FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/xa.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 46 52 88.5%
Functions: 3 3 100.0%
Branches: 14 26 53.8%
Line Branch Exec Source
1 /*
2 * Maxis XA (.xa) File Demuxer
3 * Copyright (c) 2008 Robert Marston
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 /**
23 * @file
24 * Maxis XA File Demuxer
25 * by Robert Marston (rmarston@gmail.com)
26 * for more information on the XA audio format see
27 * http://wiki.multimedia.cx/index.php?title=Maxis_XA
28 */
29
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32 #include "demux.h"
33 #include "internal.h"
34
35 #define XA00_TAG MKTAG('X', 'A', 0, 0)
36 #define XAI0_TAG MKTAG('X', 'A', 'I', 0)
37 #define XAJ0_TAG MKTAG('X', 'A', 'J', 0)
38
39 typedef struct MaxisXADemuxContext {
40 uint32_t out_size;
41 uint32_t sent_bytes;
42 } MaxisXADemuxContext;
43
44 7186 static int xa_probe(const AVProbeData *p)
45 {
46 int channels, srate, bits_per_sample;
47
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 7186 if (p->buf_size < 24)
48 ✗ return 0;
49
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 7186 switch(AV_RL32(p->buf)) {
50 2 case XA00_TAG:
51 case XAI0_TAG:
52 case XAJ0_TAG:
53 2 break;
54 7184 default:
55 7184 return 0;
56 }
57 2 channels = AV_RL16(p->buf + 10);
58 2 srate = AV_RL32(p->buf + 12);
59 2 bits_per_sample = AV_RL16(p->buf + 22);
60
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 2 if (!channels || channels > 8 || !srate || srate > 192000 ||
61
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 2 bits_per_sample < 4 || bits_per_sample > 32)
62 ✗ return 0;
63 2 return AVPROBE_SCORE_EXTENSION;
64 }
65
66 2 static int xa_read_header(AVFormatContext *s)
67 {
68 2 MaxisXADemuxContext *xa = s->priv_data;
69 2 AVIOContext *pb = s->pb;
70 AVStream *st;
71
72 /*Set up the XA Audio Decoder*/
73 2 st = avformat_new_stream(s, NULL);
74
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 2 if (!st)
75 ✗ return AVERROR(ENOMEM);
76
77 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
78 2 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_EA_MAXIS_XA;
79 2 avio_skip(pb, 4); /* Skip the XA ID */
80 2 xa->out_size = avio_rl32(pb);
81 2 avio_skip(pb, 2); /* Skip the tag */
82 2 st->codecpar->ch_layout.nb_channels = avio_rl16(pb);
83 2 st->codecpar->sample_rate = avio_rl32(pb);
84 2 avio_skip(pb, 4); /* Skip average byte rate */
85 2 avio_skip(pb, 2); /* Skip block align */
86 2 avio_skip(pb, 2); /* Skip bits-per-sample */
87
88
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 2 if (!st->codecpar->ch_layout.nb_channels || !st->codecpar->sample_rate)
89 ✗ return AVERROR_INVALIDDATA;
90
91 2 st->codecpar->bit_rate = av_clip(15LL * st->codecpar->ch_layout.nb_channels * 8 *
92 2 st->codecpar->sample_rate / 28, 0, INT_MAX);
93
94 2 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
95 2 st->start_time = 0;
96
97 2 return 0;
98 }
99
100 100 static int xa_read_packet(AVFormatContext *s,
101 AVPacket *pkt)
102 {
103 100 MaxisXADemuxContext *xa = s->priv_data;
104 100 AVStream *st = s->streams[0];
105 100 AVIOContext *pb = s->pb;
106 unsigned int packet_size;
107 int ret;
108
109
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 100 if (xa->sent_bytes >= xa->out_size)
110 ✗ return AVERROR_EOF;
111 /* 1 byte header and 14 bytes worth of samples * number channels per block */
112 100 packet_size = 15*st->codecpar->ch_layout.nb_channels;
113
114 100 ret = av_get_packet(pb, pkt, packet_size);
115
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 100 if(ret < 0)
116 ✗ return ret;
117
118 100 pkt->stream_index = st->index;
119 100 xa->sent_bytes += packet_size;
120 100 pkt->duration = 28;
121
122 100 return ret;
123 }
124
125 const FFInputFormat ff_xa_demuxer = {
126 .p.name = "xa",
127 .p.long_name = NULL_IF_CONFIG_SMALL("Maxis XA"),
128 .priv_data_size = sizeof(MaxisXADemuxContext),
129 .read_probe = xa_probe,
130 .read_header = xa_read_header,
131 .read_packet = xa_read_packet,
132 };
133