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dv_profile.h 3.7KB

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  1. /*
  2. * This file is part of FFmpeg.
  3. *
  4. * FFmpeg is free software; you can redistribute it and/or
  5. * modify it under the terms of the GNU Lesser General Public
  6. * License as published by the Free Software Foundation; either
  7. * version 2.1 of the License, or (at your option) any later version.
  8. *
  9. * FFmpeg is distributed in the hope that it will be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. * Lesser General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU Lesser General Public
  15. * License along with FFmpeg; if not, write to the Free Software
  16. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17. */
  18. #ifndef AVCODEC_DV_PROFILE_H
  19. #define AVCODEC_DV_PROFILE_H
  20. #include <stdint.h>
  21. #include "libavutil/pixfmt.h"
  22. #include "libavutil/rational.h"
  23. #include "avcodec.h"
  24. /* minimum number of bytes to read from a DV stream in order to
  25. * determine the profile */
  26. #define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
  27. /*
  28. * AVDVProfile is used to express the differences between various
  29. * DV flavors. For now it's primarily used for differentiating
  30. * 525/60 and 625/50, but the plans are to use it for various
  31. * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
  32. */
  33. typedef struct AVDVProfile {
  34. int dsf; /* value of the dsf in the DV header */
  35. int video_stype; /* stype for VAUX source pack */
  36. int frame_size; /* total size of one frame in bytes */
  37. int difseg_size; /* number of DIF segments per DIF channel */
  38. int n_difchan; /* number of DIF channels per frame */
  39. AVRational time_base; /* 1/framerate */
  40. int ltc_divisor; /* FPS from the LTS standpoint */
  41. int height; /* picture height in pixels */
  42. int width; /* picture width in pixels */
  43. AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
  44. enum AVPixelFormat pix_fmt; /* picture pixel format */
  45. int bpm; /* blocks per macroblock */
  46. const uint8_t *block_sizes; /* AC block sizes, in bits */
  47. int audio_stride; /* size of audio_shuffle table */
  48. int audio_min_samples[3]; /* min amount of audio samples */
  49. /* for 48kHz, 44.1kHz and 32kHz */
  50. int audio_samples_dist[5]; /* how many samples are supposed to be */
  51. /* in each frame in a 5 frames window */
  52. const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
  53. } AVDVProfile;
  54. #if FF_API_DV_FRAME_PROFILE
  55. /**
  56. * @deprecated use av_dv_frame_profile()
  57. */
  58. attribute_deprecated
  59. const AVDVProfile* avpriv_dv_frame_profile2(AVCodecContext* codec, const AVDVProfile *sys,
  60. const uint8_t* frame, unsigned buf_size);
  61. #endif
  62. /**
  63. * Get a DV profile for the provided compressed frame.
  64. *
  65. * @param sys the profile used for the previous frame, may be NULL
  66. * @param frame the compressed data buffer
  67. * @param buf_size size of the buffer in bytes
  68. * @return the DV profile for the supplied data or NULL on failure
  69. */
  70. const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys,
  71. const uint8_t *frame, unsigned buf_size);
  72. /**
  73. * Get a DV profile for the provided stream parameters.
  74. */
  75. const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt);
  76. #endif /* AVCODEC_DV_PROFILE_H */