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1 | /* | ||
2 | * QOA demuxer | ||
3 | * | ||
4 | * This file is part of FFmpeg. | ||
5 | * | ||
6 | * FFmpeg is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU Lesser General Public | ||
8 | * License as published by the Free Software Foundation; either | ||
9 | * version 2.1 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * FFmpeg is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
14 | * Lesser General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU Lesser General Public | ||
17 | * License along with FFmpeg; if not, write to the Free Software | ||
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
19 | */ | ||
20 | |||
21 | #include "avformat.h" | ||
22 | #include "avio_internal.h" | ||
23 | #include "demux.h" | ||
24 | #include "internal.h" | ||
25 | #include "libavutil/intreadwrite.h" | ||
26 | |||
27 | 7128 | static int qoa_probe(const AVProbeData *p) | |
28 | { | ||
29 |
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7128 | if ((p->buf_size < 16) || |
30 |
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7128 | (AV_RB32(p->buf) != MKBETAG('q','o','a','f')) || |
31 |
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3 | (AV_RB32(p->buf + 4) == 0) || |
32 |
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3 | (p->buf[8] == 0) || |
33 |
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3 | (AV_RB24(p->buf + 9) == 0) || |
34 |
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3 | (AV_RB16(p->buf + 12) == 0) || |
35 |
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3 | (AV_RB16(p->buf + 14) == 0)) |
36 | 7125 | return 0; | |
37 | 3 | return AVPROBE_SCORE_MAX; | |
38 | } | ||
39 | |||
40 | 3 | static int qoa_read_header(AVFormatContext *s) | |
41 | { | ||
42 | 3 | AVIOContext *pb = s->pb; | |
43 | AVStream *st; | ||
44 | |||
45 | 3 | st = avformat_new_stream(s, NULL); | |
46 |
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3 | if (!st) |
47 | ✗ | return AVERROR(ENOMEM); | |
48 | |||
49 | 3 | avio_skip(pb, 4); | |
50 | 3 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
51 | 3 | st->codecpar->codec_id = AV_CODEC_ID_QOA; | |
52 | 3 | st->duration = avio_rb32(pb); | |
53 | 3 | st->start_time = 0; | |
54 | |||
55 | 3 | ffio_ensure_seekback(pb, 4); | |
56 | 3 | st->codecpar->ch_layout.nb_channels = avio_r8(pb); | |
57 |
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3 | if (st->codecpar->ch_layout.nb_channels == 0) |
58 | ✗ | return AVERROR_INVALIDDATA; | |
59 | |||
60 | 3 | st->codecpar->sample_rate = avio_rb24(pb); | |
61 |
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3 | if (st->codecpar->sample_rate == 0) |
62 | ✗ | return AVERROR_INVALIDDATA; | |
63 | |||
64 | 3 | avio_seek(pb, -4, SEEK_CUR); | |
65 | |||
66 | 3 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
67 | |||
68 | 3 | return 0; | |
69 | } | ||
70 | |||
71 | 173 | static int qoa_read_packet(AVFormatContext *s, AVPacket *pkt) | |
72 | { | ||
73 | 173 | AVIOContext *pb = s->pb; | |
74 | uint16_t size, duration; | ||
75 | uint8_t hdr[8]; | ||
76 | int64_t pos; | ||
77 | int ret; | ||
78 | |||
79 |
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173 | if (avio_feof(pb)) |
80 | 2 | return AVERROR_EOF; | |
81 | |||
82 | 171 | pos = avio_tell(pb); | |
83 | 171 | ret = avio_read(pb, hdr, sizeof(hdr)); | |
84 |
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171 | if (ret != sizeof(hdr)) |
85 | 3 | return AVERROR_EOF; | |
86 | |||
87 | 168 | duration = AV_RB16(hdr + 4); | |
88 | 168 | size = AV_RB16(hdr + 6); | |
89 |
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168 | if ((ret = av_new_packet(pkt, size)) < 0) |
90 | ✗ | return ret; | |
91 | |||
92 | 168 | memcpy(pkt->data, hdr, sizeof(hdr)); | |
93 | 168 | ret = avio_read(pb, pkt->data + sizeof(hdr), size - sizeof(hdr)); | |
94 |
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168 | if (ret != size - sizeof(hdr)) |
95 | ✗ | return AVERROR(EIO); | |
96 | 168 | pkt->stream_index = 0; | |
97 | 168 | pkt->pos = pos; | |
98 | 168 | pkt->duration = duration; | |
99 | |||
100 | 168 | return 0; | |
101 | } | ||
102 | |||
103 | const FFInputFormat ff_qoa_demuxer = { | ||
104 | .p.name = "qoa", | ||
105 | .p.long_name = NULL_IF_CONFIG_SMALL("QOA"), | ||
106 | .p.flags = AVFMT_GENERIC_INDEX, | ||
107 | .p.extensions = "qoa", | ||
108 | .read_probe = qoa_probe, | ||
109 | .read_header = qoa_read_header, | ||
110 | .read_packet = qoa_read_packet, | ||
111 | }; | ||
112 |