FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rtpdec_rfc4175.c
Go to the documentation of this file.
1 /*
2  * RTP Depacketization of RAW video (TR-03)
3  * Copyright (c) 2016 Savoir-faire Linux, Inc
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /* Development sponsored by CBC/Radio-Canada */
23 
24 #include "avio_internal.h"
25 #include "rtpdec_formats.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/pixdesc.h"
28 
29 struct PayloadContext {
30  char *sampling;
31  int depth;
32  int width;
33  int height;
34 
36  unsigned int frame_size;
37  unsigned int pgroup; /* size of the pixel group in bytes */
38  unsigned int xinc;
39 
40  uint32_t timestamp;
41 };
42 
44 {
46  int bits_per_sample = 0;
47  int tag = 0;
48 
49  if (!strncmp(data->sampling, "YCbCr-4:2:2", 11)) {
50  tag = MKTAG('U', 'Y', 'V', 'Y');
51  data->xinc = 2;
52 
53  if (data->depth == 8) {
54  data->pgroup = 4;
55  bits_per_sample = 16;
56  pixfmt = AV_PIX_FMT_UYVY422;
57  } else if (data->depth == 10) {
58  data->pgroup = 5;
59  bits_per_sample = 20;
60  pixfmt = AV_PIX_FMT_YUV422P10;
61  } else {
62  return AVERROR_INVALIDDATA;
63  }
64  } else {
65  return AVERROR_INVALIDDATA;
66  }
67 
68  stream->codecpar->format = pixfmt;
69  stream->codecpar->codec_tag = tag;
70  stream->codecpar->bits_per_coded_sample = bits_per_sample;
71  data->frame_size = data->width * data->height * data->pgroup / data->xinc;
72 
73  return 0;
74 }
75 
77  PayloadContext *data, const char *attr,
78  const char *value)
79 {
80  if (!strncmp(attr, "width", 5))
81  data->width = atoi(value);
82  else if (!strncmp(attr, "height", 6))
83  data->height = atoi(value);
84  else if (!strncmp(attr, "sampling", 8))
85  data->sampling = av_strdup(value);
86  else if (!strncmp(attr, "depth", 5))
87  data->depth = atoi(value);
88 
89  return 0;
90 }
91 
92 static int rfc4175_parse_sdp_line(AVFormatContext *s, int st_index,
93  PayloadContext *data, const char *line)
94 {
95  const char *p;
96 
97  if (st_index < 0)
98  return 0;
99 
100  if (av_strstart(line, "fmtp:", &p)) {
101  AVStream *stream = s->streams[st_index];
102  int ret = ff_parse_fmtp(s, stream, data, p, rfc4175_parse_fmtp);
103 
104  if (ret < 0)
105  return ret;
106 
107 
108  if (!data->sampling || !data->depth || !data->width || !data->height)
109  return -1;
110 
111  stream->codecpar->width = data->width;
112  stream->codecpar->height = data->height;
113 
114  ret = rfc4175_parse_format(stream, data);
115  av_freep(&data->sampling);
116 
117  return ret;
118  }
119 
120  return 0;
121 }
122 
124  int stream_index)
125 {
126  int ret;
127 
128  pkt->stream_index = stream_index;
129  ret = av_packet_from_data(pkt, data->frame, data->frame_size);
130  if (ret < 0) {
131  av_freep(&data->frame);
132  }
133 
134  data->frame = NULL;
135 
136  return ret;
137 }
138 
140  AVStream *st, AVPacket *pkt, uint32_t *timestamp,
141  const uint8_t * buf, int len,
142  uint16_t seq, int flags)
143 {
144  int length, line, offset, cont;
145  const uint8_t *headers = buf + 2; /* skip extended seqnum */
146  const uint8_t *payload = buf + 2;
147  int payload_len = len - 2;
148  int missed_last_packet = 0;
149 
150  uint8_t *dest;
151 
152  if (*timestamp != data->timestamp) {
153  if (data->frame) {
154  /*
155  * if we're here, it means that two RTP packets didn't have the
156  * same timestamp, which is a sign that they were packets from two
157  * different frames, but we didn't get the flag RTP_FLAG_MARKER on
158  * the first one of these frames (last packet of a frame).
159  * Finalize the previous frame anyway by filling the AVPacket.
160  */
161  av_log(ctx, AV_LOG_ERROR, "Missed previous RTP Marker\n");
162  missed_last_packet = 1;
163  rfc4175_finalize_packet(data, pkt, st->index);
164  }
165 
166  data->frame = av_malloc(data->frame_size);
167 
168  data->timestamp = *timestamp;
169 
170  if (!data->frame) {
171  av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
172  return AVERROR(ENOMEM);
173  }
174  }
175 
176  /*
177  * looks for the 'Continuation bit' in scan lines' headers
178  * to find where data start
179  */
180  do {
181  if (payload_len < 6)
182  return AVERROR_INVALIDDATA;
183 
184  cont = payload[4] & 0x80;
185  payload += 6;
186  payload_len -= 6;
187  } while (cont);
188 
189  /* and now iterate over every scan lines */
190  do {
191  int copy_offset;
192 
193  if (payload_len < data->pgroup)
194  return AVERROR_INVALIDDATA;
195 
196  length = (headers[0] << 8) | headers[1];
197  line = ((headers[2] & 0x7f) << 8) | headers[3];
198  offset = ((headers[4] & 0x7f) << 8) | headers[5];
199  cont = headers[4] & 0x80;
200  headers += 6;
201 
202  if (length % data->pgroup)
203  return AVERROR_INVALIDDATA;
204 
205  if (length > payload_len)
206  length = payload_len;
207 
208  /* prevent ill-formed packets to write after buffer's end */
209  copy_offset = (line * data->width + offset) * data->pgroup / data->xinc;
210  if (copy_offset + length > data->frame_size)
211  return AVERROR_INVALIDDATA;
212 
213  dest = data->frame + copy_offset;
214  memcpy(dest, payload, length);
215 
216  payload += length;
217  payload_len -= length;
218  } while (cont);
219 
220  if ((flags & RTP_FLAG_MARKER)) {
221  return rfc4175_finalize_packet(data, pkt, st->index);
222  } else if (missed_last_packet) {
223  return 0;
224  }
225 
226  return AVERROR(EAGAIN);
227 }
228 
230  .enc_name = "raw",
231  .codec_type = AVMEDIA_TYPE_VIDEO,
232  .codec_id = AV_CODEC_ID_BITPACKED,
233  .priv_data_size = sizeof(PayloadContext),
234  .parse_sdp_a_line = rfc4175_parse_sdp_line,
236 };
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:77
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int rfc4175_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *data, const char *line)
RTP/JPEG specific private data.
Definition: rdt.c:83
int index
stream index in AVFormatContext
Definition: avformat.h:874
static AVPacket pkt
AVIOContext * frame
current frame buffer
Definition: rtpdec_jpeg.c:35
Format I/O context.
Definition: avformat.h:1342
static int rfc4175_parse_format(AVStream *stream, PayloadContext *data)
uint8_t * frame
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:3950
unsigned int xinc
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
Initialize a reference-counted packet from av_malloc()ed data.
Definition: avpacket.c:152
static int rfc4175_handle_packet(AVFormatContext *ctx, PayloadContext *data, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
static int flags
Definition: log.c:55
uint32_t tag
Definition: movenc.c:1455
#define av_log(a,...)
uint32_t timestamp
current frame timestamp
Definition: rtpdec_ac3.c:31
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define RTP_FLAG_MARKER
RTP marker bit was set for this packet.
Definition: rtpdec.h:93
#define AVERROR(e)
Definition: error.h:43
Definition: graph2dot.c:48
GLsizei GLsizei * length
Definition: opengl_enc.c:115
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
unsigned int frame_size
const RTPDynamicProtocolHandler ff_rfc4175_rtp_handler
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
AVFormatContext * ctx
Definition: movenc.c:48
Stream structure.
Definition: avformat.h:873
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
static int rfc4175_parse_fmtp(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *attr, const char *value)
void * buf
Definition: avisynth_c.h:690
int ff_parse_fmtp(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *p, int(*parse_fmtp)(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *attr, const char *value))
Definition: rtpdec.c:889
const char * enc_name
Definition: rtpdec.h:116
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:369
static int rfc4175_finalize_packet(PayloadContext *data, AVPacket *pkt, int stream_index)
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
if(ret< 0)
Definition: vf_mcdeint.c:279
unsigned int pgroup
static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
Parse a packet, add all split parts to parse_queue.
Definition: utils.c:1437
int len
enum AVPixelFormat pixfmt
Definition: kmsgrab.c:202
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3926
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3888
int stream_index
Definition: avcodec.h:1432
#define MKTAG(a, b, c, d)
Definition: common.h:366
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1407