mirror of https://code.videolan.org/videolan/vlc
203 lines
6.9 KiB
C
203 lines
6.9 KiB
C
/*****************************************************************************
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* xa.c : xa file demux module for vlc
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*****************************************************************************
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* Copyright (C) 2005 Rémi Denis-Courmont
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*
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* Authors: Rémi Denis-Courmont
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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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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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vlc_module_begin ()
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set_description( N_("XA demuxer") )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_DEMUX )
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set_capability( "demux", 10 )
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set_callback( Open )
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vlc_module_end ()
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Demux ( demux_t * );
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static int Control( demux_t *, int i_query, va_list args );
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typedef struct
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{
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es_out_id_t *p_es;
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unsigned int i_data_size;
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unsigned int i_block_frames;
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unsigned int i_frame_size;
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unsigned int i_bitrate;
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date_t pts;
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} demux_sys_t;
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typedef struct xa_header_t
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{
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char xa_id[4];
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uint32_t iSize;
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uint16_t wFormatTag;
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uint16_t nChannels;
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uint32_t nSamplesPerSec;
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uint32_t nAvgBytesPerSec;
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uint16_t nBlockAlign;
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uint16_t wBitsPerSample;
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} xa_header_t;
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#define HEADER_LENGTH 24
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static_assert(offsetof(xa_header_t, wBitsPerSample) == 22, "Bad padding");
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#define FRAME_LENGTH 28 /* samples per frame */
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/*****************************************************************************
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* Open: check file and initializes structures
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*****************************************************************************/
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static int Open( vlc_object_t * p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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const uint8_t *peek;
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/* XA file heuristic */
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if( vlc_stream_Peek( p_demux->s, &peek, 10 ) < 10 )
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return VLC_EGENERIC;
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if( memcmp( peek, "XAI", 4 ) && memcmp( peek, "XAJ", 4 ) &&
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memcmp( peek, "XA\0", 4 ) )
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return VLC_EGENERIC;
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if( GetWLE( peek + 8 ) != 1 ) /* format tag */
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return VLC_EGENERIC;
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demux_sys_t *p_sys = vlc_obj_malloc( p_this, sizeof (*p_sys) );
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if( unlikely( p_sys == NULL ) )
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return VLC_ENOMEM;
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/* read XA header*/
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xa_header_t xa;
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if( vlc_stream_Read( p_demux->s, &xa, HEADER_LENGTH ) < HEADER_LENGTH )
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return VLC_EGENERIC;
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es_format_t fmt;
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es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_ADPCM_XA_EA );
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msg_Dbg( p_demux, "assuming EA ADPCM audio codec" );
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fmt.audio.i_rate = GetDWLE( &xa.nSamplesPerSec );
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fmt.audio.i_bytes_per_frame = 15 * GetWLE( &xa.nChannels );
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fmt.audio.i_frame_length = FRAME_LENGTH;
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fmt.audio.i_channels = GetWLE ( &xa.nChannels );
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fmt.audio.i_blockalign = fmt.audio.i_bytes_per_frame;
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fmt.audio.i_bitspersample = GetWLE( &xa.wBitsPerSample );
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fmt.i_bitrate = (fmt.audio.i_rate * fmt.audio.i_bytes_per_frame * 8)
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/ fmt.audio.i_frame_length;
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/* FIXME: better computation */
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p_sys->i_data_size = xa.iSize * 15 / 56;
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/* How many frames per block (1:1 is too CPU intensive) */
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p_sys->i_block_frames = fmt.audio.i_rate / (FRAME_LENGTH * 20) + 1;
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p_sys->i_frame_size = fmt.audio.i_bytes_per_frame;
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p_sys->i_bitrate = fmt.i_bitrate;
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msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
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"freq: %d Hz, bitrate: %dKo/s, blockalign: %d",
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(char *)&fmt.i_codec, fmt.audio.i_channels, fmt.audio.i_rate,
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fmt.i_bitrate / 8192, fmt.audio.i_blockalign );
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if( fmt.audio.i_rate == 0 || fmt.audio.i_channels == 0
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|| fmt.audio.i_bitspersample != 16 )
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return VLC_EGENERIC;
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p_sys->p_es = es_out_Add( p_demux->out, &fmt );
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if( unlikely(p_sys->p_es == NULL) )
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return VLC_ENOMEM;
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date_Init( &p_sys->pts, fmt.audio.i_rate, 1 );
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date_Set( &p_sys->pts, VLC_TICK_0 );
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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p_demux->p_sys = p_sys;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Demux: read packet and send them to decoders
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
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*****************************************************************************/
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static int Demux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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block_t *p_block;
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int64_t i_offset = vlc_stream_Tell( p_demux->s );
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unsigned i_frames = p_sys->i_block_frames;
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if( p_sys->i_data_size > 0 &&
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(i_offset - HEADER_LENGTH) >= p_sys->i_data_size )
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{
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return VLC_DEMUXER_EOF;
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}
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p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size * i_frames );
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if( p_block == NULL )
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{
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msg_Warn( p_demux, "cannot read data" );
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return VLC_DEMUXER_EOF;
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}
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i_frames = p_block->i_buffer / p_sys->i_frame_size;
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p_block->i_dts = p_block->i_pts = date_Get( &p_sys->pts );
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es_out_SetPCR( p_demux->out, p_block->i_pts );
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es_out_Send( p_demux->out, p_sys->p_es, p_block );
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date_Increment( &p_sys->pts, i_frames * FRAME_LENGTH );
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return VLC_DEMUXER_SUCCESS;
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}
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/*****************************************************************************
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* Control:
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*****************************************************************************/
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static int Control( demux_t *p_demux, int i_query, va_list args )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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return demux_vaControlHelper( p_demux->s, HEADER_LENGTH,
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p_sys->i_data_size ? (int64_t)HEADER_LENGTH + p_sys->i_data_size : -1,
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p_sys->i_bitrate, p_sys->i_frame_size,
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i_query, args );
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}
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