| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * AVR 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/intreadwrite.h" | ||
| 23 | #include "avformat.h" | ||
| 24 | #include "demux.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "pcm.h" | ||
| 27 | |||
| 28 | 7186 | static int avr_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7186 | if (AV_RL32(p->buf) != MKTAG('2', 'B', 'I', 'T')) |
| 31 | 7186 | return 0; | |
| 32 | |||
| 33 | ✗ | if (!AV_RB16(p->buf+12) || AV_RB16(p->buf+12) > 256) // channels | |
| 34 | ✗ | return AVPROBE_SCORE_EXTENSION/2; | |
| 35 | ✗ | if (AV_RB16(p->buf+14) > 256) // bps | |
| 36 | ✗ | return AVPROBE_SCORE_EXTENSION/2; | |
| 37 | |||
| 38 | ✗ | return AVPROBE_SCORE_EXTENSION; | |
| 39 | } | ||
| 40 | |||
| 41 | ✗ | static int avr_read_header(AVFormatContext *s) | |
| 42 | { | ||
| 43 | uint16_t chan, sign, bps; | ||
| 44 | AVStream *st; | ||
| 45 | |||
| 46 | ✗ | st = avformat_new_stream(s, NULL); | |
| 47 | ✗ | if (!st) | |
| 48 | ✗ | return AVERROR(ENOMEM); | |
| 49 | |||
| 50 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 51 | |||
| 52 | ✗ | avio_skip(s->pb, 4 /* magic */ + 8 /* sample_name */); | |
| 53 | |||
| 54 | ✗ | chan = avio_rb16(s->pb); | |
| 55 | ✗ | if (!chan) { | |
| 56 | ✗ | st->codecpar->ch_layout.nb_channels = 1; | |
| 57 | ✗ | } else if (chan == 0xFFFFu) { | |
| 58 | ✗ | st->codecpar->ch_layout.nb_channels = 2; | |
| 59 | } else { | ||
| 60 | ✗ | avpriv_request_sample(s, "chan %d", chan); | |
| 61 | ✗ | return AVERROR_PATCHWELCOME; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | st->codecpar->bits_per_coded_sample = bps = avio_rb16(s->pb); | |
| 65 | |||
| 66 | ✗ | sign = avio_rb16(s->pb); | |
| 67 | |||
| 68 | ✗ | avio_skip(s->pb, 2 /* loop */ + 2 /* midi */ + 1 /* replay speed */); | |
| 69 | |||
| 70 | ✗ | st->codecpar->sample_rate = avio_rb24(s->pb); | |
| 71 | ✗ | if (st->codecpar->sample_rate == 0) | |
| 72 | ✗ | return AVERROR_INVALIDDATA; | |
| 73 | |||
| 74 | ✗ | avio_skip(s->pb, 4 * 3 + 2 * 3 + 20 + 64); | |
| 75 | |||
| 76 | ✗ | st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign); | |
| 77 | ✗ | if (st->codecpar->codec_id == AV_CODEC_ID_NONE) { | |
| 78 | ✗ | avpriv_request_sample(s, "Bps %d and sign %d", bps, sign); | |
| 79 | ✗ | return AVERROR_PATCHWELCOME; | |
| 80 | } | ||
| 81 | |||
| 82 | ✗ | st->codecpar->block_align = bps * st->codecpar->ch_layout.nb_channels / 8; | |
| 83 | |||
| 84 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 85 | ✗ | return 0; | |
| 86 | } | ||
| 87 | |||
| 88 | const FFInputFormat ff_avr_demuxer = { | ||
| 89 | .p.name = "avr", | ||
| 90 | .p.long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"), | ||
| 91 | .p.extensions = "avr", | ||
| 92 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 93 | .read_probe = avr_probe, | ||
| 94 | .read_header = avr_read_header, | ||
| 95 | .read_packet = ff_pcm_read_packet, | ||
| 96 | .read_seek = ff_pcm_read_seek, | ||
| 97 | }; | ||
| 98 |