FFmpeg  4.3
hnm.c
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1 /*
2  * Cryo Interactive Entertainment HNM4 demuxer
3  *
4  * Copyright (c) 2012 David Kment
5  *
6  * This file is part of FFmpeg .
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg ; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <inttypes.h>
24 
25 #include "libavutil/intreadwrite.h"
26 #include "avformat.h"
27 #include "internal.h"
28 
29 #define HNM4_TAG MKTAG('H', 'N', 'M', '4')
30 
31 #define HNM4_SAMPLE_RATE 22050
32 #define HNM4_FRAME_FPS 24
33 
34 #define HNM4_CHUNK_ID_PL 19536
35 #define HNM4_CHUNK_ID_IZ 23113
36 #define HNM4_CHUNK_ID_IU 21833
37 #define HNM4_CHUNK_ID_SD 17491
38 
39 typedef struct Hnm4DemuxContext {
40  uint32_t frames;
41  uint32_t currentframe;
44 
45 static int hnm_probe(const AVProbeData *p)
46 {
47  if (p->buf_size < 4)
48  return 0;
49 
50  // check for HNM4 header.
51  // currently only HNM v4/v4A is supported
52  if (AV_RL32(&p->buf[0]) == HNM4_TAG)
53  return AVPROBE_SCORE_MAX;
54 
55  return 0;
56 }
57 
59 {
60  Hnm4DemuxContext *hnm = s->priv_data;
61  AVIOContext *pb = s->pb;
62  unsigned width, height;
63  AVStream *vst;
64  int ret;
65 
66  avio_skip(pb, 8);
67  width = avio_rl16(pb);
68  height = avio_rl16(pb);
69  avio_rl32(pb); // filesize
70  hnm->frames = avio_rl32(pb);
71  avio_skip(pb, 44);
72 
73  if (width < 256 || width > 640 ||
74  height < 150 || height > 480) {
76  "invalid resolution: %ux%u\n", width, height);
77  return AVERROR_INVALIDDATA;
78  }
79 
80  if (!(vst = avformat_new_stream(s, NULL)))
81  return AVERROR(ENOMEM);
82 
85  vst->codecpar->codec_tag = 0;
86  vst->codecpar->width = width;
87  vst->codecpar->height = height;
88  if ((ret = ff_alloc_extradata(vst->codecpar, 1)) < 0)
89  return ret;
90 
91  // TODO: find a better way to detect HNM4A
92  vst->codecpar->extradata[0] = width == 640 ? 0x4a : 0x40;
93 
94  vst->start_time = 0;
95 
97 
98  return 0;
99 }
100 
102 {
103  Hnm4DemuxContext *hnm = s->priv_data;
104  AVIOContext *pb = s->pb;
105  int ret = 0;
106 
107  uint32_t superchunk_size, chunk_size;
108  uint16_t chunk_id;
109 
110  if (hnm->currentframe == hnm->frames || pb->eof_reached)
111  return AVERROR_EOF;
112 
113  if (hnm->superchunk_remaining == 0) {
114  /* parse next superchunk */
115  superchunk_size = avio_rl24(pb);
116  avio_skip(pb, 1);
117 
118  hnm->superchunk_remaining = superchunk_size - 4;
119  }
120 
121  chunk_size = avio_rl24(pb);
122  avio_skip(pb, 1);
123  chunk_id = avio_rl16(pb);
124  avio_skip(pb, 2);
125 
126  if (chunk_size > hnm->superchunk_remaining || !chunk_size) {
127  av_log(s, AV_LOG_ERROR,
128  "invalid chunk size: %"PRIu32", offset: %"PRId64"\n",
129  chunk_size, avio_tell(pb));
130  avio_skip(pb, hnm->superchunk_remaining - 8);
131  hnm->superchunk_remaining = 0;
132  }
133 
134  switch (chunk_id) {
135  case HNM4_CHUNK_ID_PL:
136  case HNM4_CHUNK_ID_IZ:
137  case HNM4_CHUNK_ID_IU:
138  avio_seek(pb, -8, SEEK_CUR);
139  ret += av_get_packet(pb, pkt, chunk_size);
140  hnm->superchunk_remaining -= chunk_size;
141  if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU)
142  hnm->currentframe++;
143  break;
144 
145  case HNM4_CHUNK_ID_SD:
146  avio_skip(pb, chunk_size - 8);
147  hnm->superchunk_remaining -= chunk_size;
148  break;
149 
150  default:
151  av_log(s, AV_LOG_WARNING, "unknown chunk found: %"PRIu16", offset: %"PRId64"\n",
152  chunk_id, avio_tell(pb));
153  avio_skip(pb, chunk_size - 8);
154  hnm->superchunk_remaining -= chunk_size;
155  break;
156  }
157 
158  return ret;
159 }
160 
162  .name = "hnm",
163  .long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"),
164  .priv_data_size = sizeof(Hnm4DemuxContext),
169 };
#define NULL
Definition: coverity.c:32
#define AVFMT_NOBINSEARCH
Format does not allow to fall back on binary search via read_timestamp.
Definition: avformat.h:468
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4938
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
static int hnm_probe(const AVProbeData *p)
Definition: hnm.c:45
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
#define HNM4_TAG
Definition: hnm.c:29
Format I/O context.
Definition: avformat.h:1351
uint32_t frames
Definition: hnm.c:40
int width
Video only.
Definition: codec_par.h:126
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4519
#define height
static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: hnm.c:101
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define HNM4_CHUNK_ID_IZ
Definition: hnm.c:35
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:304
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
#define HNM4_FRAME_FPS
Definition: hnm.c:32
#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:747
#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:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
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:3321
uint32_t superchunk_remaining
Definition: hnm.c:42
#define width
AVInputFormat ff_hnm_demuxer
Definition: hnm.c:161
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_RL32
Definition: intreadwrite.h:146
static int hnm_read_header(AVFormatContext *s)
Definition: hnm.c:58
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:469
#define HNM4_CHUNK_ID_PL
Definition: hnm.c:34
#define HNM4_CHUNK_ID_IU
Definition: hnm.c:36
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
#define flags(name, subs,...)
Definition: cbs_av1.c:564
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
uint32_t currentframe
Definition: hnm.c:41
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:731
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:915
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:470
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
void * priv_data
Format private data.
Definition: avformat.h:1379
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
#define HNM4_CHUNK_ID_SD
Definition: hnm.c:37
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:739
This structure stores compressed data.
Definition: packet.h:332