FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/qcp.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 63 82 76.8%
Functions: 4 4 100.0%
Branches: 28 49 57.1%
Line Branch Exec Source
1 /*
2 * QCP format (.qcp) demuxer
3 * Copyright (c) 2009 Kenan Gillet
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 * QCP format (.qcp) demuxer
25 * @author Kenan Gillet
26 * @see RFC 3625: "The QCP File Format and Media Types for Speech Data"
27 * http://tools.ietf.org/html/rfc3625
28 */
29
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "demux.h"
34 #include "riff.h"
35
36 typedef struct QCPContext {
37 uint32_t data_size; ///< size of data chunk
38
39 #define QCP_MAX_MODE 4
40 int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
41 ///< to each mode, -1 if no size.
42 } QCPContext;
43
44 /**
45 * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
46 * the first byte of the GUID can be either 0x41 or 0x42.
47 */
48 static const uint8_t guid_qcelp_13k_part[15] = {
49 0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
50 0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
51 };
52
53 /**
54 * EVRC GUID as stored in the file
55 */
56 static const uint8_t guid_evrc[16] = {
57 0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
58 0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
59 };
60
61 static const uint8_t guid_4gv[16] = {
62 0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
63 0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
64 };
65
66 /**
67 * SMV GUID as stored in the file
68 */
69 static const uint8_t guid_smv[16] = {
70 0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
71 0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
72 };
73
74 /**
75 * @param guid contains at least 16 bytes
76 * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
77 */
78 2 static int is_qcelp_13k_guid(const uint8_t *guid) {
79 ✗ return (guid[0] == 0x41 || guid[0] == 0x42)
80
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 2 && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
81 }
82
83 7186 static int qcp_probe(const AVProbeData *pd)
84 {
85
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 7186 if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
86
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 960 AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
87 2 return AVPROBE_SCORE_MAX;
88 7184 return 0;
89 }
90
91 2 static int qcp_read_header(AVFormatContext *s)
92 {
93 2 AVIOContext *pb = s->pb;
94 2 QCPContext *c = s->priv_data;
95 2 AVStream *st = avformat_new_stream(s, NULL);
96 uint8_t buf[16];
97 int i;
98 unsigned nb_rates;
99
100
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 2 if (!st)
101 ✗ return AVERROR(ENOMEM);
102
103 2 avio_rb32(pb); // "RIFF"
104 2 avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
105
106 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
107 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
108 2 avio_read(pb, buf, 16);
109
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 2 if (is_qcelp_13k_guid(buf)) {
110 2 st->codecpar->codec_id = AV_CODEC_ID_QCELP;
111 ✗ } else if (!memcmp(buf, guid_evrc, 16)) {
112 ✗ st->codecpar->codec_id = AV_CODEC_ID_EVRC;
113 ✗ } else if (!memcmp(buf, guid_smv, 16)) {
114 ✗ st->codecpar->codec_id = AV_CODEC_ID_SMV;
115 ✗ } else if (!memcmp(buf, guid_4gv, 16)) {
116 ✗ st->codecpar->codec_id = AV_CODEC_ID_4GV;
117 } else {
118 ✗ av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
119 ✗ FF_ARG_GUID(buf));
120 ✗ return AVERROR_INVALIDDATA;
121 }
122 2 avio_skip(pb, 2 + 80); // codec-version + codec-name
123 2 st->codecpar->bit_rate = avio_rl16(pb);
124
125 2 s->packet_size = avio_rl16(pb);
126 2 avio_skip(pb, 2); // block-size
127 2 st->codecpar->sample_rate = avio_rl16(pb);
128 2 avio_skip(pb, 2); // sample-size
129
130 2 memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
131 2 nb_rates = avio_rl32(pb);
132 2 nb_rates = FFMIN(nb_rates, 8);
133
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 12 for (i=0; i<nb_rates; i++) {
134 10 int size = avio_r8(pb);
135 10 int mode = avio_r8(pb);
136
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 10 if (mode > QCP_MAX_MODE) {
137 ✗ av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
138 } else
139 10 c->rates_per_mode[mode] = size;
140 }
141 2 avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
142
143 2 return 0;
144 }
145
146 992 static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
147 {
148 992 AVIOContext *pb = s->pb;
149 992 QCPContext *c = s->priv_data;
150 unsigned int chunk_size, tag;
151
152
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 1002 while(!avio_feof(pb)) {
153
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 1000 if (c->data_size) {
154 990 int pkt_size, ret, mode = avio_r8(pb);
155
156
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 990 if (s->packet_size) {
157 ✗ pkt_size = s->packet_size - 1;
158
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 990 } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
159 ✗ c->data_size--;
160 ✗ continue;
161 }
162
163
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 990 if (c->data_size <= pkt_size) {
164 ✗ av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
165 ✗ pkt_size = c->data_size - 1;
166 }
167
168
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 990 if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
169
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 990 if (pkt_size != ret)
170 ✗ av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
171
172 990 c->data_size -= pkt_size + 1;
173 }
174 990 return ret;
175 }
176
177
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 10 if (avio_tell(pb) & 1 && avio_r8(pb))
178 ✗ av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
179
180 10 tag = avio_rl32(pb);
181 10 chunk_size = avio_rl32(pb);
182
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 10 switch (tag) {
183 2 case MKTAG('v', 'r', 'a', 't'):
184
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 2 if (avio_rl32(pb)) // var-rate-flag
185 2 s->packet_size = 0;
186 2 avio_skip(pb, 4); // size-in-packets
187 2 break;
188 2 case MKTAG('d', 'a', 't', 'a'):
189 2 c->data_size = chunk_size;
190 2 break;
191
192 6 default:
193 6 avio_skip(pb, chunk_size);
194 }
195 }
196 2 return AVERROR_EOF;
197 }
198
199 const FFInputFormat ff_qcp_demuxer = {
200 .p.name = "qcp",
201 .p.long_name = NULL_IF_CONFIG_SMALL("QCP"),
202 .priv_data_size = sizeof(QCPContext),
203 .read_probe = qcp_probe,
204 .read_header = qcp_read_header,
205 .read_packet = qcp_read_packet,
206 };
207