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/*
* FFV1 codec for libavcodec
* |
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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.
*
* 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
* 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
* 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 |
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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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/** |
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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/crc.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timer.h" |
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#include "avcodec.h" |
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#include "internal.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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|
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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;
s->flags = avctx->flags; |
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|
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s->picture.f = av_frame_alloc(); |
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s->last_picture.f = av_frame_alloc(); |
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if (!s->picture.f || !s->last_picture.f)
return AVERROR(ENOMEM); |
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|
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ff_dsputil_init(&s->dsp, avctx); |
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|
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s->width = avctx->width;
s->height = avctx->height; |
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|
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// defaults
s->num_h_slices = 1;
s->num_v_slices = 1; |
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|
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return 0;
}
|
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av_cold int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs) |
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{ |
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int j; |
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|
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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); |
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} |
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} |
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|
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if (fs->ac > 1) {
//FIXME only redo if state_transition changed
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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}
}
return 0;
}
|
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av_cold int ffv1_init_slices_state(FFV1Context *f) |
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{
int i, ret; |
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for (i = 0; i < f->slice_count; i++) {
FFV1Context *fs = f->slice_context[i]; |
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if ((ret = ffv1_init_slice_state(f, fs)) < 0)
return AVERROR(ENOMEM); |
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}
return 0;
}
|
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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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av_assert0(f->slice_count > 0); |
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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; |
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if (!fs)
return AVERROR(ENOMEM);
|
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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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|
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fs->slice_width = sxe - sxs;
fs->slice_height = sye - sys;
fs->slice_x = sxs;
fs->slice_y = sys; |
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|
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fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) * |
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sizeof(*fs->sample_buffer)); |
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if (!fs->sample_buffer)
return AVERROR(ENOMEM);
}
return 0;
}
|
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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++) {
f->initial_states[i] = av_malloc(f->context_count[i] *
sizeof(*f->initial_states[i]));
if (!f->initial_states[i]) |
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return AVERROR(ENOMEM); |
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memset(f->initial_states[i], 128,
f->context_count[i] * sizeof(*f->initial_states[i])); |
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}
return 0;
}
|
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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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|
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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; |
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} |
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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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|
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if (s->picture.f)
ff_thread_release_buffer(avctx, &s->picture);
av_frame_free(&s->picture.f);
if (s->last_picture.f)
ff_thread_release_buffer(avctx, &s->last_picture);
av_frame_free(&s->last_picture.f); |
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|
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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]; |
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|
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av_freep(&p->state);
av_freep(&p->vlc_state);
} |
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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++) {
FFV1Context *sf = s->slice_context[i]; |
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av_freep(&sf->rc_stat2[j]);
} |
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av_freep(&s->rc_stat2[j]); |
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} |
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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;
} |