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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.  
  19. #ifndef AVCODEC_DV_PROFILE_H
  20. #define AVCODEC_DV_PROFILE_H
  21.  
  22. #include <stdint.h>
  23.  
  24. #include "libavutil/pixfmt.h"
  25. #include "libavutil/rational.h"
  26. #include "avcodec.h"
  27.  
  28. /* minimum number of bytes to read from a DV stream in order to
  29.  * determine the profile */
  30. #define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
  31.  
  32.  
  33. /*
  34.  * AVDVProfile is used to express the differences between various
  35.  * DV flavors. For now it's primarily used for differentiating
  36.  * 525/60 and 625/50, but the plans are to use it for various
  37.  * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
  38.  */
  39. typedef struct AVDVProfile {
  40.     int              dsf;                   /* value of the dsf in the DV header */
  41.     int              video_stype;           /* stype for VAUX source pack */
  42.     int              frame_size;            /* total size of one frame in bytes */
  43.     int              difseg_size;           /* number of DIF segments per DIF channel */
  44.     int              n_difchan;             /* number of DIF channels per frame */
  45.     AVRational       time_base;             /* 1/framerate */
  46.     int              ltc_divisor;           /* FPS from the LTS standpoint */
  47.     int              height;                /* picture height in pixels */
  48.     int              width;                 /* picture width in pixels */
  49.     AVRational       sar[2];                /* sample aspect ratios for 4:3 and 16:9 */
  50.     enum AVPixelFormat pix_fmt;             /* picture pixel format */
  51.     int              bpm;                   /* blocks per macroblock */
  52.     const uint8_t   *block_sizes;           /* AC block sizes, in bits */
  53.     int              audio_stride;          /* size of audio_shuffle table */
  54.     int              audio_min_samples[3];  /* min amount of audio samples */
  55.                                             /* for 48kHz, 44.1kHz and 32kHz */
  56.     int              audio_samples_dist[5]; /* how many samples are supposed to be */
  57.                                             /* in each frame in a 5 frames window */
  58.     const uint8_t  (*audio_shuffle)[9];     /* PCM shuffling table */
  59. } AVDVProfile;
  60.  
  61. #if FF_API_DV_FRAME_PROFILE
  62. /**
  63.  * @deprecated use av_dv_frame_profile()
  64.  */
  65. attribute_deprecated
  66. const AVDVProfile* avpriv_dv_frame_profile2(AVCodecContext* codec, const AVDVProfile *sys,
  67.                                             const uint8_t* frame, unsigned buf_size);
  68. #endif
  69.  
  70. /**
  71.  * Get a DV profile for the provided compressed frame.
  72.  *
  73.  * @param sys the profile used for the previous frame, may be NULL
  74.  * @param frame the compressed data buffer
  75.  * @param buf_size size of the buffer in bytes
  76.  * @return the DV profile for the supplied data or NULL on failure
  77.  */
  78. const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys,
  79.                                        const uint8_t *frame, unsigned buf_size);
  80.  
  81. /**
  82.  * Get a DV profile for the provided stream parameters.
  83.  */
  84. const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt);
  85.  
  86. /**
  87.  * Get a DV profile for the provided stream parameters.
  88.  * The frame rate is used as a best-effort parameter.
  89.  */
  90. const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate);
  91.  
  92. #endif /* AVCODEC_DV_PROFILE_H */
  93.