platform/verisilicon/hantro_jpeg.c

1 // SPDX-License-Identifier: GPL-2.0+
6  * Copyright (C) Jean-Francois Moine (http://moinejf.free.fr)
27 /* Default tables from JPEG ITU-T.81
28  * (ISO/IEC 10918-1) Annex K, tables K.1 and K.2
53 	 0,  1,  8, 16,  9,  2,  3, 10,
64 	 0,  8, 16, 24,  1,  9, 17, 25,
141 /* For simplicity, we keep a pre-formatted JPEG header,
149 	/* JFIF-APP0 */
268  * of the SOS segment (the entropy-encoded image scan), which should
269  * trail the whole header, is 8-byte aligned for the hardware to write
273 	      "Hantro JPEG header size needs to be 8-byte aligned.");
281 		temp = 1;  in jpeg_scale_qp()
309 	 * Non-linear scaling factor:  in jpeg_set_quality()
310 	 * [5,50] -> [1000..100], [51,100] -> [98..0]  in jpeg_set_quality()
312 	if (ctx->quality < 50)  in jpeg_set_quality()
313 		scale = 5000 / ctx->quality;  in jpeg_set_quality()
315 		scale = 200 - 2 * ctx->quality;  in jpeg_set_quality()
319 	BUILD_BUG_ON(ARRAY_SIZE(ctx->hw_luma_qtable) != JPEG_QUANT_SIZE);  in jpeg_set_quality()
320 	BUILD_BUG_ON(ARRAY_SIZE(ctx->hw_chroma_qtable) != JPEG_QUANT_SIZE);  in jpeg_set_quality()
322 	jpeg_scale_quant_table(ctx->buffer + LUMA_QUANT_OFF,  in jpeg_set_quality()
323 			       ctx->hw_luma_qtable, luma_q_table, scale);  in jpeg_set_quality()
324 	jpeg_scale_quant_table(ctx->buffer + CHROMA_QUANT_OFF,  in jpeg_set_quality()
325 			       ctx->hw_chroma_qtable, chroma_q_table, scale);  in jpeg_set_quality()
330 	char *buf = ctx->buffer;  in hantro_jpeg_header_assemble()
335 	buf[HEIGHT_OFF + 0] = ctx->height >> 8;  in hantro_jpeg_header_assemble()
336 	buf[HEIGHT_OFF + 1] = ctx->height;  in hantro_jpeg_header_assemble()
337 	buf[WIDTH_OFF + 0] = ctx->width >> 8;  in hantro_jpeg_header_assemble()
338 	buf[WIDTH_OFF + 1] = ctx->width;  in hantro_jpeg_header_assemble()