f->initial_states[i], 128,
173  f->context_count[i] * sizeof(*f->initial_states[i]));
174  }
175  return 0;
176 }
177 
179 {
180  int i, j;
181 
182  for (i = 0; i < f->plane_count; i++) {
183  PlaneContext *p = &fs->plane[i];
184 
185  p->interlace_bit_state[0] = 128;
186  p->interlace_bit_state[1] = 128;
187 
188  if (fs->ac != AC_GOLOMB_RICE) {
189  if (f->initial_states[p->quant_table_index]) {
190  memcpy(p->state, f->initial_states[p->quant_table_index],
192  } else
193  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
194  } else {
195  for (j = 0; j < p->context_count; j++) {
196  p->vlc_state[j].drift = 0;
197  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
198  p->vlc_state[j].bias = 0;
199  p->vlc_state[j].count = 1;
200  }
201  }
202  }
203 }
204 
205 
207 {
208  FFV1Context *s = avctx->priv_data;
209  int i, j;
210 
211  if (s->picture.f)
212  ff_thread_release_buffer(avctx, &s->picture);
213  av_frame_free(&s->picture.f);
214 
215  if (s->last_picture.f)
218 
219  for (j = 0; j < s->max_slice_count; j++) {
220  FFV1Context *fs = s->slice_context[j];
221  for (i = 0; i < s->plane_count; i++) {
222  PlaneContext *p = &fs->plane[i];
223 
224  av_freep(&p->state);
225  av_freep(&p->vlc_state);
226  }
227  av_freep(&fs->sample_buffer);
228  }
229 
230  av_freep(&avctx->stats_out);
231  for (j = 0; j < s->quant_table_count; j++) {
232  av_freep(&s->initial_states[j]);
233  for (i = 0; i < s->max_slice_count; i++) {
234  FFV1Context *sf = s->slice_context[i];
235  av_freep(&sf->rc_stat2[j]);
236  }
237  av_freep(&s->rc_stat2[j]);
238  }
239 
240  for (i = 0; i < s->max_slice_count; i++)
241  av_freep(&s->slice_context[i]);
242 
243  return 0;
244 }
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int flags
Definition: ffv1.h:93
misc image utilities
AVFrame * f
Definition: thread.h:36
int quant_table_count
Definition: ffv1.h:123
int slice_height
Definition: ffv1.h:131
int16_t * sample_buffer
Definition: ffv1.h:111
uint8_t zero_state[256]
Definition: rangecoder.h:40
Range coder.
uint64_t(*[MAX_QUANT_TABLES] rc_stat2)[32][2]
Definition: ffv1.h:86
FF Video Codec 1 (a lossless codec)
int height
Definition: ffv1.h:89
uint8_t one_state[256]
Definition: rangecoder.h:41
Macro definitions for various function/variable attributes.
int plane_count
Definition: ffv1.h:100
ThreadFrame picture
Definition: ffv1.h:96
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:140
AVOptions.
int8_t bias
Definition: ffv1.h:64
RangeCoder c
Definition: ffv1.h:82
av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:43
int slice_y
Definition: ffv1.h:133
uint8_t(*[MAX_QUANT_TABLES] initial_states)[32]
Definition: ffv1.h:108
ThreadFrame last_picture
Definition: ffv1.h:96
av_cold int ff_ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:206
uint8_t count
Definition: ffv1.h:65
VlcState * vlc_state
Definition: ffv1.h:73
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2816
high precision timer, useful to profile code
int slice_width
Definition: ffv1.h:130
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
Definition: ffv1.c:107
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:153
int context_count
Definition: ffv1.h:71
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1743
simple assert() macros that are a bit more flexible than ISO C assert().
int ff_ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:163
int ac
1=range coder <-> 0=golomb rice
Definition: ffv1.h:101
#define AC_RANGE_CUSTOM_TAB
Definition: ffv1.h:58
Definition: ffv1.h:61
uint8_t state_transition[256]
Definition: ffv1.h:107
int num_h_slices
Definition: ffv1.h:129
int width
picture width / height.
Definition: avcodec.h:1835
#define MAX_PLANES
Definition: ffv1.h:50
int max_slice_count
Definition: ffv1.h:127
av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:118
av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:68
int16_t drift
Definition: ffv1.h:62
int context_count[MAX_QUANT_TABLES]
Definition: ffv1.h:106
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1648
#define AC_GOLOMB_RICE
Definition: ffv1.h:56
uint16_t error_sum
Definition: ffv1.h:63
#define CONTEXT_SIZE
Definition: ffv1.h:51
int quant_table_index
Definition: ffv1.h:70
common internal api header.
void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:178
uint8_t(* state)[CONTEXT_SIZE]
Definition: ffv1.h:72
void * priv_data
Definition: avcodec.h:1690
PlaneContext plane[MAX_PLANES]
Definition: ffv1.h:103
int transparency
Definition: ffv1.h:92
struct FFV1Context * slice_context[MAX_SLICES]
Definition: ffv1.h:125
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
uint8_t interlace_bit_state[2]
Definition: ffv1.h:74
#define av_freep(p)
#define av_malloc_array(a, b)
int num_v_slices
Definition: ffv1.h:128
exp golomb vlc stuff
AVCodecContext * avctx
Definition: ffv1.h:81
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int slice_x
Definition: ffv1.h:132
int width
Definition: ffv1.h:89