FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dsfdec.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 3 109 2.8%
Branches: 2 61 3.3%

Line Branch Exec Source
1 /*
2 * DSD Stream File (DSF) demuxer
3 * Copyright (c) 2014 Peter Ross
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/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "id3v2.h"
27
28 typedef struct {
29 uint64_t data_end;
30 uint64_t audio_size;
31 uint64_t data_size;
32 } DSFContext;
33
34 6780 static int dsf_probe(const AVProbeData *p)
35 {
36
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6780 if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
37 6780 return 0;
38 return AVPROBE_SCORE_MAX;
39 }
40
41 static const AVChannelLayout dsf_channel_layout[] = {
42 { .order = AV_CHANNEL_ORDER_UNSPEC },
43 AV_CHANNEL_LAYOUT_MONO,
44 AV_CHANNEL_LAYOUT_STEREO,
45 AV_CHANNEL_LAYOUT_SURROUND,
46 AV_CHANNEL_LAYOUT_QUAD,
47 AV_CHANNEL_LAYOUT_4POINT0,
48 AV_CHANNEL_LAYOUT_5POINT0_BACK,
49 AV_CHANNEL_LAYOUT_5POINT1_BACK,
50 };
51
52 static void read_id3(AVFormatContext *s, uint64_t id3pos)
53 {
54 ID3v2ExtraMeta *id3v2_extra_meta;
55 if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
56 return;
57
58 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
59 if (id3v2_extra_meta) {
60 ff_id3v2_parse_apic(s, id3v2_extra_meta);
61 ff_id3v2_parse_chapters(s, id3v2_extra_meta);
62 }
63 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
64 }
65
66 static int dsf_read_header(AVFormatContext *s)
67 {
68 DSFContext *dsf = s->priv_data;
69 AVIOContext *pb = s->pb;
70 AVStream *st;
71 uint64_t id3pos;
72 unsigned int channel_type;
73 int channels;
74
75 avio_skip(pb, 4);
76 if (avio_rl64(pb) != 28)
77 return AVERROR_INVALIDDATA;
78
79 /* create primary stream before any id3 coverart streams */
80 st = avformat_new_stream(s, NULL);
81 if (!st)
82 return AVERROR(ENOMEM);
83
84 avio_skip(pb, 8);
85 id3pos = avio_rl64(pb);
86 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
87 read_id3(s, id3pos);
88 avio_seek(pb, 28, SEEK_SET);
89 }
90
91 /* fmt chunk */
92
93 if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
94 return AVERROR_INVALIDDATA;
95
96 if (avio_rl32(pb) != 1) {
97 avpriv_request_sample(s, "unknown format version");
98 return AVERROR_INVALIDDATA;
99 }
100
101 if (avio_rl32(pb)) {
102 avpriv_request_sample(s, "unknown format id");
103 return AVERROR_INVALIDDATA;
104 }
105
106 channel_type = avio_rl32(pb);
107 if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
108 st->codecpar->ch_layout = dsf_channel_layout[channel_type];
109 if (!st->codecpar->ch_layout.nb_channels)
110 avpriv_request_sample(s, "channel type %i", channel_type);
111
112 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
113 channels = avio_rl32(pb);
114 if (!st->codecpar->ch_layout.nb_channels) {
115 st->codecpar->ch_layout.nb_channels = channels;
116 } else if (channels != st->codecpar->ch_layout.nb_channels) {
117 av_log(s, AV_LOG_ERROR, "Channel count mismatch\n");
118 return AVERROR(EINVAL);
119 }
120 st->codecpar->sample_rate = avio_rl32(pb) / 8;
121
122 if (st->codecpar->ch_layout.nb_channels <= 0)
123 return AVERROR_INVALIDDATA;
124
125 switch(avio_rl32(pb)) {
126 case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
127 case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
128 default:
129 avpriv_request_sample(s, "unknown most significant bit");
130 return AVERROR_INVALIDDATA;
131 }
132
133 dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->ch_layout.nb_channels;
134 st->codecpar->block_align = avio_rl32(pb);
135 if (st->codecpar->block_align > INT_MAX / st->codecpar->ch_layout.nb_channels ||
136 st->codecpar->block_align <= 0) {
137 avpriv_request_sample(s, "block_align invalid");
138 return AVERROR_INVALIDDATA;
139 }
140 st->codecpar->block_align *= st->codecpar->ch_layout.nb_channels;
141 st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * 8LL * st->codecpar->sample_rate;
142 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
143 avio_skip(pb, 4);
144
145 /* data chunk */
146
147 dsf->data_end = avio_tell(pb);
148 if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
149 return AVERROR_INVALIDDATA;
150 dsf->data_size = avio_rl64(pb) - 12;
151 dsf->data_end += dsf->data_size + 12;
152
153 return 0;
154 }
155
156 static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
157 {
158 FFFormatContext *const si = ffformatcontext(s);
159 DSFContext *dsf = s->priv_data;
160 AVIOContext *pb = s->pb;
161 AVStream *st = s->streams[0];
162 int64_t pos = avio_tell(pb);
163 int channels = st->codecpar->ch_layout.nb_channels;
164 int ret;
165
166 if (pos >= dsf->data_end)
167 return AVERROR_EOF;
168
169 if (dsf->data_size > dsf->audio_size) {
170 int last_packet = pos == (dsf->data_end - st->codecpar->block_align);
171
172 if (last_packet) {
173 int64_t data_pos = pos - si->data_offset;
174 int64_t packet_size = dsf->audio_size - data_pos;
175 int64_t skip_size = dsf->data_size - data_pos - packet_size;
176 uint8_t *dst;
177 int ch, ret;
178
179 if (packet_size <= 0 || skip_size <= 0)
180 return AVERROR_INVALIDDATA;
181
182 if ((ret = av_new_packet(pkt, packet_size)) < 0)
183 return ret;
184 dst = pkt->data;
185 for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
186 ret = avio_read(pb, dst, packet_size / st->codecpar->ch_layout.nb_channels);
187 if (ret < packet_size / st->codecpar->ch_layout.nb_channels)
188 return AVERROR_EOF;
189
190 dst += ret;
191 avio_skip(pb, skip_size / st->codecpar->ch_layout.nb_channels);
192 }
193
194 pkt->pos = pos;
195 pkt->stream_index = 0;
196 pkt->pts = (pos - si->data_offset) / channels;
197 pkt->duration = packet_size / channels;
198 return 0;
199 }
200 }
201 ret = av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
202 if (ret < 0)
203 return ret;
204
205 pkt->stream_index = 0;
206 pkt->pts = (pos - si->data_offset) / channels;
207 pkt->duration = st->codecpar->block_align / channels;
208
209 return 0;
210 }
211
212 const AVInputFormat ff_dsf_demuxer = {
213 .name = "dsf",
214 .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
215 .priv_data_size = sizeof(DSFContext),
216 .read_probe = dsf_probe,
217 .read_header = dsf_read_header,
218 .read_packet = dsf_read_packet,
219 .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
220 };
221