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 34typedef struct { 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 */ 46static 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 */ 54static 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 */ 62static 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 */ 71static 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 76static 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 84static 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->codec->codec_type = AVMEDIA_TYPE_AUDIO; 99 st->codec->channels = 1; 100 st->codec->channel_layout = AV_CH_LAYOUT_MONO; 101 avio_read(pb, buf, 16); 102 if (is_qcelp_13k_guid(buf)) { 103 st->codec->codec_id = AV_CODEC_ID_QCELP; 104 } else if (!memcmp(buf, guid_evrc, 16)) { 105 st->codec->codec_id = AV_CODEC_ID_EVRC; 106 } else if (!memcmp(buf, guid_smv, 16)) { 107 st->codec->codec_id = AV_CODEC_ID_SMV; 108 } else { 109 av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n"); 110 return AVERROR_INVALIDDATA; 111 } 112 avio_skip(pb, 2 + 80); // codec-version + codec-name 113 st->codec->bit_rate = avio_rl16(pb); 114 115 s->packet_size = avio_rl16(pb); 116 avio_skip(pb, 2); // block-size 117 st->codec->sample_rate = avio_rl16(pb); 118 avio_skip(pb, 2); // sample-size 119 120 memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode)); 121 nb_rates = avio_rl32(pb); 122 nb_rates = FFMIN(nb_rates, 8); 123 for (i=0; i<nb_rates; i++) { 124 int size = avio_r8(pb); 125 int mode = avio_r8(pb); 126 if (mode > QCP_MAX_MODE) { 127 av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size); 128 } else 129 c->rates_per_mode[mode] = size; 130 } 131 avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved 132 133 return 0; 134} 135 136static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt) 137{ 138 AVIOContext *pb = s->pb; 139 QCPContext *c = s->priv_data; 140 unsigned int chunk_size, tag; 141 142 while(!url_feof(pb)) { 143 if (c->data_size) { 144 int pkt_size, ret, mode = avio_r8(pb); 145 146 if (s->packet_size) { 147 pkt_size = s->packet_size - 1; 148 } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) { 149 c->data_size--; 150 continue; 151 } 152 153 if (c->data_size <= pkt_size) { 154 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n"); 155 pkt_size = c->data_size - 1; 156 } 157 158 if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) { 159 if (pkt_size != ret) 160 av_log(s, AV_LOG_ERROR, "Packet size is too small.\n"); 161 162 c->data_size -= pkt_size + 1; 163 } 164 return ret; 165 } 166 167 if (avio_tell(pb) & 1 && avio_r8(pb)) 168 av_log(s, AV_LOG_WARNING, "Padding should be 0.\n"); 169 170 tag = avio_rl32(pb); 171 chunk_size = avio_rl32(pb); 172 switch (tag) { 173 case MKTAG('v', 'r', 'a', 't'): 174 if (avio_rl32(pb)) // var-rate-flag 175 s->packet_size = 0; 176 avio_skip(pb, 4); // size-in-packets 177 break; 178 case MKTAG('d', 'a', 't', 'a'): 179 c->data_size = chunk_size; 180 break; 181 182 default: 183 avio_skip(pb, chunk_size); 184 } 185 } 186 return AVERROR_EOF; 187} 188 189AVInputFormat ff_qcp_demuxer = { 190 .name = "qcp", 191 .long_name = NULL_IF_CONFIG_SMALL("QCP"), 192 .priv_data_size = sizeof(QCPContext), 193 .read_probe = qcp_probe, 194 .read_header = qcp_read_header, 195 .read_packet = qcp_read_packet, 196}; 197