FFmpeg: libavformat/data_uri.c Source File

FFmpeg

[フレーム]

libavformat

data_uri.c

Go to the documentation of this file.

1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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

7 * modify it under the terms of the GNU Lesser General Public License

8 * as published by the Free Software Foundation; either

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

10 *

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

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

13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

14 * GNU Lesser General Public License for more details.

15 *

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

17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,

18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #include <string.h>

22 #include "libavutil/avstring.h"

23 #include "libavutil/base64.h"

24 #include "url.h"

26 typedef struct {

27 const uint8_t *data;

28 void *tofree;

29 size_t size;

30 size_t pos;

31 } DataContext;

33 static av_cold int data_open(URLContext *h, const char *uri, int flags)

34 {

35 DataContext *dc = h->priv_data;

36 const char *data, *opt, *next;

37 char *ddata;

38 int ret, base64 = 0;

39 size_t in_size;

41 /* data:content/type[;base64],payload */

43 av_strstart(uri, "data:", &uri);

44 data = strchr(uri, ',');

45 if (!data) {

46 av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n");

47 return AVERROR(EINVAL);

48 }

49 opt = uri;

50 while (opt < data) {

51 next = av_x_if_null(memchr(opt, ';', data - opt), data);

52 if (opt == uri) {

53 if (!memchr(opt, '/', next - opt)) { /* basic validity check */

54 av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n",

55 (int)(next - opt), opt);

56 return AVERROR(EINVAL);

57 }

58 av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",

59 (int)(next - opt), opt);

60 } else {

61 if (!av_strncasecmp(opt, "base64", next - opt)) {

62 base64 = 1;

63 } else {

64 av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",

65 (int)(next - opt), opt);

66 }

67 }

68 opt = next + 1;

69 }

71 data++;

72 in_size = strlen(data);

73 if (base64) {

74 size_t out_size = 3 * (in_size / 4) + 1;

76 if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))

77 return AVERROR(ENOMEM);

78 if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {

79 av_free(ddata);

80 av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n");

81 return ret;

82 }

83 dc->data = dc->tofree = ddata;

84 dc->size = ret;

85 } else {

86 dc->data = data;

87 dc->size = in_size;

88 }

89 return 0;

90 }

92 static av_cold int data_close(URLContext *h)

93 {

94 DataContext *dc = h->priv_data;

96 av_freep(&dc->tofree);

97 return 0;

98 }

100 static int data_read(URLContext *h, unsigned char *buf, int size)

101 {

102 DataContext *dc = h->priv_data;

103

104 if (dc->pos >= dc->size)

105 return AVERROR_EOF;

106 size = FFMIN(size, dc->size - dc->pos);

107 memcpy(buf, dc->data + dc->pos, size);

108 dc->pos += size;

109 return size;

110 }

111

112 URLProtocol ff_data_protocol = {

113 .name = "data",

114 .url_open = data_open,

115 .url_close = data_close,

116 .url_read = data_read,

117 .priv_data_size = sizeof(DataContext),

118 };

Generated on Sat May 25 2013 03:58:46 for FFmpeg by doxygen 1.8.2