Method lame_encode_frame_init

src/main/java/mp3/Encoder.java:280–320

(final LameGlobalFlags gfp,
			final float inbuf[][])

	}

	private void lame_encode_frame_init(final LameGlobalFlags gfp,
			final float inbuf[][]) {
		final LameInternalFlags gfc = gfp.internal_flags;

		int ch, gr;

		if (gfc.lame_encode_frame_init == 0) {
			/* prime the MDCT/polyphase filterbank with a short block */
			int i, j;
			float primebuff0[] = new float[286 + 1152 + 576];
			float primebuff1[] = new float[286 + 1152 + 576];
			gfc.lame_encode_frame_init = 1;
			for (i = 0, j = 0; i < 286 + 576 * (1 + gfc.mode_gr); ++i) {
				if (i < 576 * gfc.mode_gr) {
					primebuff0[i] = 0;
					if (gfc.channels_out == 2)
						primebuff1[i] = 0;
				} else {
					primebuff0[i] = inbuf[0][j];
					if (gfc.channels_out == 2)
						primebuff1[i] = inbuf[1][j];
					++j;
				}
			}
			/* polyphase filtering / mdct */
			for (gr = 0; gr < gfc.mode_gr; gr++) {
				for (ch = 0; ch < gfc.channels_out; ch++) {
					gfc.l3_side.tt[gr][ch].block_type = SHORT_TYPE;
				}
			}
			newMDCT.mdct_sub48(gfc, primebuff0, primebuff1);

			/* check FFT will not use a negative starting offset */
			assert (576 >= FFTOFFSET);
			/* check if we have enough data for FFT */
			assert (gfc.mf_size >= (BLKSIZE + gfp.framesize - FFTOFFSET));
			/* check if we have enough data for polyphase filterbank */
			assert (gfc.mf_size >= (512 + gfp.framesize - 32));
		}

	}

	/**
	 * <PRE>