FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ffv1.c
Go to the documentation of this file.
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;
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  }
88  }
89 
90  if (fs->ac > 1) {
91  //FIXME only redo if state_transition changed
92  for (j = 1; j < 256; j++) {
93  fs->c. one_state[ j] = f->state_transition[j];
94  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
95  }
96  }
97 
98  return 0;
99 }
100 
102 {
103  int i, ret;
104  for (i = 0; i < f->slice_count; i++) {
105  FFV1Context *fs = f->slice_context[i];
106  if ((ret = ffv1_init_slice_state(f, fs)) < 0)
107  return AVERROR(ENOMEM);
108  }
109  return 0;
110 }
111 
113 {
114  int i;
115 
117  av_assert0(f->slice_count > 0);
118 
119  for (i = 0; i < f->slice_count; i++) {
120  FFV1Context *fs = av_mallocz(sizeof(*fs));
121  int sx = i % f->num_h_slices;
122  int sy = i / f->num_h_slices;
123  int sxs = f->avctx->width * sx / f->num_h_slices;
124  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
125  int sys = f->avctx->height * sy / f->num_v_slices;
126  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
127 
128  if (!fs)
129  return AVERROR(ENOMEM);
130 
131  f->slice_context[i] = fs;
132  memcpy(fs, f, sizeof(*fs));
133  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
134 
135  fs->slice_width = sxe - sxs;
136  fs->slice_height = sye - sys;
137  fs->slice_x = sxs;
138  fs->slice_y = sys;
139 
140  fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
141  sizeof(*fs->sample_buffer));
142  if (!fs->sample_buffer)
143  return AVERROR(ENOMEM);
144  }
145  return 0;
146 }
147 
149 {
150  int i;
151 
152  for (i = 0; i < f->quant_table_count; i++) {
154  sizeof(*f->initial_states[i]));
155  if (!f->initial_states[i])
156  return AVERROR(ENOMEM);
157  memset(f->initial_states[i], 128,
158  f->context_count[i] * sizeof(*f->initial_states[i]));
159  }
160  return 0;
161 }
162 
164 {
165  int i, j;
166 
167  for (i = 0; i < f->plane_count; i++) {
168  PlaneContext *p = &fs->plane[i];
169 
170  p->interlace_bit_state[0] = 128;
171  p->interlace_bit_state[1] = 128;
172 
173  if (fs->ac) {
174  if (f->initial_states[p->quant_table_index]) {
175  memcpy(p->state, f->initial_states[p->quant_table_index],
177  } else
178  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
179  } else {
180  for (j = 0; j < p->context_count; j++) {
181  p->vlc_state[j].drift = 0;
182  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
183  p->vlc_state[j].bias = 0;
184  p->vlc_state[j].count = 1;
185  }
186  }
187  }
188 }
189 
190 
192 {
193  FFV1Context *s = avctx->priv_data;
194  int i, j;
195 
196  if (s->picture.f)
197  ff_thread_release_buffer(avctx, &s->picture);
198  av_frame_free(&s->picture.f);
199 
200  if (s->last_picture.f)
203 
204  for (j = 0; j < s->slice_count; j++) {
205  FFV1Context *fs = s->slice_context[j];
206  for (i = 0; i < s->plane_count; i++) {
207  PlaneContext *p = &fs->plane[i];
208 
209  av_freep(&p->state);
210  av_freep(&p->vlc_state);
211  }
212  av_freep(&fs->sample_buffer);
213  }
214 
215  av_freep(&avctx->stats_out);
216  for (j = 0; j < s->quant_table_count; j++) {
217  av_freep(&s->initial_states[j]);
218  for (i = 0; i < s->slice_count; i++) {
219  FFV1Context *sf = s->slice_context[i];
220  av_freep(&sf->rc_stat2[j]);
221  }
222  av_freep(&s->rc_stat2[j]);
223  }
224 
225  for (i = 0; i < s->slice_count; i++)
226  av_freep(&s->slice_context[i]);
227 
228  return 0;
229 }