122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
/// RFC6416 RTP Payload Format for MPEG-4 Audio/Visual Streams
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///
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/// 5.1. Use of RTP Header Fields for MPEG-4 Visual (p9)
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/// Marker (M) bit: The marker bit is set to 1 to indicate the last RTP
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/// packet(or only RTP packet) of a VOP.When multiple VOPs are carried
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/// in the same RTP packet, the marker bit is set to 1.
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///
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/// 5.2. Fragmentation of MPEG-4 Visual Bitstream
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/// A fragmented MPEG-4 Visual bitstream is mapped directly onto the RTP
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/// payload without any addition of extra header fields or any removal of
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/// Visual syntax elements.
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///
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/// 6.2. Use of RTP Header Fields for MPEG-4 Audio (p16)
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/// Marker (M) bit: The marker bit indicates audioMuxElement boundaries.
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/// It is set to 1 to indicate that the RTP packet contains a complete
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/// audioMuxElement or the last fragment of an audioMuxElement
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///
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/// 6.3. Fragmentation of MPEG-4 Audio Bitstream
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/// It is RECOMMENDED to put one audioMuxElement in each RTP packet.
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#include "rtp-packet.h"
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#include "rtp-profile.h"
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#include "rtp-payload-internal.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#define KHz 90 // 90000Hz
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struct rtp_encode_mp4v_es_t
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{
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struct rtp_packet_t pkt;
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struct rtp_payload_t handler;
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void* cbparam;
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int size;
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};
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static void* rtp_mp4v_es_encode_create(int size, uint8_t pt, uint16_t seq, uint32_t ssrc, struct rtp_payload_t *handler, void* cbparam)
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{
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struct rtp_encode_mp4v_es_t *packer;
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packer = (struct rtp_encode_mp4v_es_t *)calloc(1, sizeof(*packer));
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if (!packer) return NULL;
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memcpy(&packer->handler, handler, sizeof(packer->handler));
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packer->cbparam = cbparam;
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packer->size = size;
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packer->pkt.rtp.v = RTP_VERSION;
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packer->pkt.rtp.pt = pt;
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packer->pkt.rtp.seq = seq;
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packer->pkt.rtp.ssrc = ssrc;
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return packer;
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}
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static void rtp_mp4v_es_encode_destroy(void* pack)
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{
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struct rtp_encode_mp4v_es_t *packer;
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packer = (struct rtp_encode_mp4v_es_t *)pack;
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#if defined(_DEBUG) || defined(DEBUG)
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memset(packer, 0xCC, sizeof(*packer));
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#endif
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free(packer);
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}
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static void rtp_mp4v_es_encode_get_info(void* pack, uint16_t* seq, uint32_t* timestamp)
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{
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struct rtp_encode_mp4v_es_t *packer;
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packer = (struct rtp_encode_mp4v_es_t *)pack;
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*seq = (uint16_t)packer->pkt.rtp.seq;
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*timestamp = packer->pkt.rtp.timestamp;
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}
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static int rtp_mp4v_es_encode_input(void* pack, const void* data, int bytes, uint32_t timestamp)
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{
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int r, n;
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uint8_t *rtp;
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const uint8_t *ptr;
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struct rtp_encode_mp4v_es_t *packer;
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packer = (struct rtp_encode_mp4v_es_t *)pack;
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assert(packer->pkt.rtp.timestamp != timestamp || !packer->pkt.payload /*first packet*/);
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packer->pkt.rtp.timestamp = timestamp; //(uint32_t)(time * KHz);
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r = 0;
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for (ptr = (const uint8_t *)data; 0 == r && bytes > 0; ++packer->pkt.rtp.seq)
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{
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packer->pkt.payload = ptr;
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packer->pkt.payloadlen = (bytes + RTP_FIXED_HEADER) <= packer->size ? bytes : (packer->size - RTP_FIXED_HEADER);
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ptr += packer->pkt.payloadlen;
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bytes -= packer->pkt.payloadlen;
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n = RTP_FIXED_HEADER + packer->pkt.payloadlen;
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rtp = (uint8_t*)packer->handler.alloc(packer->cbparam, n);
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if (!rtp) return -ENOMEM;
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packer->pkt.rtp.m = (0 == bytes) ? 1 : 0;
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n = rtp_packet_serialize(&packer->pkt, rtp, n);
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if (n != RTP_FIXED_HEADER + packer->pkt.payloadlen)
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{
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assert(0);
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return -1;
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}
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r = packer->handler.packet(packer->cbparam, rtp, n, packer->pkt.rtp.timestamp, 0);
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packer->handler.free(packer->cbparam, rtp);
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}
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return r;
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}
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struct rtp_payload_encode_t *rtp_mp4v_es_encode()
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{
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static struct rtp_payload_encode_t encode = {
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rtp_mp4v_es_encode_create,
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rtp_mp4v_es_encode_destroy,
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rtp_mp4v_es_encode_get_info,
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rtp_mp4v_es_encode_input,
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};
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return &encode;
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}
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