105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
// RFC3551 RTP Profile for Audio and Video Conferences with Minimal Control
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#include "rtp-packet.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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struct rtp_packer_t
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{
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struct rtp_payload_t handler;
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void* cbparam;
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struct rtp_packet_t pkt;
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int size;
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};
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static void* rtp_pack_create(int size, uint8_t pt, uint16_t seq, uint32_t ssrc, struct rtp_payload_t *handler, void* param)
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{
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struct rtp_packer_t *packer;
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packer = (struct rtp_packer_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 = param;
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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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void rtp_pack_destroy(void* p)
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{
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struct rtp_packer_t *packer;
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packer = (struct rtp_packer_t *)p;
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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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void rtp_pack_get_info(void* p, uint16_t* seq, uint32_t* timestamp)
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{
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struct rtp_packer_t *packer;
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packer = (struct rtp_packer_t *)p;
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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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int rtp_pack_input(void* p, 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_packer_t *packer;
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r = 0;
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packer = (struct rtp_packer_t *)p;
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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 * packer->frequency / 1000; // ms -> 8KHZ
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packer->pkt.rtp.m = 0; // marker bit alway 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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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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//packer->pkt.rtp.timestamp += packer->pkt.payloadlen * packer->frequency / 1000;
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}
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return r;
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}
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struct rtp_payload_encode_t *rtp_common_encode()
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{
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static struct rtp_payload_encode_t packer = {
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rtp_pack_create,
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rtp_pack_destroy,
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rtp_pack_get_info,
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rtp_pack_input,
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};
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return &packer;
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}
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