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2ba45a60 DM |
1 | /* |
2 | * ADP demuxer | |
3 | * Copyright (c) 2013 James Almer | |
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 | */ | |
21 | ||
22 | #include "libavutil/channel_layout.h" | |
23 | #include "libavutil/intreadwrite.h" | |
24 | #include "avformat.h" | |
25 | #include "internal.h" | |
26 | ||
27 | static int adp_probe(AVProbeData *p) | |
28 | { | |
29 | int i, changes = 0; | |
30 | char last = 0; | |
31 | ||
32 | if (p->buf_size < 32) | |
33 | return 0; | |
34 | ||
35 | for (i = 0; i < p->buf_size - 3; i+=32) { | |
36 | if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3]) | |
37 | return 0; | |
38 | if (p->buf[i] != last) | |
39 | changes++; | |
40 | last = p->buf[i]; | |
41 | } | |
42 | if (changes <= 1) | |
43 | return 0; | |
44 | ||
45 | return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4; | |
46 | } | |
47 | ||
48 | static int adp_read_header(AVFormatContext *s) | |
49 | { | |
50 | AVStream *st; | |
51 | ||
52 | st = avformat_new_stream(s, NULL); | |
53 | if (!st) | |
54 | return AVERROR(ENOMEM); | |
55 | ||
56 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
57 | st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK; | |
58 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
59 | st->codec->channels = 2; | |
60 | st->codec->sample_rate = 48000; | |
61 | st->start_time = 0; | |
62 | if (s->pb->seekable) | |
63 | st->duration = av_get_audio_frame_duration(st->codec, avio_size(s->pb)); | |
64 | ||
65 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int adp_read_packet(AVFormatContext *s, AVPacket *pkt) | |
71 | { | |
72 | int ret, size = 1024; | |
73 | ||
74 | if (avio_feof(s->pb)) | |
75 | return AVERROR_EOF; | |
76 | ||
77 | ret = av_get_packet(s->pb, pkt, size); | |
78 | ||
79 | if (ret != size) { | |
80 | if (ret < 0) { | |
81 | av_free_packet(pkt); | |
82 | return ret; | |
83 | } | |
84 | av_shrink_packet(pkt, ret); | |
85 | } | |
86 | pkt->stream_index = 0; | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | AVInputFormat ff_adp_demuxer = { | |
92 | .name = "adp", | |
93 | .long_name = NULL_IF_CONFIG_SMALL("ADP"), | |
94 | .read_probe = adp_probe, | |
95 | .read_header = adp_read_header, | |
96 | .read_packet = adp_read_packet, | |
97 | .extensions = "adp,dtk", | |
98 | }; |