Place qdm2 and truemotion2 in ifdef block so that they can be disabled
[libav.git] / libavformat / crc.c
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1/*
2 * CRC decoder (for codec/format testing)
19720f15 3 * Copyright (c) 2002 Fabrice Bellard.
1c098b2f 4 *
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5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
1c098b2f 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
1c098b2f 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
1c098b2f 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
19#include "avformat.h"
20
21/* adler32.c -- compute the Adler-32 checksum of a data stream
22 * Copyright (C) 1995 Mark Adler
23 * For conditions of distribution and use, see copyright notice in zlib.h
24 */
25
26#define BASE 65521L /* largest prime smaller than 65536 */
27#define NMAX 5552
28/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
29
30#define DO1(buf) {s1 += *buf++; s2 += s1;}
31#define DO2(buf) DO1(buf); DO1(buf);
32#define DO4(buf) DO2(buf); DO2(buf);
33#define DO8(buf) DO4(buf); DO4(buf);
34#define DO16(buf) DO8(buf); DO8(buf);
35
ee9f36a8 36unsigned long update_adler32(unsigned long adler, const uint8_t *buf, unsigned int len)
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37{
38 unsigned long s1 = adler & 0xffff;
39 unsigned long s2 = (adler >> 16) & 0xffff;
40 int k;
41
42 if (buf == NULL) return 1L;
43
44 while (len > 0) {
45 k = len < NMAX ? len : NMAX;
46 len -= k;
47 while (k >= 16) {
48 DO16(buf);
49 k -= 16;
50 }
51 if (k != 0) do {
52 DO1(buf);
53 } while (--k);
54 s1 %= BASE;
55 s2 %= BASE;
56 }
57 return (s2 << 16) | s1;
58}
59
60typedef struct CRCState {
0c1a9eda 61 uint32_t crcval;
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62} CRCState;
63
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64static int crc_write_header(struct AVFormatContext *s)
65{
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66 CRCState *crc = s->priv_data;
67
1c098b2f 68 /* init CRC */
ee9f36a8 69 crc->crcval = update_adler32(0, NULL, 0);
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70
71 return 0;
72}
73
e928649b 74static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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75{
76 CRCState *crc = s->priv_data;
e928649b 77 crc->crcval = update_adler32(crc->crcval, pkt->data, pkt->size);
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78 return 0;
79}
80
81static int crc_write_trailer(struct AVFormatContext *s)
82{
83 CRCState *crc = s->priv_data;
84 char buf[64];
85
86 snprintf(buf, sizeof(buf), "CRC=%08x\n", crc->crcval);
87 put_buffer(&s->pb, buf, strlen(buf));
88 put_flush_packet(&s->pb);
89 return 0;
90}
91
c18a2692 92static AVOutputFormat crc_format = {
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93 "crc",
94 "crc testing format",
95 NULL,
96 "",
c9a65ca8 97 sizeof(CRCState),
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98 CODEC_ID_PCM_S16LE,
99 CODEC_ID_RAWVIDEO,
100 crc_write_header,
101 crc_write_packet,
102 crc_write_trailer,
103};
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104
105int crc_init(void)
106{
107 av_register_output_format(&crc_format);
108 return 0;
109}