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/intreadwrite.h"
24 #include "libavutil/intfloat.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "riff.h"
28 
29 static const AVCodecTag nuv_audio_tags[] = {
30  { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
31  { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
32  { AV_CODEC_ID_NONE, 0 },
33 };
34 
35 typedef struct {
36  int v_id;
37  int a_id;
39 } NUVContext;
40 
41 typedef enum {
42  NUV_VIDEO = 'V',
44  NUV_AUDIO = 'A',
45  NUV_SEEKP = 'R',
48 
49 static int nuv_probe(AVProbeData *p)
50 {
51  if (!memcmp(p->buf, "NuppelVideo", 12))
52  return AVPROBE_SCORE_MAX;
53  if (!memcmp(p->buf, "MythTVVideo", 12))
54  return AVPROBE_SCORE_MAX;
55  return 0;
56 }
57 
59 #define PKTSIZE(s) (s & 0xffffff)
60 
68 static int get_codec_data(AVIOContext *pb, AVStream *vst,
69  AVStream *ast, int myth)
70 {
71  nuv_frametype frametype;
72 
73  if (!vst && !myth)
74  return 1; // no codec data needed
75  while (!pb->eof_reached) {
76  int size, subtype;
77 
78  frametype = avio_r8(pb);
79  switch (frametype) {
80  case NUV_EXTRADATA:
81  subtype = avio_r8(pb);
82  avio_skip(pb, 6);
83  size = PKTSIZE(avio_rl32(pb));
84  if (vst && subtype == 'R') {
85  if (vst->codec->extradata) {
86  av_freep(&vst->codec->extradata);
87  vst->codec->extradata_size = 0;
88  }
89  vst->codec->extradata = av_malloc(size);
90  if (!vst->codec->extradata)
91  return AVERROR(ENOMEM);
92  vst->codec->extradata_size = size;
93  avio_read(pb, vst->codec->extradata, size);
94  size = 0;
95  if (!myth)
96  return 0;
97  }
98  break;
99  case NUV_MYTHEXT:
100  avio_skip(pb, 7);
101  size = PKTSIZE(avio_rl32(pb));
102  if (size != 128 * 4)
103  break;
104  avio_rl32(pb); // version
105  if (vst) {
106  vst->codec->codec_tag = avio_rl32(pb);
107  vst->codec->codec_id =
109  if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
111  } else
112  avio_skip(pb, 4);
113 
114  if (ast) {
115  int id;
116 
117  ast->codec->codec_tag = avio_rl32(pb);
118  ast->codec->sample_rate = avio_rl32(pb);
120  ast->codec->channels = avio_rl32(pb);
121  ast->codec->channel_layout = 0;
122 
125  if (id == AV_CODEC_ID_NONE) {
126  id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
127  if (id == AV_CODEC_ID_PCM_S16LE)
129  0, 0, ~1);
130  }
131  ast->codec->codec_id = id;
132 
134  } else
135  avio_skip(pb, 4 * 4);
136 
137  size -= 6 * 4;
138  avio_skip(pb, size);
139  return 0;
140  case NUV_SEEKP:
141  size = 11;
142  break;
143  default:
144  avio_skip(pb, 7);
145  size = PKTSIZE(avio_rl32(pb));
146  break;
147  }
148  avio_skip(pb, size);
149  }
150 
151  return 0;
152 }
153 
155 {
156  NUVContext *ctx = s->priv_data;
157  AVIOContext *pb = s->pb;
158  char id_string[12];
159  double aspect, fps;
160  int is_mythtv, width, height, v_packs, a_packs, ret;
161  AVStream *vst = NULL, *ast = NULL;
162 
163  avio_read(pb, id_string, 12);
164  is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
165  avio_skip(pb, 5); // version string
166  avio_skip(pb, 3); // padding
167  width = avio_rl32(pb);
168  height = avio_rl32(pb);
169  avio_rl32(pb); // unused, "desiredwidth"
170  avio_rl32(pb); // unused, "desiredheight"
171  avio_r8(pb); // 'P' == progressive, 'I' == interlaced
172  avio_skip(pb, 3); // padding
173  aspect = av_int2double(avio_rl64(pb));
174  if (aspect > 0.9999 && aspect < 1.0001)
175  aspect = 4.0 / 3.0;
176  fps = av_int2double(avio_rl64(pb));
177 
178  // number of packets per stream type, -1 means unknown, e.g. streaming
179  v_packs = avio_rl32(pb);
180  a_packs = avio_rl32(pb);
181  avio_rl32(pb); // text
182 
183  avio_rl32(pb); // keyframe distance (?)
184 
185  if (v_packs) {
186  vst = avformat_new_stream(s, NULL);
187  if (!vst)
188  return AVERROR(ENOMEM);
189  ctx->v_id = vst->index;
190 
193  vst->codec->width = width;
194  vst->codec->height = height;
195  vst->codec->bits_per_coded_sample = 10;
196  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
197  10000);
198  vst->avg_frame_rate = av_d2q(fps, 60000);
199  avpriv_set_pts_info(vst, 32, 1, 1000);
200  } else
201  ctx->v_id = -1;
202 
203  if (a_packs) {
204  ast = avformat_new_stream(s, NULL);
205  if (!ast)
206  return AVERROR(ENOMEM);
207  ctx->a_id = ast->index;
208 
209  ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
210  ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
211  ast->codec->channels = 2;
212  ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
213  ast->codec->sample_rate = 44100;
214  ast->codec->bit_rate = 2 * 2 * 44100 * 8;
215  ast->codec->block_align = 2 * 2;
216  ast->codec->bits_per_coded_sample = 16;
217  avpriv_set_pts_info(ast, 32, 1, 1000);
218  } else
219  ctx->a_id = -1;
220 
221  if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
222  return ret;
223 
224  ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
225 
226  return 0;
227 }
228 
229 #define HDRSIZE 12
230 
231 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
232 {
233  NUVContext *ctx = s->priv_data;
234  AVIOContext *pb = s->pb;
235  uint8_t hdr[HDRSIZE];
236  nuv_frametype frametype;
237  int ret, size;
238 
239  while (!pb->eof_reached) {
240  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
241  uint64_t pos = avio_tell(pb);
242 
243  ret = avio_read(pb, hdr, HDRSIZE);
244  if (ret < HDRSIZE)
245  return ret < 0 ? ret : AVERROR(EIO);
246 
247  frametype = hdr[0];
248  size = PKTSIZE(AV_RL32(&hdr[8]));
249 
250  switch (frametype) {
251  case NUV_EXTRADATA:
252  if (!ctx->rtjpg_video) {
253  avio_skip(pb, size);
254  break;
255  }
256  case NUV_VIDEO:
257  if (ctx->v_id < 0) {
258  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
259  avio_skip(pb, size);
260  break;
261  }
262  ret = av_new_packet(pkt, copyhdrsize + size);
263  if (ret < 0)
264  return ret;
265  // HACK: we have no idea if it is a keyframe,
266  // but if we mark none seeking will not work at all.
267  pkt->flags |= AV_PKT_FLAG_KEY;
268  pkt->pos = pos;
269  pkt->pts = AV_RL32(&hdr[4]);
270  pkt->stream_index = ctx->v_id;
271  memcpy(pkt->data, hdr, copyhdrsize);
272  ret = avio_read(pb, pkt->data + copyhdrsize, size);
273  if (ret < 0) {
274  av_free_packet(pkt);
275  return ret;
276  }
277  if (ret < size)
278  av_shrink_packet(pkt, copyhdrsize + ret);
279  return 0;
280  case NUV_AUDIO:
281  if (ctx->a_id < 0) {
282  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
283  avio_skip(pb, size);
284  break;
285  }
286  ret = av_get_packet(pb, pkt, size);
287  pkt->flags |= AV_PKT_FLAG_KEY;
288  pkt->pos = pos;
289  pkt->pts = AV_RL32(&hdr[4]);
290  pkt->stream_index = ctx->a_id;
291  if (ret < 0)
292  return ret;
293  return 0;
294  case NUV_SEEKP:
295  // contains no data, size value is invalid
296  break;
297  default:
298  avio_skip(pb, size);
299  break;
300  }
301  }
302 
303  return AVERROR(EIO);
304 }
305 
307  .name = "nuv",
308  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
309  .priv_data_size = sizeof(NUVContext),
314 };
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:68
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
enum AVCodecID id
Definition: mxfenc.c:84
Definition: nuv.c:35
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1922
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:992
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
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:2800
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:769
int index
stream index in AVFormatContext
Definition: avformat.h:700
#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:198
Format I/O context.
Definition: avformat.h:922
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
enum AVStreamParseType need_parsing
Definition: avformat.h:867
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1158
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2497
uint8_t * data
Definition: avcodec.h:967
static int flags
Definition: log.c:44
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:68
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2501
nuv_frametype
Definition: nuv.c:41
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1013
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:81
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
#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:150
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:379
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:49
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:780
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:973
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1846
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:443
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:397
int v_id
Definition: nuv.c:36
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
int width
picture width / height.
Definition: avcodec.h:1218
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
#define AV_RL32
Definition: intreadwrite.h:146
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:306
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
Stream structure.
Definition: avformat.h:699
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:59
NULL
Definition: eval.c:55
#define HDRSIZE
Definition: nuv.c:229
static int width
Definition: utils.c:156
enum AVMediaType codec_type
Definition: avcodec.h:1052
enum AVCodecID codec_id
Definition: avcodec.h:1061
int sample_rate
samples per second
Definition: avcodec.h:1785
AVIOContext * pb
I/O context.
Definition: avformat.h:964
int a_id
Definition: nuv.c:37
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1076
int extradata_size
Definition: avcodec.h:1159
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:417
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:1934
int rtjpg_video
Definition: nuv.c:38
This structure contains the data a format has to probe a file.
Definition: avformat.h:395
Definition: nuv.c:45
int height
Definition: gxfenc.c:72
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:404
full parsing and repack
Definition: avformat.h:653
Main libavformat public API header.
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:141
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:231
Definition: nuv.c:44
int eof_reached
true if eof reached
Definition: avio.h:96
int channels
number of audio channels
Definition: avcodec.h:1786
void * priv_data
Format private data.
Definition: avformat.h:950
Definition: nuv.c:42
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:154
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:29
int stream_index
Definition: avcodec.h:969
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:944
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:572
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:960