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) {
102 for (i = 0; i < f->slice_count; i++) {
103 FFV1Context *fs = f->slice_context[i];
104 if (ffv1_init_slice_state(f, fs) < 0)
110 av_cold int ffv1_init_slice_contexts(FFV1Context *f)
114 f->slice_count = f->num_h_slices * f->num_v_slices;
116 for (i = 0; i < f->slice_count; i++) {
117 FFV1Context *fs = av_mallocz(sizeof(*fs));
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 f->slice_context[i] = fs;
125 memcpy(fs, f, sizeof(*fs));
126 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
128 fs->slice_width = sxe - sxs;
129 fs->slice_height = sye - sys;
133 fs->sample_buffer = av_malloc(3*4 * (fs->width+6) * sizeof(*fs->sample_buffer));
134 if (!fs->sample_buffer)
135 return AVERROR(ENOMEM);
140 int ffv1_allocate_initial_states(FFV1Context *f)
144 for (i = 0; i < f->quant_table_count; i++) {
145 f->initial_states[i] = av_malloc(f->context_count[i] *
146 sizeof(*f->initial_states[i]));
147 if (!f->initial_states[i])
148 return AVERROR(ENOMEM);
149 memset(f->initial_states[i], 128,
150 f->context_count[i] * sizeof(*f->initial_states[i]));
155 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
159 for (i = 0; i < f->plane_count; i++) {
160 PlaneContext *p = &fs->plane[i];
162 p->interlace_bit_state[0] = 128;
163 p->interlace_bit_state[1] = 128;
166 if (f->initial_states[p->quant_table_index]) {
167 memcpy(p->state, f->initial_states[p->quant_table_index],
168 CONTEXT_SIZE * p->context_count);
170 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
172 for (j = 0; j < p->context_count; j++) {
173 p->vlc_state[j].drift = 0;
174 p->vlc_state[j].error_sum = 4; // FFMAX((RANGE + 32)/64, 2);
175 p->vlc_state[j].bias = 0;
176 p->vlc_state[j].count = 1;
183 av_cold int ffv1_common_end(AVCodecContext *avctx)
185 FFV1Context *s = avctx->priv_data;
188 if (avctx->codec->decode && s->picture.data[0])
189 avctx->release_buffer(avctx, &s->picture);
190 if (avctx->codec->decode && s->last_picture.data[0])
191 avctx->release_buffer(avctx, &s->last_picture);
193 for (j = 0; j < s->slice_count; j++) {
194 FFV1Context *fs = s->slice_context[j];
195 for (i = 0; i < s->plane_count; i++) {
196 PlaneContext *p = &fs->plane[i];
199 av_freep(&p->vlc_state);
201 av_freep(&fs->sample_buffer);
204 av_freep(&avctx->stats_out);
205 for (j = 0; j < s->quant_table_count; j++) {
206 av_freep(&s->initial_states[j]);
207 for (i = 0; i < s->slice_count; i++) {
208 FFV1Context *sf = s->slice_context[i];
209 av_freep(&sf->rc_stat2[j]);
211 av_freep(&s->rc_stat2[j]);
214 for (i = 0; i < s->slice_count; i++)
215 av_freep(&s->slice_context[i]);