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/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 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 = avcodec_alloc_frame();
53 s->last_picture.f = av_frame_alloc();
54 if (!s->picture.f || !s->last_picture.f)
55 return AVERROR(ENOMEM);
56 ff_dsputil_init(&s->dsp, avctx);
58 s->width = avctx->width;
59 s->height = avctx->height;
68 av_cold int 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];
79 p->state = av_malloc(CONTEXT_SIZE * p->context_count *
82 return AVERROR(ENOMEM);
85 p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
87 return AVERROR(ENOMEM);
92 //FIXME only redo if state_transition changed
93 for (j = 1; j < 256; j++) {
94 fs->c. one_state[ j] = f->state_transition[j];
95 fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
102 av_cold int ffv1_init_slices_state(FFV1Context *f)
105 for (i = 0; i < f->slice_count; i++) {
106 FFV1Context *fs = f->slice_context[i];
107 if ((ret = ffv1_init_slice_state(f, fs)) < 0)
108 return AVERROR(ENOMEM);
113 av_cold int ffv1_init_slice_contexts(FFV1Context *f)
117 f->slice_count = f->num_h_slices * f->num_v_slices;
118 av_assert0(f->slice_count > 0);
120 for (i = 0; i < f->slice_count; i++) {
121 FFV1Context *fs = av_mallocz(sizeof(*fs));
122 int sx = i % f->num_h_slices;
123 int sy = i / f->num_h_slices;
124 int sxs = f->avctx->width * sx / f->num_h_slices;
125 int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
126 int sys = f->avctx->height * sy / f->num_v_slices;
127 int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
130 return AVERROR(ENOMEM);
132 f->slice_context[i] = fs;
133 memcpy(fs, f, sizeof(*fs));
134 memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
136 fs->slice_width = sxe - sxs;
137 fs->slice_height = sye - sys;
141 fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
142 sizeof(*fs->sample_buffer));
143 if (!fs->sample_buffer)
144 return AVERROR(ENOMEM);
149 int ffv1_allocate_initial_states(FFV1Context *f)
153 for (i = 0; i < f->quant_table_count; i++) {
154 f->initial_states[i] = av_malloc(f->context_count[i] *
155 sizeof(*f->initial_states[i]));
156 if (!f->initial_states[i])
157 return AVERROR(ENOMEM);
158 memset(f->initial_states[i], 128,
159 f->context_count[i] * sizeof(*f->initial_states[i]));
164 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
168 for (i = 0; i < f->plane_count; i++) {
169 PlaneContext *p = &fs->plane[i];
171 p->interlace_bit_state[0] = 128;
172 p->interlace_bit_state[1] = 128;
175 if (f->initial_states[p->quant_table_index]) {
176 memcpy(p->state, f->initial_states[p->quant_table_index],
177 CONTEXT_SIZE * p->context_count);
179 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
181 for (j = 0; j < p->context_count; j++) {
182 p->vlc_state[j].drift = 0;
183 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
184 p->vlc_state[j].bias = 0;
185 p->vlc_state[j].count = 1;
192 av_cold int ffv1_close(AVCodecContext *avctx)
194 FFV1Context *s = avctx->priv_data;
198 ff_thread_release_buffer(avctx, &s->picture);
199 av_frame_free(&s->picture.f);
201 if (s->last_picture.f)
202 ff_thread_release_buffer(avctx, &s->last_picture);
203 av_frame_free(&s->last_picture.f);
205 for (j = 0; j < s->slice_count; j++) {
206 FFV1Context *fs = s->slice_context[j];
207 for (i = 0; i < s->plane_count; i++) {
208 PlaneContext *p = &fs->plane[i];
211 av_freep(&p->vlc_state);
213 av_freep(&fs->sample_buffer);
216 av_freep(&avctx->stats_out);
217 for (j = 0; j < s->quant_table_count; j++) {
218 av_freep(&s->initial_states[j]);
219 for (i = 0; i < s->slice_count; i++) {
220 FFV1Context *sf = s->slice_context[i];
221 av_freep(&sf->rc_stat2[j]);
223 av_freep(&s->rc_stat2[j]);
226 for (i = 0; i < s->slice_count; i++)
227 av_freep(&s->slice_context[i]);