/* * FFV1 codec for libavcodec * * Copyright (c) 2003-2012 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/avassert.h" #include "libavutil/crc.h" #include "libavutil/opt.h" #include "libavutil/imgutils.h" #include "libavutil/pixdesc.h" #include "libavutil/timer.h" #include "avcodec.h" #include "internal.h" #include "rangecoder.h" #include "golomb.h" #include "mathops.h" #include "ffv1.h" av_cold int 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; avcodec_get_frame_defaults(&s->picture); ff_dsputil_init(&s->dsp, avctx); s->width = avctx->width; s->height = avctx->height; // defaults s->num_h_slices = 1; s->num_v_slices = 1; return 0; } int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs) { int j; fs->plane_count = f->plane_count; fs->transparency = f->transparency; for (j = 0; j < f->plane_count; j++) { PlaneContext *const p = &fs->plane[j]; if (fs->ac) { if (!p->state) p->state = av_malloc(CONTEXT_SIZE * p->context_count * sizeof(uint8_t)); if (!p->state) return AVERROR(ENOMEM); } else { if (!p->vlc_state) p->vlc_state = av_malloc(p->context_count * sizeof(VlcState)); if (!p->vlc_state) return AVERROR(ENOMEM); } } if (fs->ac > 1) { //FIXME only redo if state_transition changed for (j = 1; j < 256; j++) { fs->c. one_state[ j] = f->state_transition[j]; fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j]; } } return 0; } int ffv1_init_slices_state(FFV1Context *f) { int i, ret; for (i = 0; i < f->slice_count; i++) { FFV1Context *fs = f->slice_context[i]; if ((ret = ffv1_init_slice_state(f, fs)) < 0) return AVERROR(ENOMEM); } return 0; } av_cold int ffv1_init_slice_contexts(FFV1Context *f) { int i; f->slice_count = f->num_h_slices * f->num_v_slices; av_assert0(f->slice_count > 0); for (i = 0; i < f->slice_count; i++) { FFV1Context *fs = av_mallocz(sizeof(*fs)); 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; if (!fs) return AVERROR(ENOMEM); f->slice_context[i] = fs; memcpy(fs, f, sizeof(*fs)); memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2)); fs->slice_width = sxe - sxs; fs->slice_height = sye - sys; fs->slice_x = sxs; fs->slice_y = sys; fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) * sizeof(*fs->sample_buffer)); if (!fs->sample_buffer) return AVERROR(ENOMEM); } return 0; } int ffv1_allocate_initial_states(FFV1Context *f) { int i; for (i = 0; i < f->quant_table_count; i++) { f->initial_states[i] = av_malloc(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 ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs) { int i, j; for (i = 0; i < f->plane_count; i++) { PlaneContext *p = &fs->plane[i]; p->interlace_bit_state[0] = 128; p->interlace_bit_state[1] = 128; if (fs->ac) { 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 ffv1_close(AVCodecContext *avctx) { FFV1Context *s = avctx->priv_data; int i, j; av_frame_unref(&s->last_picture); for (j = 0; j < s->slice_count; j++) { FFV1Context *fs = s->slice_context[j]; for (i = 0; i < s->plane_count; i++) { PlaneContext *p = &fs->plane[i]; av_freep(&p->state); av_freep(&p->vlc_state); } av_freep(&fs->sample_buffer); } 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->slice_count; i++) { FFV1Context *sf = s->slice_context[i]; av_freep(&sf->rc_stat2[j]); } av_freep(&s->rc_stat2[j]); } for (i = 0; i < s->slice_count; i++) av_freep(&s->slice_context[i]); return 0; }