FFmpeg
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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 #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 
52  s->picture.f = av_frame_alloc();
54  if (!s->picture.f || !s->last_picture.f)
55  return AVERROR(ENOMEM);
56 
57  ff_dsputil_init(&s->dsp, avctx);
58 
59  s->width = avctx->width;
60  s->height = avctx->height;
61 
62  // defaults
63  s->num_h_slices = 1;
64  s->num_v_slices = 1;
65 
66  return 0;
67 }
68 
70 {
71  int j;
72 
73  fs->plane_count = f->plane_count;
74  fs->transparency = f->transparency;
75  for (j = 0; j < f->plane_count; j++) {
76  PlaneContext *const p = &fs->plane[j];
77 
78  if (fs->ac) {
79  if (!p->state)
81  sizeof(uint8_t));
82  if (!p->state)
83  return AVERROR(ENOMEM);
84  } else {
85  if (!p->vlc_state)
86  p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
87  if (!p->vlc_state)
88  return AVERROR(ENOMEM);
89  }
90  }
91 
92  if (fs->ac > 1) {
93  //FIXME only redo if state_transition changed
94  for (j = 1; j < 256; j++) {
95  fs->c. one_state[ j] = f->state_transition[j];
96  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
97  }
98  }
99 
100  return 0;
101 }
102 
104 {
105  int i, ret;
106  for (i = 0; i < f->slice_count; i++) {
107  FFV1Context *fs = f->slice_context[i];
108  if ((ret = ffv1_init_slice_state(f, fs)) < 0)
109  return AVERROR(ENOMEM);
110  }
111  return 0;
112 }
113 
115 {
116  int i;
117 
119  av_assert0(f->slice_count > 0);
120 
121  for (i = 0; i < f->slice_count; i++) {
122  FFV1Context *fs = av_mallocz(sizeof(*fs));
123  int sx = i % f->num_h_slices;
124  int sy = i / f->num_h_slices;
125  int sxs = f->avctx->width * sx / f->num_h_slices;
126  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
127  int sys = f->avctx->height * sy / f->num_v_slices;
128  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
129 
130  if (!fs)
131  return AVERROR(ENOMEM);
132 
133  f->slice_context[i] = fs;
134  memcpy(fs, f, sizeof(*fs));
135  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
136 
137  fs->slice_width = sxe - sxs;
138  fs->slice_height = sye - sys;
139  fs->slice_x = sxs;
140  fs->slice_y = sys;
141 
142  fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
143  sizeof(*fs->sample_buffer));
144  if (!fs->sample_buffer)
145  return AVERROR(ENOMEM);
146  }
147  return 0;
148 }
149 
151 {
152  int i;
153 
154  for (i = 0; i < f->quant_table_count; i++) {
155  f->initial_states[i] = av_malloc(f->context_count[i] *
156  sizeof(*f->initial_states[i]));
157  if (!f->initial_states[i])
158  return AVERROR(ENOMEM);
159  memset(f->initial_states[i], 128,
160  f->context_count[i] * sizeof(*f->initial_states[i]));
161  }
162  return 0;
163 }
164 
166 {
167  int i, j;
168 
169  for (i = 0; i < f->plane_count; i++) {
170  PlaneContext *p = &fs->plane[i];
171 
172  p->interlace_bit_state[0] = 128;
173  p->interlace_bit_state[1] = 128;
174 
175  if (fs->ac) {
176  if (f->initial_states[p->quant_table_index]) {
177  memcpy(p->state, f->initial_states[p->quant_table_index],
179  } else
180  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
181  } else {
182  for (j = 0; j < p->context_count; j++) {
183  p->vlc_state[j].drift = 0;
184  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
185  p->vlc_state[j].bias = 0;
186  p->vlc_state[j].count = 1;
187  }
188  }
189  }
190 }
191 
192 
194 {
195  FFV1Context *s = avctx->priv_data;
196  int i, j;
197 
198  if (s->picture.f)
199  ff_thread_release_buffer(avctx, &s->picture);
200  av_frame_free(&s->picture.f);
201 
202  if (s->last_picture.f)
205 
206  for (j = 0; j < s->slice_count; j++) {
207  FFV1Context *fs = s->slice_context[j];
208  for (i = 0; i < s->plane_count; i++) {
209  PlaneContext *p = &fs->plane[i];
210 
211  av_freep(&p->state);
212  av_freep(&p->vlc_state);
213  }
214  av_freep(&fs->sample_buffer);
215  }
216 
217  av_freep(&avctx->stats_out);
218  for (j = 0; j < s->quant_table_count; j++) {
219  av_freep(&s->initial_states[j]);
220  for (i = 0; i < s->slice_count; i++) {
221  FFV1Context *sf = s->slice_context[i];
222  av_freep(&sf->rc_stat2[j]);
223  }
224  av_freep(&s->rc_stat2[j]);
225  }
226 
227  for (i = 0; i < s->slice_count; i++)
228  av_freep(&s->slice_context[i]);
229 
230  return 0;
231 }