qcp.c
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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 
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32 
33 typedef struct {
34  uint32_t data_size;
35 
36 #define QCP_MAX_MODE 4
37  int16_t rates_per_mode[QCP_MAX_MODE+1];
38 } QCPContext;
40 
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 
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 
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 
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 
84 {
85  AVIOContext *pb = s->pb;
86  QCPContext *c = s->priv_data;
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  avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
96 
98  st->codec->channels = 1;
99  avio_read(pb, buf, 16);
100  if (is_qcelp_13k_guid(buf)) {
102  } else if (!memcmp(buf, guid_evrc, 16)) {
103  av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
104  return AVERROR_PATCHWELCOME;
105  } else if (!memcmp(buf, guid_smv, 16)) {
106  av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
107  return AVERROR_PATCHWELCOME;
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 
137 {
138  AVIOContext *pb = s->pb;
139  QCPContext *c = s->priv_data;
140  unsigned int chunk_size, tag;
141 
142  while(!pb->eof_reached) {
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 
190  .name = "qcp",
191  .long_name = NULL_IF_CONFIG_SMALL("QCP format"),
192  .priv_data_size = sizeof(QCPContext),
196 };
unsigned int packet_size
Definition: avformat.h:973
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
static const uint8_t guid_smv[16]
SMV GUID as stored in the file.
Definition: qcp.c:61
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:117
Format I/O context.
Definition: avformat.h:863
#define AV_RL64
Definition: intreadwrite.h:173
static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: qcp.c:136
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:769
uint32_t data_size
size of data chunk
Definition: qcp.c:34
static int read_header(FFV1Context *f)
Definition: ffv1.c:1513
uint32_t tag
Definition: movenc.c:670
#define AVERROR_EOF
End of file.
Definition: error.h:51
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:269
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:492
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:652
static int qcp_read_header(AVFormatContext *s, AVFormatParameters *ap)
Definition: qcp.c:83
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:738
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
AV_RL32
Definition: bytestream.h:89
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2776
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
AVCodecContext * codec
codec context
Definition: avformat.h:623
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:341
int bit_rate
the average bitrate
Definition: avcodec.h:1340
#define FFMIN(a, b)
Definition: common.h:55
static int qcp_probe(AVProbeData *pd)
Definition: qcp.c:75
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:483
static int read_probe(AVProbeData *p)
Definition: img2.c:185
Stream structure.
Definition: avformat.h:620
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
Definition: error.h:57
NULL
Definition: eval.c:50
enum AVMediaType codec_type
Definition: avcodec.h:1574
int sample_rate
samples per second
Definition: avcodec.h:1456
AVIOContext * pb
Definition: avformat.h:896
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:109
AVInputFormat ff_qcp_demuxer
Definition: qcp.c:189
static const uint8_t guid_evrc[16]
EVRC GUID as stored in the file.
Definition: qcp.c:53
static const uint8_t guid_qcelp_13k_part[15]
Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file; the first byte of the GUID can be e...
Definition: qcp.c:45
#define QCP_MAX_MODE
Definition: qcp.c:36
This structure contains the data a format has to probe a file.
Definition: avformat.h:339
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:345
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:722
Main libavformat public API header.
int16_t rates_per_mode[QCP_MAX_MODE+1]
contains the packet size corresponding to each mode, -1 if no size.
Definition: qcp.c:37
int eof_reached
true if eof reached
Definition: avio.h:98
int channels
number of audio channels
Definition: avcodec.h:1457
void * priv_data
Format private data.
Definition: avformat.h:883
Definition: qcp.c:33
static int is_qcelp_13k_guid(const uint8_t *guid)
Definition: qcp.c:70
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:460
#define MKTAG(a, b, c, d)
Definition: common.h:231
enum CodecID codec_id
Definition: avcodec.h:1575