/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_DV_PROFILE_H #define AVCODEC_DV_PROFILE_H #include <stdint.h> #include "libavutil/pixfmt.h" #include "libavutil/rational.h" #include "avcodec.h" /* minimum number of bytes to read from a DV stream in order to * determine the profile */ #define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */ /* * AVDVProfile is used to express the differences between various * DV flavors. For now it's primarily used for differentiating * 525/60 and 625/50, but the plans are to use it for various * DV specs as well (e.g. SMPTE314M vs. IEC 61834). */ typedef struct AVDVProfile { int dsf; /* value of the dsf in the DV header */ int video_stype; /* stype for VAUX source pack */ int frame_size; /* total size of one frame in bytes */ int difseg_size; /* number of DIF segments per DIF channel */ int n_difchan; /* number of DIF channels per frame */ AVRational time_base; /* 1/framerate */ int ltc_divisor; /* FPS from the LTS standpoint */ int height; /* picture height in pixels */ int width; /* picture width in pixels */ AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */ enum AVPixelFormat pix_fmt; /* picture pixel format */ int bpm; /* blocks per macroblock */ const uint8_t *block_sizes; /* AC block sizes, in bits */ int audio_stride; /* size of audio_shuffle table */ int audio_min_samples[3]; /* min amount of audio samples */ /* for 48kHz, 44.1kHz and 32kHz */ int audio_samples_dist[5]; /* how many samples are supposed to be */ /* in each frame in a 5 frames window */ const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */ } AVDVProfile; /** * Get a DV profile for the provided compressed frame. * * @param sys the profile used for the previous frame, may be NULL * @param frame the compressed data buffer * @param buf_size size of the buffer in bytes * @return the DV profile for the supplied data or NULL on failure */ const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys, const uint8_t *frame, unsigned buf_size); /** * Get a DV profile for the provided stream parameters. */ const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt); /** * Get a DV profile for the provided stream parameters. * The frame rate is used as a best-effort parameter. */ const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate); #endif /* AVCODEC_DV_PROFILE_H */