2 * FFV1 codec for libavcodec
4 * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
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.
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.
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
25 * FF Video Codec 1 (a lossless codec)
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"
38 #include "rangecoder.h"
43 av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
45 FFV1Context *s = avctx->priv_data;
47 if (!avctx->width || !avctx->height)
48 return AVERROR_INVALIDDATA;
51 s->flags = avctx->flags;
53 s->picture.f = av_frame_alloc();
54 s->last_picture.f = av_frame_alloc();
55 if (!s->picture.f || !s->last_picture.f)
56 return AVERROR(ENOMEM);
58 s->width = avctx->width;
59 s->height = avctx->height;
68 av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
72 fs->plane_count = f->plane_count;
73 fs->transparency = f->transparency;
74 for (j = 0; j < f->plane_count; j++) {
75 PlaneContext *const p = &fs->plane[j];
77 if (fs->ac != AC_GOLOMB_RICE) {
79 p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
82 return AVERROR(ENOMEM);
85 p->vlc_state = av_mallocz_array(p->context_count, sizeof(VlcState));
87 return AVERROR(ENOMEM);
88 for (i = 0; i < p->context_count; i++) {
89 p->vlc_state[i].error_sum = 4;
90 p->vlc_state[i].count = 1;
96 if (fs->ac == AC_RANGE_CUSTOM_TAB) {
97 //FIXME only redo if state_transition changed
98 for (j = 1; j < 256; j++) {
99 fs->c. one_state[ j] = f->state_transition[j];
100 fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
107 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
110 for (i = 0; i < f->max_slice_count; i++) {
111 FFV1Context *fs = f->slice_context[i];
112 if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
113 return AVERROR(ENOMEM);
118 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
122 f->max_slice_count = f->num_h_slices * f->num_v_slices;
123 av_assert0(f->max_slice_count > 0);
125 for (i = 0; i < f->max_slice_count; i++) {
126 int sx = i % f->num_h_slices;
127 int sy = i / f->num_h_slices;
128 int sxs = f->avctx->width * sx / f->num_h_slices;
129 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
130 int sys = f->avctx->height * sy / f->num_v_slices;
131 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
132 FFV1Context *fs = av_mallocz(sizeof(*fs));
137 f->slice_context[i] = fs;
138 memcpy(fs, f, sizeof(*fs));
139 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
141 fs->slice_width = sxe - sxs;
142 fs->slice_height = sye - sys;
146 fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
147 sizeof(*fs->sample_buffer));
148 if (!fs->sample_buffer) {
149 av_freep(&f->slice_context[i]);
157 av_freep(&f->slice_context[i]->sample_buffer);
158 av_freep(&f->slice_context[i]);
160 return AVERROR(ENOMEM);
163 int ff_ffv1_allocate_initial_states(FFV1Context *f)
167 for (i = 0; i < f->quant_table_count; i++) {
168 f->initial_states[i] = av_malloc_array(f->context_count[i],
169 sizeof(*f->initial_states[i]));
170 if (!f->initial_states[i])
171 return AVERROR(ENOMEM);
172 memset(f->initial_states[i], 128,
173 f->context_count[i] * sizeof(*f->initial_states[i]));
178 void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
182 for (i = 0; i < f->plane_count; i++) {
183 PlaneContext *p = &fs->plane[i];
185 p->interlace_bit_state[0] = 128;
186 p->interlace_bit_state[1] = 128;
188 if (fs->ac != AC_GOLOMB_RICE) {
189 if (f->initial_states[p->quant_table_index]) {
190 memcpy(p->state, f->initial_states[p->quant_table_index],
191 CONTEXT_SIZE * p->context_count);
193 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
195 for (j = 0; j < p->context_count; j++) {
196 p->vlc_state[j].drift = 0;
197 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
198 p->vlc_state[j].bias = 0;
199 p->vlc_state[j].count = 1;
206 av_cold int ff_ffv1_close(AVCodecContext *avctx)
208 FFV1Context *s = avctx->priv_data;
212 ff_thread_release_buffer(avctx, &s->picture);
213 av_frame_free(&s->picture.f);
215 if (s->last_picture.f)
216 ff_thread_release_buffer(avctx, &s->last_picture);
217 av_frame_free(&s->last_picture.f);
219 for (j = 0; j < s->max_slice_count; j++) {
220 FFV1Context *fs = s->slice_context[j];
221 for (i = 0; i < s->plane_count; i++) {
222 PlaneContext *p = &fs->plane[i];
225 av_freep(&p->vlc_state);
227 av_freep(&fs->sample_buffer);
230 av_freep(&avctx->stats_out);
231 for (j = 0; j < s->quant_table_count; j++) {
232 av_freep(&s->initial_states[j]);
233 for (i = 0; i < s->max_slice_count; i++) {
234 FFV1Context *sf = s->slice_context[i];
235 av_freep(&sf->rc_stat2[j]);
237 av_freep(&s->rc_stat2[j]);
240 for (i = 0; i < s->max_slice_count; i++)
241 av_freep(&s->slice_context[i]);