libavcodec/dv_profile.h

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; 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 /*
  29  * AVDVProfile is used to express the differences between various
  30  * DV flavors. For now it's primarily used for differentiating
  31  * 525/60 and 625/50, but the plans are to use it for various
  32  * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
  33  */
  34 typedef struct AVDVProfile {
  35     int              dsf;                   /* value of the dsf in the DV header */
  36     int              video_stype;           /* stype for VAUX source pack */
  37     int              frame_size;            /* total size of one frame in bytes */
  38     int              difseg_size;           /* number of DIF segments per DIF channel */
  39     int              n_difchan;             /* number of DIF channels per frame */
  40     AVRational       time_base;             /* 1/framerate */
  41     int              ltc_divisor;           /* FPS from the LTS standpoint */
  42     int              height;                /* picture height in pixels */
  43     int              width;                 /* picture width in pixels */
  44     AVRational       sar[2];                /* sample aspect ratios for 4:3 and 16:9 */
  45     enum AVPixelFormat pix_fmt;             /* picture pixel format */
  46     int              bpm;                   /* blocks per macroblock */
  47     const uint8_t   *block_sizes;           /* AC block sizes, in bits */
  48     int              audio_stride;          /* size of audio_shuffle table */
  49     int              audio_min_samples[3];  /* min amount of audio samples */
  50                                             /* for 48kHz, 44.1kHz and 32kHz */
  51     int              audio_samples_dist[5]; /* how many samples are supposed to be */
  52                                             /* in each frame in a 5 frames window */
  53     const uint8_t  (*audio_shuffle)[9];     /* PCM shuffling table */
  54 } AVDVProfile;
  55
  56 /**
  57  * Get a DV profile for the provided compressed frame.
  58  *
  59  * @param sys the profile used for the previous frame, may be NULL
  60  * @param frame the compressed data buffer
  61  * @param buf_size size of the buffer in bytes
  62  * @return the DV profile for the supplied data or NULL on failure
  63  */
  64 const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys,
  65                                        const uint8_t *frame, unsigned buf_size);
  66
  67 /**
  68  * Get a DV profile for the provided stream parameters.
  69  */
  70 const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt);
  71
  72 #endif /* AVCODEC_DV_PROFILE_H */