FFmpeg: libavcodec/flacdsp.c Source File

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libavcodec

flacdsp.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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

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

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

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

10 *

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

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

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

14 * Lesser General Public License for more details.

15 *

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

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

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

19 */

21 #include "libavutil/attributes.h"

22 #include "libavutil/internal.h"

23 #include "libavutil/samplefmt.h"

24 #include "flacdsp.h"

25 #include "config.h"

27 #define SAMPLE_SIZE 16

28 #define PLANAR 0

29 #include "flacdsp_template.c"

31 #undef PLANAR

32 #define PLANAR 1

33 #include "flacdsp_template.c"

35 #undef SAMPLE_SIZE

36 #undef PLANAR

37 #define SAMPLE_SIZE 32

38 #define PLANAR 0

39 #include "flacdsp_template.c"

41 #undef PLANAR

42 #define PLANAR 1

43 #include "flacdsp_template.c"

45 static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],

46 int pred_order, int qlevel, int len)

47 {

48 int i, j;

50 for (i = pred_order; i < len - 1; i += 2, decoded += 2) {

51 SUINT c = coeffs[0];

52 SUINT d = decoded[0];

53 int s0 = 0, s1 = 0;

54 for (j = 1; j < pred_order; j++) {

55 s0 += c*d;

56 d = decoded[j];

57 s1 += c*d;

58 c = coeffs[j];

59 }

60 s0 += c*d;

61 d = decoded[j] += (SUINT)(s0 >> qlevel);

62 s1 += c*d;

63 decoded[j + 1] += (SUINT)(s1 >> qlevel);

64 }

65 if (i < len) {

66 int sum = 0;

67 for (j = 0; j < pred_order; j++)

68 sum += coeffs[j] * (SUINT)decoded[j];

69 decoded[j] = decoded[j] + (unsigned)(sum >> qlevel);

70 }

71 }

73 static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],

74 int pred_order, int qlevel, int len)

75 {

76 int i, j;

78 for (i = pred_order; i < len; i++, decoded++) {

79 int64_t sum = 0;

80 for (j = 0; j < pred_order; j++)

81 sum += (int64_t)coeffs[j] * decoded[j];

82 decoded[j] += sum >> qlevel;

83 }

85 }

87 static void flac_lpc_33_c(int64_t *decoded, const int32_t *residual,

88 const int coeffs[32], int pred_order,

89 int qlevel, int len)

90 {

91 int i, j;

93 for (i = pred_order; i < len; i++, decoded++) {

94 int64_t sum = 0;

95 for (j = 0; j < pred_order; j++)

96 sum += (int64_t)coeffs[j] * (uint64_t)decoded[j];

97 decoded[j] = residual[i] + (sum >> qlevel);

98 }

99 }

100

101 static void flac_wasted_32_c(int32_t *decoded, int wasted, int len)

102 {

103 for (int i = 0; i < len; i++)

104 decoded[i] = (unsigned)decoded[i] << wasted;

105 }

106

107 static void flac_wasted_33_c(int64_t *decoded, const int32_t *residual,

108 int wasted, int len)

109 {

110 for (int i = 0; i < len; i++)

111 decoded[i] = (uint64_t)residual[i] << wasted;

112 }

113

114 av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)

115 {

116 c->lpc16 = flac_lpc_16_c;

117 c->lpc32 = flac_lpc_32_c;

118 c->lpc33 = flac_lpc_33_c;

119

120 c->wasted32 = flac_wasted_32_c;

121 c->wasted33 = flac_wasted_33_c;

122

123 switch (fmt) {

124 case AV_SAMPLE_FMT_S32:

125 c->decorrelate[0] = flac_decorrelate_indep_c_32;

126 c->decorrelate[1] = flac_decorrelate_ls_c_32;

127 c->decorrelate[2] = flac_decorrelate_rs_c_32;

128 c->decorrelate[3] = flac_decorrelate_ms_c_32;

129 break;

130

131 case AV_SAMPLE_FMT_S32P:

132 c->decorrelate[0] = flac_decorrelate_indep_c_32p;

133 c->decorrelate[1] = flac_decorrelate_ls_c_32p;

134 c->decorrelate[2] = flac_decorrelate_rs_c_32p;

135 c->decorrelate[3] = flac_decorrelate_ms_c_32p;

136 break;

137

138 case AV_SAMPLE_FMT_S16:

139 c->decorrelate[0] = flac_decorrelate_indep_c_16;

140 c->decorrelate[1] = flac_decorrelate_ls_c_16;

141 c->decorrelate[2] = flac_decorrelate_rs_c_16;

142 c->decorrelate[3] = flac_decorrelate_ms_c_16;

143 break;

144

145 case AV_SAMPLE_FMT_S16P:

146 c->decorrelate[0] = flac_decorrelate_indep_c_16p;

147 c->decorrelate[1] = flac_decorrelate_ls_c_16p;

148 c->decorrelate[2] = flac_decorrelate_rs_c_16p;

149 c->decorrelate[3] = flac_decorrelate_ms_c_16p;

150 break;

151 }

152

153 #if ARCH_ARM

154 ff_flacdsp_init_arm(c, fmt, channels);

155 #elif ARCH_RISCV

156 ff_flacdsp_init_riscv(c, fmt, channels);

157 #elif ARCH_X86

158 ff_flacdsp_init_x86(c, fmt, channels);

159 #endif

160 }

int64_t

long long int64_t

Definition: coverity.c:34

AV_SAMPLE_FMT_S32P

@ AV_SAMPLE_FMT_S32P

signed 32 bits, planar

Definition: samplefmt.h:65

flacdsp.h

samplefmt.h

av_cold

#define av_cold

Definition: attributes.h:90

channels

Definition: aptx.h:31

Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c

Definition: undefined.txt:32

flac_lpc_32_c

static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32], int pred_order, int qlevel, int len)

Definition: flacdsp.c:73

flac_wasted_32_c

static void flac_wasted_32_c(int32_t *decoded, int wasted, int len)

Definition: flacdsp.c:101

ff_flacdsp_init

av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)

Definition: flacdsp.c:114

attributes.h

flac_lpc_33_c