mirror of https://code.videolan.org/videolan/vlc
mpegaudio: split frame header parsing code
This moves the function to a header for reuse. No functional changes.
This commit is contained in:
Rémi Denis-Courmont
parent
841c152223
commit
ffb558023d
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@ -13,7 +13,8 @@ libpacketizer_mpeg4video_plugin_la_SOURCES = packetizer/mpeg4video.c \
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libpacketizer_mjpeg_plugin_la_SOURCES = packetizer/mjpeg.c
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libpacketizer_mpeg4audio_plugin_la_SOURCES = packetizer/mpeg4audio.c \
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packetizer/mpeg4audio.h
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libpacketizer_mpegaudio_plugin_la_SOURCES = packetizer/mpegaudio.c
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libpacketizer_mpegaudio_plugin_la_SOURCES = \
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packetizer/mpegaudio.c packetizer/mpegaudio.h
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libpacketizer_h264_plugin_la_SOURCES = \
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packetizer/h264_nal.c packetizer/h264_nal.h \
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packetizer/h264_slice.c packetizer/h264_slice.h \
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@ -40,6 +40,7 @@
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#include <vlc_block_helper.h>
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#include "packetizer_helper.h"
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#include "mpegaudio.h"
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/*****************************************************************************
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* decoder_sys_t : decoder descriptor
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@ -145,136 +146,6 @@ static uint8_t *GetOutBuffer( decoder_t *p_dec, block_t **pp_out_buffer )
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return p_block->p_buffer;
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}
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/*****************************************************************************
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* SyncInfo: parse MPEG audio sync info
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*****************************************************************************/
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static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
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unsigned int * pi_channels_conf,
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unsigned int * pi_chan_mode,
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unsigned int * pi_sample_rate, unsigned int * pi_bit_rate,
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unsigned int * pi_frame_length,
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unsigned int * pi_max_frame_size, unsigned int * pi_layer)
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{
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static const int ppi_bitrate[2][3][16] =
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{
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{
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/* v1 l1 */
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{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384,
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416, 448, 0},
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/* v1 l2 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256,
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320, 384, 0},
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/* v1 l3 */
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224,
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256, 320, 0}
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},
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{
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/* v2 l1 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192,
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224, 256, 0},
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/* v2 l2 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 0},
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/* v2 l3 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 0}
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}
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};
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static const int ppi_samplerate[2][4] = /* version 1 then 2 */
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{
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{ 44100, 48000, 32000, 0 },
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{ 22050, 24000, 16000, 0 }
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};
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int i_version, i_mode, i_emphasis;
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bool b_padding, b_mpeg_2_5;
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int i_frame_size = 0;
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int i_bitrate_index, i_samplerate_index;
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int i_max_bit_rate;
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b_mpeg_2_5 = 1 - ((i_header & 0x100000) >> 20);
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i_version = 1 - ((i_header & 0x80000) >> 19);
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*pi_layer = 4 - ((i_header & 0x60000) >> 17);
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//bool b_crc = !((i_header >> 16) & 0x01);
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i_bitrate_index = (i_header & 0xf000) >> 12;
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i_samplerate_index = (i_header & 0xc00) >> 10;
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b_padding = (i_header & 0x200) >> 9;
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/* Extension */
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i_mode = (i_header & 0xc0) >> 6;
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/* Modeext, copyright & original */
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i_emphasis = i_header & 0x3;
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*pi_chan_mode = 0;
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if( *pi_layer != 4 &&
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i_bitrate_index < 0x0f &&
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i_samplerate_index != 0x03 &&
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i_emphasis != 0x02 )
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{
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switch ( i_mode )
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{
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case 2: /* dual-mono */
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*pi_chan_mode = AOUT_CHANMODE_DUALMONO;
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/* fall through */
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case 0: /* stereo */
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case 1: /* joint stereo */
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*pi_channels = 2;
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*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
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break;
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case 3: /* mono */
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*pi_channels = 1;
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*pi_channels_conf = AOUT_CHAN_CENTER;
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break;
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}
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*pi_bit_rate = ppi_bitrate[i_version][*pi_layer-1][i_bitrate_index];
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i_max_bit_rate = ppi_bitrate[i_version][*pi_layer-1][14];
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*pi_sample_rate = ppi_samplerate[i_version][i_samplerate_index];
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if ( b_mpeg_2_5 )
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{
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*pi_sample_rate >>= 1;
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}
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switch( *pi_layer )
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{
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case 1:
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i_frame_size = ( 12000 * *pi_bit_rate / *pi_sample_rate +
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b_padding ) * 4;
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*pi_max_frame_size = ( 12000 * i_max_bit_rate /
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*pi_sample_rate + 1 ) * 4;
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*pi_frame_length = 384;
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break;
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case 2:
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i_frame_size = 144000 * *pi_bit_rate / *pi_sample_rate + b_padding;
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*pi_max_frame_size = 144000 * i_max_bit_rate / *pi_sample_rate + 1;
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*pi_frame_length = 1152;
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break;
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case 3:
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i_frame_size = ( i_version ? 72000 : 144000 ) *
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*pi_bit_rate / *pi_sample_rate + b_padding;
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*pi_max_frame_size = ( i_version ? 72000 : 144000 ) *
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i_max_bit_rate / *pi_sample_rate + 1;
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*pi_frame_length = i_version ? 576 : 1152;
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break;
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default:
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break;
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}
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/* Free bitrate mode can support higher bitrates */
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if( !*pi_bit_rate ) *pi_max_frame_size *= 2;
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}
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else
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{
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return -1;
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}
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return i_frame_size;
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}
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/****************************************************************************
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* DecodeBlock: the whole thing
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****************************************************************************
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@ -0,0 +1,154 @@
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/*****************************************************************************
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* mpegaudio.h:
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*****************************************************************************
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* Copyright (C) 2001-2016 VLC authors and VideoLAN
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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* Eric Petit <titer@videolan.org>
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* Christophe Massiot <massiot@via.ecp.fr>
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* Gildas Bazin <gbazin@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU 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 License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include <stdbool.h>
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#include <stdint.h>
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/*****************************************************************************
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* SyncInfo: parse MPEG audio sync info
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*****************************************************************************/
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static int SyncInfo(uint32_t i_header, unsigned int *pi_channels,
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unsigned int *pi_channels_conf,
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unsigned int *pi_chan_mode,
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unsigned int *pi_sample_rate, unsigned int *pi_bit_rate,
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unsigned int *pi_frame_length,
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unsigned int *pi_max_frame_size, unsigned int *pi_layer)
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{
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static const int ppi_bitrate[2][3][16] =
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{
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{
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/* v1 l1 */
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{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384,
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416, 448, 0},
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/* v1 l2 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256,
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320, 384, 0},
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/* v1 l3 */
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224,
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256, 320, 0}
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},
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{
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/* v2 l1 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192,
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224, 256, 0},
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/* v2 l2 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 0},
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/* v2 l3 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 0}
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}
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};
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static const int ppi_samplerate[2][4] = /* version 1 then 2 */
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{
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{ 44100, 48000, 32000, 0 },
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{ 22050, 24000, 16000, 0 }
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};
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int i_frame_size = 0;
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bool b_mpeg_2_5 = 1 - ((i_header & 0x100000) >> 20);
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int i_version = 1 - ((i_header & 0x80000) >> 19);
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*pi_layer = 4 - ((i_header & 0x60000) >> 17);
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//bool b_crc = !((i_header >> 16) & 0x01);
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int i_bitrate_index = (i_header & 0xf000) >> 12;
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int i_samplerate_index = (i_header & 0xc00) >> 10;
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bool b_padding = (i_header & 0x200) >> 9;
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/* Extension */
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int i_mode = (i_header & 0xc0) >> 6;
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/* Modeext, copyright & original */
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int i_emphasis = i_header & 0x3;
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*pi_chan_mode = 0;
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if (*pi_layer != 4 &&
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i_bitrate_index < 0x0f &&
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i_samplerate_index != 0x03 &&
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i_emphasis != 0x02)
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{
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switch (i_mode)
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{
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case 2: /* dual-mono */
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*pi_chan_mode = AOUT_CHANMODE_DUALMONO;
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/* fall through */
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case 0: /* stereo */
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case 1: /* joint stereo */
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*pi_channels = 2;
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*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
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break;
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case 3: /* mono */
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*pi_channels = 1;
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*pi_channels_conf = AOUT_CHAN_CENTER;
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break;
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}
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int i_max_bit_rate = ppi_bitrate[i_version][*pi_layer-1][14];
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*pi_bit_rate = ppi_bitrate[i_version][*pi_layer-1][i_bitrate_index];
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*pi_sample_rate = ppi_samplerate[i_version][i_samplerate_index];
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if (b_mpeg_2_5)
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*pi_sample_rate /= 2;
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switch (*pi_layer)
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{
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case 1:
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i_frame_size = (12000 * *pi_bit_rate / *pi_sample_rate +
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b_padding) * 4;
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*pi_max_frame_size = (12000 * i_max_bit_rate /
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*pi_sample_rate + 1) * 4;
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*pi_frame_length = 384;
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break;
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case 2:
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i_frame_size = 144000 * *pi_bit_rate / *pi_sample_rate +
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b_padding;
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*pi_max_frame_size = 144000 * i_max_bit_rate /
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*pi_sample_rate + 1;
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*pi_frame_length = 1152;
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break;
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case 3:
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i_frame_size = (i_version ? 72000 : 144000) *
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*pi_bit_rate / *pi_sample_rate + b_padding;
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*pi_max_frame_size = (i_version ? 72000 : 144000) *
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i_max_bit_rate / *pi_sample_rate + 1;
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*pi_frame_length = i_version ? 576 : 1152;
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break;
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default:
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break;
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}
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/* Free bitrate mode can support higher bitrates */
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if (*pi_bit_rate == 0)
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*pi_max_frame_size *= 2;
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}
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else
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return -1;
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return i_frame_size;
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}
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