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2ba45a60 DM |
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" | |
f6fa7814 | 33 | #include "riff.h" |
2ba45a60 DM |
34 | |
35 | typedef struct { | |
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 | /** | |
61 | * SMV GUID as stored in the file | |
62 | */ | |
63 | static const uint8_t guid_smv[16] = { | |
64 | 0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed, | |
65 | 0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84 | |
66 | }; | |
67 | ||
68 | /** | |
69 | * @param guid contains at least 16 bytes | |
70 | * @return 1 if the guid is a qcelp_13k guid, 0 otherwise | |
71 | */ | |
72 | static int is_qcelp_13k_guid(const uint8_t *guid) { | |
73 | return (guid[0] == 0x41 || guid[0] == 0x42) | |
74 | && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part)); | |
75 | } | |
76 | ||
77 | static int qcp_probe(AVProbeData *pd) | |
78 | { | |
79 | if (AV_RL32(pd->buf ) == AV_RL32("RIFF") && | |
80 | AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt ")) | |
81 | return AVPROBE_SCORE_MAX; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int qcp_read_header(AVFormatContext *s) | |
86 | { | |
87 | AVIOContext *pb = s->pb; | |
88 | QCPContext *c = s->priv_data; | |
89 | AVStream *st = avformat_new_stream(s, NULL); | |
90 | uint8_t buf[16]; | |
91 | int i, nb_rates; | |
92 | ||
93 | if (!st) | |
94 | return AVERROR(ENOMEM); | |
95 | ||
96 | avio_rb32(pb); // "RIFF" | |
97 | avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version | |
98 | ||
99 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
100 | st->codec->channels = 1; | |
101 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
102 | avio_read(pb, buf, 16); | |
103 | if (is_qcelp_13k_guid(buf)) { | |
104 | st->codec->codec_id = AV_CODEC_ID_QCELP; | |
105 | } else if (!memcmp(buf, guid_evrc, 16)) { | |
106 | st->codec->codec_id = AV_CODEC_ID_EVRC; | |
107 | } else if (!memcmp(buf, guid_smv, 16)) { | |
108 | st->codec->codec_id = AV_CODEC_ID_SMV; | |
109 | } else { | |
f6fa7814 DM |
110 | av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n", |
111 | FF_ARG_GUID(buf)); | |
2ba45a60 DM |
112 | return AVERROR_INVALIDDATA; |
113 | } | |
114 | avio_skip(pb, 2 + 80); // codec-version + codec-name | |
115 | st->codec->bit_rate = avio_rl16(pb); | |
116 | ||
117 | s->packet_size = avio_rl16(pb); | |
118 | avio_skip(pb, 2); // block-size | |
119 | st->codec->sample_rate = avio_rl16(pb); | |
120 | avio_skip(pb, 2); // sample-size | |
121 | ||
122 | memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode)); | |
123 | nb_rates = avio_rl32(pb); | |
124 | nb_rates = FFMIN(nb_rates, 8); | |
125 | for (i=0; i<nb_rates; i++) { | |
126 | int size = avio_r8(pb); | |
127 | int mode = avio_r8(pb); | |
128 | if (mode > QCP_MAX_MODE) { | |
129 | av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size); | |
130 | } else | |
131 | c->rates_per_mode[mode] = size; | |
132 | } | |
133 | avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt) | |
139 | { | |
140 | AVIOContext *pb = s->pb; | |
141 | QCPContext *c = s->priv_data; | |
142 | unsigned int chunk_size, tag; | |
143 | ||
144 | while(!avio_feof(pb)) { | |
145 | if (c->data_size) { | |
146 | int pkt_size, ret, mode = avio_r8(pb); | |
147 | ||
148 | if (s->packet_size) { | |
149 | pkt_size = s->packet_size - 1; | |
150 | } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) { | |
151 | c->data_size--; | |
152 | continue; | |
153 | } | |
154 | ||
155 | if (c->data_size <= pkt_size) { | |
156 | av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n"); | |
157 | pkt_size = c->data_size - 1; | |
158 | } | |
159 | ||
160 | if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) { | |
161 | if (pkt_size != ret) | |
162 | av_log(s, AV_LOG_ERROR, "Packet size is too small.\n"); | |
163 | ||
164 | c->data_size -= pkt_size + 1; | |
165 | } | |
166 | return ret; | |
167 | } | |
168 | ||
169 | if (avio_tell(pb) & 1 && avio_r8(pb)) | |
170 | av_log(s, AV_LOG_WARNING, "Padding should be 0.\n"); | |
171 | ||
172 | tag = avio_rl32(pb); | |
173 | chunk_size = avio_rl32(pb); | |
174 | switch (tag) { | |
175 | case MKTAG('v', 'r', 'a', 't'): | |
176 | if (avio_rl32(pb)) // var-rate-flag | |
177 | s->packet_size = 0; | |
178 | avio_skip(pb, 4); // size-in-packets | |
179 | break; | |
180 | case MKTAG('d', 'a', 't', 'a'): | |
181 | c->data_size = chunk_size; | |
182 | break; | |
183 | ||
184 | default: | |
185 | avio_skip(pb, chunk_size); | |
186 | } | |
187 | } | |
188 | return AVERROR_EOF; | |
189 | } | |
190 | ||
191 | AVInputFormat ff_qcp_demuxer = { | |
192 | .name = "qcp", | |
193 | .long_name = NULL_IF_CONFIG_SMALL("QCP"), | |
194 | .priv_data_size = sizeof(QCPContext), | |
195 | .read_probe = qcp_probe, | |
196 | .read_header = qcp_read_header, | |
197 | .read_packet = qcp_read_packet, | |
198 | }; |