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83 lines
3.6 KiB
83 lines
3.6 KiB
/* |
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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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