h264/aarch64: optimize neon loop filter
[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 * @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
34 typedef struct QCPContext {
35 uint32_t data_size; ///< size of data chunk
36
37 #define QCP_MAX_MODE 4
38 int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
39 ///< to each mode, -1 if no size.
40 } QCPContext;
41
42 /**
43 * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
44 * the first byte of the GUID can be either 0x41 or 0x42.
45 */
46 static const uint8_t guid_qcelp_13k_part[15] = {
47 0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
48 0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
49 };
50
51 /**
52 * EVRC GUID as stored in the file
53 */
54 static const uint8_t guid_evrc[16] = {
55 0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
56 0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
57 };
58
59 /**
60 * SMV GUID as stored in the file
61 */
62 static const uint8_t guid_smv[16] = {
63 0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
64 0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
65 };
66
67 /**
68 * @param guid contains at least 16 bytes
69 * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
70 */
71 static int is_qcelp_13k_guid(const uint8_t *guid) {
72 return (guid[0] == 0x41 || guid[0] == 0x42)
73 && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
74 }
75
76 static int qcp_probe(AVProbeData *pd)
77 {
78 if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
79 AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
80 return AVPROBE_SCORE_MAX;
81 return 0;
82 }
83
84 static int qcp_read_header(AVFormatContext *s)
85 {
86 AVIOContext *pb = s->pb;
87 QCPContext *c = s->priv_data;
88 AVStream *st = avformat_new_stream(s, NULL);
89 uint8_t buf[16];
90 int i, nb_rates;
91
92 if (!st)
93 return AVERROR(ENOMEM);
94
95 avio_rb32(pb); // "RIFF"
96 avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
97
98 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
99 st->codecpar->channels = 1;
100 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
101 avio_read(pb, buf, 16);
102 if (is_qcelp_13k_guid(buf)) {
103 st->codecpar->codec_id = AV_CODEC_ID_QCELP;
104 } else if (!memcmp(buf, guid_evrc, 16)) {
105 avpriv_report_missing_feature(s, "EVRC codec");
106 return AVERROR_PATCHWELCOME;
107 } else if (!memcmp(buf, guid_smv, 16)) {
108 avpriv_report_missing_feature(s, "SMV codec");
109 return AVERROR_PATCHWELCOME;
110 } else {
111 av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
112 return AVERROR_INVALIDDATA;
113 }
114 avio_skip(pb, 2 + 80); // codec-version + codec-name
115 st->codecpar->bit_rate = avio_rl16(pb);
116
117 s->packet_size = avio_rl16(pb);
118 avio_skip(pb, 2); // block-size
119 st->codecpar->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(!pb->eof_reached) {
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 };