Libav
nuv.c
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1 /*
2  * NuppelVideo demuxer.
3  * Copyright (c) 2006 Reimar Doeffinger
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29 
30 static const AVCodecTag nuv_audio_tags[] = {
31  { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
32  { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
33  { AV_CODEC_ID_NONE, 0 },
34 };
35 
36 typedef struct NUVContext {
37  int v_id;
38  int a_id;
40 } NUVContext;
41 
42 typedef enum {
43  NUV_VIDEO = 'V',
45  NUV_AUDIO = 'A',
46  NUV_SEEKP = 'R',
49 
50 static int nuv_probe(AVProbeData *p)
51 {
52  if (!memcmp(p->buf, "NuppelVideo", 12))
53  return AVPROBE_SCORE_MAX;
54  if (!memcmp(p->buf, "MythTVVideo", 12))
55  return AVPROBE_SCORE_MAX;
56  return 0;
57 }
58 
60 #define PKTSIZE(s) (s & 0xffffff)
61 
69 static int get_codec_data(AVIOContext *pb, AVStream *vst,
70  AVStream *ast, int myth)
71 {
72  nuv_frametype frametype;
73 
74  if (!vst && !myth)
75  return 1; // no codec data needed
76  while (!pb->eof_reached) {
77  int size, subtype;
78 
79  frametype = avio_r8(pb);
80  switch (frametype) {
81  case NUV_EXTRADATA:
82  subtype = avio_r8(pb);
83  avio_skip(pb, 6);
84  size = PKTSIZE(avio_rl32(pb));
85  if (vst && subtype == 'R') {
86  if (vst->codecpar->extradata) {
87  av_freep(&vst->codecpar->extradata);
88  vst->codecpar->extradata_size = 0;
89  }
90  vst->codecpar->extradata = av_malloc(size);
91  if (!vst->codecpar->extradata)
92  return AVERROR(ENOMEM);
94  avio_read(pb, vst->codecpar->extradata, size);
95  size = 0;
96  if (!myth)
97  return 0;
98  }
99  break;
100  case NUV_MYTHEXT:
101  avio_skip(pb, 7);
102  size = PKTSIZE(avio_rl32(pb));
103  if (size != 128 * 4)
104  break;
105  avio_rl32(pb); // version
106  if (vst) {
107  vst->codecpar->codec_tag = avio_rl32(pb);
108  vst->codecpar->codec_id =
110  if (vst->codecpar->codec_tag == MKTAG('R', 'J', 'P', 'G'))
112  } else
113  avio_skip(pb, 4);
114 
115  if (ast) {
116  int id;
117 
118  ast->codecpar->codec_tag = avio_rl32(pb);
119  ast->codecpar->sample_rate = avio_rl32(pb);
121  ast->codecpar->channels = avio_rl32(pb);
122  ast->codecpar->channel_layout = 0;
123 
126  if (id == AV_CODEC_ID_NONE) {
127  id = ff_codec_get_id(nuv_audio_tags, ast->codecpar->codec_tag);
128  if (id == AV_CODEC_ID_PCM_S16LE)
130  0, 0, ~1);
131  }
132  ast->codecpar->codec_id = id;
133 
135  } else
136  avio_skip(pb, 4 * 4);
137 
138  size -= 6 * 4;
139  avio_skip(pb, size);
140  return 0;
141  case NUV_SEEKP:
142  size = 11;
143  break;
144  default:
145  avio_skip(pb, 7);
146  size = PKTSIZE(avio_rl32(pb));
147  break;
148  }
149  avio_skip(pb, size);
150  }
151 
152  return 0;
153 }
154 
156 {
157  NUVContext *ctx = s->priv_data;
158  AVIOContext *pb = s->pb;
159  char id_string[12];
160  double aspect, fps;
161  int is_mythtv, width, height, v_packs, a_packs, ret;
162  AVStream *vst = NULL, *ast = NULL;
163 
164  avio_read(pb, id_string, 12);
165  is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
166  avio_skip(pb, 5); // version string
167  avio_skip(pb, 3); // padding
168  width = avio_rl32(pb);
169  height = avio_rl32(pb);
170  avio_rl32(pb); // unused, "desiredwidth"
171  avio_rl32(pb); // unused, "desiredheight"
172  avio_r8(pb); // 'P' == progressive, 'I' == interlaced
173  avio_skip(pb, 3); // padding
174  aspect = av_int2double(avio_rl64(pb));
175  if (aspect > 0.9999 && aspect < 1.0001)
176  aspect = 4.0 / 3.0;
177  fps = av_int2double(avio_rl64(pb));
178  if (fps < 0.0f) {
179  if (s->error_recognition & AV_EF_EXPLODE) {
180  av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
181  return AVERROR_INVALIDDATA;
182  } else {
183  av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
184  fps = 0.0f;
185  }
186  }
187 
188  // number of packets per stream type, -1 means unknown, e.g. streaming
189  v_packs = avio_rl32(pb);
190  a_packs = avio_rl32(pb);
191  avio_rl32(pb); // text
192 
193  avio_rl32(pb); // keyframe distance (?)
194 
195  if (v_packs) {
196  vst = avformat_new_stream(s, NULL);
197  if (!vst)
198  return AVERROR(ENOMEM);
199  ctx->v_id = vst->index;
200 
201  ret = av_image_check_size(width, height, 0, s);
202  if (ret < 0)
203  return ret;
204 
207  vst->codecpar->width = width;
208  vst->codecpar->height = height;
209  vst->codecpar->bits_per_coded_sample = 10;
210  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
211  10000);
212  vst->avg_frame_rate = av_d2q(fps, 60000);
213  avpriv_set_pts_info(vst, 32, 1, 1000);
214  } else
215  ctx->v_id = -1;
216 
217  if (a_packs) {
218  ast = avformat_new_stream(s, NULL);
219  if (!ast)
220  return AVERROR(ENOMEM);
221  ctx->a_id = ast->index;
222 
223  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
224  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
225  ast->codecpar->channels = 2;
226  ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
227  ast->codecpar->sample_rate = 44100;
228  ast->codecpar->bit_rate = 2 * 2 * 44100 * 8;
229  ast->codecpar->block_align = 2 * 2;
230  ast->codecpar->bits_per_coded_sample = 16;
231  avpriv_set_pts_info(ast, 32, 1, 1000);
232  } else
233  ctx->a_id = -1;
234 
235  if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
236  return ret;
237 
238  ctx->rtjpg_video = vst && vst->codecpar->codec_id == AV_CODEC_ID_NUV;
239 
240  return 0;
241 }
242 
243 #define HDRSIZE 12
244 
245 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
246 {
247  NUVContext *ctx = s->priv_data;
248  AVIOContext *pb = s->pb;
249  uint8_t hdr[HDRSIZE];
250  nuv_frametype frametype;
251  int ret, size;
252 
253  while (!pb->eof_reached) {
254  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
255  uint64_t pos = avio_tell(pb);
256 
257  ret = avio_read(pb, hdr, HDRSIZE);
258  if (ret < HDRSIZE)
259  return ret < 0 ? ret : AVERROR(EIO);
260 
261  frametype = hdr[0];
262  size = PKTSIZE(AV_RL32(&hdr[8]));
263 
264  switch (frametype) {
265  case NUV_EXTRADATA:
266  if (!ctx->rtjpg_video) {
267  avio_skip(pb, size);
268  break;
269  }
270  case NUV_VIDEO:
271  if (ctx->v_id < 0) {
272  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
273  avio_skip(pb, size);
274  break;
275  }
276  ret = av_new_packet(pkt, copyhdrsize + size);
277  if (ret < 0)
278  return ret;
279  // HACK: we have no idea if it is a keyframe,
280  // but if we mark none seeking will not work at all.
281  pkt->flags |= AV_PKT_FLAG_KEY;
282  pkt->pos = pos;
283  pkt->pts = AV_RL32(&hdr[4]);
284  pkt->stream_index = ctx->v_id;
285  memcpy(pkt->data, hdr, copyhdrsize);
286  ret = avio_read(pb, pkt->data + copyhdrsize, size);
287  if (ret < 0) {
288  av_packet_unref(pkt);
289  return ret;
290  }
291  if (ret < size)
292  av_shrink_packet(pkt, copyhdrsize + ret);
293  return 0;
294  case NUV_AUDIO:
295  if (ctx->a_id < 0) {
296  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
297  avio_skip(pb, size);
298  break;
299  }
300  ret = av_get_packet(pb, pkt, size);
301  pkt->flags |= AV_PKT_FLAG_KEY;
302  pkt->pos = pos;
303  pkt->pts = AV_RL32(&hdr[4]);
304  pkt->stream_index = ctx->a_id;
305  if (ret < 0)
306  return ret;
307  return 0;
308  case NUV_SEEKP:
309  // contains no data, size value is invalid
310  break;
311  default:
312  avio_skip(pb, size);
313  break;
314  }
315  }
316 
317  return AVERROR(EIO);
318 }
319 
321  .name = "nuv",
322  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
323  .priv_data_size = sizeof(NUVContext),
328 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Bytestream IO Context.
Definition: avio.h:104
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
enum AVCodecID id
Definition: mxfenc.c:85
Definition: nuv.c:36
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1983
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1366
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:99
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:2986
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3483
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:770
int index
stream index in AVFormatContext
Definition: avformat.h:706
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define AV_CH_LAYOUT_STEREO
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
Format I/O context.
Definition: avformat.h:940
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
int width
Video only.
Definition: avcodec.h:3525
enum AVStreamParseType need_parsing
Definition: avformat.h:879
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2648
uint8_t * data
Definition: avcodec.h:1346
static int flags
Definition: log.c:50
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:117
static int get_codec_data(AVIOContext *pb, AVStream *vst, AVStream *ast, int myth)
read until we found all data needed for decoding
Definition: nuv.c:69
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:295
nuv_frametype
Definition: nuv.c:42
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3556
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1378
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:84
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:665
#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:148
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:479
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:50
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:781
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1352
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3501
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:536
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:400
int v_id
Definition: nuv.c:37
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:223
audio channel layout utility functions
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:105
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:29
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:286
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
AVFormatContext * ctx
Definition: movenc.c:48
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
Definition: avcodec.h:2681
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:320
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:546
Stream structure.
Definition: avformat.h:705
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:60
NULL
Definition: eval.c:55
#define HDRSIZE
Definition: nuv.c:243
static int width
Definition: utils.c:156
AVIOContext * pb
I/O context.
Definition: avformat.h:982
int a_id
Definition: nuv.c:38
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:347
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:421
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:1995
int rtjpg_video
Definition: nuv.c:39
This structure contains the data a format has to probe a file.
Definition: avformat.h:398
Definition: nuv.c:46
int height
Definition: gxfenc.c:72
int sample_rate
Audio only.
Definition: avcodec.h:3564
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:407
full parsing and repack
Definition: avformat.h:657
Main libavformat public API header.
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:166
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1170
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:245
Definition: nuv.c:45
int eof_reached
true if eof reached
Definition: avio.h:132
void * priv_data
Format private data.
Definition: avformat.h:968
int bits_per_coded_sample
Definition: avcodec.h:3514
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3497
int channels
Audio only.
Definition: avcodec.h:3560
Definition: nuv.c:43
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:155
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:529
AVCodecParameters * codecpar
Definition: avformat.h:831
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3487
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:30
int stream_index
Definition: avcodec.h:1348
#define MKTAG(a, b, c, d)
Definition: common.h:256
This structure stores compressed data.
Definition: avcodec.h:1323
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:673
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1339