|
- /*
- * 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 */
|
