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 {
41  uint16_t width;
42  uint16_t height;
43  uint32_t filesize;
44  uint32_t frames;
45  uint32_t taboffset;
46  uint16_t bits;
47  uint16_t channels;
48  uint32_t framesize;
49  uint32_t currentframe;
50  int64_t pts;
54 
55 static int hnm_probe(const AVProbeData *p)
56 {
57  if (p->buf_size < 4)
58  return 0;
59 
60  // check for HNM4 header.
61  // currently only HNM v4/v4A is supported
62  if (AV_RL32(&p->buf[0]) == HNM4_TAG)
63  return AVPROBE_SCORE_MAX;
64 
65  return 0;
66 }
67 
69 {
70  Hnm4DemuxContext *hnm = s->priv_data;
71  AVIOContext *pb = s->pb;
72  AVStream *vst;
73 
74  /* default context members */
75  hnm->pts = 0;
76  av_init_packet(&hnm->vpkt);
77  hnm->vpkt.data = NULL;
78  hnm->vpkt.size = 0;
79 
80  hnm->superchunk_remaining = 0;
81 
82  avio_skip(pb, 8);
83  hnm->width = avio_rl16(pb);
84  hnm->height = avio_rl16(pb);
85  hnm->filesize = avio_rl32(pb);
86  hnm->frames = avio_rl32(pb);
87  hnm->taboffset = avio_rl32(pb);
88  hnm->bits = avio_rl16(pb);
89  hnm->channels = avio_rl16(pb);
90  hnm->framesize = avio_rl32(pb);
91  avio_skip(pb, 32);
92 
93  hnm->currentframe = 0;
94 
95  if (hnm->width < 256 || hnm->width > 640 ||
96  hnm->height < 150 || hnm->height > 480) {
98  "invalid resolution: %ux%u\n", hnm->width, hnm->height);
99  return AVERROR_INVALIDDATA;
100  }
101 
102  // TODO: find a better way to detect HNM4A
103  if (hnm->width == 640)
104  hnm->version = 0x4a;
105  else
106  hnm->version = 0x40;
107 
108  if (!(vst = avformat_new_stream(s, NULL)))
109  return AVERROR(ENOMEM);
110 
113  vst->codecpar->codec_tag = 0;
114  vst->codecpar->width = hnm->width;
115  vst->codecpar->height = hnm->height;
116  vst->codecpar->extradata = av_mallocz(1);
117 
118  vst->codecpar->extradata_size = 1;
119  memcpy(vst->codecpar->extradata, &hnm->version, 1);
120 
121  vst->start_time = 0;
122 
123  avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS);
124 
125  return 0;
126 }
127 
129 {
130  Hnm4DemuxContext *hnm = s->priv_data;
131  AVIOContext *pb = s->pb;
132  int ret = 0;
133 
134  uint32_t superchunk_size, chunk_size;
135  uint16_t chunk_id;
136 
137  if (hnm->currentframe == hnm->frames || pb->eof_reached)
138  return AVERROR_EOF;
139 
140  if (hnm->superchunk_remaining == 0) {
141  /* parse next superchunk */
142  superchunk_size = avio_rl24(pb);
143  avio_skip(pb, 1);
144 
145  hnm->superchunk_remaining = superchunk_size - 4;
146  }
147 
148  chunk_size = avio_rl24(pb);
149  avio_skip(pb, 1);
150  chunk_id = avio_rl16(pb);
151  avio_skip(pb, 2);
152 
153  if (chunk_size > hnm->superchunk_remaining || !chunk_size) {
154  av_log(s, AV_LOG_ERROR,
155  "invalid chunk size: %"PRIu32", offset: %"PRId64"\n",
156  chunk_size, avio_tell(pb));
157  avio_skip(pb, hnm->superchunk_remaining - 8);
158  hnm->superchunk_remaining = 0;
159  }
160 
161  switch (chunk_id) {
162  case HNM4_CHUNK_ID_PL:
163  case HNM4_CHUNK_ID_IZ:
164  case HNM4_CHUNK_ID_IU:
165  avio_seek(pb, -8, SEEK_CUR);
166  ret += av_get_packet(pb, pkt, chunk_size);
167  hnm->superchunk_remaining -= chunk_size;
168  if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU)
169  hnm->currentframe++;
170  break;
171 
172  case HNM4_CHUNK_ID_SD:
173  avio_skip(pb, chunk_size - 8);
174  hnm->superchunk_remaining -= chunk_size;
175  break;
176 
177  default:
178  av_log(s, AV_LOG_WARNING, "unknown chunk found: %"PRIu16", offset: %"PRId64"\n",
179  chunk_id, avio_tell(pb));
180  avio_skip(pb, chunk_size - 8);
181  hnm->superchunk_remaining -= chunk_size;
182  break;
183  }
184 
185  return ret;
186 }
187 
189 {
190  Hnm4DemuxContext *hnm = s->priv_data;
191 
192  if (hnm->vpkt.size > 0)
193  av_packet_unref(&hnm->vpkt);
194 
195  return 0;
196 }
197 
199  .name = "hnm",
200  .long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"),
201  .priv_data_size = sizeof(Hnm4DemuxContext),
207 };
#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:473
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
uint8_t version
Definition: hnm.c:40
#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:4892
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
static int hnm_probe(const AVProbeData *p)
Definition: hnm.c:55
int size
Definition: avcodec.h:1478
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static AVPacket pkt
#define HNM4_TAG
Definition: hnm.c:29
AVPacket vpkt
Definition: hnm.c:52
int64_t pts
Definition: hnm.c:50
uint16_t bits
Definition: hnm.c:46
Format I/O context.
Definition: avformat.h:1358
uint32_t frames
Definition: hnm.c:44
uint16_t channels
Definition: hnm.c:47
uint8_t
int width
Video only.
Definition: avcodec.h:4023
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4465
static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: hnm.c:128
uint8_t * data
Definition: avcodec.h:1477
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define HNM4_CHUNK_ID_IZ
Definition: hnm.c:35
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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
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: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:3953
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3975
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
uint32_t superchunk_remaining
Definition: hnm.c:51
uint32_t taboffset
Definition: hnm.c:45
AVInputFormat ff_hnm_demuxer
Definition: hnm.c:198
#define s(width, name)
Definition: cbs_vp9.c:257
static int hnm_read_header(AVFormatContext *s)
Definition: hnm.c:68
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 hnm_read_close(AVFormatContext *s)
Definition: hnm.c:188
uint32_t framesize
Definition: hnm.c:48
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:474
#define HNM4_CHUNK_ID_PL
Definition: hnm.c:34
uint16_t height
Definition: hnm.c:42
#define HNM4_CHUNK_ID_IU
Definition: hnm.c:36
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
uint16_t width
Definition: hnm.c:41
uint32_t filesize
Definition: hnm.c:43
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
uint32_t currentframe
Definition: hnm.c:49
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:920
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:475
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:1386
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
#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:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:764
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: avcodec.h:1454