Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / ffv1.c
CommitLineData
2ba45a60
DM
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
42av_cold int ffv1_common_init(AVCodecContext *avctx)
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();
53 s->last_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
67av_cold int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
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)
78 p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
79 sizeof(uint8_t));
80 if (!p->state)
81 return AVERROR(ENOMEM);
82 } else {
83 if (!p->vlc_state)
84 p->vlc_state = av_malloc_array(p->context_count, sizeof(VlcState));
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
101av_cold int ffv1_init_slices_state(FFV1Context *f)
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
112av_cold int ffv1_init_slice_contexts(FFV1Context *f)
113{
114 int i;
115
116 f->slice_count = f->num_h_slices * f->num_v_slices;
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
148int ffv1_allocate_initial_states(FFV1Context *f)
149{
150 int i;
151
152 for (i = 0; i < f->quant_table_count; i++) {
153 f->initial_states[i] = av_malloc_array(f->context_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
163void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
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],
176 CONTEXT_SIZE * p->context_count);
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
191av_cold int ffv1_close(AVCodecContext *avctx)
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)
201 ff_thread_release_buffer(avctx, &s->last_picture);
202 av_frame_free(&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}