FFmpeg: libavformat/adp.c Source File

FFmpeg

[フレーム]

libavformat

adp.c

Go to the documentation of this file.

1 /*

2 * ADP 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/channel_layout.h"

23 #include "libavutil/intreadwrite.h"

24 #include "avformat.h"

25 #include "internal.h"

27 static int adp_probe(AVProbeData *p)

28 {

29 int i;

31 if (p->buf_size < 32)

32 return 0;

34 for (i = 0; i < p->buf_size - 3; i+=32)

35 if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])

36 return 0;

38 return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;

39 }

41 static int adp_read_header(AVFormatContext *s)

42 {

43 AVStream *st;

45 st = avformat_new_stream(s, NULL);

46 if (!st)

47 return AVERROR(ENOMEM);

49 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

50 st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK;

51 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

52 st->codec->channels = 2;

53 st->codec->sample_rate = 48000;

54 st->start_time = 0;

55 if (s->pb->seekable)

56 st->duration = av_get_audio_frame_duration(st->codec, avio_size(s->pb));

58 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

60 return 0;

61 }

63 static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)

64 {

65 int ret, size = 1024;

67 if (url_feof(s->pb))

68 return AVERROR_EOF;

70 ret = av_get_packet(s->pb, pkt, size);

72 if (ret != size) {

73 if (ret < 0) {

74 av_free_packet(pkt);

75 return ret;

76 }

77 av_shrink_packet(pkt, ret);

78 }

79 pkt->stream_index = 0;

81 return ret;

82 }

84 AVInputFormat ff_adp_demuxer = {

85 .name = "adp",

86 .long_name = NULL_IF_CONFIG_SMALL("ADP"),

87 .read_probe = adp_probe,

88 .read_header = adp_read_header,

89 .read_packet = adp_read_packet,

90 .extensions = "adp,dtk",

91 };

Generated on Wed Jul 10 2013 23:48:11 for FFmpeg by doxygen 1.8.2