repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | }; |