mirror of
https://github.com/FFmpeg/FFmpeg.git
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103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
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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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#include <stdint.h>
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#include <string.h>
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#include "libavutil/lfg.h"
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#include "libavutil/log.h"
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#include "libavcodec/rangecoder.h"
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#define SIZE 1240
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/**
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* Check if at the current position there is a valid looking termination
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* @param version version 0 requires the decoder to know the data size in bytes
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* version 1 needs about 1 bit more space but does not need to
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* carry the size from encoder to decoder
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* @returns negative AVERROR code on error or non negative.
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*/
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static int rac_check_termination(RangeCoder *c, int version)
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{
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if (version == 1) {
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RangeCoder tmp = *c;
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get_rac(c, (uint8_t[]) { 129 });
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if (c->bytestream == tmp.bytestream && c->bytestream > c->bytestream_start)
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tmp.low -= *--tmp.bytestream;
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tmp.bytestream_end = tmp.bytestream;
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if (get_rac(&tmp, (uint8_t[]) { 129 }))
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return AVERROR_INVALIDDATA;
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} else {
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if (c->bytestream_end != c->bytestream)
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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int main(void)
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{
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RangeCoder c;
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uint8_t b[9 * SIZE] = {0};
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uint8_t r[9 * SIZE];
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int i, p, actual_length, version;
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uint8_t state[10];
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AVLFG prng;
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av_lfg_init(&prng, 1);
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for (version = 0; version < 2; version++) {
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for (p = 0; p< 1024; p++) {
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ff_init_range_encoder(&c, b, SIZE);
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ff_build_rac_states(&c, (1LL << 32) / 20, 128 + 64 + 32 + 16);
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memset(state, 128, sizeof(state));
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for (i = 0; i < SIZE; i++)
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r[i] = av_lfg_get(&prng) % 7;
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for (i = 0; i < SIZE; i++)
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put_rac(&c, state, r[i] & 1);
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actual_length = ff_rac_terminate(&c, version);
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ff_init_range_decoder(&c, b, version ? SIZE : actual_length);
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memset(state, 128, sizeof(state));
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for (i = 0; i < SIZE; i++)
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if ((r[i] & 1) != get_rac(&c, state)) {
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av_log(NULL, AV_LOG_ERROR, "rac failure at %d pass %d version %d\n", i, p, version);
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return 1;
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}
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if (rac_check_termination(&c, version) < 0) {
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av_log(NULL, AV_LOG_ERROR, "rac failure at termination pass %d version %d\n", p, version);
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return 1;
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}
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if (c.bytestream - c.bytestream_start - actual_length != version) {
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av_log(NULL, AV_LOG_ERROR, "rac failure at pass %d version %d\n", p, version);
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return 1;
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}
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}
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}
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return 0;
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}
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