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"
37 #include "rangecoder.h"
42 av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
44 FFV1Context *s = avctx->priv_data;
46 if (!avctx->width || !avctx->height)
47 return AVERROR_INVALIDDATA;
50 s->flags = avctx->flags;
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);
57 s->width = avctx->width;
58 s->height = avctx->height;
67 av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
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];
76 if (fs->ac != AC_GOLOMB_RICE) {
78 p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
81 return AVERROR(ENOMEM);
84 p->vlc_state = av_mallocz_array(p->context_count, sizeof(VlcState));
86 return AVERROR(ENOMEM);
87 for (i = 0; i < p->context_count; i++) {
88 p->vlc_state[i].error_sum = 4;
89 p->vlc_state[i].count = 1;
95 if (fs->ac == AC_RANGE_CUSTOM_TAB) {
96 //FIXME only redo if state_transition changed
97 for (j = 1; j < 256; j++) {
98 fs->c. one_state[ j] = f->state_transition[j];
99 fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
106 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
109 for (i = 0; i < f->max_slice_count; i++) {
110 FFV1Context *fs = f->slice_context[i];
111 if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
112 return AVERROR(ENOMEM);
117 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
121 f->max_slice_count = f->num_h_slices * f->num_v_slices;
122 av_assert0(f->max_slice_count > 0);
124 for (i = 0; i < f->max_slice_count; i++) {
125 int sx = i % f->num_h_slices;
126 int sy = i / f->num_h_slices;
127 int sxs = f->avctx->width * sx / f->num_h_slices;
128 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
129 int sys = f->avctx->height * sy / f->num_v_slices;
130 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
131 FFV1Context *fs = av_mallocz(sizeof(*fs));
136 f->slice_context[i] = fs;
137 memcpy(fs, f, sizeof(*fs));
138 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
140 fs->slice_width = sxe - sxs;
141 fs->slice_height = sye - sys;
145 fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
146 sizeof(*fs->sample_buffer));
147 if (!fs->sample_buffer) {
148 av_freep(&f->slice_context[i]);
156 av_freep(&f->slice_context[i]->sample_buffer);
157 av_freep(&f->slice_context[i]);
159 return AVERROR(ENOMEM);
162 int ff_ffv1_allocate_initial_states(FFV1Context *f)
166 for (i = 0; i < f->quant_table_count; i++) {
167 f->initial_states[i] = av_malloc_array(f->context_count[i],
168 sizeof(*f->initial_states[i]));
169 if (!f->initial_states[i])
170 return AVERROR(ENOMEM);
171 memset(f->initial_states[i], 128,
172 f->context_count[i] * sizeof(*f->initial_states[i]));
177 void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
181 for (i = 0; i < f->plane_count; i++) {
182 PlaneContext *p = &fs->plane[i];
184 p->interlace_bit_state[0] = 128;
185 p->interlace_bit_state[1] = 128;
187 if (fs->ac != AC_GOLOMB_RICE) {
188 if (f->initial_states[p->quant_table_index]) {
189 memcpy(p->state, f->initial_states[p->quant_table_index],
190 CONTEXT_SIZE * p->context_count);
192 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
194 for (j = 0; j < p->context_count; j++) {
195 p->vlc_state[j].drift = 0;
196 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
197 p->vlc_state[j].bias = 0;
198 p->vlc_state[j].count = 1;
205 av_cold int ff_ffv1_close(AVCodecContext *avctx)
207 FFV1Context *s = avctx->priv_data;
211 ff_thread_release_buffer(avctx, &s->picture);
212 av_frame_free(&s->picture.f);
214 if (s->last_picture.f)
215 ff_thread_release_buffer(avctx, &s->last_picture);
216 av_frame_free(&s->last_picture.f);
218 for (j = 0; j < s->max_slice_count; j++) {
219 FFV1Context *fs = s->slice_context[j];
220 for (i = 0; i < s->plane_count; i++) {
221 PlaneContext *p = &fs->plane[i];
224 av_freep(&p->vlc_state);
226 av_freep(&fs->sample_buffer);
229 av_freep(&avctx->stats_out);
230 for (j = 0; j < s->quant_table_count; j++) {
231 av_freep(&s->initial_states[j]);
232 for (i = 0; i < s->max_slice_count; i++) {
233 FFV1Context *sf = s->slice_context[i];
234 av_freep(&sf->rc_stat2[j]);
236 av_freep(&s->rc_stat2[j]);
239 for (i = 0; i < s->max_slice_count; i++)
240 av_freep(&s->slice_context[i]);