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 
ffv1_common_init(AVCodecContext * avctx)42 av_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 
ffv1_init_slice_state(FFV1Context * f,FFV1Context * fs)67 av_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 
ffv1_init_slices_state(FFV1Context * f)101 av_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 
ffv1_init_slice_contexts(FFV1Context * f)112 av_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 
ffv1_allocate_initial_states(FFV1Context * f)148 int 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 
ffv1_clear_slice_state(FFV1Context * f,FFV1Context * fs)163 void 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 
ffv1_close(AVCodecContext * avctx)191 av_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 }
230