| /* |
| * ADP demuxer |
| * Copyright (c) 2013 James Almer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| static int adp_probe(AVProbeData *p) |
| { |
| int i, changes = 0; |
| char last = 0; |
| |
| if (p->buf_size < 32) |
| return 0; |
| |
| for (i = 0; i < p->buf_size - 3; i+=32) { |
| if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3]) |
| return 0; |
| if (p->buf[i] != last) |
| changes++; |
| last = p->buf[i]; |
| } |
| if (changes <= 1) |
| return 0; |
| |
| return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4; |
| } |
| |
| static int adp_read_header(AVFormatContext *s) |
| { |
| AVStream *st; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK; |
| st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| st->codec->channels = 2; |
| st->codec->sample_rate = 48000; |
| st->start_time = 0; |
| if (s->pb->seekable) |
| st->duration = av_get_audio_frame_duration(st->codec, avio_size(s->pb)); |
| |
| avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| |
| return 0; |
| } |
| |
| static int adp_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| int ret, size = 1024; |
| |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| |
| ret = av_get_packet(s->pb, pkt, size); |
| |
| if (ret != size) { |
| if (ret < 0) { |
| av_packet_unref(pkt); |
| return ret; |
| } |
| av_shrink_packet(pkt, ret); |
| } |
| pkt->stream_index = 0; |
| |
| return ret; |
| } |
| |
| AVInputFormat ff_adp_demuxer = { |
| .name = "adp", |
| .long_name = NULL_IF_CONFIG_SMALL("ADP"), |
| .read_probe = adp_probe, |
| .read_header = adp_read_header, |
| .read_packet = adp_read_packet, |
| .extensions = "adp,dtk", |
| }; |