FFmpeg
qoadec.c
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1 /*
2  * QOA demuxer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avformat.h"
22 #include "avio_internal.h"
23 #include "internal.h"
24 #include "libavutil/intreadwrite.h"
25 
26 static int qoa_probe(const AVProbeData *p)
27 {
28  if ((p->buf_size < 16) ||
29  (AV_RB32(p->buf) != MKBETAG('q','o','a','f')) ||
30  (AV_RB32(p->buf + 4) == 0) ||
31  (p->buf[8] == 0) ||
32  (AV_RB24(p->buf + 9) == 0) ||
33  (AV_RB16(p->buf + 12) == 0) ||
34  (AV_RB16(p->buf + 14) == 0))
35  return 0;
36  return AVPROBE_SCORE_MAX;
37 }
38 
40 {
41  AVIOContext *pb = s->pb;
42  AVStream *st;
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
48  avio_skip(pb, 4);
51  st->duration = avio_rb32(pb);
52  st->start_time = 0;
53 
54  ffio_ensure_seekback(pb, 4);
56  if (st->codecpar->ch_layout.nb_channels == 0)
57  return AVERROR_INVALIDDATA;
58 
59  st->codecpar->sample_rate = avio_rb24(pb);
60  if (st->codecpar->sample_rate == 0)
61  return AVERROR_INVALIDDATA;
62 
63  avio_seek(pb, -4, SEEK_CUR);
64 
65  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
66 
67  return 0;
68 }
69 
71 {
72  AVIOContext *pb = s->pb;
73  uint16_t size, duration;
74  uint8_t hdr[8];
75  int64_t pos;
76  int ret;
77 
78  if (avio_feof(pb))
79  return AVERROR_EOF;
80 
81  pos = avio_tell(pb);
82  ret = avio_read(pb, hdr, sizeof(hdr));
83  if (ret != sizeof(hdr))
84  return AVERROR_EOF;
85 
86  duration = AV_RB16(hdr + 4);
87  size = AV_RB16(hdr + 6);
88  if ((ret = av_new_packet(pkt, size)) < 0)
89  return ret;
90 
91  memcpy(pkt->data, hdr, sizeof(hdr));
92  ret = avio_read(pb, pkt->data + sizeof(hdr), size - sizeof(hdr));
93  if (ret != size - sizeof(hdr))
94  return AVERROR(EIO);
95  pkt->stream_index = 0;
96  pkt->pos = pos;
98 
99  return 0;
100 }
101 
103  .name = "qoa",
104  .long_name = NULL_IF_CONFIG_SMALL("QOA"),
105  .read_probe = qoa_probe,
106  .read_header = qoa_read_header,
107  .read_packet = qoa_read_packet,
108  .flags = AVFMT_GENERIC_INDEX,
109  .extensions = "qoa",
110 };
AVERROR
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVPacket::data
uint8_t * data
Definition: packet.h:522
qoa_read_packet
static int qoa_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: qoadec.c:70
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:540
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:455
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:323
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:464
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:843
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:513
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:481
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:900
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:808
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:549
duration
int64_t duration
Definition: movenc.c:64
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:98
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:554
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:454
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
NULL
#define NULL
Definition: coverity.c:32
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:452
AV_CODEC_ID_QOA
@ AV_CODEC_ID_QOA
Definition: codec_id.h:548
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:206
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:171
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
avio_rb24
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:801
ff_qoa_demuxer
const AVInputFormat ff_qoa_demuxer
Definition: qoadec.c:102
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
size
int size
Definition: twinvq_data.h:10344
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:650
ffio_ensure_seekback
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:1135
avio_internal.h
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:841
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:278
pos
unsigned int pos
Definition: spdifenc.c:413
avformat.h
qoa_read_header
static int qoa_read_header(AVFormatContext *s)
Definition: qoadec.c:39
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:659
AVPacket::stream_index
int stream_index
Definition: packet.h:524
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:365
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
qoa_probe
static int qoa_probe(const AVProbeData *p)
Definition: qoadec.c:26
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:542
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:890
AV_RB24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97
AV_RB16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:98
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:393