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aacrtmppackager.cpp
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aacrtmppackager.cpp
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#include "aacrtmppackager.h"
#include <string.h>
namespace LQF {
void AACRTMPPackager::Pack(RTMPPacket *packet, char* buf, const char* data, int length) const
{
char *body = buf + RTMP_MAX_HEADER_SIZE;
RTMPPacket_Reset(packet);
packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
packet->m_packetType = RTMP_PACKET_TYPE_AUDIO;
packet->m_nChannel = RTMP_AUDIO_CHANNEL;
packet->m_hasAbsTimestamp = 0;
packet->m_nBodySize = length - 5; // adts头7个字节 -7 + 2 = -5
packet->m_body = body;
*(body++) = 0xAF;
*(body++) = 0x01;
memcpy(body, data + 7, length - 7);
}
void AACRTMPPackager::Metadata(RTMPPacket *packet, char* buf, const char* data, int length) const
{
char *body = buf + RTMP_MAX_HEADER_SIZE;
RTMPPacket_Reset(packet);
packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
packet->m_packetType = RTMP_PACKET_TYPE_AUDIO;
packet->m_nChannel = RTMP_AUDIO_CHANNEL;
packet->m_hasAbsTimestamp = 0;
packet->m_nBodySize = length + 2;
packet->m_body = body;
*(body++) = 0xAF;
*(body++) = 0x00;
memcpy(body, data, length);
}
//参考 https://wiki.multimedia.cx/index.php?title=MPEG-4_Audio#Audio_Specific_Config
int AACRTMPPackager::GetAudioSpecificConfig(uint8_t* data, const uint32_t profile,
const uint32_t samplerate,
const uint32_t channel_num)
{
//共2字节
//uint8_t type:5;//编码结构类型,AAC main编码为1,LOW低复杂度编码为2,SSR为3
//uint8_t sample_rate:4;//采样率
//uint8_t channel_num:4;//声道数
//uint8_t tail:3;//最后3位固定为0
//AudioSpecificConfig
uint16_t _profile = (uint16_t)profile+1;
_profile <<= 11;
uint32_t _samplerate = 0;
switch (samplerate)
{
case 96000:
_samplerate = 0;
break;
case 88200:
_samplerate = 1;
break;
case 64000:
_samplerate = 2;
break;
case 48000:
_samplerate = 3;
break;
case 44100:
_samplerate = 4;
break;
case 32000:
_samplerate = 5;
break;
case 24000:
_samplerate = 6;
break;
case 22050:
_samplerate = 7;
break;
case 16000:
_samplerate = 8;
break;
case 12000:
_samplerate = 9;
break;
case 11025:
_samplerate = 10;
break;
case 8000:
_samplerate = 11;
break;
case 7350:
_samplerate = 12;
break;
default:
_samplerate = 4;
return -1;
break;
}
_samplerate <<= 7;
uint16_t _channel_num = (uint16_t)channel_num;
_channel_num <<= 3;
uint16_t audio_spec = _profile | _samplerate | _channel_num;
data[0] = (uint8_t)(audio_spec >> 8);
data[1] = 0xff & audio_spec;
// AudioSpecificConfig config;
return 0;
}
void AACRTMPPackager::PacketADTSHeader(uint8_t * packet, int packet_len, int profile, int freq_idx, int channel_config)
{
/*int avpriv_mpeg4audio_sample_rates[] = {
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000, 7350
};
channel_configuration: 表示声道数chanCfg
0: Defined in AOT Specifc Config
1: 1 channel: front-center
2: 2 channels: front-left, front-right
3: 3 channels: front-center, front-left, front-right
4: 4 channels: front-center, front-left, front-right, back-center
5: 5 channels: front-center, front-left, front-right, back-left, back-right
6: 6 channels: front-center, front-left, front-right, back-left, back-right, LFE-channel
7: 8 channels: front-center, front-left, front-right, side-left, side-right, back-left, back-right, LFE-channel
8-15: Reserved
*/
// fill in ADTS data
packet[0] = (uint8_t)0xFF;
packet[1] = (uint8_t)0xF9;
packet[2] = (uint8_t)(((profile - 1) << 6) + (freq_idx << 2) + (channel_config >> 2));
packet[3] = (uint8_t)(((channel_config & 3) << 6) + (packet_len >> 11));
packet[4] = (uint8_t)((packet_len & 0x7FF) >> 3);
packet[5] = (uint8_t)(((packet_len & 7) << 5) + 0x1F);
packet[6] = (uint8_t)0xFC;
}
}