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rtpdec_mpegts.c
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1 /*
2  * RTP MPEG2TS depacketizer
3  * Copyright (c) 2003 Fabrice Bellard
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 #include "libavutil/attributes.h"
23 #include "mpegts.h"
24 #include "rtpdec_formats.h"
25 
26 struct PayloadContext {
27  struct MpegTSContext *ts;
31 };
32 
34 {
35  if (!data)
36  return;
37  if (data->ts)
39 }
40 
41 static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
43 {
44  data->ts = avpriv_mpegts_parse_open(ctx);
45  if (!data->ts)
46  return AVERROR(ENOMEM);
47  return 0;
48 }
49 
51  AVStream *st, AVPacket *pkt, uint32_t *timestamp,
52  const uint8_t *buf, int len, uint16_t seq,
53  int flags)
54 {
55  int ret;
56 
57  // We don't want to use the RTP timestamps at all. If the mpegts demuxer
58  // doesn't set any pts/dts, the generic rtpdec code shouldn't try to
59  // fill it in either, since the mpegts and RTP timestamps are in totally
60  // different ranges.
61  *timestamp = RTP_NOTS_VALUE;
62 
63  if (!buf) {
64  if (data->read_buf_index >= data->read_buf_size)
65  return AVERROR(EAGAIN);
66  ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
67  data->read_buf_size - data->read_buf_index);
68  if (ret < 0)
69  return AVERROR(EAGAIN);
70  data->read_buf_index += ret;
71  if (data->read_buf_index < data->read_buf_size)
72  return 1;
73  else
74  return 0;
75  }
76 
77  ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len);
78  /* The only error that can be returned from avpriv_mpegts_parse_packet
79  * is "no more data to return from the provided buffer", so return
80  * AVERROR(EAGAIN) for all errors */
81  if (ret < 0)
82  return AVERROR(EAGAIN);
83  if (ret < len) {
84  data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
85  memcpy(data->buf, buf + ret, data->read_buf_size);
86  data->read_buf_index = 0;
87  return 1;
88  }
89  return 0;
90 }
91 
94  .priv_data_size = sizeof(PayloadContext),
96  .init = mpegts_init,
97  .close = mpegts_close_context,
98  .static_payload_id = 33,
99 };
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:36
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
Definition: rtpdec_mpegts.c:50
struct MpegTSContext * ts
Definition: rtpdec_mpegts.c:27
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
RTP/JPEG specific private data.
Definition: rdt.c:83
MpegTSContext * avpriv_mpegts_parse_open(AVFormatContext *s)
Definition: mpegts.c:2876
static AVPacket pkt
enum AVMediaType codec_type
Definition: rtpdec.h:117
Macro definitions for various function/variable attributes.
Format I/O context.
Definition: avformat.h:1338
uint8_t
#define av_cold
Definition: attributes.h:82
Opaque data information usually continuous.
Definition: avutil.h:197
#define AVERROR(e)
Definition: error.h:43
#define FFMIN(a, b)
Definition: common.h:96
AVFormatContext * ctx
Definition: movenc.c:48
Stream structure.
Definition: avformat.h:889
static av_cold int mpegts_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
Definition: rtpdec_mpegts.c:41
void * buf
Definition: avisynth_c.h:690
uint8_t * buf
the temporary storage buffer
Definition: rtpdec_asf.c:183
int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, const uint8_t *buf, int len)
Definition: mpegts.c:2895
static int flags
Definition: cpu.c:47
RTPDynamicProtocolHandler ff_mpegts_dynamic_handler
Definition: rtpdec_mpegts.c:92
static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
Parse a packet, add all split parts to parse_queue.
Definition: utils.c:1368
int len
static void mpegts_close_context(PayloadContext *data)
Definition: rtpdec_mpegts.c:33
#define RTP_NOTS_VALUE
Definition: rtpdec.h:40
void avpriv_mpegts_parse_close(MpegTSContext *ts)
Definition: mpegts.c:2920
This structure stores compressed data.
Definition: avcodec.h:1578