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b01a2204b5
The FDK decoder is capable of producing mono and stereo downmix from multichannel streams. These streams may contain metadata that control the downmix process. The decoder requires an Ancillary Buffer in order to correctly apply downmix in streams containing downmix Metadata. The decoder does not have an API interface to inform of the presence of Metadata in the stream, and therefore the Ancillary Buffer is always allocated whenever a downmix is requested. When downmixing multichannel streams, the decoder requires the output buffer in aacDecoder_DecodeFrame call to be of fixed size in order to hold the actual number of channels contained in the stream. For example, for a 5.1ch to stereo downmix, the decoder requires that the output buffer is allocated for 6 channels, regardless of the fact that the output is in fact two channels. Due to this requirement, the output buffer is allocated for the maximum output buffer size in case a downmix is requested (and also during decoder init). When a downmix is requested, the buffer used for output during init will also be used for the entire duration the decoder is open. Otherwise, the initial decoder output buffer is freed and the decoder decodes straight into the output AVFrame. Signed-off-by: Martin Storsjö <martin@martin.st>
164 lines
5.4 KiB
C
164 lines
5.4 KiB
C
/*
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_VERSION_H
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#define AVCODEC_VERSION_H
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/**
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* @file
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* @ingroup libavc
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* Libavcodec version macros.
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*/
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#include "libavutil/version.h"
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#define LIBAVCODEC_VERSION_MAJOR 56
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#define LIBAVCODEC_VERSION_MINOR 5
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#define LIBAVCODEC_VERSION_MICRO 1
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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LIBAVCODEC_VERSION_MINOR, \
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LIBAVCODEC_VERSION_MICRO)
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#define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
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LIBAVCODEC_VERSION_MINOR, \
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LIBAVCODEC_VERSION_MICRO)
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#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
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#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
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/**
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* FF_API_* defines may be placed below to indicate public API that will be
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* dropped at a future version bump. The defines themselves are not part of
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* the public API and may change, break or disappear at any time.
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*/
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#ifndef FF_API_REQUEST_CHANNELS
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#define FF_API_REQUEST_CHANNELS (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_DEINTERLACE
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#define FF_API_DEINTERLACE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_DESTRUCT_PACKET
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#define FF_API_DESTRUCT_PACKET (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_GET_BUFFER
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#define FF_API_GET_BUFFER (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_MISSING_SAMPLE
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#define FF_API_MISSING_SAMPLE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_LOWRES
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#define FF_API_LOWRES (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_CAP_VDPAU
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#define FF_API_CAP_VDPAU (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_BUFS_VDPAU
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#define FF_API_BUFS_VDPAU (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_VOXWARE
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#define FF_API_VOXWARE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_SET_DIMENSIONS
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#define FF_API_SET_DIMENSIONS (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_DEBUG_MV
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#define FF_API_DEBUG_MV (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_AC_VLC
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#define FF_API_AC_VLC (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_OLD_MSMPEG4
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#define FF_API_OLD_MSMPEG4 (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_ASPECT_EXTENDED
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#define FF_API_ASPECT_EXTENDED (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_THREAD_OPAQUE
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#define FF_API_THREAD_OPAQUE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_CODEC_PKT
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#define FF_API_CODEC_PKT (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_ARCH_ALPHA
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#define FF_API_ARCH_ALPHA (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_XVMC
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#define FF_API_XVMC (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_ERROR_RATE
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#define FF_API_ERROR_RATE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_QSCALE_TYPE
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#define FF_API_QSCALE_TYPE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_MB_TYPE
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#define FF_API_MB_TYPE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_MAX_BFRAMES
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#define FF_API_MAX_BFRAMES (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_FAST_MALLOC
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#define FF_API_FAST_MALLOC (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_NEG_LINESIZES
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#define FF_API_NEG_LINESIZES (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_EMU_EDGE
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#define FF_API_EMU_EDGE (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_ARCH_SH4
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#define FF_API_ARCH_SH4 (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_ARCH_SPARC
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#define FF_API_ARCH_SPARC (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_UNUSED_MEMBERS
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#define FF_API_UNUSED_MEMBERS (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_IDCT_XVIDMMX
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#define FF_API_IDCT_XVIDMMX (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_INPUT_PRESERVED
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#define FF_API_INPUT_PRESERVED (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_NORMALIZE_AQP
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#define FF_API_NORMALIZE_AQP (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_GMC
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#define FF_API_GMC (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_MV0
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#define FF_API_MV0 (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_CODEC_NAME
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#define FF_API_CODEC_NAME (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_AFD
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#define FF_API_AFD (LIBAVCODEC_VERSION_MAJOR < 57)
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#endif
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#ifndef FF_API_AUDIOENC_DELAY
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#define FF_API_AUDIOENC_DELAY (LIBAVCODEC_VERSION_MAJOR < 58)
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#endif
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#ifndef FF_API_AVCTX_TIMEBASE
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#define FF_API_AVCTX_TIMEBASE (LIBAVCODEC_VERSION_MAJOR < 59)
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#endif
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#endif /* AVCODEC_VERSION_H */
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