| /* |
| * 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 */ |
