FFmpeg/libavcodec/ffv1.c
Andreas Rheinhardt fe63b3eedc avcodec/ffv1: Simplify cleanup after allocation failure
Now that ff_ffv1_close() is called upon failure for both the FFV1 encoder
and decoder, the code contained therein can be used to free the partially
allocated slice contexts if allocating the slice contexts failed. One just
has to set the correct number of slice contexts on error. This allows to
remove the code for freeing partially allocated slice contexts in
ff_ffv1_init_slice_contexts().

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-09-17 00:09:08 +02:00

241 lines
7.0 KiB
C

/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003-2013 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/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "internal.h"
#include "rangecoder.h"
#include "mathops.h"
#include "ffv1.h"
av_cold int ff_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;
s->picture.f = av_frame_alloc();
s->last_picture.f = av_frame_alloc();
if (!s->picture.f || !s->last_picture.f)
return AVERROR(ENOMEM);
s->width = avctx->width;
s->height = avctx->height;
// defaults
s->num_h_slices = 1;
s->num_v_slices = 1;
return 0;
}
av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
{
int j, i;
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 != AC_GOLOMB_RICE) {
if (!p->state)
p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
sizeof(uint8_t));
if (!p->state)
return AVERROR(ENOMEM);
} else {
if (!p->vlc_state) {
p->vlc_state = av_mallocz_array(p->context_count, sizeof(VlcState));
if (!p->vlc_state)
return AVERROR(ENOMEM);
for (i = 0; i < p->context_count; i++) {
p->vlc_state[i].error_sum = 4;
p->vlc_state[i].count = 1;
}
}
}
}
if (fs->ac == AC_RANGE_CUSTOM_TAB) {
//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;
}
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
{
int i, ret;
for (i = 0; i < f->max_slice_count; i++) {
FFV1Context *fs = f->slice_context[i];
if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
return AVERROR(ENOMEM);
}
return 0;
}
av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
{
int i, max_slice_count = f->num_h_slices * f->num_v_slices;
av_assert0(max_slice_count > 0);
for (i = 0; i < max_slice_count;) {
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;
FFV1Context *fs = av_mallocz(sizeof(*fs));
if (!fs)
goto memfail;
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_array((fs->width + 6), 3 * MAX_PLANES *
sizeof(*fs->sample_buffer));
fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
sizeof(*fs->sample_buffer32));
if (!fs->sample_buffer || !fs->sample_buffer32)
goto memfail;
}
f->max_slice_count = max_slice_count;
return 0;
memfail:
f->max_slice_count = i;
return AVERROR(ENOMEM);
}
int ff_ffv1_allocate_initial_states(FFV1Context *f)
{
int i;
for (i = 0; i < f->quant_table_count; i++) {
f->initial_states[i] = av_malloc_array(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 ff_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 != AC_GOLOMB_RICE) {
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 ff_ffv1_close(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i, j;
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);
for (j = 0; j < s->max_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(&fs->sample_buffer32);
}
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->max_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->max_slice_count; i++)
av_freep(&s->slice_context[i]);
return 0;
}