635d531f44389b29267bf824dbafb23df2cdd0ed
[libav.git] / libavformat / qcp.c
1 /*
2 * QCP format (.qcp) demuxer
3 * Copyright (c) 2009 Kenan Gillet
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * @sa RFC 3625: "The QCP File Format and Media Types for Speech Data"
27 * http://tools.ietf.org/html/rfc3625
28 */
29
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32
33 typedef struct {
34 uint32_t data_size; ///< size of data chunk
35
36 #define QCP_MAX_MODE 4
37 int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
38 ///< to each mode, -1 if no size.
39 } QCPContext;
40
41 /**
42 * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
43 * the first byte of the GUID can be either 0x41 or 0x42.
44 */
45 static const uint8_t guid_qcelp_13k_part[15] = {
46 0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
47 0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
48 };
49
50 /**
51 * EVRC GUID as stored in the file
52 */
53 static const uint8_t guid_evrc[16] = {
54 0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
55 0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
56 };
57
58 /**
59 * SMV GUID as stored in the file
60 */
61 static const uint8_t guid_smv[16] = {
62 0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
63 0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
64 };
65
66 /**
67 * @param guid contains at least 16 bytes
68 * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
69 */
70 static int is_qcelp_13k_guid(const uint8_t *guid) {
71 return (guid[0] == 0x41 || guid[0] == 0x42)
72 && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
73 }
74
75 static int qcp_probe(AVProbeData *pd)
76 {
77 if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
78 AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
79 return AVPROBE_SCORE_MAX;
80 return 0;
81 }
82
83 static int qcp_read_header(AVFormatContext *s, AVFormatParameters *ap)
84 {
85 AVIOContext *pb = s->pb;
86 QCPContext *c = s->priv_data;
87 AVStream *st = av_new_stream(s, 0);
88 uint8_t buf[16];
89 int i, nb_rates;
90
91 if (!st)
92 return AVERROR(ENOMEM);
93
94 avio_rb32(pb); // "RIFF"
95 s->file_size = avio_rl32(pb) + 8;
96 avio_skip(pb, 8 + 4 + 1 + 1); // "QLCMfmt " + chunk-size + major-version + minor-version
97
98 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
99 st->codec->channels = 1;
100 avio_read(pb, buf, 16);
101 if (is_qcelp_13k_guid(buf)) {
102 st->codec->codec_id = CODEC_ID_QCELP;
103 } else if (!memcmp(buf, guid_evrc, 16)) {
104 av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
105 return AVERROR_PATCHWELCOME;
106 } else if (!memcmp(buf, guid_smv, 16)) {
107 av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
108 return AVERROR_PATCHWELCOME;
109 } else {
110 av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
111 return AVERROR_INVALIDDATA;
112 }
113 avio_skip(pb, 2 + 80); // codec-version + codec-name
114 st->codec->bit_rate = avio_rl16(pb);
115
116 s->packet_size = avio_rl16(pb);
117 avio_skip(pb, 2); // block-size
118 st->codec->sample_rate = avio_rl16(pb);
119 avio_skip(pb, 2); // sample-size
120
121 memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
122 nb_rates = avio_rl32(pb);
123 nb_rates = FFMIN(nb_rates, 8);
124 for (i=0; i<nb_rates; i++) {
125 int size = avio_r8(pb);
126 int mode = avio_r8(pb);
127 if (mode > QCP_MAX_MODE) {
128 av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
129 } else
130 c->rates_per_mode[mode] = size;
131 }
132 avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
133
134 return 0;
135 }
136
137 static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
138 {
139 AVIOContext *pb = s->pb;
140 QCPContext *c = s->priv_data;
141 unsigned int chunk_size, tag;
142
143 while(!pb->eof_reached) {
144 if (c->data_size) {
145 int pkt_size, ret, mode = avio_r8(pb);
146
147 if (s->packet_size) {
148 pkt_size = s->packet_size - 1;
149 } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
150 c->data_size--;
151 continue;
152 }
153
154 if (c->data_size <= pkt_size) {
155 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
156 pkt_size = c->data_size - 1;
157 }
158
159 if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
160 if (pkt_size != ret)
161 av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
162
163 c->data_size -= pkt_size + 1;
164 }
165 return ret;
166 }
167
168 if (avio_tell(pb) & 1 && avio_r8(pb))
169 av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
170
171 tag = avio_rl32(pb);
172 chunk_size = avio_rl32(pb);
173 switch (tag) {
174 case MKTAG('v', 'r', 'a', 't'):
175 if (avio_rl32(pb)) // var-rate-flag
176 s->packet_size = 0;
177 avio_skip(pb, 4); // size-in-packets
178 break;
179 case MKTAG('d', 'a', 't', 'a'):
180 c->data_size = chunk_size;
181 break;
182
183 default:
184 avio_skip(pb, chunk_size);
185 }
186 }
187 return AVERROR_EOF;
188 }
189
190 AVInputFormat ff_qcp_demuxer = {
191 .name = "qcp",
192 .long_name = NULL_IF_CONFIG_SMALL("QCP format"),
193 .priv_data_size = sizeof(QCPContext),
194 .read_probe = qcp_probe,
195 .read_header = qcp_read_header,
196 .read_packet = qcp_read_packet,
197 };