| 1 | /* |
| 2 | * AFC demuxer |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 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 "avformat.h" |
| 24 | #include "internal.h" |
| 25 | |
| 26 | typedef struct AFCDemuxContext { |
| 27 | int64_t data_end; |
| 28 | } AFCDemuxContext; |
| 29 | |
| 30 | static int afc_read_header(AVFormatContext *s) |
| 31 | { |
| 32 | AFCDemuxContext *c = s->priv_data; |
| 33 | AVStream *st; |
| 34 | |
| 35 | st = avformat_new_stream(s, NULL); |
| 36 | if (!st) |
| 37 | return AVERROR(ENOMEM); |
| 38 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 39 | st->codec->codec_id = AV_CODEC_ID_ADPCM_AFC; |
| 40 | st->codec->channels = 2; |
| 41 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| 42 | |
| 43 | if (ff_alloc_extradata(st->codec, 1)) |
| 44 | return AVERROR(ENOMEM); |
| 45 | st->codec->extradata[0] = 8 * st->codec->channels; |
| 46 | |
| 47 | c->data_end = avio_rb32(s->pb) + 32LL; |
| 48 | st->duration = avio_rb32(s->pb); |
| 49 | st->codec->sample_rate = avio_rb16(s->pb); |
| 50 | avio_skip(s->pb, 22); |
| 51 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int afc_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 57 | { |
| 58 | AFCDemuxContext *c = s->priv_data; |
| 59 | int64_t size; |
| 60 | int ret; |
| 61 | |
| 62 | size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128); |
| 63 | if (size <= 0) |
| 64 | return AVERROR_EOF; |
| 65 | |
| 66 | ret = av_get_packet(s->pb, pkt, size); |
| 67 | pkt->stream_index = 0; |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | AVInputFormat ff_afc_demuxer = { |
| 72 | .name = "afc", |
| 73 | .long_name = NULL_IF_CONFIG_SMALL("AFC"), |
| 74 | .priv_data_size = sizeof(AFCDemuxContext), |
| 75 | .read_header = afc_read_header, |
| 76 | .read_packet = afc_read_packet, |
| 77 | .extensions = "afc", |
| 78 | .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK, |
| 79 | }; |