Libav
rtpdec_svq3.c
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1 /*
2  * Sorenson-3 (SVQ3/SV3V) payload for RTP
3  * Copyright (c) 2010 Ronald S. Bultje
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 
29 #include <string.h>
30 #include "libavutil/intreadwrite.h"
31 #include "rtp.h"
32 #include "rtpdec.h"
33 #include "rtpdec_formats.h"
34 
35 struct PayloadContext {
37  int64_t timestamp;
38 };
39 
42  AVStream *st, AVPacket *pkt,
43  uint32_t *timestamp,
44  const uint8_t *buf, int len, uint16_t seq,
45  int flags)
46 {
47  int config_packet, start_packet, end_packet;
48 
49  if (len < 2)
50  return AVERROR_INVALIDDATA;
51 
52  config_packet = buf[0] & 0x40;
53  start_packet = buf[0] & 0x20;
54  end_packet = buf[0] & 0x10;
55  buf += 2; // ignore buf[1]
56  len -= 2;
57 
58  if (config_packet) {
59 
60  av_freep(&st->codec->extradata);
61  st->codec->extradata_size = 0;
62 
63  if (len < 2 || !(st->codec->extradata =
65  return AVERROR_INVALIDDATA;
66 
67  st->codec->extradata_size = len + 8;
68  memcpy(st->codec->extradata, "SEQH", 4);
69  AV_WB32(st->codec->extradata + 4, len);
70  memcpy(st->codec->extradata + 8, buf, len);
71 
72  /* We set codec_id to AV_CODEC_ID_NONE initially to
73  * delay decoder initialization since extradata is
74  * carried within the RTP stream, not SDP. Here,
75  * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
76  * to the decoder that it is OK to initialize. */
78 
79  return AVERROR(EAGAIN);
80  }
81 
82  if (start_packet) {
83  int res;
84 
85  if (sv->pktbuf) {
86  uint8_t *tmp;
87  avio_close_dyn_buf(sv->pktbuf, &tmp);
88  av_free(tmp);
89  }
90  if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
91  return res;
92  sv->timestamp = *timestamp;
93  }
94 
95  if (!sv->pktbuf)
96  return AVERROR_INVALIDDATA;
97 
98  avio_write(sv->pktbuf, buf, len);
99 
100  if (end_packet) {
101  int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
102  if (ret < 0)
103  return ret;
104 
105  *timestamp = sv->timestamp;
106  return 0;
107  }
108 
109  return AVERROR(EAGAIN);
110 }
111 
113 {
114  return av_mallocz(sizeof(PayloadContext));
115 }
116 
118 {
119  if (sv->pktbuf) {
120  uint8_t *buf;
121  avio_close_dyn_buf(sv->pktbuf, &buf);
122  av_free(buf);
123  }
124  av_free(sv);
125 }
126 
128  .enc_name = "X-SV3V-ES",
129  .codec_type = AVMEDIA_TYPE_VIDEO,
130  .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
131  .alloc = svq3_extradata_new,
132  .free = svq3_extradata_free,
133  .parse_packet = svq3_parse_packet,
134 };
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static int svq3_parse_packet(AVFormatContext *s, PayloadContext *sv, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
return 0 on packet, <0 on partial packet or error...
Definition: rtpdec_svq3.c:41
RTP/JPEG specific private data.
Definition: rdt.c:83
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int index
stream index in AVFormatContext
Definition: avformat.h:700
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
void av_freep(void *ptr)
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
uint8_t
static void svq3_extradata_free(PayloadContext *sv)
Definition: rtpdec_svq3.c:117
static int flags
Definition: log.c:44
#define AV_WB32(p, d)
Definition: intreadwrite.h:239
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:966
uint32_t timestamp
current frame timestamp
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
#define AVERROR(e)
Definition: error.h:43
AVIOContext * pktbuf
Definition: rtpdec_asf.c:161
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
int64_t timestamp
Definition: rtpdec_svq3.c:37
void * av_malloc(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Stream structure.
Definition: avformat.h:699
enum AVCodecID codec_id
Definition: avcodec.h:1067
int extradata_size
Definition: avcodec.h:1165
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:954
const char enc_name[50]
Definition: rtpdec.h:116
RTPDynamicProtocolHandler ff_svq3_dynamic_handler
Definition: rtpdec_svq3.c:127
int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx)
Close the dynamic buffer and make a packet from it.
Definition: rtpdec.c:867
int len
This structure stores compressed data.
Definition: avcodec.h:950
static PayloadContext * svq3_extradata_new(void)
Definition: rtpdec_svq3.c:112
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205