FFmpeg: libavformat/sauce.c Source File

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libavformat

sauce.c

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1 /*

2 * SAUCE header parser

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 /**

23 * @file

24 * SAUCE header parser

25 */

27 #include "libavutil/intreadwrite.h"

28 #include "libavutil/dict.h"

29 #include "avformat.h"

30 #include "sauce.h"

32 int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)

33 {

34 AVIOContext *pb = avctx->pb;

35 char buf[36];

36 int datatype, filetype, t1, t2, nb_comments;

37 uint64_t start_pos = avio_size(pb) - 128;

39 avio_seek(pb, start_pos, SEEK_SET);

40 if (avio_read(pb, buf, 7) != 7)

41 return -1;

42 if (memcmp(buf, "SAUCE00", 7))

43 return -1;

45 #define GET_SAUCE_META(name,size) \

46 if (avio_read(pb, buf, size) == size && buf[0]) { \

47 buf[size] = 0; \

48 av_dict_set(&avctx->metadata, name, buf, 0); \

49 }

51 GET_SAUCE_META("title", 35)

52 GET_SAUCE_META("artist", 20)

53 GET_SAUCE_META("publisher", 20)

54 GET_SAUCE_META("date", 8)

55 avio_skip(pb, 4);

56 datatype = avio_r8(pb);

57 filetype = avio_r8(pb);

58 t1 = avio_rl16(pb);

59 t2 = avio_rl16(pb);

60 nb_comments = avio_r8(pb);

61 avio_skip(pb, 1); /* flags */

62 avio_skip(pb, 4);

63 GET_SAUCE_META("encoder", 22);

65 if (got_width && datatype && filetype) {

66 if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) {

67 if (t1) {

68 avctx->streams[0]->codec->width = t1<<3;

69 *got_width = 1;

70 }

71 if (get_height && t2)

72 avctx->streams[0]->codec->height = t2<<4;

73 } else if (datatype == 5) {

74 if (filetype) {

75 avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4;

76 *got_width = 1;

77 }

78 if (get_height && t2)

79 avctx->streams[0]->codec->height = t2<<4;

80 }

81 }

83 *fsize -= 128;

85 if (nb_comments > 0) {

86 avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);

87 if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) {

88 int i;

89 char *str = av_malloc(65*nb_comments + 1);

90 *fsize -= 64*nb_comments + 5;

91 if (!str)

92 return 0;

93 for (i = 0; i < nb_comments; i++) {

94 if (avio_read(pb, str + 65*i, 64) != 64)

95 break;

96 str[65*i + 64] = '\n';

97 }

98 str[65*i] = 0;

99 av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL);

100 }

101 }

102

103 return 0;

104 }

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