audioconvert.h 2.5 KB

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  1. /*
  2. * audio conversion
  3. * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  4. * Copyright (c) 2008 Peter Ross
  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. */
  22. #ifndef SWR_AUDIOCONVERT_H
  23. #define SWR_AUDIOCONVERT_H
  24. /**
  25. * @file
  26. * Audio format conversion routines
  27. */
  28. #include "swresample_internal.h"
  29. #include "libavutil/cpu.h"
  30. #include "libavutil/audioconvert.h"
  31. typedef void (conv_func_type)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end);
  32. typedef void (simd_func_type)(uint8_t **dst, const uint8_t **src, int len);
  33. typedef struct AudioConvert {
  34. int channels;
  35. conv_func_type *conv_f;
  36. simd_func_type *simd_f;
  37. const int *ch_map;
  38. uint8_t silence[8]; ///< silence input sample
  39. }AudioConvert;
  40. /**
  41. * Create an audio sample format converter context
  42. * @param out_fmt Output sample format
  43. * @param in_fmt Input sample format
  44. * @param channels Number of channels
  45. * @param flags See AV_CPU_FLAG_xx
  46. * @param ch_map list of the channels id to pick from the source stream, NULL
  47. * if all channels must be selected
  48. * @return NULL on error
  49. */
  50. AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt,
  51. enum AVSampleFormat in_fmt,
  52. int channels, const int *ch_map,
  53. int flags);
  54. /**
  55. * Free audio sample format converter context.
  56. * and set the pointer to NULL
  57. */
  58. void swri_audio_convert_free(AudioConvert **ctx);
  59. /**
  60. * Convert between audio sample formats
  61. * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel.
  62. * @param[in] in array of input buffers for each channel
  63. * @param len length of audio frame size (measured in samples)
  64. */
  65. int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len);
  66. #endif /* AUDIOCONVERT_H */