| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | |||
| 28 | 7186 | static int adp_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 | 7186 | int i, changes = 0; | |
| 31 | 7186 | uint8_t last = 0; | |
| 32 | |||
| 33 |
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7186 | if (p->buf_size < 32) |
| 34 | ✗ | return 0; | |
| 35 | |||
| 36 |
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5112101 | for (i = 0; i < p->buf_size - 3; i+=32) { |
| 37 |
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5111353 | if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3]) |
| 38 | 6438 | return 0; | |
| 39 |
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5104915 | if (p->buf[i] != last) |
| 40 | 5049653 | changes++; | |
| 41 | 5104915 | last = p->buf[i]; | |
| 42 | } | ||
| 43 |
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748 | if (changes <= 1) |
| 44 | ✗ | return 0; | |
| 45 | |||
| 46 |
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748 | return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4; |
| 47 | } | ||
| 48 | |||
| 49 | 1 | static int adp_read_header(AVFormatContext *s) | |
| 50 | { | ||
| 51 | AVStream *st; | ||
| 52 | |||
| 53 | 1 | st = avformat_new_stream(s, NULL); | |
| 54 |
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1 | if (!st) |
| 55 | ✗ | return AVERROR(ENOMEM); | |
| 56 | |||
| 57 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 58 | 1 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; | |
| 59 | 1 | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| 60 | 1 | st->codecpar->sample_rate = 48000; | |
| 61 | 1 | st->start_time = 0; | |
| 62 |
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1 | if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) |
| 63 | 1 | st->duration = av_get_audio_frame_duration2(st->codecpar, avio_size(s->pb)); | |
| 64 | |||
| 65 | 1 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 66 | |||
| 67 | 1 | return 0; | |
| 68 | } | ||
| 69 | |||
| 70 | 34 | static int adp_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 71 | { | ||
| 72 | 34 | int ret, size = 1024; | |
| 73 | |||
| 74 |
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34 | if (avio_feof(s->pb)) |
| 75 | 1 | return AVERROR_EOF; | |
| 76 | |||
| 77 | 33 | ret = av_get_packet(s->pb, pkt, size); | |
| 78 |
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33 | if (ret < 0) |
| 79 | 1 | return ret; | |
| 80 | |||
| 81 | 32 | pkt->stream_index = 0; | |
| 82 | |||
| 83 | 32 | return ret; | |
| 84 | } | ||
| 85 | |||
| 86 | const FFInputFormat ff_adp_demuxer = { | ||
| 87 | .p.name = "adp", | ||
| 88 | .p.long_name = NULL_IF_CONFIG_SMALL("ADP"), | ||
| 89 | .p.extensions = "adp,dtk", | ||
| 90 | .read_probe = adp_probe, | ||
| 91 | .read_header = adp_read_header, | ||
| 92 | .read_packet = adp_read_packet, | ||
| 93 | }; | ||
| 94 |