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 typedef struct DVwork_chunk {
  29     uint16_t  buf_offset;
  30     uint16_t  mb_coordinates[5];
  31 } DVwork_chunk;
  32
  33 /*
  34  * DVprofile 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 DVprofile {
  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     DVwork_chunk    *work_chunks;           /* each thread gets its own chunk of frame to work on */
  51     uint32_t        *idct_factor;           /* set of iDCT factor tables */
  52     enum AVPixelFormat pix_fmt;             /* picture pixel format */
  53     int              bpm;                   /* blocks per macroblock */
  54     const uint8_t   *block_sizes;           /* AC block sizes, in bits */
  55     int              audio_stride;          /* size of audio_shuffle table */
  56     int              audio_min_samples[3];  /* min amount of audio samples */
  57                                             /* for 48kHz, 44.1kHz and 32kHz */
  58     int              audio_samples_dist[5]; /* how many samples are supposed to be */
  59                                             /* in each frame in a 5 frames window */
  60     const uint8_t  (*audio_shuffle)[9];     /* PCM shuffling table */
  61 } DVprofile;
  62
  63 const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
  64                                          const uint8_t* frame, unsigned buf_size);
  65 const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
  66
  67 /**
  68  *  Print all allowed DV profiles into logctx at specified logging level.
  69  */
  70 void ff_dv_print_profiles(void *logctx, int loglevel);
  71
  72 #endif /* AVCODEC_DV_PROFILE_H */