FFmpeg
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:200
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:4869
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:253
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
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:4450
#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:305
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:194
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
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:3259
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
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:560
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:743
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:751
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: packet.h:340