FFmpeg  2.6.9
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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  s->width = avctx->width;
58  s->height = avctx->height;
59 
60  // defaults
61  s->num_h_slices = 1;
62  s->num_v_slices = 1;
63 
64  return 0;
65 }
66 
68 {
69  int j, i;
70 
71  fs->plane_count = f->plane_count;
72  fs->transparency = f->transparency;
73  for (j = 0; j < f->plane_count; j++) {
74  PlaneContext *const p = &fs->plane[j];
75 
76  if (fs->ac) {
77  if (!p->state)
79  sizeof(uint8_t));
80  if (!p->state)
81  return AVERROR(ENOMEM);
82  } else {
83  if (!p->vlc_state) {
85  if (!p->vlc_state)
86  return AVERROR(ENOMEM);
87  for (i = 0; i < p->context_count; i++) {
88  p->vlc_state[i].error_sum = 4;
89  p->vlc_state[i].count = 1;
90  }
91  }
92  }
93  }
94 
95  if (fs->ac > 1) {
96  //FIXME only redo if state_transition changed
97  for (j = 1; j < 256; j++) {
98  fs->c. one_state[ j] = f->state_transition[j];
99  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
100  }
101  }
102 
103  return 0;
104 }
105 
107 {
108  int i, ret;
109  for (i = 0; i < f->max_slice_count; i++) {
110  FFV1Context *fs = f->slice_context[i];
111  if ((ret = ffv1_init_slice_state(f, fs)) < 0)
112  return AVERROR(ENOMEM);
113  }
114  return 0;
115 }
116 
118 {
119  int i;
120 
122  av_assert0(f->max_slice_count > 0);
123 
124  for (i = 0; i < f->max_slice_count; i++) {
125  FFV1Context *fs = av_mallocz(sizeof(*fs));
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 
133  if (!fs)
134  return AVERROR(ENOMEM);
135 
136  f->slice_context[i] = fs;
137  memcpy(fs, f, sizeof(*fs));
138  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
139 
140  fs->slice_width = sxe - sxs;
141  fs->slice_height = sye - sys;
142  fs->slice_x = sxs;
143  fs->slice_y = sys;
144 
145  fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
146  sizeof(*fs->sample_buffer));
147  if (!fs->sample_buffer)
148  return AVERROR(ENOMEM);
149  }
150  return 0;
151 }
152 
154 {
155  int i;
156 
157  for (i = 0; i < f->quant_table_count; i++) {
159  sizeof(*f->initial_states[i]));
160  if (!f->initial_states[i])
161  return AVERROR(ENOMEM);
162  memset(f->initial_states[i], 128,
163  f->context_count[i] * sizeof(*f->initial_states[i]));
164  }
165  return 0;
166 }
167 
169 {
170  int i, j;
171 
172  for (i = 0; i < f->plane_count; i++) {
173  PlaneContext *p = &fs->plane[i];
174 
175  p->interlace_bit_state[0] = 128;
176  p->interlace_bit_state[1] = 128;
177 
178  if (fs->ac) {
179  if (f->initial_states[p->quant_table_index]) {
180  memcpy(p->state, f->initial_states[p->quant_table_index],
182  } else
183  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
184  } else {
185  for (j = 0; j < p->context_count; j++) {
186  p->vlc_state[j].drift = 0;
187  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
188  p->vlc_state[j].bias = 0;
189  p->vlc_state[j].count = 1;
190  }
191  }
192  }
193 }
194 
195 
197 {
198  FFV1Context *s = avctx->priv_data;
199  int i, j;
200 
201  if (s->picture.f)
202  ff_thread_release_buffer(avctx, &s->picture);
203  av_frame_free(&s->picture.f);
204 
205  if (s->last_picture.f)
208 
209  for (j = 0; j < s->max_slice_count; j++) {
210  FFV1Context *fs = s->slice_context[j];
211  for (i = 0; i < s->plane_count; i++) {
212  PlaneContext *p = &fs->plane[i];
213 
214  av_freep(&p->state);
215  av_freep(&p->vlc_state);
216  }
217  av_freep(&fs->sample_buffer);
218  }
219 
220  av_freep(&avctx->stats_out);
221  for (j = 0; j < s->quant_table_count; j++) {
222  av_freep(&s->initial_states[j]);
223  for (i = 0; i < s->max_slice_count; i++) {
224  FFV1Context *sf = s->slice_context[i];
225  av_freep(&sf->rc_stat2[j]);
226  }
227  av_freep(&s->rc_stat2[j]);
228  }
229 
230  for (i = 0; i < s->max_slice_count; i++)
231  av_freep(&s->slice_context[i]);
232 
233  return 0;
234 }