FFmpeg
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ffv1.c
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1 /*
2  * FFV1 codec for libavcodec
3  *
4  * Copyright (c) 2003-2012 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 #include "avcodec.h"
36 #include "internal.h"
37 #include "rangecoder.h"
38 #include "golomb.h"
39 #include "mathops.h"
40 #include "ffv1.h"
41 
43 {
44  FFV1Context *s = avctx->priv_data;
45 
46  if (!avctx->width || !avctx->height)
47  return AVERROR_INVALIDDATA;
48 
49  s->avctx = avctx;
50  s->flags = avctx->flags;
51 
54  if (!s->picture.f || !s->last_picture.f)
55  return AVERROR(ENOMEM);
56  ff_dsputil_init(&s->dsp, avctx);
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;
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) {
78  if (!p->state)
80  sizeof(uint8_t));
81  if (!p->state)
82  return AVERROR(ENOMEM);
83  } else {
84  if (!p->vlc_state)
85  p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
86  if (!p->vlc_state)
87  return AVERROR(ENOMEM);
88  }
89  }
90 
91  if (fs->ac > 1) {
92  //FIXME only redo if state_transition changed
93  for (j = 1; j < 256; j++) {
94  fs->c. one_state[ j] = f->state_transition[j];
95  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
96  }
97  }
98 
99  return 0;
100 }
101 
103 {
104  int i, ret;
105  for (i = 0; i < f->slice_count; i++) {
106  FFV1Context *fs = f->slice_context[i];
107  if ((ret = ffv1_init_slice_state(f, fs)) < 0)
108  return AVERROR(ENOMEM);
109  }
110  return 0;
111 }
112 
114 {
115  int i;
116 
118  av_assert0(f->slice_count > 0);
119 
120  for (i = 0; i < f->slice_count; i++) {
121  FFV1Context *fs = av_mallocz(sizeof(*fs));
122  int sx = i % f->num_h_slices;
123  int sy = i / f->num_h_slices;
124  int sxs = f->avctx->width * sx / f->num_h_slices;
125  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
126  int sys = f->avctx->height * sy / f->num_v_slices;
127  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
128 
129  if (!fs)
130  return AVERROR(ENOMEM);
131 
132  f->slice_context[i] = fs;
133  memcpy(fs, f, sizeof(*fs));
134  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
135 
136  fs->slice_width = sxe - sxs;
137  fs->slice_height = sye - sys;
138  fs->slice_x = sxs;
139  fs->slice_y = sys;
140 
141  fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
142  sizeof(*fs->sample_buffer));
143  if (!fs->sample_buffer)
144  return AVERROR(ENOMEM);
145  }
146  return 0;
147 }
148 
150 {
151  int i;
152 
153  for (i = 0; i < f->quant_table_count; i++) {
154  f->initial_states[i] = av_malloc(f->context_count[i] *
155  sizeof(*f->initial_states[i]));
156  if (!f->initial_states[i])
157  return AVERROR(ENOMEM);
158  memset(f->initial_states[i], 128,
159  f->context_count[i] * sizeof(*f->initial_states[i]));
160  }
161  return 0;
162 }
163 
165 {
166  int i, j;
167 
168  for (i = 0; i < f->plane_count; i++) {
169  PlaneContext *p = &fs->plane[i];
170 
171  p->interlace_bit_state[0] = 128;
172  p->interlace_bit_state[1] = 128;
173 
174  if (fs->ac) {
175  if (f->initial_states[p->quant_table_index]) {
176  memcpy(p->state, f->initial_states[p->quant_table_index],
178  } else
179  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
180  } else {
181  for (j = 0; j < p->context_count; j++) {
182  p->vlc_state[j].drift = 0;
183  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
184  p->vlc_state[j].bias = 0;
185  p->vlc_state[j].count = 1;
186  }
187  }
188  }
189 }
190 
191 
193 {
194  FFV1Context *s = avctx->priv_data;
195  int i, j;
196 
197  if (s->picture.f)
198  ff_thread_release_buffer(avctx, &s->picture);
199  av_frame_free(&s->picture.f);
200 
201  if (s->last_picture.f)
204 
205  for (j = 0; j < s->slice_count; j++) {
206  FFV1Context *fs = s->slice_context[j];
207  for (i = 0; i < s->plane_count; i++) {
208  PlaneContext *p = &fs->plane[i];
209 
210  av_freep(&p->state);
211  av_freep(&p->vlc_state);
212  }
213  av_freep(&fs->sample_buffer);
214  }
215 
216  av_freep(&avctx->stats_out);
217  for (j = 0; j < s->quant_table_count; j++) {
218  av_freep(&s->initial_states[j]);
219  for (i = 0; i < s->slice_count; i++) {
220  FFV1Context *sf = s->slice_context[i];
221  av_freep(&sf->rc_stat2[j]);
222  }
223  av_freep(&s->rc_stat2[j]);
224  }
225 
226  for (i = 0; i < s->slice_count; i++)
227  av_freep(&s->slice_context[i]);
228 
229  return 0;
230 }