2 * FFV1 codec for libavcodec
4 * Copyright (c) 2003-2012 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/avassert.h"
29 #include "libavutil/crc.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/timer.h"
37 #include "rangecoder.h"
42 av_cold int 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 avcodec_get_frame_defaults(&s->picture);
54 ff_dsputil_init(&s->dsp, avctx);
56 s->width = avctx->width;
57 s->height = avctx->height;
66 int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
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];
77 p->state = av_malloc(CONTEXT_SIZE * p->context_count *
80 return AVERROR(ENOMEM);
83 p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
85 return AVERROR(ENOMEM);
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];
100 int ffv1_init_slices_state(FFV1Context *f)
103 for (i = 0; i < f->slice_count; i++) {
104 FFV1Context *fs = f->slice_context[i];
105 if ((ret = ffv1_init_slice_state(f, fs)) < 0)
106 return AVERROR(ENOMEM);
111 av_cold int ffv1_init_slice_contexts(FFV1Context *f)
115 f->slice_count = f->num_h_slices * f->num_v_slices;
116 av_assert0(f->slice_count > 0);
118 for (i = 0; i < f->slice_count; i++) {
119 FFV1Context *fs = av_mallocz(sizeof(*fs));
120 int sx = i % f->num_h_slices;
121 int sy = i / f->num_h_slices;
122 int sxs = f->avctx->width * sx / f->num_h_slices;
123 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
124 int sys = f->avctx->height * sy / f->num_v_slices;
125 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
126 f->slice_context[i] = fs;
127 memcpy(fs, f, sizeof(*fs));
128 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
130 fs->slice_width = sxe - sxs;
131 fs->slice_height = sye - sys;
135 fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
136 sizeof(*fs->sample_buffer));
137 if (!fs->sample_buffer)
138 return AVERROR(ENOMEM);
143 int ffv1_allocate_initial_states(FFV1Context *f)
147 for (i = 0; i < f->quant_table_count; i++) {
148 f->initial_states[i] = av_malloc(f->context_count[i] *
149 sizeof(*f->initial_states[i]));
150 if (!f->initial_states[i])
151 return AVERROR(ENOMEM);
152 memset(f->initial_states[i], 128,
153 f->context_count[i] * sizeof(*f->initial_states[i]));
158 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
162 for (i = 0; i < f->plane_count; i++) {
163 PlaneContext *p = &fs->plane[i];
165 p->interlace_bit_state[0] = 128;
166 p->interlace_bit_state[1] = 128;
169 if (f->initial_states[p->quant_table_index]) {
170 memcpy(p->state, f->initial_states[p->quant_table_index],
171 CONTEXT_SIZE * p->context_count);
173 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
175 for (j = 0; j < p->context_count; j++) {
176 p->vlc_state[j].drift = 0;
177 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
178 p->vlc_state[j].bias = 0;
179 p->vlc_state[j].count = 1;
186 av_cold int ffv1_close(AVCodecContext *avctx)
188 FFV1Context *s = avctx->priv_data;
191 if (avctx->codec->decode && s->picture.data[0])
192 avctx->release_buffer(avctx, &s->picture);
193 if (avctx->codec->decode && s->last_picture.data[0])
194 avctx->release_buffer(avctx, &s->last_picture);
196 for (j = 0; j < s->slice_count; j++) {
197 FFV1Context *fs = s->slice_context[j];
198 for (i = 0; i < s->plane_count; i++) {
199 PlaneContext *p = &fs->plane[i];
202 av_freep(&p->vlc_state);
204 av_freep(&fs->sample_buffer);
207 av_freep(&avctx->stats_out);
208 for (j = 0; j < s->quant_table_count; j++) {
209 av_freep(&s->initial_states[j]);
210 for (i = 0; i < s->slice_count; i++) {
211 FFV1Context *sf = s->slice_context[i];
212 av_freep(&sf->rc_stat2[j]);
214 av_freep(&s->rc_stat2[j]);
217 for (i = 0; i < s->slice_count; i++)
218 av_freep(&s->slice_context[i]);