FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/oggparseopus.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 83 97 85.6%
Functions: 3 3 100.0%
Branches: 41 60 68.3%
Line Branch Exec Source
1 /*
2 * Opus parser for Ogg
3 * Copyright (c) 2012 Nicolas George
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/intreadwrite.h"
25 #include "libavutil/mem.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "oggdec.h"
29
30 struct oggopus_private {
31 int need_comments;
32 unsigned pre_skip;
33 int64_t cur_dts;
34 };
35
36 #define OPUS_SEEK_PREROLL_MS 80
37 #define OPUS_HEAD_SIZE 19
38
39 12 static int opus_header(AVFormatContext *avf, int idx)
40 {
41 12 struct ogg *ogg = avf->priv_data;
42 12 struct ogg_stream *os = &ogg->streams[idx];
43 12 AVStream *st = avf->streams[idx];
44 12 struct oggopus_private *priv = os->private;
45 12 uint8_t *packet = os->buf + os->pstart;
46 int ret;
47
48
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 12 if (!priv) {
49 4 priv = os->private = av_mallocz(sizeof(*priv));
50
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 4 if (!priv)
51 ✗ return AVERROR(ENOMEM);
52 }
53
54
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 12 if (os->flags & OGG_FLAG_BOS) {
55
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 4 if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0)
56 ✗ return AVERROR_INVALIDDATA;
57 4 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
58 4 st->codecpar->codec_id = AV_CODEC_ID_OPUS;
59 4 st->codecpar->ch_layout.nb_channels = AV_RL8(packet + 9);
60
61 4 priv->pre_skip = AV_RL16(packet + 10);
62 4 st->codecpar->initial_padding = priv->pre_skip;
63 4 os->start_trimming = priv->pre_skip;
64 /*orig_sample_rate = AV_RL32(packet + 12);*/
65 /*gain = AV_RL16(packet + 16);*/
66 /*channel_map = AV_RL8 (packet + 18);*/
67
68
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 4 if ((ret = ff_alloc_extradata(st->codecpar, os->psize)) < 0)
69 ✗ return ret;
70
71 4 memcpy(st->codecpar->extradata, packet, os->psize);
72
73 4 st->codecpar->sample_rate = 48000;
74 4 st->codecpar->seek_preroll = av_rescale(OPUS_SEEK_PREROLL_MS,
75 4 st->codecpar->sample_rate, 1000);
76 4 avpriv_set_pts_info(st, 64, 1, 48000);
77 4 priv->need_comments = 1;
78 4 return 1;
79 }
80
81
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 8 if (priv->need_comments) {
82
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 4 if (os->psize < 8 || memcmp(packet, "OpusTags", 8))
83 ✗ return AVERROR_INVALIDDATA;
84 4 ff_vorbis_stream_comment(avf, st, packet + 8, os->psize - 8);
85 4 priv->need_comments--;
86 4 return 1;
87 }
88
89 4 return 0;
90 }
91
92 5386 static int opus_duration(uint8_t *src, int size)
93 {
94 5386 unsigned nb_frames = 1;
95 5386 unsigned toc = src[0];
96 5386 unsigned toc_config = toc >> 3;
97 5386 unsigned toc_count = toc & 3;
98
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 5470 unsigned frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) :
99
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 84 toc_config < 16 ? 480 << (toc_config & 1) :
100 84 120 << (toc_config & 3);
101
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 5386 if (toc_count == 3) {
102 ✗ if (size<2)
103 ✗ return AVERROR_INVALIDDATA;
104 ✗ nb_frames = src[1] & 0x3F;
105
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 5386 } else if (toc_count) {
106 ✗ nb_frames = 2;
107 }
108
109 5386 return frame_size * nb_frames;
110 }
111
112 286 static int opus_packet(AVFormatContext *avf, int idx)
113 {
114 286 struct ogg *ogg = avf->priv_data;
115 286 struct ogg_stream *os = &ogg->streams[idx];
116 286 AVStream *st = avf->streams[idx];
117 286 struct oggopus_private *priv = os->private;
118 286 uint8_t *packet = os->buf + os->pstart;
119 int ret;
120
121
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 286 if (!os->psize)
122 ✗ return AVERROR_INVALIDDATA;
123
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 286 if (os->granule > (1LL << 62)) {
124 ✗ av_log(avf, AV_LOG_ERROR, "Unsupported huge granule pos %"PRId64 "\n", os->granule);
125 ✗ return AVERROR_INVALIDDATA;
126 }
127
128
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 286 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
129 int seg, d;
130 int duration;
131 200 uint8_t *last_pkt = os->buf + os->pstart;
132 200 uint8_t *next_pkt = last_pkt;
133
134 200 duration = 0;
135 200 seg = os->segp;
136 200 d = opus_duration(last_pkt, os->psize);
137
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 200 if (d < 0) {
138 ✗ os->pflags |= AV_PKT_FLAG_CORRUPT;
139 ✗ return 0;
140 }
141 200 duration += d;
142 200 last_pkt = next_pkt = next_pkt + os->psize;
143
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 5100 for (; seg < os->nsegs; seg++) {
144 4900 next_pkt += os->segments[seg];
145
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 4900 if (os->segments[seg] < 255 && next_pkt != last_pkt) {
146 4900 int d = opus_duration(last_pkt, next_pkt - last_pkt);
147
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 4900 if (d > 0)
148 4900 duration += d;
149 4900 last_pkt = next_pkt;
150 }
151 }
152 200 os->lastpts =
153 200 os->lastdts = os->granule - duration;
154 }
155
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 286 if ((ret = opus_duration(packet, os->psize)) < 0)
157 ✗ return ret;
158
159 286 os->pduration = ret;
160
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 286 if (os->lastpts != AV_NOPTS_VALUE) {
161
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 206 if (st->start_time == AV_NOPTS_VALUE)
162 4 st->start_time = os->lastpts;
163 206 priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip;
164 }
165
166 286 priv->cur_dts += os->pduration;
167
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 286 if ((os->flags & OGG_FLAG_EOS)) {
168 84 int64_t skip = priv->cur_dts - os->granule + priv->pre_skip;
169 84 skip = FFMIN(skip, os->pduration);
170
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 84 if (skip > 0) {
171
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 2 os->pduration = skip < os->pduration ? os->pduration - skip : 1;
172 2 os->end_trimming = skip;
173 2 av_log(avf, AV_LOG_DEBUG,
174 "Last packet was truncated to %d due to end trimming.\n",
175 os->pduration);
176 }
177 }
178
179 286 return 0;
180 }
181
182 const struct ogg_codec ff_opus_codec = {
183 .name = "Opus",
184 .magic = "OpusHead",
185 .magicsize = 8,
186 .header = opus_header,
187 .packet = opus_packet,
188 .nb_header = 1,
189 };
190