* aac.c : big clean up and use ninput.h
authorLaurent Aimar <fenrir@videolan.org>
Fri, 1 Aug 2003 00:08:35 +0000 (00:08 +0000)
committerLaurent Aimar <fenrir@videolan.org>
Fri, 1 Aug 2003 00:08:35 +0000 (00:08 +0000)
modules/demux/aac.c [new file with mode: 0644]

diff --git a/modules/demux/aac.c b/modules/demux/aac.c
new file mode 100644 (file)
index 0000000..b3b931b
--- /dev/null
@@ -0,0 +1,324 @@
+/*****************************************************************************
+ * aac.c : Raw aac Stream input module for vlc
+ *****************************************************************************
+ * Copyright (C) 2001 VideoLAN
+ * $Id: aac.c,v 1.1 2003/08/01 00:08:35 fenrir Exp $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h>                                      /* malloc(), free() */
+
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+
+#include <ninput.h>
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+
+static int  Activate    ( vlc_object_t * );
+static void Deactivate  ( vlc_object_t * );
+
+vlc_module_begin();
+    set_description( _("AAC demuxer" ) );
+    set_capability( "demux", 10 );
+    set_callbacks( Activate, Deactivate );
+    add_shortcut( "aac" );
+vlc_module_end();
+
+/* TODO:
+ * - adif support ?
+ *
+ */
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+
+static int  Demux       ( input_thread_t * );
+
+struct demux_sys_t
+{
+    stream_t        *s;
+    mtime_t         i_time;
+
+    es_descriptor_t *p_es;
+};
+
+static int i_aac_samplerate[16] =
+{
+    96000, 88200, 64000, 48000, 44100, 32000, 
+    24000, 22050, 16000, 12000, 11025, 8000,
+    7350,  0,     0,     0
+};
+
+#define AAC_ID( p )          ( ((p)[1]>>3)&0x01 )
+#define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
+#define AAC_CHANNELS( p )    ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
+#define AAC_FRAME_SIZE( p )  ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
+/* FIXME it's plain wrong */
+#define AAC_FRAME_SAMPLES( p )  1024
+
+static inline int HeaderCheck( uint8_t *p )
+{
+    if( p[0] != 0xff ||
+        ( p[1]&0xf6 ) != 0xf0 ||
+        AAC_SAMPLE_RATE( p ) == 0 ||
+        AAC_CHANNELS( p ) == 0 ||
+        AAC_FRAME_SIZE( p ) == 0 )
+    {
+        return VLC_FALSE;
+    }
+    return VLC_TRUE;
+}
+
+
+/*****************************************************************************
+ * Activate: initializes AAC demux structures
+ *****************************************************************************/
+static int Activate( vlc_object_t * p_this )
+{
+    input_thread_t *p_input = (input_thread_t *)p_this;
+    demux_sys_t    *p_sys;
+    int            b_forced = VLC_FALSE;
+
+    uint8_t        *p_peek;
+
+    module_t       *p_id3;
+
+
+    if( p_input->psz_demux && !strncmp( p_input->psz_demux, "aac", 3 ) )
+    {
+        b_forced = VLC_TRUE;
+    }
+
+    if( p_input->psz_name )
+    {
+        int  i_len = strlen( p_input->psz_name );
+
+        if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".aac" ) )
+        {
+            b_forced = VLC_TRUE;
+        }
+    }
+
+    if( !b_forced )
+    {
+        /* I haven't find any sure working aac detection so only forced or
+         * extention check
+         */
+        msg_Warn( p_input, "AAC module discarded" );
+        return VLC_EGENERIC;
+    }
+
+    /* skip possible id3 header */
+    p_id3 = module_Need( p_input, "id3", NULL );
+    if ( p_id3 )
+    {
+        module_Unneed( p_input, p_id3 );
+    }
+
+    p_input->pf_demux = Demux;
+
+    p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
+    p_sys->i_time = 0;
+
+    if( ( p_sys->s = stream_OpenInput( p_input ) ) == NULL )
+    {
+        msg_Err( p_input, "cannot create stream" );
+        goto error;
+    }
+
+    /* peek the begining (10 is for adts header) */
+    if( stream_Peek( p_sys->s, &p_peek, 10 ) < 10 )
+    {
+        msg_Err( p_input, "cannot peek" );
+        goto error;
+    }
+
+    if( !strncmp( p_peek, "ADIF", 4 ) )
+    {
+        msg_Err( p_input, "ADIF file. Not yet supported. (Please report)" );
+        goto error;
+    }
+
+    if( HeaderCheck( p_peek ) )
+    {
+        input_info_category_t * p_category;
+        msg_Dbg( p_input,
+                 "adts header: id=%d channels=%d sample_rate=%d",
+                 AAC_ID( p_peek ),
+                 AAC_CHANNELS( p_peek ),
+                 AAC_SAMPLE_RATE( p_peek ) );
+
+        vlc_mutex_lock( &p_input->stream.stream_lock );
+
+        p_category = input_InfoCategory( p_input, _("Aac") );
+
+        input_AddInfo( p_category, _("Input Type"), "MPEG-%d AAC",
+                       AAC_ID( p_peek ) == 1 ? 2 : 4 );
+        input_AddInfo( p_category, _("Channels"), "%d",
+                       AAC_CHANNELS( p_peek ) );
+        input_AddInfo( p_category, _("Sample Rate"), "%dHz",
+                       AAC_SAMPLE_RATE( p_peek ) );
+
+        vlc_mutex_unlock( &p_input->stream.stream_lock );
+    }
+
+    vlc_mutex_lock( &p_input->stream.stream_lock );
+    if( input_InitStream( p_input, 0 ) == -1)
+    {
+        vlc_mutex_unlock( &p_input->stream.stream_lock );
+        msg_Err( p_input, "cannot init stream" );
+        goto error;
+    }
+    if( input_AddProgram( p_input, 0, 0) == NULL )
+    {
+        vlc_mutex_unlock( &p_input->stream.stream_lock );
+        msg_Err( p_input, "cannot add program" );
+        goto error;
+    }
+    p_input->stream.pp_programs[0]->b_is_ok = 0;
+    p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
+
+    p_input->stream.i_mux_rate = 0 / 50;
+
+    p_sys->p_es = input_AddES( p_input,
+                               p_input->stream.p_selected_program,
+                               1 , AUDIO_ES, NULL, 0 );
+
+    p_sys->p_es->i_stream_id = 1;
+    p_sys->p_es->i_fourcc = VLC_FOURCC( 'm', 'p', '4', 'a' );
+    input_SelectES( p_input, p_sys->p_es );
+
+    p_input->stream.p_selected_program->b_is_ok = 1;
+    vlc_mutex_unlock( &p_input->stream.stream_lock );
+
+    return VLC_SUCCESS;
+
+error:
+    if( p_sys->s )
+    {
+        stream_Release( p_sys->s );
+    }
+    free( p_sys );
+    return VLC_EGENERIC;
+}
+
+
+/*****************************************************************************
+ * Demux: reads and demuxes data packets
+ *****************************************************************************
+ * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
+ *****************************************************************************/
+static int Demux( input_thread_t * p_input )
+{
+    demux_sys_t  *p_sys = p_input->p_demux_data;
+    pes_packet_t *p_pes;
+
+    uint8_t      h[8];
+    uint8_t      *p_peek;
+
+    if( stream_Peek( p_sys->s, &p_peek, 8 ) < 8 )
+    {
+        msg_Warn( p_input, "cannot peek" );
+        return 0;
+    }
+
+    if( !HeaderCheck( p_peek ) )
+    {
+        /* we need to resynch */
+        vlc_bool_t  b_ok = VLC_FALSE;
+        int         i_skip = 0;
+        int         i_peek;
+
+        i_peek = stream_Peek( p_sys->s, &p_peek, 8096 );
+        if( i_peek < 8 )
+        {
+            msg_Warn( p_input, "cannot peek" );
+            return 0;
+        }
+
+        while( i_peek >= 8 )
+        {
+            if( HeaderCheck( p_peek ) )
+            {
+                b_ok = VLC_TRUE;
+                break;
+            }
+
+            p_peek++;
+            i_peek--;
+            i_skip++;
+        }
+
+        msg_Warn( p_input, "garbage=%d bytes", i_skip );
+        stream_Read( p_sys->s, NULL, i_skip );
+        return 1;
+    }
+
+    memcpy( h, p_peek, 8 );    /* can't use p_peek after stream_*  */
+
+    input_ClockManageRef( p_input,
+                          p_input->stream.p_selected_program,
+                          p_sys->i_time * 9 / 100 );
+
+    if( ( p_pes = stream_PesPacket( p_sys->s, AAC_FRAME_SIZE( h ) ) ) == NULL )
+    {
+        msg_Warn( p_input, "cannot read data" );
+        return 0;
+    }
+
+    p_pes->i_dts =
+    p_pes->i_pts = input_ClockGetTS( p_input,
+                                     p_input->stream.p_selected_program,
+                                     p_sys->i_time * 9 / 100 );
+
+    if( !p_sys->p_es->p_decoder_fifo )
+    {
+        msg_Err( p_input, "no audio decoder" );
+        input_DeletePES( p_input->p_method_data, p_pes );
+        return( -1 );
+    }
+
+    input_DecodePES( p_sys->p_es->p_decoder_fifo, p_pes );
+    p_sys->i_time += (mtime_t)1000000 *
+                     (mtime_t)AAC_FRAME_SAMPLES( h ) /
+                     (mtime_t)AAC_SAMPLE_RATE( h );
+    return( 1 );
+}
+
+/*****************************************************************************
+ * Deactivate: frees unused data
+ *****************************************************************************/
+static void Deactivate( vlc_object_t * p_this )
+{
+    input_thread_t *p_input = (input_thread_t*)p_this;
+    demux_sys_t    *p_sys = p_input->p_demux_data;
+
+    if( p_sys->s )
+    {
+        stream_Release( p_sys->s );
+    }
+    free( p_sys );
+}
+