135 lines
3.2 KiB
C++
135 lines
3.2 KiB
C++
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// PHZ
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// 2018-5-16
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#if defined(WIN32) || defined(_WIN32)
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#ifndef _CRT_SECURE_NO_WARNINGS
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#define _CRT_SECURE_NO_WARNINGS
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#endif
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#endif
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#include "AACSource.h"
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#include <stdlib.h>
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#include <cstdio>
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#include <chrono>
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#if defined(__linux) || defined(__linux__)
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#include <sys/time.h>
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#endif
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using namespace xop;
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using namespace std;
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AACSource::AACSource(uint32_t samplerate, uint32_t channels, bool has_adts)
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: samplerate_(samplerate)
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, channels_(channels)
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, has_adts_(has_adts)
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{
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payload_ = 97;
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media_type_ = AAC;
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clock_rate_ = samplerate;
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}
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AACSource* AACSource::CreateNew(uint32_t samplerate, uint32_t channels, bool has_adts)
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{
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return new AACSource(samplerate, channels, has_adts);
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}
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AACSource::~AACSource()
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{
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}
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string AACSource::GetMediaDescription(uint16_t port)
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{
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char buf[100] = { 0 };
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sprintf(buf, "m=audio %hu RTP/AVP 97", port); // \r\nb=AS:64
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return string(buf);
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}
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static uint32_t AACSampleRate[16] =
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{
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96000, 88200, 64000, 48000,
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44100, 32000, 24000, 22050,
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16000, 12000, 11025, 8000,
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7350, 0, 0, 0 /*reserved */
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};
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string AACSource::GetAttribute() // RFC 3640
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{
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char buf[500] = { 0 };
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sprintf(buf, "a=rtpmap:97 MPEG4-GENERIC/%u/%u\r\n", samplerate_, channels_);
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uint8_t index = 0;
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for (index = 0; index < 16; index++) {
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if (AACSampleRate[index] == samplerate_) {
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break;
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}
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}
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if (index == 16) {
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return ""; // error
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}
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uint8_t profile = 1;
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char config[10] = {0};
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sprintf(config, "%02x%02x", (uint8_t)((profile+1) << 3)|(index >> 1), (uint8_t)((index << 7)|(channels_<< 3)));
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sprintf(buf+strlen(buf),
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"a=fmtp:97 profile-level-id=1;"
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"mode=AAC-hbr;"
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"sizelength=13;indexlength=3;indexdeltalength=3;"
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"config=%04u",
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atoi(config));
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return string(buf);
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}
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bool AACSource::HandleFrame(MediaChannelId channel_id, AVFrame frame)
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{
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if (frame.size > (MAX_RTP_PAYLOAD_SIZE-AU_SIZE)) {
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return false;
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}
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int adts_size = 0;
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if (has_adts_) {
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adts_size = ADTS_SIZE;
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}
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uint8_t *frame_buf = frame.buffer.get() + adts_size;
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uint32_t frame_size = frame.size - adts_size;
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char AU[AU_SIZE] = { 0 };
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AU[0] = 0x00;
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AU[1] = 0x10;
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AU[2] = (frame_size & 0x1fe0) >> 5;
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AU[3] = (frame_size & 0x1f) << 3;
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RtpPacket rtp_pkt;
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rtp_pkt.type = frame.type;
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rtp_pkt.timestamp = frame.timestamp;
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rtp_pkt.size = frame_size + RTP_TCP_HEAD_SIZE + RTP_HEADER_SIZE + AU_SIZE;
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rtp_pkt.last = 1;
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rtp_pkt.data.get()[RTP_TCP_HEAD_SIZE + RTP_HEADER_SIZE + 0] = AU[0];
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rtp_pkt.data.get()[RTP_TCP_HEAD_SIZE + RTP_HEADER_SIZE + 1] = AU[1];
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rtp_pkt.data.get()[RTP_TCP_HEAD_SIZE + RTP_HEADER_SIZE + 2] = AU[2];
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rtp_pkt.data.get()[RTP_TCP_HEAD_SIZE + RTP_HEADER_SIZE + 3] = AU[3];
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memcpy(rtp_pkt.data.get()+RTP_TCP_HEAD_SIZE+RTP_HEADER_SIZE+AU_SIZE, frame_buf, frame_size);
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if (send_frame_callback_) {
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send_frame_callback_(channel_id, rtp_pkt);
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}
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return true;
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}
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uint32_t AACSource::GetTimestamp(uint32_t sampleRate)
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{
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//auto time_point = chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now());
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//return (uint32_t)(time_point.time_since_epoch().count() * sampleRate / 1000);
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auto time_point = chrono::time_point_cast<chrono::microseconds>(chrono::steady_clock::now());
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return (uint32_t)((time_point.time_since_epoch().count()+500) / 1000 * sampleRate / 1000);
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}
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