repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 | }; |