xref: /third_party/ffmpeg/libavcodec/ffv1.c (revision cabdff1a) 
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
36av_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
61av_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
100av_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
111av_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
148memfail:
149    f->max_slice_count = i;
150    return AVERROR(ENOMEM);
151}
152
153int 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
168void 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
196av_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