mirror of https://git.ffmpeg.org/ffmpeg.git
219 lines
6.4 KiB
C
219 lines
6.4 KiB
C
/*
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* FFV1 codec for libavcodec
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*
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* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* FF Video Codec 1 (a lossless codec)
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/crc.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/timer.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "dsputil.h"
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#include "rangecoder.h"
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#include "golomb.h"
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#include "mathops.h"
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#include "ffv1.h"
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av_cold int ffv1_common_init(AVCodecContext *avctx)
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{
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FFV1Context *s = avctx->priv_data;
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if (!avctx->width || !avctx->height)
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return AVERROR_INVALIDDATA;
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s->avctx = avctx;
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s->flags = avctx->flags;
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avcodec_get_frame_defaults(&s->picture);
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ff_dsputil_init(&s->dsp, avctx);
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s->width = avctx->width;
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s->height = avctx->height;
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// defaults
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s->num_h_slices = 1;
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s->num_v_slices = 1;
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return 0;
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}
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int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
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{
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int j;
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fs->plane_count = f->plane_count;
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fs->transparency = f->transparency;
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for (j = 0; j < f->plane_count; j++) {
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PlaneContext *const p = &fs->plane[j];
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if (fs->ac) {
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if (!p->state)
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p->state = av_malloc(CONTEXT_SIZE * p->context_count *
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sizeof(uint8_t));
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if (!p->state)
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return AVERROR(ENOMEM);
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} else {
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if (!p->vlc_state)
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p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
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if (!p->vlc_state)
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return AVERROR(ENOMEM);
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}
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}
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if (fs->ac > 1) {
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// FIXME: only redo if state_transition changed
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for (j = 1; j < 256; j++) {
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fs->c. one_state[ j] = f->state_transition[j];
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fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
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}
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}
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return 0;
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}
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int ffv1_init_slices_state(FFV1Context *f) {
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int i;
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for (i = 0; i < f->slice_count; i++) {
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FFV1Context *fs = f->slice_context[i];
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if (ffv1_init_slice_state(f, fs) < 0)
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return -1;
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}
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return 0;
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}
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av_cold int ffv1_init_slice_contexts(FFV1Context *f)
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{
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int i;
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f->slice_count = f->num_h_slices * f->num_v_slices;
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for (i = 0; i < f->slice_count; i++) {
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FFV1Context *fs = av_mallocz(sizeof(*fs));
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int sx = i % f->num_h_slices;
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int sy = i / f->num_h_slices;
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int sxs = f->avctx->width * sx / f->num_h_slices;
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int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
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int sys = f->avctx->height * sy / f->num_v_slices;
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int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
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f->slice_context[i] = fs;
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memcpy(fs, f, sizeof(*fs));
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memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
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fs->slice_width = sxe - sxs;
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fs->slice_height = sye - sys;
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fs->slice_x = sxs;
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fs->slice_y = sys;
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fs->sample_buffer = av_malloc(3*4 * (fs->width+6) * sizeof(*fs->sample_buffer));
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if (!fs->sample_buffer)
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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int ffv1_allocate_initial_states(FFV1Context *f)
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{
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int i;
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for (i = 0; i < f->quant_table_count; i++) {
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f->initial_states[i] = av_malloc(f->context_count[i] *
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sizeof(*f->initial_states[i]));
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if (!f->initial_states[i])
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return AVERROR(ENOMEM);
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memset(f->initial_states[i], 128,
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f->context_count[i] * sizeof(*f->initial_states[i]));
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}
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return 0;
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}
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void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
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{
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int i, j;
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for (i = 0; i < f->plane_count; i++) {
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PlaneContext *p = &fs->plane[i];
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p->interlace_bit_state[0] = 128;
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p->interlace_bit_state[1] = 128;
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if (fs->ac) {
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if (f->initial_states[p->quant_table_index]) {
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memcpy(p->state, f->initial_states[p->quant_table_index],
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CONTEXT_SIZE * p->context_count);
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} else
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memset(p->state, 128, CONTEXT_SIZE * p->context_count);
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} else {
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for (j = 0; j < p->context_count; j++) {
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p->vlc_state[j].drift = 0;
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p->vlc_state[j].error_sum = 4; // FFMAX((RANGE + 32)/64, 2);
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p->vlc_state[j].bias = 0;
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p->vlc_state[j].count = 1;
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}
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}
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}
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}
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av_cold int ffv1_close(AVCodecContext *avctx)
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{
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FFV1Context *s = avctx->priv_data;
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int i, j;
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if (avctx->codec->decode && s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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if (avctx->codec->decode && s->last_picture.data[0])
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avctx->release_buffer(avctx, &s->last_picture);
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for (j = 0; j < s->slice_count; j++) {
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FFV1Context *fs = s->slice_context[j];
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for (i = 0; i < s->plane_count; i++) {
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PlaneContext *p = &fs->plane[i];
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av_freep(&p->state);
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av_freep(&p->vlc_state);
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}
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av_freep(&fs->sample_buffer);
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}
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av_freep(&avctx->stats_out);
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for (j = 0; j < s->quant_table_count; j++) {
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av_freep(&s->initial_states[j]);
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for (i = 0; i < s->slice_count; i++) {
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FFV1Context *sf = s->slice_context[i];
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av_freep(&sf->rc_stat2[j]);
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}
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av_freep(&s->rc_stat2[j]);
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}
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for (i = 0; i < s->slice_count; i++)
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av_freep(&s->slice_context[i]);
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return 0;
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}
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