JEITA CP-3451
- 85 -
The specific values of the information stored in fmt-ck and fact-ck in the case of the IMA-ADPCM format are given
in Table 27 and Table 28.
Table 27 IMA-ADPCM Format fmt-ck and fact-ck Information (1)
IMA-ADPCM (DVI-ADPCM) Format
Members
Code
ckSize(fmt-ck)
00000014.H (20 bytes)
wFormatTag
0011.H (IMA-ADPCM format)
nChannels
0001.H (monaural) or 0002.H (stereo)
nSamplesPerSec
The values of each mode are as follows.
00001F40.H (8.0 kHz)
00002B11.H (11.025 Hz)
00005622.H (22.050 Hz)
0000AC44.H (44.10 Hz)
nAvgBytesPerSec
The values of each mode are as follows.
00000FD7.H (8.0 kHz, 4-bit monaural)
00001FAE.H (8.0 kHz, 4-bit stereo)
000015D4.H (11.025 kHz, 4-bit monaural)
00002BA9.H (11.025 kHz, 4-bit stereo)
00002B5C.H (22.05 kHz, 4-bit monaural)
000056B9.H (22.05 kHz, 4-bit stereo)
0000566D.H (44.10 kHz, 4-bit monaural)
0000ACDB.H (44.10 kHz, 4-bit stereo)
Definition: nSamplesPerSec*nBlockAlign/wSamplesPerBlock
nBlockAlign
The values of each mode are as follows.
0100.H (8.0 kHz, 4-bit monaural)
0200.H (8.0 kHz, 4-bit stereo)
0100.H (11.025 kHz, 4-bit monaural)
0200.H (11.025 kHz, 4-bit stereo)
0200.H (22.05 kHz, 4-bit monaural)
0400.H (22.05 kHz, 4-bit stereo)
0400.H (44.10 kHz, 4-bit monaural)
0800.H (44.10 kHz, 4-bit stereo)
Although the definition is (N+1) * 4 * nChannels, the use of
256 * nChannels * max (1,nSamplesPerSec / 11.025kHz)
is recommended.
wBitsPerSample
0004.H (4 bits)
cbSize
0002.H