| /* |
| * AFC demuxer |
| * Copyright (c) 2012 Paul B Mahol |
| * |
| * 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 "avformat.h" |
| #include "internal.h" |
| |
| typedef struct AFCDemuxContext { |
| int64_t data_end; |
| } AFCDemuxContext; |
| |
| static int afc_read_header(AVFormatContext *s) |
| { |
| AFCDemuxContext *c = s->priv_data; |
| AVStream *st; |
| int ret; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AFC; |
| st->codecpar->channels = 2; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
| |
| if ((ret = ff_alloc_extradata(st->codecpar, 1)) < 0) |
| return ret; |
| st->codecpar->extradata[0] = 8 * st->codecpar->channels; |
| |
| c->data_end = avio_rb32(s->pb) + 32LL; |
| st->duration = avio_rb32(s->pb); |
| st->codecpar->sample_rate = avio_rb16(s->pb); |
| avio_skip(s->pb, 22); |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| static int afc_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AFCDemuxContext *c = s->priv_data; |
| int64_t size; |
| int ret; |
| |
| size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128); |
| if (size <= 0) |
| return AVERROR_EOF; |
| |
| ret = av_get_packet(s->pb, pkt, size); |
| pkt->stream_index = 0; |
| return ret; |
| } |
| |
| AVInputFormat ff_afc_demuxer = { |
| .name = "afc", |
| .long_name = NULL_IF_CONFIG_SMALL("AFC"), |
| .priv_data_size = sizeof(AFCDemuxContext), |
| .read_header = afc_read_header, |
| .read_packet = afc_read_packet, |
| .extensions = "afc", |
| .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK, |
| }; |