[YuS_2]

А в комплекте bass.chm файлик был?

Цитата из документации с примером

Creates a new sample. HSAMPLE BASS_SampleCreate( DWORD length, DWORD freq, DWORD chans, DWORD max, DWORD flags ); Parameters length The sample's length, in bytes. freq The default sample rate. chans The number of channels... 1 = mono, 2 = stereo, etc. max Maximum number of simultaneous playbacks... 1 (min) - 65535 (max)... use one of the BASS_SAMPLE_OVER flags to choose the override decider, in the case of there being no free channel available for playback (ie. the sample is already playing max times). flags A combination of these flags. BASS_SAMPLE_8BITS Use 8-bit resolution. If neither this or the BASS_SAMPLE_FLOAT flags are specified, then the sample is 16-bit. BASS_SAMPLE_FLOAT Use 32-bit floating-point sample data. Not really recommended for samples as it (at least) doubles the memory usage. BASS_SAMPLE_LOOP Looped? Note that only complete sample loops are allowed; you cannot loop just a part of the sample. More fancy looping can be achieved via streaming. BASS_SAMPLE_SOFTWARE Force the sample to not use hardware DirecSound mixing. BASS_SAMPLE_VAM Enables the DX7 voice allocation and management features on the sample, which allows the sample to be played in software or hardware. This flag is ignored if the BASS_SAMPLE_SOFTWARE flag is also specified. BASS_SAMPLE_3D Enable 3D functionality. This requires that the BASS_DEVICE_3D flag was specified when calling BASS_Init, and the sample must be mono (chans=1). BASS_SAMPLE_MUTEMAX Mute the sample when it is at (or beyond) its max distance (software-mixed 3D samples only). BASS_SAMPLE_OVER_VOL Override: the channel with the lowest volume is overridden. BASS_SAMPLE_OVER_POS Override: the longest playing channel is overridden. BASS_SAMPLE_OVER_DIST Override: the channel furthest away (from the listener) is overridden (3D samples only). Return value If successful, the new sample's handle is returned, else 0 is returned. Use BASS_ErrorGetCode to get the error code. Error codes BASS_ERROR_INIT BASS_Init has not been successfully called. BASS_ERROR_ILLPARAM max is invalid. BASS_ERROR_FORMAT The sample format is not supported by the device/drivers. BASS_ERROR_MEM There is insufficient memory. BASS_ERROR_NO3D Could not initialize 3D support. BASS_ERROR_UNKNOWN Some other mystery problem! Remarks The sample's initial content is undefined. BASS_SampleSetData should be used to set the sample's data. Unless the BASS_SAMPLE_SOFTWARE flag is used, the sample will use hardware mixing if hardware resources are available. Use BASS_GetInfo to see if there are hardware mixing resources available, and which sample formats are supported by the hardware. The BASS_SAMPLE_VAM flag allows a sample to be played by both hardware and software, with the decision made when the sample is played rather than when it is loaded. A sample's VAM options are set via BASS_SampleSetInfo. To play a sample, first a channel must be obtained using BASS_SampleGetChannel, which can then be played using BASS_ChannelPlay. If you want to play a large or one-off sample, then it would probably be better to stream it instead with BASS_StreamCreate. Platform-specific The BASS_SAMPLE_VAM flag is only available when using DirectSound output on Windows and requires DirectX 7 (or above). Example Create a 440 Hz sine wave sample. Код: HSAMPLE sample = BASS_SampleCreate(256, 440 * 64, 1, 1, BASS_SAMPLE_LOOP | BASS_SAMPLE_OVER_POS); // create sample short data[128]; // data buffer int a; for (a = 0; a < 128; a++) data[a] = (short)(32767.0 * sin(a * 6.283185 / 64)); // sine wave BASS_SampleSetData(sample, data); // set the sample's data

Перевод интересующей строки:

Чтобы воспроизвести семпл, сначала необходимо получить канал с помощью BASS_SampleGetChannel, который затем можно воспроизвести с помощью BASS_ChannelPlay.

[tumanovalex]

Спасибо большое, файл справки есть, но невнимательно прочитал.

[tumanovalex]

Возникли еще вопросы.
1. На хабре приведена такая форма расчета для синуса:

Код:

float samplerate; // частота сэмпла
float wavefrequency; // частота волны
float wavevolume; // громкость волны
float period=samplerate/wavefrequency/2; //вычисляем период волны
float pi=3.14; //число pi
int n;
for(int a=0;a<samplelenght;a++) //устанавливаем цикл на длину сэмпла
{
n=wavevolume*sin(a*pi/period); //вычисление sine-волны
buffer[a]=n; //заносим вычисленное значение в буфер
}

В примере по Bass какой параметр равен 64? Если я вставляю 64 как samplerate в формулу на хабре, то звук в динамике по частоте сильно отличается от того, который я слышу при использовании формулы из справки по Bass.
2. Почему длина семпла 256, а размер буфера 128?
Помогите, пожалуйста, разобраться, первый раз пытаюсь создать звук на ПК