* RTP definitions
* Copyright (c) 2002 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_RTP_H
#define AVFORMAT_RTP_H
+#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
+#include "libavutil/mathematics.h"
/**
- * Return the payload type for a given codec.
+ * Return the payload type for a given stream used in the given format context.
+ * Static payload types are derived from the codec.
+ * Dynamic payload type are derived from the id field in AVStream.
+ * The format context private option payload_type overrides both.
*
+ * @param fmt The context of the format
* @param codec The context of the codec
+ * @param idx The stream index
+ * @return The payload type (the 'PT' field in the RTP header).
+ */
+int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
+ int idx);
+
+/**
+ * Initialize a codec context based on the payload type.
+ *
+ * Fill the codec_type and codec_id fields of a codec context with
+ * information depending on the payload type; for audio codecs, the
+ * channels and sample_rate fields are also filled.
+ *
+ * @param codec The context of the codec
+ * @param payload_type The payload type (the 'PT' field in the RTP header)
* @return In case of unknown payload type or dynamic payload type, a
- * negative value is returned; otherwise, the payload type (the 'PT' field
- * in the RTP header) is returned.
+ * negative value is returned; otherwise, 0 is returned
*/
-int ff_rtp_get_payload_type(AVCodecContext *codec);
+int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
-int rtp_get_codec_info(AVCodecContext *codec, int payload_type);
+/**
+ * Return the encoding name (as defined in
+ * http://www.iana.org/assignments/rtp-parameters) for a given payload type.
+ *
+ * @param payload_type The payload type (the 'PT' field in the RTP header)
+ * @return In case of unknown payload type or dynamic payload type, a pointer
+ * to an empty string is returned; otherwise, a pointer to a string containing
+ * the encoding name is returned
+ */
const char *ff_rtp_enc_name(int payload_type);
-enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type);
+
+/**
+ * Return the codec id for the given encoding name and codec type.
+ *
+ * @param buf A pointer to the string containing the encoding name
+ * @param codec_type The codec type
+ * @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned;
+ * otherwise, the codec id is returned
+ */
+enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
#define RTP_PT_PRIVATE 96
#define RTP_VERSION 2
#define RTP_MAX_SDES 256 /**< maximum text length for SDES */
-/* RTCP paquets use 0.5 % of the bandwidth */
+/* RTCP packets use 0.5% of the bandwidth */
#define RTCP_TX_RATIO_NUM 5
#define RTCP_TX_RATIO_DEN 1000
+/* An arbitrary id value for RTP Xiph streams - only relevant to indicate
+ * that the configuration has changed within a stream (by changing the
+ * ident value sent).
+ */
+#define RTP_XIPH_IDENT 0xfecdba
+
+/* RTCP packet types */
+enum RTCPType {
+ RTCP_FIR = 192,
+ RTCP_NACK, // 193
+ RTCP_SMPTETC,// 194
+ RTCP_IJ, // 195
+ RTCP_SR = 200,
+ RTCP_RR, // 201
+ RTCP_SDES, // 202
+ RTCP_BYE, // 203
+ RTCP_APP, // 204
+ RTCP_RTPFB,// 205
+ RTCP_PSFB, // 206
+ RTCP_XR, // 207
+ RTCP_AVB, // 208
+ RTCP_RSI, // 209
+ RTCP_TOKEN,// 210
+};
+
+#define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
+ ((x) >= RTCP_SR && (x) <= RTCP_TOKEN))
+
+#define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000)
+
#endif /* AVFORMAT_RTP_H */
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