mirror of https://git.ffmpeg.org/ffmpeg.git
255 lines
7.5 KiB
C
255 lines
7.5 KiB
C
/*
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* FFV1 codec for libavcodec
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*
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* Copyright (c) 2003-2013 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/attributes.h"
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#include "libavutil/avassert.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "ffv1.h"
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#include "refstruct.h"
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av_cold int ff_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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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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static void planes_free(FFRefStructOpaque opaque, void *obj)
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{
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PlaneContext *planes = obj;
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for (int i = 0; i < MAX_PLANES; i++) {
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PlaneContext *p = &planes[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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}
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PlaneContext* ff_ffv1_planes_alloc(void)
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{
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return ff_refstruct_alloc_ext(sizeof(PlaneContext) * MAX_PLANES,
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0, NULL, planes_free);
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}
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av_cold int ff_ffv1_init_slice_state(const FFV1Context *f,
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FFV1SliceContext *sc)
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{
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int j, i;
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for (j = 0; j < f->plane_count; j++) {
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PlaneContext *const p = &sc->plane[j];
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if (f->ac != AC_GOLOMB_RICE) {
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if (!p->state)
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p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
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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_calloc(p->context_count, sizeof(*p->vlc_state));
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if (!p->vlc_state)
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return AVERROR(ENOMEM);
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for (i = 0; i < p->context_count; i++) {
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p->vlc_state[i].error_sum = 4;
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p->vlc_state[i].count = 1;
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}
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}
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}
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}
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if (f->ac == AC_RANGE_CUSTOM_TAB) {
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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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sc->c. one_state[ j] = f->state_transition[j];
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sc->c.zero_state[256 - j] = 256 - sc->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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av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
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{
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int i, ret;
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for (i = 0; i < f->max_slice_count; i++) {
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if ((ret = ff_ffv1_init_slice_state(f, &f->slices[i])) < 0)
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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 ff_need_new_slices(int width, int num_h_slices, int chroma_shift) {
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int mpw = 1<<chroma_shift;
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int i = width * (int64_t)(num_h_slices - 1) / num_h_slices;
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return width % mpw && (width - i) % mpw == 0;
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}
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int ff_slice_coord(const FFV1Context *f, int width, int sx, int num_h_slices, int chroma_shift) {
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int mpw = 1<<chroma_shift;
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int awidth = FFALIGN(width, mpw);
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if (f->version < 4 || f->version == 4 && f->micro_version < 3)
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return width * sx / num_h_slices;
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sx = (2LL * awidth * sx + num_h_slices * mpw) / (2 * num_h_slices * mpw) * mpw;
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if (sx == awidth)
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sx = width;
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return sx;
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}
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av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
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{
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int max_slice_count = f->num_h_slices * f->num_v_slices;
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av_assert0(max_slice_count > 0);
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f->slices = av_calloc(max_slice_count, sizeof(*f->slices));
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if (!f->slices)
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return AVERROR(ENOMEM);
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f->max_slice_count = max_slice_count;
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for (int i = 0; i < max_slice_count; i++) {
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FFV1SliceContext *sc = &f->slices[i];
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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 = ff_slice_coord(f, f->avctx->width , sx , f->num_h_slices, f->chroma_h_shift);
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int sxe = ff_slice_coord(f, f->avctx->width , sx + 1, f->num_h_slices, f->chroma_h_shift);
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int sys = ff_slice_coord(f, f->avctx->height, sy , f->num_v_slices, f->chroma_v_shift);
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int sye = ff_slice_coord(f, f->avctx->height, sy + 1, f->num_v_slices, f->chroma_v_shift);
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sc->slice_width = sxe - sxs;
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sc->slice_height = sye - sys;
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sc->slice_x = sxs;
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sc->slice_y = sys;
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sc->sx = sx;
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sc->sy = sy;
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sc->sample_buffer = av_malloc_array((f->width + 6), 3 * MAX_PLANES *
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sizeof(*sc->sample_buffer));
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sc->sample_buffer32 = av_malloc_array((f->width + 6), 3 * MAX_PLANES *
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sizeof(*sc->sample_buffer32));
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if (!sc->sample_buffer || !sc->sample_buffer32)
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return AVERROR(ENOMEM);
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sc->plane = ff_ffv1_planes_alloc();
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if (!sc->plane)
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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 ff_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_array(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 ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1SliceContext *sc)
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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 = &sc->plane[i];
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if (f->ac != AC_GOLOMB_RICE) {
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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 ff_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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for (j = 0; j < s->max_slice_count; j++) {
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FFV1SliceContext *sc = &s->slices[j];
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av_freep(&sc->sample_buffer);
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av_freep(&sc->sample_buffer32);
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ff_refstruct_unref(&sc->plane);
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}
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ff_refstruct_unref(&s->slice_damaged);
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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->max_slice_count; i++) {
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FFV1SliceContext *sc = &s->slices[i];
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av_freep(&sc->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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av_freep(&s->slices);
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return 0;
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}
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