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
35 #include "avcodec.h"
36 #include "internal.h"
37 #include "rangecoder.h"
38 #include "mathops.h"
39 #include "ffv1.h"
40
ff_ffv1_common_init(AVCodecContext * avctx)41 av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
42 {
43 FFV1Context *s = avctx->priv_data;
44
45 if (!avctx->width || !avctx->height)
46 return AVERROR_INVALIDDATA;
47
48 s->avctx = avctx;
49 s->flags = avctx->flags;
50
51 s->picture.f = av_frame_alloc();
52 s->last_picture.f = av_frame_alloc();
53 if (!s->picture.f || !s->last_picture.f)
54 return AVERROR(ENOMEM);
55
56 s->width = avctx->width;
57 s->height = avctx->height;
58
59 // defaults
60 s->num_h_slices = 1;
61 s->num_v_slices = 1;
62
63 return 0;
64 }
65
ff_ffv1_init_slice_state(FFV1Context * f,FFV1Context * fs)66 av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
67 {
68 int j, i;
69
70 fs->plane_count = f->plane_count;
71 fs->transparency = f->transparency;
72 for (j = 0; j < f->plane_count; j++) {
73 PlaneContext *const p = &fs->plane[j];
74
75 if (fs->ac != AC_GOLOMB_RICE) {
76 if (!p->state)
77 p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
78 sizeof(uint8_t));
79 if (!p->state)
80 return AVERROR(ENOMEM);
81 } else {
82 if (!p->vlc_state) {
83 p->vlc_state = av_mallocz_array(p->context_count, sizeof(VlcState));
84 if (!p->vlc_state)
85 return AVERROR(ENOMEM);
86 for (i = 0; i < p->context_count; i++) {
87 p->vlc_state[i].error_sum = 4;
88 p->vlc_state[i].count = 1;
89 }
90 }
91 }
92 }
93
94 if (fs->ac == AC_RANGE_CUSTOM_TAB) {
95 //FIXME only redo if state_transition changed
96 for (j = 1; j < 256; j++) {
97 fs->c. one_state[ j] = f->state_transition[j];
98 fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
99 }
100 }
101
102 return 0;
103 }
104
ff_ffv1_init_slices_state(FFV1Context * f)105 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
106 {
107 int i, ret;
108 for (i = 0; i < f->max_slice_count; i++) {
109 FFV1Context *fs = f->slice_context[i];
110 if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
111 return AVERROR(ENOMEM);
112 }
113 return 0;
114 }
115
ff_ffv1_init_slice_contexts(FFV1Context * f)116 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
117 {
118 int i;
119
120 f->max_slice_count = f->num_h_slices * f->num_v_slices;
121 av_assert0(f->max_slice_count > 0);
122
123 for (i = 0; i < f->max_slice_count; i++) {
124 int sx = i % f->num_h_slices;
125 int sy = i / f->num_h_slices;
126 int sxs = f->avctx->width * sx / f->num_h_slices;
127 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
128 int sys = f->avctx->height * sy / f->num_v_slices;
129 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
130 FFV1Context *fs = av_mallocz(sizeof(*fs));
131
132 if (!fs)
133 goto memfail;
134
135 f->slice_context[i] = fs;
136 memcpy(fs, f, sizeof(*fs));
137 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
138
139 fs->slice_width = sxe - sxs;
140 fs->slice_height = sye - sys;
141 fs->slice_x = sxs;
142 fs->slice_y = sys;
143
144 fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
145 sizeof(*fs->sample_buffer));
146 fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
147 sizeof(*fs->sample_buffer32));
148 if (!fs->sample_buffer || !fs->sample_buffer32) {
149 av_freep(&fs->sample_buffer);
150 av_freep(&fs->sample_buffer32);
151 av_freep(&f->slice_context[i]);
152 goto memfail;
153 }
154 }
155 return 0;
156
157 memfail:
158 while(--i >= 0) {
159 av_freep(&f->slice_context[i]->sample_buffer);
160 av_freep(&f->slice_context[i]->sample_buffer32);
161 av_freep(&f->slice_context[i]);
162 }
163 return AVERROR(ENOMEM);
164 }
165
ff_ffv1_allocate_initial_states(FFV1Context * f)166 int ff_ffv1_allocate_initial_states(FFV1Context *f)
167 {
168 int i;
169
170 for (i = 0; i < f->quant_table_count; i++) {
171 f->initial_states[i] = av_malloc_array(f->context_count[i],
172 sizeof(*f->initial_states[i]));
173 if (!f->initial_states[i])
174 return AVERROR(ENOMEM);
175 memset(f->initial_states[i], 128,
176 f->context_count[i] * sizeof(*f->initial_states[i]));
177 }
178 return 0;
179 }
180
ff_ffv1_clear_slice_state(FFV1Context * f,FFV1Context * fs)181 void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
182 {
183 int i, j;
184
185 for (i = 0; i < f->plane_count; i++) {
186 PlaneContext *p = &fs->plane[i];
187
188 p->interlace_bit_state[0] = 128;
189 p->interlace_bit_state[1] = 128;
190
191 if (fs->ac != AC_GOLOMB_RICE) {
192 if (f->initial_states[p->quant_table_index]) {
193 memcpy(p->state, f->initial_states[p->quant_table_index],
194 CONTEXT_SIZE * p->context_count);
195 } else
196 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
197 } else {
198 for (j = 0; j < p->context_count; j++) {
199 p->vlc_state[j].drift = 0;
200 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
201 p->vlc_state[j].bias = 0;
202 p->vlc_state[j].count = 1;
203 }
204 }
205 }
206 }
207
208
ff_ffv1_close(AVCodecContext * avctx)209 av_cold int ff_ffv1_close(AVCodecContext *avctx)
210 {
211 FFV1Context *s = avctx->priv_data;
212 int i, j;
213
214 if (s->picture.f)
215 ff_thread_release_buffer(avctx, &s->picture);
216 av_frame_free(&s->picture.f);
217
218 if (s->last_picture.f)
219 ff_thread_release_buffer(avctx, &s->last_picture);
220 av_frame_free(&s->last_picture.f);
221
222 for (j = 0; j < s->max_slice_count; j++) {
223 FFV1Context *fs = s->slice_context[j];
224 for (i = 0; i < s->plane_count; i++) {
225 PlaneContext *p = &fs->plane[i];
226
227 av_freep(&p->state);
228 av_freep(&p->vlc_state);
229 }
230 av_freep(&fs->sample_buffer);
231 av_freep(&fs->sample_buffer32);
232 }
233
234 av_freep(&avctx->stats_out);
235 for (j = 0; j < s->quant_table_count; j++) {
236 av_freep(&s->initial_states[j]);
237 for (i = 0; i < s->max_slice_count; i++) {
238 FFV1Context *sf = s->slice_context[i];
239 av_freep(&sf->rc_stat2[j]);
240 }
241 av_freep(&s->rc_stat2[j]);
242 }
243
244 for (i = 0; i < s->max_slice_count; i++)
245 av_freep(&s->slice_context[i]);
246
247 return 0;
248 }
249