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
31 #include "avcodec.h"
32 #include "rangecoder.h"
33 #include "ffv1.h"
34 #include "threadframe.h"
35
ff_ffv1_common_init(AVCodecContext * avctx)36 av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
37 {
38 FFV1Context *s = avctx->priv_data;
39
40 if (!avctx->width || !avctx->height)
41 return AVERROR_INVALIDDATA;
42
43 s->avctx = avctx;
44 s->flags = avctx->flags;
45
46 s->picture.f = av_frame_alloc();
47 s->last_picture.f = av_frame_alloc();
48 if (!s->picture.f || !s->last_picture.f)
49 return AVERROR(ENOMEM);
50
51 s->width = avctx->width;
52 s->height = avctx->height;
53
54 // defaults
55 s->num_h_slices = 1;
56 s->num_v_slices = 1;
57
58 return 0;
59 }
60
ff_ffv1_init_slice_state(const FFV1Context * f,FFV1Context * fs)61 av_cold int ff_ffv1_init_slice_state(const FFV1Context *f, FFV1Context *fs)
62 {
63 int j, i;
64
65 fs->plane_count = f->plane_count;
66 fs->transparency = f->transparency;
67 for (j = 0; j < f->plane_count; j++) {
68 PlaneContext *const p = &fs->plane[j];
69
70 if (fs->ac != AC_GOLOMB_RICE) {
71 if (!p->state)
72 p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
73 sizeof(uint8_t));
74 if (!p->state)
75 return AVERROR(ENOMEM);
76 } else {
77 if (!p->vlc_state) {
78 p->vlc_state = av_calloc(p->context_count, sizeof(*p->vlc_state));
79 if (!p->vlc_state)
80 return AVERROR(ENOMEM);
81 for (i = 0; i < p->context_count; i++) {
82 p->vlc_state[i].error_sum = 4;
83 p->vlc_state[i].count = 1;
84 }
85 }
86 }
87 }
88
89 if (fs->ac == AC_RANGE_CUSTOM_TAB) {
90 //FIXME only redo if state_transition changed
91 for (j = 1; j < 256; j++) {
92 fs->c. one_state[ j] = f->state_transition[j];
93 fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
94 }
95 }
96
97 return 0;
98 }
99
ff_ffv1_init_slices_state(FFV1Context * f)100 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
101 {
102 int i, ret;
103 for (i = 0; i < f->max_slice_count; i++) {
104 FFV1Context *fs = f->slice_context[i];
105 if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
106 return AVERROR(ENOMEM);
107 }
108 return 0;
109 }
110
ff_ffv1_init_slice_contexts(FFV1Context * f)111 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
112 {
113 int i, max_slice_count = f->num_h_slices * f->num_v_slices;
114
115 av_assert0(max_slice_count > 0);
116
117 for (i = 0; i < max_slice_count;) {
118 int sx = i % f->num_h_slices;
119 int sy = i / f->num_h_slices;
120 int sxs = f->avctx->width * sx / f->num_h_slices;
121 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
122 int sys = f->avctx->height * sy / f->num_v_slices;
123 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
124 FFV1Context *fs = av_mallocz(sizeof(*fs));
125
126 if (!fs)
127 goto memfail;
128
129 f->slice_context[i++] = fs;
130 memcpy(fs, f, sizeof(*fs));
131 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
132
133 fs->slice_width = sxe - sxs;
134 fs->slice_height = sye - sys;
135 fs->slice_x = sxs;
136 fs->slice_y = sys;
137
138 fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
139 sizeof(*fs->sample_buffer));
140 fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
141 sizeof(*fs->sample_buffer32));
142 if (!fs->sample_buffer || !fs->sample_buffer32)
143 goto memfail;
144 }
145 f->max_slice_count = max_slice_count;
146 return 0;
147
148 memfail:
149 f->max_slice_count = i;
150 return AVERROR(ENOMEM);
151 }
152
ff_ffv1_allocate_initial_states(FFV1Context * f)153 int ff_ffv1_allocate_initial_states(FFV1Context *f)
154 {
155 int i;
156
157 for (i = 0; i < f->quant_table_count; i++) {
158 f->initial_states[i] = av_malloc_array(f->context_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
ff_ffv1_clear_slice_state(const FFV1Context * f,FFV1Context * fs)168 void ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1Context *fs)
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 != AC_GOLOMB_RICE) {
179 if (f->initial_states[p->quant_table_index]) {
180 memcpy(p->state, f->initial_states[p->quant_table_index],
181 CONTEXT_SIZE * p->context_count);
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
ff_ffv1_close(AVCodecContext * avctx)196 av_cold int ff_ffv1_close(AVCodecContext *avctx)
197 {
198 FFV1Context *s = avctx->priv_data;
199 int i, j;
200
201 if (s->picture.f)
202 ff_thread_release_ext_buffer(avctx, &s->picture);
203 av_frame_free(&s->picture.f);
204
205 if (s->last_picture.f)
206 ff_thread_release_ext_buffer(avctx, &s->last_picture);
207 av_frame_free(&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 av_freep(&fs->sample_buffer32);
219 }
220
221 av_freep(&avctx->stats_out);
222 for (j = 0; j < s->quant_table_count; j++) {
223 av_freep(&s->initial_states[j]);
224 for (i = 0; i < s->max_slice_count; i++) {
225 FFV1Context *sf = s->slice_context[i];
226 av_freep(&sf->rc_stat2[j]);
227 }
228 av_freep(&s->rc_stat2[j]);
229 }
230
231 for (i = 0; i < s->max_slice_count; i++)
232 av_freep(&s->slice_context[i]);
233
234 return 0;
235 }
236