| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * CRYO APC audio format demuxer | ||
| 3 | * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> | ||
| 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 <string.h> | ||
| 23 | |||
| 24 | #include "libavutil/channel_layout.h" | ||
| 25 | #include "avformat.h" | ||
| 26 | #include "demux.h" | ||
| 27 | |||
| 28 | 7186 | static int apc_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7186 | if (!strncmp(p->buf, "CRYO_APC", 8)) |
| 31 | 1 | return AVPROBE_SCORE_MAX; | |
| 32 | |||
| 33 | 7185 | return 0; | |
| 34 | } | ||
| 35 | |||
| 36 | 1 | static int apc_read_header(AVFormatContext *s) | |
| 37 | { | ||
| 38 | 1 | AVIOContext *pb = s->pb; | |
| 39 | AVStream *st; | ||
| 40 | int ret; | ||
| 41 | int channels; | ||
| 42 | |||
| 43 | 1 | avio_rl32(pb); /* CRYO */ | |
| 44 | 1 | avio_rl32(pb); /* _APC */ | |
| 45 | 1 | avio_rl32(pb); /* 1.20 */ | |
| 46 | |||
| 47 | 1 | st = avformat_new_stream(s, NULL); | |
| 48 |
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1 | if (!st) |
| 49 | ✗ | return AVERROR(ENOMEM); | |
| 50 | |||
| 51 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 52 | 1 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APC; | |
| 53 | |||
| 54 | 1 | avio_rl32(pb); /* number of samples */ | |
| 55 | 1 | st->codecpar->sample_rate = avio_rl32(pb); | |
| 56 | |||
| 57 | /* initial predictor values for adpcm decoder */ | ||
| 58 |
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1 | if ((ret = ff_get_extradata(s, st->codecpar, pb, 2 * 4)) < 0) |
| 59 | ✗ | return ret; | |
| 60 | |||
| 61 |
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1 | channels = !!avio_rl32(pb) + 1; |
| 62 | 1 | av_channel_layout_default(&st->codecpar->ch_layout, channels); | |
| 63 | |||
| 64 | 1 | st->codecpar->bits_per_coded_sample = 4; | |
| 65 | 1 | st->codecpar->bit_rate = (int64_t)st->codecpar->bits_per_coded_sample * channels | |
| 66 | 1 | * st->codecpar->sample_rate; | |
| 67 | 1 | st->codecpar->block_align = 1; | |
| 68 | |||
| 69 | 1 | return 0; | |
| 70 | } | ||
| 71 | |||
| 72 | #define MAX_READ_SIZE 4096 | ||
| 73 | |||
| 74 | 180 | static int apc_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 75 | { | ||
| 76 |
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180 | if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0) |
| 77 | 1 | return AVERROR(EIO); | |
| 78 | 179 | pkt->stream_index = 0; | |
| 79 | 179 | return 0; | |
| 80 | } | ||
| 81 | |||
| 82 | const FFInputFormat ff_apc_demuxer = { | ||
| 83 | .p.name = "apc", | ||
| 84 | .p.long_name = NULL_IF_CONFIG_SMALL("CRYO APC"), | ||
| 85 | .read_probe = apc_probe, | ||
| 86 | .read_header = apc_read_header, | ||
| 87 | .read_packet = apc_read_packet, | ||
| 88 | }; | ||
| 89 |