resampler_private.h 4.4 KB

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  1. /***********************************************************************
  2. Copyright (c) 2006-2011, Skype Limited. All rights reserved.
  3. Redistribution and use in source and binary forms, with or without
  4. modification, are permitted provided that the following conditions
  5. are met:
  6. - Redistributions of source code must retain the above copyright notice,
  7. this list of conditions and the following disclaimer.
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  9. notice, this list of conditions and the following disclaimer in the
  10. documentation and/or other materials provided with the distribution.
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  12. names of specific contributors, may be used to endorse or promote
  13. products derived from this software without specific prior written
  14. permission.
  15. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  16. AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17. IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18. ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  19. LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  25. POSSIBILITY OF SUCH DAMAGE.
  26. ***********************************************************************/
  27. #ifndef SILK_RESAMPLER_PRIVATE_H
  28. #define SILK_RESAMPLER_PRIVATE_H
  29. #ifdef __cplusplus
  30. extern "C" {
  31. #endif
  32. #include "SigProc_FIX.h"
  33. #include "resampler_structs.h"
  34. #include "resampler_rom.h"
  35. /* Number of input samples to process in the inner loop */
  36. #define RESAMPLER_MAX_BATCH_SIZE_MS 10
  37. #define RESAMPLER_MAX_FS_KHZ 48
  38. #define RESAMPLER_MAX_BATCH_SIZE_IN ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ )
  39. /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
  40. void silk_resampler_private_IIR_FIR(
  41. void *SS, /* I/O Resampler state */
  42. opus_int16 out[], /* O Output signal */
  43. const opus_int16 in[], /* I Input signal */
  44. opus_int32 inLen /* I Number of input samples */
  45. );
  46. /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
  47. void silk_resampler_private_down_FIR(
  48. void *SS, /* I/O Resampler state */
  49. opus_int16 out[], /* O Output signal */
  50. const opus_int16 in[], /* I Input signal */
  51. opus_int32 inLen /* I Number of input samples */
  52. );
  53. /* Upsample by a factor 2, high quality */
  54. void silk_resampler_private_up2_HQ_wrapper(
  55. void *SS, /* I/O Resampler state (unused) */
  56. opus_int16 *out, /* O Output signal [ 2 * len ] */
  57. const opus_int16 *in, /* I Input signal [ len ] */
  58. opus_int32 len /* I Number of input samples */
  59. );
  60. /* Upsample by a factor 2, high quality */
  61. void silk_resampler_private_up2_HQ(
  62. opus_int32 *S, /* I/O Resampler state [ 6 ] */
  63. opus_int16 *out, /* O Output signal [ 2 * len ] */
  64. const opus_int16 *in, /* I Input signal [ len ] */
  65. opus_int32 len /* I Number of input samples */
  66. );
  67. /* Second order AR filter */
  68. void silk_resampler_private_AR2(
  69. opus_int32 S[], /* I/O State vector [ 2 ] */
  70. opus_int32 out_Q8[], /* O Output signal */
  71. const opus_int16 in[], /* I Input signal */
  72. const opus_int16 A_Q14[], /* I AR coefficients, Q14 */
  73. opus_int32 len /* I Signal length */
  74. );
  75. #ifdef __cplusplus
  76. }
  77. #endif
  78. #endif /* SILK_RESAMPLER_PRIVATE_H */