libavformat/rtpdec_asf.c File Reference

Microsoft RTP/ASF support. More...

#include "libavutil/base64.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "rtp.h"
#include "rtpdec_formats.h"
#include "rtsp.h"
#include "asf.h"
#include "avio_internal.h"

Go to the source code of this file.

Data Structures
struct	PayloadContext
	RTP/H264 specific private data. More...
Defines
#define	RTP_ASF_HANDLER(n, s, t)
Functions
static int	rtp_asf_fix_header (uint8_t *buf, int len)
	From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not contain any padding.
static int	packetizer_read (void *opaque, uint8_t *buf, int buf_size)
	The following code is basically a buffered AVIOContext, with the added benefit of returning -EAGAIN (instead of 0) on packet boundaries, such that the ASF demuxer can return safely and resume business at the next packet.
static void	init_packetizer (AVIOContext *pb, uint8_t *buf, int len)
int	ff_wms_parse_sdp_a_line (AVFormatContext *s, const char *p)
	Parse a Windows Media Server-specific SDP line.
static int	asfrtp_parse_sdp_line (AVFormatContext *s, int stream_index, PayloadContext *asf, const char *line)
static int	asfrtp_parse_packet (AVFormatContext *s, PayloadContext *asf, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, int flags)
static PayloadContext *	asfrtp_new_context (void)
static void	asfrtp_free_context (PayloadContext *asf)
	RTP_ASF_HANDLER (asf_pfv,"x-asf-pf", AVMEDIA_TYPE_VIDEO)
	RTP_ASF_HANDLER (asf_pfa,"x-asf-pf", AVMEDIA_TYPE_AUDIO)

---

Detailed Description

Microsoft RTP/ASF support.

Author:

Ronald S. Bultje <rbultje@ronald.bitfreak.net>

Definition in file rtpdec_asf.c.

---

Define Documentation

#define RTP_ASF_HANDLER	(	n,
		s,
		t		)

Value:

RTPDynamicProtocolHandler ff_ms_rtp_ ## n ## _handler = { \
    .enc_name         = s, \
    .codec_type       = t, \
    .codec_id         = CODEC_ID_NONE, \
    .parse_sdp_a_line = asfrtp_parse_sdp_line, \
    .alloc            = asfrtp_new_context, \
    .free             = asfrtp_free_context, \
    .parse_packet     = asfrtp_parse_packet,   \
}

Definition at line 294 of file rtpdec_asf.c.

---

Function Documentation

static void asfrtp_free_context

(

PayloadContext *

asf

)

[static]

Definition at line 282 of file rtpdec_asf.c.

static PayloadContext* asfrtp_new_context

(

void

)

[static]

Definition at line 277 of file rtpdec_asf.c.

static int asfrtp_parse_packet	(	AVFormatContext *	s,
		PayloadContext *	asf,
		AVStream *	st,
		AVPacket *	pkt,
		uint32_t *	timestamp,
		const uint8_t *	buf,
		int	len,
		int	flags
	)			[static]

Returns:

0 when a packet was written into /p pkt, and no more data is left; 1 when a packet was written into /p pkt, and more packets might be left; <0 when not enough data was provided to return a full packet, or on error.

< relative timestamp

< has duration

< has location ID

If 0x40 is not set, the len_off field specifies an offset of this packet's payload data in the complete (reassembled) ASF packet. This is used to spread one ASF packet over multiple RTP packets.

If 0x40 is set, the len_off field specifies the length of the next ASF packet that can be read from this payload data alone. This is commonly the same as the payload size, but could be less in case of packet splitting (i.e. multiple ASF packets in one RTP packet).

Definition at line 163 of file rtpdec_asf.c.

static int asfrtp_parse_sdp_line	(	AVFormatContext *	s,
		int	stream_index,
		PayloadContext *	asf,
		const char *	line
	)			[static]

Definition at line 127 of file rtpdec_asf.c.

int ff_wms_parse_sdp_a_line	(	AVFormatContext *	s,
		const char *	p
	)

Parse a Windows Media Server-specific SDP line.

Parameters:

s

RTSP demux context

Definition at line 95 of file rtpdec_asf.c.

static void init_packetizer	(	AVIOContext *	pb,
		uint8_t *	buf,
		int	len
	)			[static]

Definition at line 86 of file rtpdec_asf.c.

Referenced by asfrtp_parse_packet(), and ff_wms_parse_sdp_a_line().

static int packetizer_read	(	void *	opaque,
		uint8_t *	buf,
		int	buf_size
	)			[static]

The following code is basically a buffered AVIOContext, with the added benefit of returning -EAGAIN (instead of 0) on packet boundaries, such that the ASF demuxer can return safely and resume business at the next packet.

Definition at line 81 of file rtpdec_asf.c.

Referenced by init_packetizer().

static int rtp_asf_fix_header	(	uint8_t *	buf,
		int	len
	)			[static]

From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not contain any padding.

Unfortunately, the header min/max_pktsize are not updated (thus making min_pktsize invalid). Here, we "fix" these faulty min_pktsize values in the ASF file header.

Returns:

0 on success, <0 on failure (currently -1).

Definition at line 44 of file rtpdec_asf.c.

Referenced by ff_wms_parse_sdp_a_line().

RTP_ASF_HANDLER	(	asf_pfa	,
		"x-asf-pf"	,
		AVMEDIA_TYPE_AUDIO
	)

RTP_ASF_HANDLER	(	asf_pfv	,
		"x-asf-pf"	,
		AVMEDIA_TYPE_VIDEO
	)