FFmpeg
hca.c
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1 /*
2  * HCA demuxer
3  * Copyright (c) 2020 Paul B Mahol
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 #include "libavutil/opt.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavcodec/bytestream.h"
25 
26 #include "avformat.h"
27 #include "internal.h"
28 
29 #define HCA_MASK 0x7f7f7f7f
30 
31 typedef struct HCADemuxContext {
32  AVClass *class;
33  int64_t keyl;
34  int64_t keyh;
35  int subkey;
37 
38 static int hca_probe(const AVProbeData *p)
39 {
40  if ((AV_RL32(p->buf) & HCA_MASK) != MKTAG('H', 'C', 'A', 0))
41  return 0;
42 
43  if ((AV_RL32(p->buf + 8) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
44  return 0;
45 
46  return AVPROBE_SCORE_MAX / 3;
47 }
48 
50 {
51  HCADemuxContext *hca = s->priv_data;
52  AVCodecParameters *par;
53  GetByteContext gb;
54  AVIOContext *pb = s->pb;
55  AVStream *st;
56  uint32_t chunk;
57  uint16_t version;
58  uint32_t block_count;
59  uint16_t block_size, data_offset;
60  int ret;
61 
62  avio_skip(pb, 4);
63  version = avio_rb16(pb);
64 
65  data_offset = avio_rb16(pb);
66  if (data_offset <= 8)
67  return AVERROR_INVALIDDATA;
68 
69  st = avformat_new_stream(s, NULL);
70  if (!st)
71  return AVERROR(ENOMEM);
72 
73  par = st->codecpar;
74  ret = ff_alloc_extradata(par, data_offset + 10);
75  if (ret < 0)
76  return ret;
77 
78  ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8 - 10);
79  if (ret < par->extradata_size - 8 - 10)
80  return AVERROR(EIO);
81  AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
82  AV_WB16(par->extradata + 4, version);
83  AV_WB16(par->extradata + 6, data_offset);
84  AV_WB32(par->extradata + par->extradata_size - 10, hca->keyh);
85  AV_WB32(par->extradata + par->extradata_size - 6, hca->keyl);
86  AV_WB16(par->extradata + par->extradata_size - 2, hca->subkey);
87 
88  bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
89 
90  if ((bytestream2_get_le32(&gb) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
91  return AVERROR_INVALIDDATA;
92 
95  par->codec_tag = 0;
96  st->codecpar->ch_layout.nb_channels = bytestream2_get_byte(&gb);
97  par->sample_rate = bytestream2_get_be24(&gb);
98  block_count = bytestream2_get_be32(&gb);
99  bytestream2_skip(&gb, 4);
100  chunk = bytestream2_get_le32(&gb) & HCA_MASK;
101  if (chunk == MKTAG('c', 'o', 'm', 'p')) {
102  block_size = bytestream2_get_be16(&gb);
103  } else if (chunk == MKTAG('d', 'e', 'c', 0)) {
104  block_size = bytestream2_get_be16(&gb);
105  } else {
106  return AVERROR_INVALIDDATA;
107  }
108 
109  if (block_size < 8)
110  return AVERROR_INVALIDDATA;
111  par->block_align = block_size;
112  st->duration = 1024 * block_count;
113 
114  avio_seek(pb, data_offset, SEEK_SET);
115  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
116 
117  return 0;
118 }
119 
121 {
122  AVCodecParameters *par = s->streams[0]->codecpar;
123  int ret;
124 
125  ret = av_get_packet(s->pb, pkt, par->block_align);
126  pkt->duration = 1024;
127  return ret;
128 }
129 
130 #define OFFSET(x) offsetof(HCADemuxContext, x)
131 static const AVOption hca_options[] = {
132  { "hca_lowkey",
133  "Low key used for handling CRI HCA files", OFFSET(keyl),
134  AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
135  { "hca_highkey",
136  "High key used for handling CRI HCA files", OFFSET(keyh),
137  AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
138  { "hca_subkey",
139  "Subkey used for handling CRI HCA files", OFFSET(subkey),
140  AV_OPT_TYPE_INT, {.i64=0}, .min = 0, .max = UINT16_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM },
141  { NULL },
142 };
143 
144 static const AVClass hca_class = {
145  .class_name = "hca",
146  .item_name = av_default_item_name,
147  .option = hca_options,
148  .version = LIBAVUTIL_VERSION_INT,
149 };
150 
152  .name = "hca",
153  .long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
154  .priv_class = &hca_class,
155  .priv_data_size = sizeof(HCADemuxContext),
159  .extensions = "hca",
161 };
hca_class
static const AVClass hca_class
Definition: hca.c:144
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
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
opt.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:424
GetByteContext
Definition: bytestream.h:33
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
hca_options
static const AVOption hca_options[]
Definition: hca.c:131
AVOption
AVOption.
Definition: opt.h:251
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:540
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:323
HCA_MASK
#define HCA_MASK
Definition: hca.c:29
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:464
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
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:830
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
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:549
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:41
hca_read_packet
static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: hca.c:120
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
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
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:226
AVFormatContext
Format I/O context.
Definition: avformat.h:1202
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
HCADemuxContext::subkey
int subkey
Definition: hca.c:35
NULL
#define NULL
Definition: coverity.c:32
AV_WB16
#define AV_WB16(p, v)
Definition: intreadwrite.h:403
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:452
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
ff_hca_demuxer
const AVInputFormat ff_hca_demuxer
Definition: hca.c:151
hca_read_header
static int hca_read_header(AVFormatContext *s)
Definition: hca.c:49
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
AV_WB32
#define AV_WB32(p, v)
Definition: intreadwrite.h:417
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
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
version
version
Definition: libkvazaar.c:321
OFFSET
#define OFFSET(x)
Definition: hca.c:130
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:178
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:282
hca_probe
static int hca_probe(const AVProbeData *p)
Definition: hca.c:38
av_get_packet
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:103
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
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:793
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
HCADemuxContext::keyh
int64_t keyh
Definition: hca.c:34
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:659
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:365
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:29
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
HCADemuxContext::keyl
int64_t keyl
Definition: hca.c:33
HCADemuxContext
Definition: hca.c:31
AV_CODEC_ID_HCA
@ AV_CODEC_ID_HCA
Definition: codec_id.h:536
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:239