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Diffstat (limited to 'ffmpeg/libavcodec/fmtconvert.c')
| -rw-r--r-- | ffmpeg/libavcodec/fmtconvert.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/fmtconvert.c b/ffmpeg/libavcodec/fmtconvert.c new file mode 100644 index 0000000..79e9645 --- /dev/null +++ b/ffmpeg/libavcodec/fmtconvert.c @@ -0,0 +1,121 @@ +/* + * Format Conversion Utils + * Copyright (c) 2000, 2001 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avcodec.h" +#include "fmtconvert.h" +#include "libavutil/common.h" + +static void int32_to_float_fmul_scalar_c(float *dst, const int *src, float mul, int len){ + int i; + for(i=0; i<len; i++) + dst[i] = src[i] * mul; +} + +static av_always_inline int float_to_int16_one(const float *src){ + return av_clip_int16(lrintf(*src)); +} + +static void float_to_int16_c(int16_t *dst, const float *src, long len) +{ + int i; + for(i=0; i<len; i++) + dst[i] = float_to_int16_one(src+i); +} + +static void float_to_int16_interleave_c(int16_t *dst, const float **src, + long len, int channels) +{ + int i,j,c; + if(channels==2){ + for(i=0; i<len; i++){ + dst[2*i] = float_to_int16_one(src[0]+i); + dst[2*i+1] = float_to_int16_one(src[1]+i); + } + }else{ + for(c=0; c<channels; c++) + for(i=0, j=c; i<len; i++, j+=channels) + dst[j] = float_to_int16_one(src[c]+i); + } +} + +void ff_float_interleave_c(float *dst, const float **src, unsigned int len, + int channels) +{ + int j, c; + unsigned int i; + if (channels == 2) { + for (i = 0; i < len; i++) { + dst[2*i] = src[0][i]; + dst[2*i+1] = src[1][i]; + } + } else if (channels == 1 && len < INT_MAX / sizeof(float)) { + memcpy(dst, src[0], len * sizeof(float)); + } else { + for (c = 0; c < channels; c++) + for (i = 0, j = c; i < len; i++, j += channels) + dst[j] = src[c][i]; + } +} + +av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx) +{ + c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c; + c->float_to_int16 = float_to_int16_c; + c->float_to_int16_interleave = float_to_int16_interleave_c; + c->float_interleave = ff_float_interleave_c; + + if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx); + if (HAVE_ALTIVEC) ff_fmt_convert_init_altivec(c, avctx); + if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx); + if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c); +} + +/* ffdshow custom code */ +void float_interleave(float *dst, const float **src, long len, int channels) +{ + int i,j,c; + if(channels==2){ + for(i=0; i<len; i++){ + dst[2*i] = src[0][i] / 32768.0f; + dst[2*i+1] = src[1][i] / 32768.0f; + } + }else{ + for(c=0; c<channels; c++) + for(i=0, j=c; i<len; i++, j+=channels) + dst[j] = src[c][i] / 32768.0f; + } +} + +void float_interleave_noscale(float *dst, const float **src, long len, int channels) +{ + int i,j,c; + if(channels==2){ + for(i=0; i<len; i++){ + dst[2*i] = src[0][i]; + dst[2*i+1] = src[1][i]; + } + }else{ + for(c=0; c<channels; c++) + for(i=0, j=c; i<len; i++, j+=channels) + dst[j] = src[c][i]; + } +} |