diff options
Diffstat (limited to 'libmpeg2/uyvy.c')
| -rw-r--r-- | libmpeg2/uyvy.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libmpeg2/uyvy.c b/libmpeg2/uyvy.c new file mode 100644 index 0000000000..7b1759eb10 --- /dev/null +++ b/libmpeg2/uyvy.c @@ -0,0 +1,127 @@ +/* + * uyvy.c + * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org> + * Copyright (C) 2003 Regis Duchesne <hpreg@zoy.org> + * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * + * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. + * See http://libmpeg2.sourceforge.net/ for updates. + * + * mpeg2dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * mpeg2dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include <inttypes.h> + +#include "mpeg2.h" +//#include "mpeg2convert.h" + +typedef struct { + int width; + int stride; + int chroma420; + uint8_t * out; +} convert_uyvy_t; + +static void uyvy_start (void * _id, const mpeg2_fbuf_t * fbuf, + const mpeg2_picture_t * picture, + const mpeg2_gop_t * gop) +{ + convert_uyvy_t * instance = (convert_uyvy_t *) _id; + + instance->out = fbuf->buf[0]; + instance->stride = instance->width; + if (picture->nb_fields == 1) { + if (! (picture->flags & PIC_FLAG_TOP_FIELD_FIRST)) + instance->out += 2 * instance->stride; + instance->stride <<= 1; + } +} + +#ifdef WORDS_BIGENDIAN +#define PACK(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) +#else +#define PACK(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a)) +#endif + +static void uyvy_line (uint8_t * py, uint8_t * pu, uint8_t * pv, void * _dst, + int width) +{ + uint32_t * dst = (uint32_t *) _dst; + + width >>= 4; + do { + dst[0] = PACK (pu[0], py[0], pv[0], py[1]); + dst[1] = PACK (pu[1], py[2], pv[1], py[3]); + dst[2] = PACK (pu[2], py[4], pv[2], py[5]); + dst[3] = PACK (pu[3], py[6], pv[3], py[7]); + dst[4] = PACK (pu[4], py[8], pv[4], py[9]); + dst[5] = PACK (pu[5], py[10], pv[5], py[11]); + dst[6] = PACK (pu[6], py[12], pv[6], py[13]); + dst[7] = PACK (pu[7], py[14], pv[7], py[15]); + py += 16; + pu += 8; + pv += 8; + dst += 8; + } while (--width); +} + +static void uyvy_copy (void * id, uint8_t * const * src, unsigned int v_offset) +{ + const convert_uyvy_t * instance = (convert_uyvy_t *) id; + uint8_t * py; + uint8_t * pu; + uint8_t * pv; + uint8_t * dst; + int height; + + dst = instance->out + 2 * instance->stride * v_offset; + py = src[0]; pu = src[1]; pv = src[2]; + + height = 16; + do { + uyvy_line (py, pu, pv, dst, instance->width); + dst += 2 * instance->stride; + py += instance->stride; + if (! (--height & instance->chroma420)) { + pu += instance->stride >> 1; + pv += instance->stride >> 1; + } + } while (height); +} + +int mpeg2convert_uyvy (int stage, void * _id, const mpeg2_sequence_t * seq, + int stride, uint32_t accel, void * arg, + mpeg2_convert_init_t * result) +{ + convert_uyvy_t * instance = (convert_uyvy_t *) _id; + + if (seq->chroma_width == seq->width) + return 1; + + if (instance) { + instance->width = seq->width; + instance->chroma420 = (seq->chroma_height < seq->height); + result->buf_size[0] = seq->width * seq->height * 2; + result->buf_size[1] = result->buf_size[2] = 0; + result->start = uyvy_start; + result->copy = uyvy_copy; + } else { + result->id_size = sizeof (convert_uyvy_t); + } + + return 0; +} |