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"

24 #include "internal.h"

26 #define TXD_FILE 0x16

27 #define TXD_INFO 0x01

28 #define TXD_EXTRA 0x03

29 #define TXD_TEXTURE 0x15

30 #define TXD_TEXTURE_DATA 0x01

31 #define TXD_MARKER 0x1803ffff

32 #define TXD_MARKER2 0x1003ffff

34 static int txd_probe(AVProbeData * pd) {

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

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

37 return AVPROBE_SCORE_MAX;

38 return 0;

39 }

41 static int txd_read_header(AVFormatContext *s) {

42 AVStream *st;

44 st = avformat_new_stream(s, NULL);

45 if (!st)

46 return AVERROR(ENOMEM);

47 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

48 st->codec->codec_id = AV_CODEC_ID_TXD;

49 avpriv_set_pts_info(st, 64, 1, 5);

50 st->avg_frame_rate = av_inv_q(st->time_base);

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

53 return 0;

54 }

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

57 AVIOContext *pb = s->pb;

58 unsigned int id, chunk_size, marker;

59 int ret;

61 next_chunk:

62 id = avio_rl32(pb);

63 chunk_size = avio_rl32(pb);

64 marker = avio_rl32(pb);

66 if (avio_feof(s->pb))

67 return AVERROR_EOF;

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

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

70 return AVERROR_INVALIDDATA;

71 }

73 switch (id) {

74 case TXD_INFO:

75 if (chunk_size > 100)

76 break;

77 case TXD_EXTRA:

78 avio_skip(s->pb, chunk_size);

79 case TXD_FILE:

80 case TXD_TEXTURE:

81 goto next_chunk;

82 default:

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

84 return AVERROR_INVALIDDATA;

85 }

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

88 if (ret < 0)

89 return ret;

90 pkt->stream_index = 0;

92 return 0;

93 }

95 AVInputFormat ff_txd_demuxer = {

96 .name = "txd",

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

98 .read_probe = txd_probe,

99 .read_header = txd_read_header,

100 .read_packet = txd_read_packet,

101 };

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