| 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 | }; |