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path: root/libavcodec/ffv1.c (plain)
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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
36#include "avcodec.h"
37#include "internal.h"
38#include "rangecoder.h"
39#include "mathops.h"
40#include "ffv1.h"
41
42av_cold int ff_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 ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
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 != AC_GOLOMB_RICE) {
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_mallocz_array(p->context_count, sizeof(VlcState));
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 == AC_RANGE_CUSTOM_TAB) {
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
106av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
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 = ff_ffv1_init_slice_state(f, fs)) < 0)
112 return AVERROR(ENOMEM);
113 }
114 return 0;
115}
116
117av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
118{
119 int i;
120
121 f->max_slice_count = f->num_h_slices * f->num_v_slices;
122 av_assert0(f->max_slice_count > 0);
123
124 for (i = 0; i < f->max_slice_count; i++) {
125 int sx = i % f->num_h_slices;
126 int sy = i / f->num_h_slices;
127 int sxs = f->avctx->width * sx / f->num_h_slices;
128 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
129 int sys = f->avctx->height * sy / f->num_v_slices;
130 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
131 FFV1Context *fs = av_mallocz(sizeof(*fs));
132
133 if (!fs)
134 goto memfail;
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 fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
148 sizeof(*fs->sample_buffer32));
149 if (!fs->sample_buffer || !fs->sample_buffer32) {
150 av_freep(&fs->sample_buffer);
151 av_freep(&fs->sample_buffer32);
152 av_freep(&f->slice_context[i]);
153 goto memfail;
154 }
155 }
156 return 0;
157
158memfail:
159 while(--i >= 0) {
160 av_freep(&f->slice_context[i]->sample_buffer);
161 av_freep(&f->slice_context[i]->sample_buffer32);
162 av_freep(&f->slice_context[i]);
163 }
164 return AVERROR(ENOMEM);
165}
166
167int ff_ffv1_allocate_initial_states(FFV1Context *f)
168{
169 int i;
170
171 for (i = 0; i < f->quant_table_count; i++) {
172 f->initial_states[i] = av_malloc_array(f->context_count[i],
173 sizeof(*f->initial_states[i]));
174 if (!f->initial_states[i])
175 return AVERROR(ENOMEM);
176 memset(f->initial_states[i], 128,
177 f->context_count[i] * sizeof(*f->initial_states[i]));
178 }
179 return 0;
180}
181
182void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
183{
184 int i, j;
185
186 for (i = 0; i < f->plane_count; i++) {
187 PlaneContext *p = &fs->plane[i];
188
189 p->interlace_bit_state[0] = 128;
190 p->interlace_bit_state[1] = 128;
191
192 if (fs->ac != AC_GOLOMB_RICE) {
193 if (f->initial_states[p->quant_table_index]) {
194 memcpy(p->state, f->initial_states[p->quant_table_index],
195 CONTEXT_SIZE * p->context_count);
196 } else
197 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
198 } else {
199 for (j = 0; j < p->context_count; j++) {
200 p->vlc_state[j].drift = 0;
201 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
202 p->vlc_state[j].bias = 0;
203 p->vlc_state[j].count = 1;
204 }
205 }
206 }
207}
208
209
210av_cold int ff_ffv1_close(AVCodecContext *avctx)
211{
212 FFV1Context *s = avctx->priv_data;
213 int i, j;
214
215 if (s->picture.f)
216 ff_thread_release_buffer(avctx, &s->picture);
217 av_frame_free(&s->picture.f);
218
219 if (s->last_picture.f)
220 ff_thread_release_buffer(avctx, &s->last_picture);
221 av_frame_free(&s->last_picture.f);
222
223 for (j = 0; j < s->max_slice_count; j++) {
224 FFV1Context *fs = s->slice_context[j];
225 for (i = 0; i < s->plane_count; i++) {
226 PlaneContext *p = &fs->plane[i];
227
228 av_freep(&p->state);
229 av_freep(&p->vlc_state);
230 }
231 av_freep(&fs->sample_buffer);
232 av_freep(&fs->sample_buffer32);
233 }
234
235 av_freep(&avctx->stats_out);
236 for (j = 0; j < s->quant_table_count; j++) {
237 av_freep(&s->initial_states[j]);
238 for (i = 0; i < s->max_slice_count; i++) {
239 FFV1Context *sf = s->slice_context[i];
240 av_freep(&sf->rc_stat2[j]);
241 }
242 av_freep(&s->rc_stat2[j]);
243 }
244
245 for (i = 0; i < s->max_slice_count; i++)
246 av_freep(&s->slice_context[i]);
247
248 return 0;
249}
250
generated by cgit at 2024-05-17 03:07:38 (GMT)