FFmpeg: libavcodec/fmtconvert.c Source File

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libavcodec

fmtconvert.c

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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 static av_always_inline int float_to_int16_one(const float *src){

45 return av_clip_int16(lrintf(*src));

46 }

48 static void float_to_int16_c(int16_t *dst, const float *src, long len)

49 {

50 int i;

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

52 dst[i] = float_to_int16_one(src+i);

53 }

55 static void float_to_int16_interleave_c(int16_t *dst, const float **src,

56 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] = float_to_int16_one(src[0]+i);

62 dst[2*i+1] = float_to_int16_one(src[1]+i);

63 }

64 }else{

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

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

67 dst[j] = float_to_int16_one(src[c]+i);

68 }

69 }

71 void ff_float_interleave_c(float *dst, const float **src, unsigned int len,

72 int channels)

73 {

74 int j, c;

75 unsigned int i;

76 if (channels == 2) {

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

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

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

80 }

81 } else if (channels == 1 && len < INT_MAX / sizeof(float)) {

82 memcpy(dst, src[0], len * sizeof(float));

83 } else {

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

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

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

87 }

88 }

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

91 {

92 c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;

93 c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;

94 c->float_to_int16 = float_to_int16_c;

95 c->float_to_int16_interleave = float_to_int16_interleave_c;

96 c->float_interleave = ff_float_interleave_c;

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

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

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

101 if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);

102 }

103

104 /* ffdshow custom code */

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

106 {

107 int i,j,c;

108 if(channels==2){

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

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

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

112 }

113 }else{

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

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

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

117 }

118 }

119

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

121 {

122 int i,j,c;

123 if(channels==2){

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

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

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

127 }

128 }else{

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

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

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

132 }

133 }

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