yading@10: /*
yading@10:  * FFV1 codec for libavcodec
yading@10:  *
yading@10:  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * FF Video Codec 1 (a lossless codec)
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/crc.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/timer.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "rangecoder.h"
yading@10: #include "golomb.h"
yading@10: #include "mathops.h"
yading@10: #include "ffv1.h"
yading@10: 
yading@10: av_cold int ffv1_common_init(AVCodecContext *avctx)
yading@10: {
yading@10:     FFV1Context *s = avctx->priv_data;
yading@10: 
yading@10:     if (!avctx->width || !avctx->height)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10:     s->flags = avctx->flags;
yading@10: 
yading@10:     avcodec_get_frame_defaults(&s->picture);
yading@10: 
yading@10:     ff_dsputil_init(&s->dsp, avctx);
yading@10: 
yading@10:     s->width  = avctx->width;
yading@10:     s->height = avctx->height;
yading@10: 
yading@10:     // defaults
yading@10:     s->num_h_slices = 1;
yading@10:     s->num_v_slices = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
yading@10: {
yading@10:     int j;
yading@10: 
yading@10:     fs->plane_count  = f->plane_count;
yading@10:     fs->transparency = f->transparency;
yading@10:     for (j = 0; j < f->plane_count; j++) {
yading@10:         PlaneContext *const p = &fs->plane[j];
yading@10: 
yading@10:         if (fs->ac) {
yading@10:             if (!p->state)
yading@10:                 p->state = av_malloc(CONTEXT_SIZE * p->context_count *
yading@10:                                      sizeof(uint8_t));
yading@10:             if (!p->state)
yading@10:                 return AVERROR(ENOMEM);
yading@10:         } else {
yading@10:             if (!p->vlc_state)
yading@10:                 p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
yading@10:             if (!p->vlc_state)
yading@10:                 return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (fs->ac > 1) {
yading@10:         //FIXME only redo if state_transition changed
yading@10:         for (j = 1; j < 256; j++) {
yading@10:             fs->c. one_state[      j] = f->state_transition[j];
yading@10:             fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ffv1_init_slices_state(FFV1Context *f)
yading@10: {
yading@10:     int i, ret;
yading@10:     for (i = 0; i < f->slice_count; i++) {
yading@10:         FFV1Context *fs = f->slice_context[i];
yading@10:         if ((ret = ffv1_init_slice_state(f, fs)) < 0)
yading@10:             return AVERROR(ENOMEM);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: av_cold int ffv1_init_slice_contexts(FFV1Context *f)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     f->slice_count = f->num_h_slices * f->num_v_slices;
yading@10:     av_assert0(f->slice_count > 0);
yading@10: 
yading@10:     for (i = 0; i < f->slice_count; i++) {
yading@10:         FFV1Context *fs = av_mallocz(sizeof(*fs));
yading@10:         int sx          = i % f->num_h_slices;
yading@10:         int sy          = i / f->num_h_slices;
yading@10:         int sxs         = f->avctx->width  *  sx      / f->num_h_slices;
yading@10:         int sxe         = f->avctx->width  * (sx + 1) / f->num_h_slices;
yading@10:         int sys         = f->avctx->height *  sy      / f->num_v_slices;
yading@10:         int sye         = f->avctx->height * (sy + 1) / f->num_v_slices;
yading@10: 
yading@10:         if (!fs)
yading@10:             return AVERROR(ENOMEM);
yading@10: 
yading@10:         f->slice_context[i] = fs;
yading@10:         memcpy(fs, f, sizeof(*fs));
yading@10:         memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
yading@10: 
yading@10:         fs->slice_width  = sxe - sxs;
yading@10:         fs->slice_height = sye - sys;
yading@10:         fs->slice_x      = sxs;
yading@10:         fs->slice_y      = sys;
yading@10: 
yading@10:         fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
yading@10:                                       sizeof(*fs->sample_buffer));
yading@10:         if (!fs->sample_buffer)
yading@10:             return AVERROR(ENOMEM);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ffv1_allocate_initial_states(FFV1Context *f)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < f->quant_table_count; i++) {
yading@10:         f->initial_states[i] = av_malloc(f->context_count[i] *
yading@10:                                          sizeof(*f->initial_states[i]));
yading@10:         if (!f->initial_states[i])
yading@10:             return AVERROR(ENOMEM);
yading@10:         memset(f->initial_states[i], 128,
yading@10:                f->context_count[i] * sizeof(*f->initial_states[i]));
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
yading@10: {
yading@10:     int i, j;
yading@10: 
yading@10:     for (i = 0; i < f->plane_count; i++) {
yading@10:         PlaneContext *p = &fs->plane[i];
yading@10: 
yading@10:         p->interlace_bit_state[0] = 128;
yading@10:         p->interlace_bit_state[1] = 128;
yading@10: 
yading@10:         if (fs->ac) {
yading@10:             if (f->initial_states[p->quant_table_index]) {
yading@10:                 memcpy(p->state, f->initial_states[p->quant_table_index],
yading@10:                        CONTEXT_SIZE * p->context_count);
yading@10:             } else
yading@10:                 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
yading@10:         } else {
yading@10:             for (j = 0; j < p->context_count; j++) {
yading@10:                 p->vlc_state[j].drift     = 0;
yading@10:                 p->vlc_state[j].error_sum = 4;    //FFMAX((RANGE + 32)/64, 2);
yading@10:                 p->vlc_state[j].bias      = 0;
yading@10:                 p->vlc_state[j].count     = 1;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: av_cold int ffv1_close(AVCodecContext *avctx)
yading@10: {
yading@10:     FFV1Context *s = avctx->priv_data;
yading@10:     int i, j;
yading@10: 
yading@10:     av_frame_unref(&s->last_picture);
yading@10: 
yading@10:     for (j = 0; j < s->slice_count; j++) {
yading@10:         FFV1Context *fs = s->slice_context[j];
yading@10:         for (i = 0; i < s->plane_count; i++) {
yading@10:             PlaneContext *p = &fs->plane[i];
yading@10: 
yading@10:             av_freep(&p->state);
yading@10:             av_freep(&p->vlc_state);
yading@10:         }
yading@10:         av_freep(&fs->sample_buffer);
yading@10:     }
yading@10: 
yading@10:     av_freep(&avctx->stats_out);
yading@10:     for (j = 0; j < s->quant_table_count; j++) {
yading@10:         av_freep(&s->initial_states[j]);
yading@10:         for (i = 0; i < s->slice_count; i++) {
yading@10:             FFV1Context *sf = s->slice_context[i];
yading@10:             av_freep(&sf->rc_stat2[j]);
yading@10:         }
yading@10:         av_freep(&s->rc_stat2[j]);
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < s->slice_count; i++)
yading@10:         av_freep(&s->slice_context[i]);
yading@10: 
yading@10:     return 0;
yading@10: }