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 "riff.h"
34
35 typedef struct QCPContext {
36 uint32_t data_size; ///< size of data chunk
37
38 #define QCP_MAX_MODE 4
39 int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
40 ///< to each mode, -1 if no size.
41 } QCPContext;
42
43 /**
44 * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
45 * the first byte of the GUID can be either 0x41 or 0x42.
46 */
47 static const uint8_t guid_qcelp_13k_part[15] = {
48 0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
49 0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
50 };
51
52 /**
53 * EVRC GUID as stored in the file
54 */
55 static const uint8_t guid_evrc[16] = {
56 0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
57 0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
58 };
59
60 static const uint8_t guid_4gv[16] = {
61 0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
62 0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
63 };
64
65 /**
66 * SMV GUID as stored in the file
67 */
68 static const uint8_t guid_smv[16] = {
69 0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
70 0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
71 };
72
73 /**
74 * @param guid contains at least 16 bytes
75 * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
76 */
is_qcelp_13k_guid(const uint8_t * guid)77 static int is_qcelp_13k_guid(const uint8_t *guid) {
78 return (guid[0] == 0x41 || guid[0] == 0x42)
79 && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
80 }
81
qcp_probe(const AVProbeData * pd)82 static int qcp_probe(const AVProbeData *pd)
83 {
84 if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
85 AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
86 return AVPROBE_SCORE_MAX;
87 return 0;
88 }
89
qcp_read_header(AVFormatContext * s)90 static int qcp_read_header(AVFormatContext *s)
91 {
92 AVIOContext *pb = s->pb;
93 QCPContext *c = s->priv_data;
94 AVStream *st = avformat_new_stream(s, NULL);
95 uint8_t buf[16];
96 int i;
97 unsigned nb_rates;
98
99 if (!st)
100 return AVERROR(ENOMEM);
101
102 avio_rb32(pb); // "RIFF"
103 avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
104
105 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
106 st->codecpar->channels = 1;
107 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
108 avio_read(pb, buf, 16);
109 if (is_qcelp_13k_guid(buf)) {
110 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 avio_skip(pb, 2 + 80); // codec-version + codec-name
123 st->codecpar->bit_rate = avio_rl16(pb);
124
125 s->packet_size = avio_rl16(pb);
126 avio_skip(pb, 2); // block-size
127 st->codecpar->sample_rate = avio_rl16(pb);
128 avio_skip(pb, 2); // sample-size
129
130 memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
131 nb_rates = avio_rl32(pb);
132 nb_rates = FFMIN(nb_rates, 8);
133 for (i=0; i<nb_rates; i++) {
134 int size = avio_r8(pb);
135 int mode = avio_r8(pb);
136 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 c->rates_per_mode[mode] = size;
140 }
141 avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
142
143 return 0;
144 }
145
qcp_read_packet(AVFormatContext * s,AVPacket * pkt)146 static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
147 {
148 AVIOContext *pb = s->pb;
149 QCPContext *c = s->priv_data;
150 unsigned int chunk_size, tag;
151
152 while(!avio_feof(pb)) {
153 if (c->data_size) {
154 int pkt_size, ret, mode = avio_r8(pb);
155
156 if (s->packet_size) {
157 pkt_size = s->packet_size - 1;
158 } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
159 c->data_size--;
160 continue;
161 }
162
163 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 if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
169 if (pkt_size != ret)
170 av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
171
172 c->data_size -= pkt_size + 1;
173 }
174 return ret;
175 }
176
177 if (avio_tell(pb) & 1 && avio_r8(pb))
178 av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
179
180 tag = avio_rl32(pb);
181 chunk_size = avio_rl32(pb);
182 switch (tag) {
183 case MKTAG('v', 'r', 'a', 't'):
184 if (avio_rl32(pb)) // var-rate-flag
185 s->packet_size = 0;
186 avio_skip(pb, 4); // size-in-packets
187 break;
188 case MKTAG('d', 'a', 't', 'a'):
189 c->data_size = chunk_size;
190 break;
191
192 default:
193 avio_skip(pb, chunk_size);
194 }
195 }
196 return AVERROR_EOF;
197 }
198
199 AVInputFormat ff_qcp_demuxer = {
200 .name = "qcp",
201 .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