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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * AFC demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/channel_layout.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "internal.h" |
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| 25 | |||
| 26 | typedef struct AFCDemuxContext { |
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| 27 | int64_t data_end; |
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| 28 | } AFCDemuxContext; |
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| 29 | |||
| 30 | static int afc_read_header(AVFormatContext *s) |
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| 31 | { |
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| 32 | AFCDemuxContext *c = s->priv_data; |
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| 33 | AVStream *st; |
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| 34 | |||
| 35 | st = avformat_new_stream(s, NULL); |
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| 36 | if (!st) |
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| 37 | return AVERROR(ENOMEM); |
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| 38 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 39 | st->codec->codec_id = AV_CODEC_ID_ADPCM_AFC; |
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| 40 | st->codec->channels = 2; |
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| 41 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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| 42 | |||
| 43 | if (ff_alloc_extradata(st->codec, 1)) |
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| 44 | return AVERROR(ENOMEM); |
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| 45 | st->codec->extradata[0] = 8 * st->codec->channels; |
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| 46 | |||
| 47 | c->data_end = avio_rb32(s->pb) + 32LL; |
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| 48 | st->duration = avio_rb32(s->pb); |
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| 49 | st->codec->sample_rate = avio_rb16(s->pb); |
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| 50 | avio_skip(s->pb, 22); |
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| 51 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 52 | |||
| 53 | return 0; |
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| 54 | } |
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| 55 | |||
| 56 | static int afc_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 57 | { |
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| 58 | AFCDemuxContext *c = s->priv_data; |
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| 59 | int64_t size; |
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| 60 | int ret; |
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| 61 | |||
| 62 | size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128); |
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| 63 | if (size <= 0) |
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| 64 | return AVERROR_EOF; |
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| 65 | |||
| 66 | ret = av_get_packet(s->pb, pkt, size); |
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| 67 | pkt->stream_index = 0; |
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| 68 | return ret; |
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| 69 | } |
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| 70 | |||
| 71 | AVInputFormat ff_afc_demuxer = { |
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| 72 | .name = "afc", |
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| 73 | .long_name = NULL_IF_CONFIG_SMALL("AFC"), |
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| 74 | .priv_data_size = sizeof(AFCDemuxContext), |
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| 75 | .read_header = afc_read_header, |
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| 76 | .read_packet = afc_read_packet, |
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| 77 | .extensions = "afc", |
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| 78 | .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK, |
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| 79 | }; |