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| | |
| | | /* |
| | | * 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 */ |