void SetupInfo(VorbisInfo& info) const
{
const StreamParameters stream(Params);
const RenderParameters::Ptr sound = RenderParameters::Create(Params);
const uint_t samplerate = sound->SoundFreq();
Dbg("Samplerate is %1%", samplerate);
if (stream.IsABRMode())
{
const uint_t bitrate = stream.GetBitrate();
Dbg("Setting ABR to %1%kbps", bitrate);
info.SetABR(bitrate, samplerate);
}
else
{
const uint_t quality = stream.GetQuality();
Dbg("Setting VBR quality to %1%", quality);
info.SetQuality(quality, samplerate);
}
}
virtual void Startup()
{
Dbg("Starting playback");
SDL_AudioSpec format;
format.format = -1;
const bool sampleSigned = Sample::MID == 0;
switch (Sample::BITS)
{
case 8:
format.format = sampleSigned ? AUDIO_S8 : AUDIO_U8;
break;
case 16:
format.format = sampleSigned ? AUDIO_S16SYS : AUDIO_U16SYS;
break;
default:
assert(!"Invalid format");
}
const RenderParameters::Ptr sound = RenderParameters::Create(Params);
const BackendParameters backend(*Params);
format.freq = sound->SoundFreq();
format.channels = static_cast< ::Uint8>(Sample::CHANNELS);
format.samples = sound->SamplesPerFrame();
//fix if size is not power of 2
if (0 != (format.samples & (format.samples - 1)))
{
unsigned msk = 1;
while (format.samples > msk)
{
msk <<= 1;
}
format.samples = msk;
}
format.callback = OnBuffer;
format.userdata = &Queue;
Queue.SetSize(backend.GetBuffersCount());
CheckCall(SdlApi->SDL_OpenAudio(&format, 0) >= 0, THIS_LINE);
SdlApi->SDL_PauseAudio(0);
}
void SetupContext(lame_global_flags& ctx) const
{
const StreamParameters stream(Params);
const RenderParameters::Ptr sound = RenderParameters::Create(Params);
const uint_t samplerate = sound->SoundFreq();
Dbg("Setting samplerate to %1%Hz", samplerate);
CheckLameCall(LameApi->lame_set_in_samplerate(&ctx, samplerate), THIS_LINE);
CheckLameCall(LameApi->lame_set_out_samplerate(&ctx, samplerate), THIS_LINE);
CheckLameCall(LameApi->lame_set_num_channels(&ctx, Sample::CHANNELS), THIS_LINE);
CheckLameCall(LameApi->lame_set_bWriteVbrTag(&ctx, true), THIS_LINE);
switch (stream.GetBitrateMode())
{
case MODE_CBR:
{
const uint_t bitrate = stream.GetBitrate();
Dbg("Setting bitrate to %1%kbps", bitrate);
CheckLameCall(LameApi->lame_set_VBR(&ctx, vbr_off), THIS_LINE);
CheckLameCall(LameApi->lame_set_brate(&ctx, bitrate), THIS_LINE);
}
break;
case MODE_ABR:
{
const uint_t bitrate = stream.GetBitrate();
Dbg("Setting average bitrate to %1%kbps", bitrate);
CheckLameCall(LameApi->lame_set_VBR(&ctx, vbr_abr), THIS_LINE);
CheckLameCall(LameApi->lame_set_VBR_mean_bitrate_kbps(&ctx, bitrate), THIS_LINE);
}
break;
case MODE_VBR:
{
const uint_t quality = stream.GetQuality();
Dbg("Setting VBR quality to %1%", quality);
CheckLameCall(LameApi->lame_set_VBR(&ctx, vbr_default), THIS_LINE);
CheckLameCall(LameApi->lame_set_VBR_q(&ctx, quality), THIS_LINE);
}
break;
default:
assert(!"Invalid mode");
}
switch (stream.GetChannelsMode())
{
case MODE_DEFAULT:
Dbg("Using default channels mode");
break;
case MODE_STEREO:
Dbg("Using stereo mode");
CheckLameCall(LameApi->lame_set_mode(&ctx, STEREO), THIS_LINE);
break;
case MODE_JOINTSTEREO:
Dbg("Using joint stereo mode");
CheckLameCall(LameApi->lame_set_mode(&ctx, JOINT_STEREO), THIS_LINE);
break;
case MODE_MONO:
Dbg("Using mono mode");
CheckLameCall(LameApi->lame_set_mode(&ctx, MONO), THIS_LINE);
break;
default:
assert(!"Invalid mode");
}
CheckLameCall(LameApi->lame_init_params(&ctx), THIS_LINE);
LameApi->id3tag_init(&ctx);
}