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lavu: add AV_FRAME_DATA_DOWNMIX_INFO side data type.

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This commit is contained in:
Tim Walker 2014-02-15 17:12:22 +00:00
parent 9c0e4b3395
commit c98f3169bf
6 changed files with 164 additions and 1 deletions
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4
doc/APIchanges
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@ -13,6 +13,10 @@ libavutil: 2013-12-xx
API changes, most recent first:
2014-02-xx - xxxxxxx - lavu 53.3.0 - frame.h
Add AV_FRAME_DATA_DOWNMIX_INFO value to the AVFrameSideDataType enum and
downmix_info.h API, which identify downmix-related metadata.
2014-02-04 - d9ae103 - lavf 55.11.0 - avformat.h
Add AVFormatContext.max_interleave_delta for controlling amount of buffering
when interleaving.

2
libavutil/Makefile
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@ -16,6 +16,7 @@ HEADERS = adler32.h \
common.h \
cpu.h \
crc.h \
downmix_info.h \
error.h \
eval.h \
fifo.h \
@ -67,6 +68,7 @@ OBJS = adler32.o \
cpu.o \
crc.o \
des.o \
downmix_info.o \
error.o \
eval.o \
fifo.o \

38
libavutil/downmix_info.c Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (c) 2014 Tim Walker <tdskywalker@gmail.com>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "downmix_info.h"
#include "frame.h"
AVDownmixInfo *av_downmix_info_update_side_data(AVFrame *frame)
{
AVFrameSideData *side_data;
side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_DOWNMIX_INFO);
if (!side_data)
side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_DOWNMIX_INFO,
sizeof(AVDownmixInfo));
if (!side_data)
return NULL;
return (AVDownmixInfo*)side_data->data;
}

114
libavutil/downmix_info.h Normal file
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@ -0,0 +1,114 @@
/*
* Copyright (c) 2014 Tim Walker <tdskywalker@gmail.com>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVUTIL_DOWNMIX_INFO_H
#define AVUTIL_DOWNMIX_INFO_H
#include "frame.h"
/**
* @file
* audio downmix medatata
*/
/**
* @addtogroup lavu_audio
* @{
*/
/**
* @defgroup downmix_info Audio downmix metadata
* @{
*/
/**
* Possible downmix types.
*/
enum AVDownmixType {
AV_DOWNMIX_TYPE_UNKNOWN, /**< Not indicated. */
AV_DOWNMIX_TYPE_LORO, /**< Lo/Ro 2-channel downmix (Stereo). */
AV_DOWNMIX_TYPE_LTRT, /**< Lt/Rt 2-channel downmix, Dolby Surround compatible. */
AV_DOWNMIX_TYPE_DPLII, /**< Lt/Rt 2-channel downmix, Dolby Pro Logic II compatible. */
AV_DOWNMIX_TYPE_NB /**< Number of downmix types. Not part of ABI. */
};
/**
* This structure describes optional metadata relevant to a downmix procedure.
*
* All fields are set by the decoder to the value indicated in the audio
* bitstream (if present), or to a "sane" default otherwise.
*/
typedef struct AVDownmixInfo {
/**
* Type of downmix preferred by the mastering engineer.
*/
enum AVDownmixType preferred_downmix_type;
/**
* Absolute scale factor representing the nominal level of the center
* channel during a regular downmix.
*/
double center_mix_level;
/**
* Absolute scale factor representing the nominal level of the center
* channel during an Lt/Rt compatible downmix.
*/
double center_mix_level_ltrt;
/**
* Absolute scale factor representing the nominal level of the surround
* channels during a regular downmix.
*/
double surround_mix_level;
/**
* Absolute scale factor representing the nominal level of the surround
* channels during an Lt/Rt compatible downmix.
*/
double surround_mix_level_ltrt;
/**
* Absolute scale factor representing the level at which the LFE data is
* mixed into L/R channels during downmixing.
*/
double lfe_mix_level;
} AVDownmixInfo;
/**
* Get a frame's AV_FRAME_DATA_DOWNMIX_INFO side data for editing.
*
* The side data is created and added to the frame if it's absent.
*
* @param frame the frame for which the side data is to be obtained.
*
* @return the AVDownmixInfo structure to be edited by the caller.
*/
AVDownmixInfo *av_downmix_info_update_side_data(AVFrame *frame);
/**
* @}
*/
/**
* @}
*/
#endif /* AVUTIL_DOWNMIX_INFO_H */

5
libavutil/frame.h
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@ -64,6 +64,11 @@ enum AVFrameSideDataType {
* The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
*/
AV_FRAME_DATA_MATRIXENCODING,
/**
* Metadata relevant to a downmix procedure.
* The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
*/
AV_FRAME_DATA_DOWNMIX_INFO,
};
typedef struct AVFrameSideData {

2
libavutil/version.h
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@ -54,7 +54,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 53
#define LIBAVUTIL_VERSION_MINOR 2
#define LIBAVUTIL_VERSION_MINOR 3
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \