FFmpeg
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 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 
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "riff.h"
34 
35 typedef struct QCPContext {
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 static const uint8_t guid_4gv[16] = {
61  0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
62  0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
63 };
64 
65 /**
66  * SMV GUID as stored in the file
67  */
68 static const uint8_t guid_smv[16] = {
69  0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
70  0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
71 };
72 
73 /**
74  * @param guid contains at least 16 bytes
75  * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
76  */
77 static int is_qcelp_13k_guid(const uint8_t *guid) {
78  return (guid[0] == 0x41 || guid[0] == 0x42)
79  && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
80 }
81 
82 static int qcp_probe(const AVProbeData *pd)
83 {
84  if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
85  AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
86  return AVPROBE_SCORE_MAX;
87  return 0;
88 }
89 
91 {
92  AVIOContext *pb = s->pb;
93  QCPContext *c = s->priv_data;
95  uint8_t buf[16];
96  int i, nb_rates;
97 
98  if (!st)
99  return AVERROR(ENOMEM);
100 
101  avio_rb32(pb); // "RIFF"
102  avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
103 
105  st->codecpar->channels = 1;
107  avio_read(pb, buf, 16);
108  if (is_qcelp_13k_guid(buf)) {
110  } else if (!memcmp(buf, guid_evrc, 16)) {
112  } else if (!memcmp(buf, guid_smv, 16)) {
114  } else if (!memcmp(buf, guid_4gv, 16)) {
116  } else {
117  av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
118  FF_ARG_GUID(buf));
119  return AVERROR_INVALIDDATA;
120  }
121  avio_skip(pb, 2 + 80); // codec-version + codec-name
122  st->codecpar->bit_rate = avio_rl16(pb);
123 
124  s->packet_size = avio_rl16(pb);
125  avio_skip(pb, 2); // block-size
126  st->codecpar->sample_rate = avio_rl16(pb);
127  avio_skip(pb, 2); // sample-size
128 
129  memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
130  nb_rates = avio_rl32(pb);
131  nb_rates = FFMIN(nb_rates, 8);
132  for (i=0; i<nb_rates; i++) {
133  int size = avio_r8(pb);
134  int mode = avio_r8(pb);
135  if (mode > QCP_MAX_MODE) {
136  av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
137  } else
138  c->rates_per_mode[mode] = size;
139  }
140  avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
141 
142  return 0;
143 }
144 
146 {
147  AVIOContext *pb = s->pb;
148  QCPContext *c = s->priv_data;
149  unsigned int chunk_size, tag;
150 
151  while(!avio_feof(pb)) {
152  if (c->data_size) {
153  int pkt_size, ret, mode = avio_r8(pb);
154 
155  if (s->packet_size) {
156  pkt_size = s->packet_size - 1;
157  } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
158  c->data_size--;
159  continue;
160  }
161 
162  if (c->data_size <= pkt_size) {
163  av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
164  pkt_size = c->data_size - 1;
165  }
166 
167  if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
168  if (pkt_size != ret)
169  av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
170 
171  c->data_size -= pkt_size + 1;
172  }
173  return ret;
174  }
175 
176  if (avio_tell(pb) & 1 && avio_r8(pb))
177  av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
178 
179  tag = avio_rl32(pb);
180  chunk_size = avio_rl32(pb);
181  switch (tag) {
182  case MKTAG('v', 'r', 'a', 't'):
183  if (avio_rl32(pb)) // var-rate-flag
184  s->packet_size = 0;
185  avio_skip(pb, 4); // size-in-packets
186  break;
187  case MKTAG('d', 'a', 't', 'a'):
188  c->data_size = chunk_size;
189  break;
190 
191  default:
192  avio_skip(pb, chunk_size);
193  }
194  }
195  return AVERROR_EOF;
196 }
197 
199  .name = "qcp",
200  .long_name = NULL_IF_CONFIG_SMALL("QCP"),
201  .priv_data_size = sizeof(QCPContext),
205 };
unsigned int packet_size
Definition: avformat.h:1482
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static const uint8_t guid_smv[16]
SMV GUID as stored in the file.
Definition: qcp.c:68
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define FF_ARG_GUID(g)
Definition: riff.h:105
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3959
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
uint64_t_TMPL AV_RL64
Definition: bytestream.h:87
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: qcp.c:145
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
uint32_t data_size
size of data chunk
Definition: qcp.c:36
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4470
uint32_t tag
Definition: movenc.c:1531
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:310
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4061
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3988
static const uint8_t guid_4gv[16]
Definition: qcp.c:60
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3955
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
audio channel layout utility functions
#define FFMIN(a, b)
Definition: common.h:96
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int qcp_read_header(AVFormatContext *s)
Definition: qcp.c:90
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void * buf
Definition: avisynth_c.h:766
AVInputFormat ff_qcp_demuxer
Definition: qcp.c:198
static const uint8_t guid_evrc[16]
EVRC GUID as stored in the file.
Definition: qcp.c:55
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:47
#define QCP_MAX_MODE
Definition: qcp.c:38
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4069
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:39
#define FF_PRI_GUID
Definition: riff.h:101
void * priv_data
Format private data.
Definition: avformat.h:1386
Definition: qcp.c:35
static int is_qcelp_13k_guid(const uint8_t *guid)
Definition: qcp.c:77
static int qcp_probe(const AVProbeData *pd)
Definition: qcp.c:82
int channels
Audio only.
Definition: avcodec.h:4065
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1456
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83