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, max_slice_count = f->num_h_slices * f->num_v_slices;
119
120 av_assert0(max_slice_count > 0);
121
122 for (i = 0; i < max_slice_count;) {
123 int sx = i % f->num_h_slices;
124 int sy = i / f->num_h_slices;
125 int sxs = f->avctx->width * sx / f->num_h_slices;
126 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
127 int sys = f->avctx->height * sy / f->num_v_slices;
128 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
129 FFV1Context *fs = av_mallocz(sizeof(*fs));
130
131 if (!fs)
132 goto memfail;
133
134 f->slice_context[i++] = fs;
135 memcpy(fs, f, sizeof(*fs));
136 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
137
138 fs->slice_width = sxe - sxs;
139 fs->slice_height = sye - sys;
140 fs->slice_x = sxs;
141 fs->slice_y = sys;
142
143 fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
144 sizeof(*fs->sample_buffer));
145 fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
146 sizeof(*fs->sample_buffer32));
147 if (!fs->sample_buffer || !fs->sample_buffer32)
148 goto memfail;
149 }
150 f->max_slice_count = max_slice_count;
151 return 0;
152
153 memfail:
154 f->max_slice_count = i;
155 return AVERROR(ENOMEM);
156 }
157
ff_ffv1_allocate_initial_states(FFV1Context * f)158 int ff_ffv1_allocate_initial_states(FFV1Context *f)
159 {
160 int i;
161
162 for (i = 0; i < f->quant_table_count; i++) {
163 f->initial_states[i] = av_malloc_array(f->context_count[i],
164 sizeof(*f->initial_states[i]));
165 if (!f->initial_states[i])
166 return AVERROR(ENOMEM);
167 memset(f->initial_states[i], 128,
168 f->context_count[i] * sizeof(*f->initial_states[i]));
169 }
170 return 0;
171 }
172
ff_ffv1_clear_slice_state(FFV1Context * f,FFV1Context * fs)173 void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
174 {
175 int i, j;
176
177 for (i = 0; i < f->plane_count; i++) {
178 PlaneContext *p = &fs->plane[i];
179
180 p->interlace_bit_state[0] = 128;
181 p->interlace_bit_state[1] = 128;
182
183 if (fs->ac != AC_GOLOMB_RICE) {
184 if (f->initial_states[p->quant_table_index]) {
185 memcpy(p->state, f->initial_states[p->quant_table_index],
186 CONTEXT_SIZE * p->context_count);
187 } else
188 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
189 } else {
190 for (j = 0; j < p->context_count; j++) {
191 p->vlc_state[j].drift = 0;
192 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
193 p->vlc_state[j].bias = 0;
194 p->vlc_state[j].count = 1;
195 }
196 }
197 }
198 }
199
200
ff_ffv1_close(AVCodecContext * avctx)201 av_cold int ff_ffv1_close(AVCodecContext *avctx)
202 {
203 FFV1Context *s = avctx->priv_data;
204 int i, j;
205
206 if (s->picture.f)
207 ff_thread_release_buffer(avctx, &s->picture);
208 av_frame_free(&s->picture.f);
209
210 if (s->last_picture.f)
211 ff_thread_release_buffer(avctx, &s->last_picture);
212 av_frame_free(&s->last_picture.f);
213
214 for (j = 0; j < s->max_slice_count; j++) {
215 FFV1Context *fs = s->slice_context[j];
216 for (i = 0; i < s->plane_count; i++) {
217 PlaneContext *p = &fs->plane[i];
218
219 av_freep(&p->state);
220 av_freep(&p->vlc_state);
221 }
222 av_freep(&fs->sample_buffer);
223 av_freep(&fs->sample_buffer32);
224 }
225
226 av_freep(&avctx->stats_out);
227 for (j = 0; j < s->quant_table_count; j++) {
228 av_freep(&s->initial_states[j]);
229 for (i = 0; i < s->max_slice_count; i++) {
230 FFV1Context *sf = s->slice_context[i];
231 av_freep(&sf->rc_stat2[j]);
232 }
233 av_freep(&s->rc_stat2[j]);
234 }
235
236 for (i = 0; i < s->max_slice_count; i++)
237 av_freep(&s->slice_context[i]);
238
239 return 0;
240 }
241