mistserver/src/output/output_wav.cpp
2019-01-26 00:51:30 +01:00

131 lines
4.1 KiB
C++

#include "output_wav.h"
#include <mist/riff.h>
#include <mist/util.h>
namespace Mist{
OutWAV::OutWAV(Socket::Connection &conn) : HTTPOutput(conn){}
void OutWAV::init(Util::Config *cfg){
HTTPOutput::init(cfg);
capa["name"] = "WAV";
capa["friendly"] = "WAV over HTTP";
capa["desc"] = "Pseudostreaming in WAV format over HTTP";
capa["url_rel"] = "/$.wav";
capa["url_match"] = "/$.wav";
capa["codecs"][0u][0u].append("ALAW");
capa["codecs"][0u][0u].append("ULAW");
capa["codecs"][0u][0u].append("MP3");
capa["codecs"][0u][0u].append("PCM");
capa["codecs"][0u][0u].append("FLOAT");
capa["methods"][0u]["handler"] = "http";
capa["methods"][0u]["type"] = "html5/audio/wav";
capa["methods"][0u]["priority"] = 1;
capa["push_urls"].append("/*.wav");
JSON::Value opt;
opt["arg"] = "string";
opt["default"] = "";
opt["arg_num"] = 1;
opt["help"] = "Target filename to store WAV file as, or - for stdout.";
cfg->addOption("target", opt);
}
bool OutWAV::isRecording(){return config->getString("target").size();}
void OutWAV::sendNext(){
char *dataPointer = 0;
size_t len = 0;
thisPacket.getString("data", dataPointer, len);
//PCM must be converted to little-endian if > 8 bits per sample
static Util::ResizeablePointer swappy;
DTSC::Track & trk = myMeta.tracks[thisPacket.getTrackId()];
if (trk.codec == "PCM"){
if (trk.size > 8 && swappy.allocate(len)){
if (trk.size == 16){
for (uint32_t i = 0; i < len; i+=2){
swappy[i] = dataPointer[i+1];
swappy[i+1] = dataPointer[i];
}
}
if (trk.size == 24){
for (uint32_t i = 0; i < len; i+=3){
swappy[i] = dataPointer[i+2];
swappy[i+1] = dataPointer[i+1];
swappy[i+2] = dataPointer[i];
}
}
dataPointer = swappy;
}
}
myConn.SendNow(dataPointer, len);
}
void OutWAV::sendHeader(){
if (!isRecording()){
H.Clean();
H.SetHeader("Content-Type", "audio/wav");
H.protocol = "HTTP/1.0";
H.setCORSHeaders();
H.SendResponse("200", "OK", myConn);
}
DTSC::Track &Trk = myMeta.tracks[getMainSelectedTrack()];
// Send WAV header
char riffHeader[] = "RIFF\377\377\377\377WAVE";
// For live we send max allowed size
// VoD size of the whole thing is RIFF(4)+fmt(26)+fact(12)+LIST(30)+data(8)+data itself
uint32_t total_data = 0xFFFFFFFFul - 80;
if (!myMeta.live){
total_data = 0;
for (std::deque<unsigned long>::iterator it = Trk.keySizes.begin(); it != Trk.keySizes.end();
++it){
total_data += *it;
}
}
Bit::htobl_le(riffHeader + 4, 80 + total_data);
myConn.SendNow(riffHeader, 12);
// Send format details
uint16_t fmt = 0;
if (Trk.codec == "ALAW"){fmt = 6;}
if (Trk.codec == "ULAW"){fmt = 7;}
if (Trk.codec == "PCM"){fmt = 1;}
if (Trk.codec == "FLOAT"){fmt = 3;}
if (Trk.codec == "MP3"){fmt = 85;}
myConn.SendNow(RIFF::fmt::generate(fmt, Trk.channels, Trk.rate, Trk.bps,
Trk.channels * (Trk.size << 3), Trk.size));
// Send sample count per channel
if (fmt != 1){//Not required for PCM
if (!myMeta.live){
myConn.SendNow(RIFF::fact::generate(((Trk.lastms - Trk.firstms) * Trk.rate) / 1000));
}else{
myConn.SendNow(RIFF::fact::generate(0xFFFFFFFFul));
}
}
// Send MistServer identifier
myConn.SendNow("LIST\026\000\000\000infoISFT\012\000\000\000MistServer", 30);
// Start data chunk
char dataChunk[] = "data\377\377\377\377";
Bit::htobl_le(dataChunk + 4, total_data);
myConn.SendNow(dataChunk, 8);
sentHeader = true;
}
void OutWAV::onHTTP(){
std::string method = H.method;
H.Clean();
H.setCORSHeaders();
if (method == "OPTIONS" || method == "HEAD"){
H.SetHeader("Content-Type", "audio/wav");
H.protocol = "HTTP/1.0";
H.SendResponse("200", "OK", myConn);
H.Clean();
return;
}
parseData = true;
wantRequest = false;
}
}