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/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* FF Video Codec 1 (a lossless codec)
*/
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "ffv1.h"
av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
if (!avctx->width || !avctx->height)
return AVERROR_INVALIDDATA;
s->avctx = avctx;
s->flags = avctx->flags;
s->width = avctx->width;
s->height = avctx->height;
// defaults
s->num_h_slices = 1;
s->num_v_slices = 1;
return 0;
}
av_cold int ff_ffv1_init_slice_state(const FFV1Context *f,
FFV1SliceContext *sc)
{
int j, i;
for (j = 0; j < f->plane_count; j++) {
PlaneContext *const p = &sc->plane[j];
if (f->ac != AC_GOLOMB_RICE) {
if (!p->state)
p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
sizeof(uint8_t));
if (!p->state)
return AVERROR(ENOMEM);
} else {
if (!p->vlc_state) {
p->vlc_state = av_calloc(p->context_count, sizeof(*p->vlc_state));
if (!p->vlc_state)
return AVERROR(ENOMEM);
for (i = 0; i < p->context_count; i++) {
p->vlc_state[i].error_sum = 4;
p->vlc_state[i].count = 1;
}
}
}
}
if (f->ac == AC_RANGE_CUSTOM_TAB) {
//FIXME only redo if state_transition changed
for (j = 1; j < 256; j++) {
sc->c. one_state[ j] = f->state_transition[j];
sc->c.zero_state[256 - j] = 256 - sc->c.one_state[j];
}
}
return 0;
}
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
{
int i, ret;
for (i = 0; i < f->max_slice_count; i++) {
if ((ret = ff_ffv1_init_slice_state(f, &f->slices[i])) < 0)
return AVERROR(ENOMEM);
}
return 0;
}
av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
{
int i, max_slice_count = f->num_h_slices * f->num_v_slices;
av_assert0(max_slice_count > 0);
f->slices = av_calloc(max_slice_count, sizeof(*f->slices));
if (!f->slices)
return AVERROR(ENOMEM);
f->max_slice_count = max_slice_count;
for (i = 0; i < max_slice_count;) {
FFV1SliceContext *sc = &f->slices[i];
int sx = i % f->num_h_slices;
int sy = i / f->num_h_slices;
int sxs = f->avctx->width * sx / f->num_h_slices;
int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
int sys = f->avctx->height * sy / f->num_v_slices;
int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
FFV1Context *fs = av_mallocz(sizeof(*fs));
if (!fs)
return AVERROR(ENOMEM);
f->slice_context[i++] = fs;
memcpy(fs, f, sizeof(*fs));
sc->slice_width = sxe - sxs;
sc->slice_height = sye - sys;
sc->slice_x = sxs;
sc->slice_y = sys;
sc->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
sizeof(*sc->sample_buffer));
sc->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
sizeof(*sc->sample_buffer32));
if (!sc->sample_buffer || !sc->sample_buffer32)
return AVERROR(ENOMEM);
}
return 0;
}
int ff_ffv1_allocate_initial_states(FFV1Context *f)
{
int i;
for (i = 0; i < f->quant_table_count; i++) {
f->initial_states[i] = av_malloc_array(f->context_count[i],
sizeof(*f->initial_states[i]));
if (!f->initial_states[i])
return AVERROR(ENOMEM);
memset(f->initial_states[i], 128,
f->context_count[i] * sizeof(*f->initial_states[i]));
}
return 0;
}
void ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1SliceContext *sc)
{
int i, j;
for (i = 0; i < f->plane_count; i++) {
PlaneContext *p = &sc->plane[i];
if (f->ac != AC_GOLOMB_RICE) {
if (f->initial_states[p->quant_table_index]) {
memcpy(p->state, f->initial_states[p->quant_table_index],
CONTEXT_SIZE * p->context_count);
} else
memset(p->state, 128, CONTEXT_SIZE * p->context_count);
} else {
for (j = 0; j < p->context_count; j++) {
p->vlc_state[j].drift = 0;
p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
p->vlc_state[j].bias = 0;
p->vlc_state[j].count = 1;
}
}
}
}
av_cold int ff_ffv1_close(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i, j;
for (j = 0; j < s->max_slice_count; j++) {
FFV1SliceContext *sc = &s->slices[j];
av_freep(&sc->sample_buffer);
av_freep(&sc->sample_buffer32);
for (i = 0; i < s->plane_count; i++) {
PlaneContext *p = &sc->plane[i];
av_freep(&p->state);
av_freep(&p->vlc_state);
}
}
av_freep(&avctx->stats_out);
for (j = 0; j < s->quant_table_count; j++) {
av_freep(&s->initial_states[j]);
for (i = 0; i < s->max_slice_count; i++) {
FFV1SliceContext *sc = &s->slices[i];
av_freep(&sc->rc_stat2[j]);
}
av_freep(&s->rc_stat2[j]);
}
for (i = 0; i < s->max_slice_count; i++)
av_freep(&s->slice_context[i]);
av_freep(&s->slices);
return 0;
}
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