1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* FF Video Codec 1 (a lossless codec)
*/
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timer.h"
#include "avcodec.h"
#include "internal.h"
#include "rangecoder.h"
#include "golomb.h"
#include "mathops.h"
#include "ffv1.h"
av_cold int ffv1_common_init(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
if (!avctx->width || !avctx->height)
return AVERROR_INVALIDDATA;
s->avctx = avctx;
s->flags = avctx->flags;
avcodec_get_frame_defaults(&s->picture);
ff_dsputil_init(&s->dsp, avctx);
s->width = avctx->width;
s->height = avctx->height;
// defaults
s->num_h_slices = 1;
s->num_v_slices = 1;
return 0;
}
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
{
int j;
fs->plane_count = f->plane_count;
fs->transparency = f->transparency;
for (j = 0; j < f->plane_count; j++) {
PlaneContext *const p = &fs->plane[j];
if (fs->ac) {
if (!p->state)
p->state = av_malloc(CONTEXT_SIZE * p->context_count *
sizeof(uint8_t));
if (!p->state)
return AVERROR(ENOMEM);
} else {
if (!p->vlc_state)
p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
if (!p->vlc_state)
return AVERROR(ENOMEM);
}
}
if (fs->ac > 1) {
//FIXME only redo if state_transition changed
for (j = 1; j < 256; j++) {
fs->c. one_state[ j] = f->state_transition[j];
fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
}
}
return 0;
}
int ffv1_init_slices_state(FFV1Context *f)
{
int i, ret;
for (i = 0; i < f->slice_count; i++) {
FFV1Context *fs = f->slice_context[i];
if ((ret = ffv1_init_slice_state(f, fs)) < 0)
return AVERROR(ENOMEM);
}
return 0;
}
av_cold int ffv1_init_slice_contexts(FFV1Context *f)
{
int i;
f->slice_count = f->num_h_slices * f->num_v_slices;
av_assert0(f->slice_count > 0);
for (i = 0; i < f->slice_count; i++) {
FFV1Context *fs = av_mallocz(sizeof(*fs));
int sx = i % f->num_h_slices;
int sy = i / f->num_h_slices;
int sxs = f->avctx->width * sx / f->num_h_slices;
int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
int sys = f->avctx->height * sy / f->num_v_slices;
int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
if (!fs)
return AVERROR(ENOMEM);
f->slice_context[i] = fs;
memcpy(fs, f, sizeof(*fs));
memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
fs->slice_width = sxe - sxs;
fs->slice_height = sye - sys;
fs->slice_x = sxs;
fs->slice_y = sys;
fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
sizeof(*fs->sample_buffer));
if (!fs->sample_buffer)
return AVERROR(ENOMEM);
}
return 0;
}
int ffv1_allocate_initial_states(FFV1Context *f)
{
int i;
for (i = 0; i < f->quant_table_count; i++) {
f->initial_states[i] = av_malloc(f->context_count[i] *
sizeof(*f->initial_states[i]));
if (!f->initial_states[i])
return AVERROR(ENOMEM);
memset(f->initial_states[i], 128,
f->context_count[i] * sizeof(*f->initial_states[i]));
}
return 0;
}
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
{
int i, j;
for (i = 0; i < f->plane_count; i++) {
PlaneContext *p = &fs->plane[i];
p->interlace_bit_state[0] = 128;
p->interlace_bit_state[1] = 128;
if (fs->ac) {
if (f->initial_states[p->quant_table_index]) {
memcpy(p->state, f->initial_states[p->quant_table_index],
CONTEXT_SIZE * p->context_count);
} else
memset(p->state, 128, CONTEXT_SIZE * p->context_count);
} else {
for (j = 0; j < p->context_count; j++) {
p->vlc_state[j].drift = 0;
p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
p->vlc_state[j].bias = 0;
p->vlc_state[j].count = 1;
}
}
}
}
av_cold int ffv1_close(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i, j;
if (avctx->codec->decode && s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
if (avctx->codec->decode && s->last_picture.data[0])
avctx->release_buffer(avctx, &s->last_picture);
for (j = 0; j < s->slice_count; j++) {
FFV1Context *fs = s->slice_context[j];
for (i = 0; i < s->plane_count; i++) {
PlaneContext *p = &fs->plane[i];
av_freep(&p->state);
av_freep(&p->vlc_state);
}
av_freep(&fs->sample_buffer);
}
av_freep(&avctx->stats_out);
for (j = 0; j < s->quant_table_count; j++) {
av_freep(&s->initial_states[j]);
for (i = 0; i < s->slice_count; i++) {
FFV1Context *sf = s->slice_context[i];
av_freep(&sf->rc_stat2[j]);
}
av_freep(&s->rc_stat2[j]);
}
for (i = 0; i < s->slice_count; i++)
av_freep(&s->slice_context[i]);
return 0;
}
|
