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