dv_profile.h (3694B)
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 27 /* minimum number of bytes to read from a DV stream in order to 28 * determine the profile */ 29 #define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */ 30 31 32 /* 33 * AVDVProfile is used to express the differences between various 34 * DV flavors. For now it's primarily used for differentiating 35 * 525/60 and 625/50, but the plans are to use it for various 36 * DV specs as well (e.g. SMPTE314M vs. IEC 61834). 37 */ 38 typedef struct AVDVProfile { 39 int dsf; /* value of the dsf in the DV header */ 40 int video_stype; /* stype for VAUX source pack */ 41 int frame_size; /* total size of one frame in bytes */ 42 int difseg_size; /* number of DIF segments per DIF channel */ 43 int n_difchan; /* number of DIF channels per frame */ 44 AVRational time_base; /* 1/framerate */ 45 int ltc_divisor; /* FPS from the LTS standpoint */ 46 int height; /* picture height in pixels */ 47 int width; /* picture width in pixels */ 48 AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */ 49 enum AVPixelFormat pix_fmt; /* picture pixel format */ 50 int bpm; /* blocks per macroblock */ 51 const uint8_t *block_sizes; /* AC block sizes, in bits */ 52 int audio_stride; /* size of audio_shuffle table */ 53 int audio_min_samples[3]; /* min amount of audio samples */ 54 /* for 48kHz, 44.1kHz and 32kHz */ 55 int audio_samples_dist[5]; /* how many samples are supposed to be */ 56 /* in each frame in a 5 frames window */ 57 const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */ 58 } AVDVProfile; 59 60 /** 61 * Get a DV profile for the provided compressed frame. 62 * 63 * @param sys the profile used for the previous frame, may be NULL 64 * @param frame the compressed data buffer 65 * @param buf_size size of the buffer in bytes 66 * @return the DV profile for the supplied data or NULL on failure 67 */ 68 const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys, 69 const uint8_t *frame, unsigned buf_size); 70 71 /** 72 * Get a DV profile for the provided stream parameters. 73 */ 74 const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt); 75 76 /** 77 * Get a DV profile for the provided stream parameters. 78 * The frame rate is used as a best-effort parameter. 79 */ 80 const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate); 81 82 #endif /* AVCODEC_DV_PROFILE_H */