FFmpeg: libavformat/txd.c Source File

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libavformat

txd.c

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1 /*

2 * Renderware TeXture Dictionary (.txd) demuxer

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 #include "libavutil/intreadwrite.h"

23 #include "avformat.h"

25 #define TXD_FILE 0x16

26 #define TXD_INFO 0x01

27 #define TXD_EXTRA 0x03

28 #define TXD_TEXTURE 0x15

29 #define TXD_TEXTURE_DATA 0x01

30 #define TXD_MARKER 0x1803ffff

31 #define TXD_MARKER2 0x1003ffff

33 static int txd_probe(AVProbeData * pd) {

34 if (AV_RL32(pd->buf ) == TXD_FILE &&

35 (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))

36 return AVPROBE_SCORE_MAX;

37 return 0;

38 }

40 static int txd_read_header(AVFormatContext *s) {

41 AVStream *st;

43 st = avformat_new_stream(s, NULL);

44 if (!st)

45 return AVERROR(ENOMEM);

46 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

47 st->codec->codec_id = AV_CODEC_ID_TXD;

48 st->codec->time_base.den = 5;

49 st->codec->time_base.num = 1;

50 /* the parameters will be extracted from the compressed bitstream */

52 return 0;

53 }

55 static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {

56 AVIOContext *pb = s->pb;

57 unsigned int id, chunk_size, marker;

58 int ret;

60 next_chunk:

61 id = avio_rl32(pb);

62 chunk_size = avio_rl32(pb);

63 marker = avio_rl32(pb);

65 if (url_feof(s->pb))

66 return AVERROR_EOF;

67 if (marker != TXD_MARKER && marker != TXD_MARKER2) {

68 av_log(s, AV_LOG_ERROR, "marker does not match\n");

69 return AVERROR_INVALIDDATA;

70 }

72 switch (id) {

73 case TXD_INFO:

74 if (chunk_size > 100)

75 break;

76 case TXD_EXTRA:

77 avio_skip(s->pb, chunk_size);

78 case TXD_FILE:

79 case TXD_TEXTURE:

80 goto next_chunk;

81 default:

82 av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);

83 return AVERROR_INVALIDDATA;

84 }

86 ret = av_get_packet(s->pb, pkt, chunk_size);

87 if (ret < 0)

88 return ret;

89 pkt->stream_index = 0;

91 return 0;

92 }

94 AVInputFormat ff_txd_demuxer = {

95 .name = "txd",

96 .long_name = NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),

97 .read_probe = txd_probe,

98 .read_header = txd_read_header,

99 .read_packet = txd_read_packet,

100 };

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