FFmpeg: libavcodec/fmtconvert.c Source File

FFmpeg

[フレーム]

libavcodec

fmtconvert.c

Go to the documentation of this file.

1 /*

2 * Format Conversion Utils

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

23 #include "avcodec.h"

24 #include "fmtconvert.h"

25 #include "libavutil/common.h"

27 static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,

28 float mul, int len)

29 {

30 int i;

31 for(i=0; i<len; i++)

32 dst[i] = src[i] * mul;

33 }

35 static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,

36 const int32_t *src, const float *mul,

37 int len)

38 {

39 int i;

40 for (i = 0; i < len; i += 8)

41 c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);

42 }

44 av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)

45 {

46 c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;

47 c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;

49 if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);

50 if (ARCH_PPC) ff_fmt_convert_init_ppc(c, avctx);

51 if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);

52 if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);

53 }

55 /* ffdshow custom code */

56 void float_interleave(float *dst, const float **src, long len, int channels)

57 {

58 int i,j,c;

59 if(channels==2){

60 for(i=0; i<len; i++){

61 dst[2*i] = src[0][i] / 32768.0f;

62 dst[2*i+1] = src[1][i] / 32768.0f;

63 }

64 }else{

65 for(c=0; c<channels; c++)

66 for(i=0, j=c; i<len; i++, j+=channels)

67 dst[j] = src[c][i] / 32768.0f;

68 }

69 }

71 void float_interleave_noscale(float *dst, const float **src, long len, int channels)

72 {

73 int i,j,c;

74 if(channels==2){

75 for(i=0; i<len; i++){

76 dst[2*i] = src[0][i];

77 dst[2*i+1] = src[1][i];

78 }

79 }else{

80 for(c=0; c<channels; c++)

81 for(i=0, j=c; i<len; i++, j+=channels)

82 dst[j] = src[c][i];

83 }

84 }

Generated on Sun Mar 8 2015 02:34:51 for FFmpeg by doxygen 1.8.2