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fa6dce4c57
For the standardized 8 kHz sample rate, this works exactly the same. For nonstandard sample rates, the different predefined G726 names (G726-16, G726-24, G726-32, G726-40) are interpreted as an indication of the bits per coded sample, even though their actual bitrates aren't what the name specifies. This feels more sane than using free-form names for nonstandard sample rate/bitrate combinations, e.g like G726-22, G726-33 for 11025 Hz. Signed-off-by: Martin Storsjö <martin@martin.st>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/*
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* Copyright (c) 2011 Miroslav Slugeň <Thunder.m@seznam.cz>
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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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#include "avformat.h"
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#include "rtpdec_formats.h"
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#define RTP_G726_HANDLER(bitrate) \
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static int g726_ ## bitrate ##_init(AVFormatContext *s, int st_index, PayloadContext *data) \
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{ \
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AVStream *stream = s->streams[st_index]; \
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AVCodecContext *codec = stream->codec; \
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\
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codec->bits_per_coded_sample = bitrate/8; \
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codec->bit_rate = codec->bits_per_coded_sample * codec->sample_rate; \
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\
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return 0; \
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} \
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\
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RTPDynamicProtocolHandler ff_g726_ ## bitrate ## _dynamic_handler = { \
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.enc_name = "G726-" #bitrate, \
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.codec_type = AVMEDIA_TYPE_AUDIO, \
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.codec_id = CODEC_ID_ADPCM_G726, \
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.init = g726_ ## bitrate ## _init, \
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}
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RTP_G726_HANDLER(16);
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RTP_G726_HANDLER(24);
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RTP_G726_HANDLER(32);
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RTP_G726_HANDLER(40);
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