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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
35typedef 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 */
47static 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 */
55static 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
60static 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 */
68static 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 */
77static 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
82static int qcp_probe(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
90static 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, nb_rates;
97
98 if (!st)
99 return AVERROR(ENOMEM);
100
101 avio_rb32(pb); // "RIFF"
102 avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
103
104 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
105 st->codecpar->channels = 1;
106 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
107 avio_read(pb, buf, 16);
108 if (is_qcelp_13k_guid(buf)) {
109 st->codecpar->codec_id = AV_CODEC_ID_QCELP;
110 } else if (!memcmp(buf, guid_evrc, 16)) {
111 st->codecpar->codec_id = AV_CODEC_ID_EVRC;
112 } else if (!memcmp(buf, guid_smv, 16)) {
113 st->codecpar->codec_id = AV_CODEC_ID_SMV;
114 } else if (!memcmp(buf, guid_4gv, 16)) {
115 st->codecpar->codec_id = AV_CODEC_ID_4GV;
116 } else {
117 av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
118 FF_ARG_GUID(buf));
119 return AVERROR_INVALIDDATA;
120 }
121 avio_skip(pb, 2 + 80); // codec-version + codec-name
122 st->codecpar->bit_rate = avio_rl16(pb);
123
124 s->packet_size = avio_rl16(pb);
125 avio_skip(pb, 2); // block-size
126 st->codecpar->sample_rate = avio_rl16(pb);
127 avio_skip(pb, 2); // sample-size
128
129 memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
130 nb_rates = avio_rl32(pb);
131 nb_rates = FFMIN(nb_rates, 8);
132 for (i=0; i<nb_rates; i++) {
133 int size = avio_r8(pb);
134 int mode = avio_r8(pb);
135 if (mode > QCP_MAX_MODE) {
136 av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
137 } else
138 c->rates_per_mode[mode] = size;
139 }
140 avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
141
142 return 0;
143}
144
145static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
146{
147 AVIOContext *pb = s->pb;
148 QCPContext *c = s->priv_data;
149 unsigned int chunk_size, tag;
150
151 while(!avio_feof(pb)) {
152 if (c->data_size) {
153 int pkt_size, ret, mode = avio_r8(pb);
154
155 if (s->packet_size) {
156 pkt_size = s->packet_size - 1;
157 } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
158 c->data_size--;
159 continue;
160 }
161
162 if (c->data_size <= pkt_size) {
163 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
164 pkt_size = c->data_size - 1;
165 }
166
167 if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
168 if (pkt_size != ret)
169 av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
170
171 c->data_size -= pkt_size + 1;
172 }
173 return ret;
174 }
175
176 if (avio_tell(pb) & 1 && avio_r8(pb))
177 av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
178
179 tag = avio_rl32(pb);
180 chunk_size = avio_rl32(pb);
181 switch (tag) {
182 case MKTAG('v', 'r', 'a', 't'):
183 if (avio_rl32(pb)) // var-rate-flag
184 s->packet_size = 0;
185 avio_skip(pb, 4); // size-in-packets
186 break;
187 case MKTAG('d', 'a', 't', 'a'):
188 c->data_size = chunk_size;
189 break;
190
191 default:
192 avio_skip(pb, chunk_size);
193 }
194 }
195 return AVERROR_EOF;
196}
197
198AVInputFormat ff_qcp_demuxer = {
199 .name = "qcp",
200 .long_name = NULL_IF_CONFIG_SMALL("QCP"),
201 .priv_data_size = sizeof(QCPContext),
202 .read_probe = qcp_probe,
203 .read_header = qcp_read_header,
204 .read_packet = qcp_read_packet,
205};
206
generated by cgit at 2024-05-17 18:50:16 (GMT)