Libav
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 
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 
34 typedef struct {
35  uint32_t data_size;
36 
37 #define QCP_MAX_MODE 4
38  int16_t rates_per_mode[QCP_MAX_MODE+1];
39 } QCPContext;
41 
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 
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 
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 
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 
85 {
86  AVIOContext *pb = s->pb;
87  QCPContext *c = s->priv_data;
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 
99  st->codec->channels = 1;
101  avio_read(pb, buf, 16);
102  if (is_qcelp_13k_guid(buf)) {
104  } else if (!memcmp(buf, guid_evrc, 16)) {
105  av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
106  return AVERROR_PATCHWELCOME;
107  } else if (!memcmp(buf, guid_smv, 16)) {
108  av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
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->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 
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 
192  .name = "qcp",
193  .long_name = NULL_IF_CONFIG_SMALL("QCP"),
194  .priv_data_size = sizeof(QCPContext),
198 };
unsigned int packet_size
Definition: avformat.h:971
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:62
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
Format I/O context.
Definition: avformat.h:871
#define AV_RL64
Definition: intreadwrite.h:173
static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: qcp.c:138
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:589
uint32_t data_size
size of data chunk
Definition: qcp.c:35
uint32_t tag
Definition: movenc.c:822
#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:118
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:446
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:558
#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:142
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2662
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1840
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:437
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:702
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:390
int bit_rate
the average bitrate
Definition: avcodec.h:1112
audio channel layout utility functions
#define FFMIN(a, b)
Definition: common.h:57
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int qcp_probe(AVProbeData *pd)
Definition: qcp.c:76
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
#define AV_RL32
Definition: intreadwrite.h:146
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:536
Stream structure.
Definition: avformat.h:683
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
Definition: error.h:57
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1062
static int qcp_read_header(AVFormatContext *s)
Definition: qcp.c:84
enum AVCodecID codec_id
Definition: avcodec.h:1065
int sample_rate
samples per second
Definition: avcodec.h:1779
AVIOContext * pb
I/O context.
Definition: avformat.h:913
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
AVInputFormat ff_qcp_demuxer
Definition: qcp.c:191
static const uint8_t guid_evrc[16]
EVRC GUID as stored in the file.
Definition: qcp.c:54
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:46
#define QCP_MAX_MODE
Definition: qcp.c:37
This structure contains the data a format has to probe a file.
Definition: avformat.h:388
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:395
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:542
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:38
int eof_reached
true if eof reached
Definition: avio.h:96
int channels
number of audio channels
Definition: avcodec.h:1780
void * priv_data
Format private data.
Definition: avformat.h:899
Definition: qcp.c:34
static int is_qcelp_13k_guid(const uint8_t *guid)
Definition: qcp.c:71
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:516
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:950