114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
// RFC7741 RTP Payload Format for VP8 Video
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//
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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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// Timestamp: The granularity of the clock is 90 kHz
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#define KHz 90 // 90000Hz
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#define N_VP8_HEADER 1
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struct rtp_encode_vp8_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_vp8_pack_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_vp8_t *packer;
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packer = (struct rtp_encode_vp8_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_vp8_pack_destroy(void* pack)
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{
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struct rtp_encode_vp8_t *packer;
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packer = (struct rtp_encode_vp8_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_vp8_pack_get_info(void* pack, uint16_t* seq, uint32_t* timestamp)
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{
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struct rtp_encode_vp8_t *packer;
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packer = (struct rtp_encode_vp8_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_vp8_pack_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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uint8_t vp8_payload_descriptor[1];
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const uint8_t *ptr;
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struct rtp_encode_vp8_t *packer;
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packer = (struct rtp_encode_vp8_t *)pack;
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packer->pkt.rtp.timestamp = timestamp; //(uint32_t)(time * KHz);
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r = 0;
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ptr = (const uint8_t *)data;
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for (vp8_payload_descriptor[0] = 0x10 /*start of partition*/; 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 + N_VP8_HEADER + RTP_FIXED_HEADER) <= packer->size ? bytes : (packer->size - N_VP8_HEADER - 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 + N_VP8_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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// Marker bit (M): MUST be set for the very last packet of each encoded
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// frame in line with the normal use of the M bit in video formats.
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packer->pkt.rtp.m = (0 == bytes) ? 1 : 0;
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n = rtp_packet_serialize_header(&packer->pkt, rtp, n);
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if (n != RTP_FIXED_HEADER)
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{
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assert(0);
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return -1;
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}
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memcpy(rtp + n, vp8_payload_descriptor, N_VP8_HEADER);
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memcpy(rtp + n + N_VP8_HEADER, packer->pkt.payload, packer->pkt.payloadlen);
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r = packer->handler.packet(packer->cbparam, rtp, n + N_VP8_HEADER + packer->pkt.payloadlen, packer->pkt.rtp.timestamp, 0);
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packer->handler.free(packer->cbparam, rtp);
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vp8_payload_descriptor[0] = 0x00;
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}
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return r;
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}
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struct rtp_payload_encode_t *rtp_vp8_encode()
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{
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static struct rtp_payload_encode_t encode = {
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rtp_vp8_pack_create,
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rtp_vp8_pack_destroy,
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rtp_vp8_pack_get_info,
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rtp_vp8_pack_input,
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};
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return &encode;
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}
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