--- /dev/null
+/*****************************************************************************
+ * ugly.c : ugly resampler (changes pitch)
+ *****************************************************************************
+ * Copyright (C) 2002 VideoLAN
+ * $Id: coreaudio.c,v 1.1 2003/03/30 01:13:37 massiot Exp $
+ *
+ * Authors: Samuel Hocevar <sam@zoy.org>
+ *
+ * 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 <string.h>
+
+#include <AudioToolbox/AudioConverter.h>
+
+#include <vlc/vlc.h>
+#include "audio_output.h"
+#include "aout_internal.h"
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Create ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+
+static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+/*****************************************************************************
+ * Local structures
+ *****************************************************************************/
+struct aout_filter_sys_t
+{
+ aout_filter_t * p_secondary_resampler;
+ aout_alloc_t alloc;
+
+ AudioStreamBasicDescription s_src_stream_format;
+ AudioStreamBasicDescription s_dst_stream_format;
+ AudioConverterRef s_converter;
+ unsigned int i_first_rate;
+};
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+ set_description( _("audio filter for ugly resampling") );
+ set_capability( "audio filter", 50 );
+ set_callbacks( Create, Close );
+vlc_module_end();
+
+/*****************************************************************************
+ * Create: allocate ugly resampler
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+ struct aout_filter_sys_t * p_sys = p_filter->p_sys;
+ unsigned int i_nb_channels;
+ OSStatus err;
+ uint32_t i_prop;
+ unsigned int i_first_rate;
+
+ if ( p_filter->input.i_rate == p_filter->output.i_rate
+ || p_filter->input.i_format != p_filter->output.i_format
+ || p_filter->input.i_physical_channels
+ != p_filter->output.i_physical_channels
+ || p_filter->input.i_original_channels
+ != p_filter->output.i_original_channels
+ || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
+ {
+ return VLC_EGENERIC;
+ }
+
+ if ( p_filter->input.i_rate >= 48000 * (100 + AOUT_MAX_RESAMPLING) / 100 )
+ i_first_rate = 48000;
+ else
+ i_first_rate = 44100;
+ if ( p_filter->output.i_rate == i_first_rate )
+ {
+ return VLC_EGENERIC;
+ }
+
+ i_nb_channels = aout_FormatNbChannels( &p_filter->input );
+
+ /* Allocate the memory needed to store the module's structure */
+ p_sys = p_filter->p_sys = malloc( sizeof(struct aout_filter_sys_t) );
+ if( p_filter->p_sys == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return VLC_ENOMEM;
+ }
+ memset( p_filter->p_sys, 0, sizeof(struct aout_filter_sys_t) );
+ p_sys->i_first_rate = i_first_rate;
+
+ p_sys->s_src_stream_format.mFormatID = kAudioFormatLinearPCM;
+ p_sys->s_src_stream_format.mFormatFlags
+ = kLinearPCMFormatFlagIsFloat | kAudioFormatFlagsNativeEndian
+ | kAudioFormatFlagIsPacked;
+ p_sys->s_src_stream_format.mBytesPerPacket = i_nb_channels * 4;
+ p_sys->s_src_stream_format.mFramesPerPacket = 1;
+ p_sys->s_src_stream_format.mBytesPerFrame = i_nb_channels * 4;
+ p_sys->s_src_stream_format.mChannelsPerFrame = i_nb_channels;
+ p_sys->s_src_stream_format.mBitsPerChannel = 32;
+
+ memcpy( &p_sys->s_dst_stream_format, &p_sys->s_src_stream_format,
+ sizeof(AudioStreamBasicDescription) );
+
+ p_sys->s_src_stream_format.mSampleRate = p_sys->i_first_rate;
+ p_sys->s_dst_stream_format.mSampleRate = p_filter->output.i_rate;
+
+ err = AudioConverterNew( &p_sys->s_src_stream_format,
+ &p_sys->s_dst_stream_format,
+ &p_sys->s_converter );
+
+ if( err != noErr )
+ {
+ msg_Err( p_filter, "AudioConverterNew failed: [%4.4s]",
+ (char *)&err );
+ free(p_sys);
+ return VLC_EGENERIC;
+ }
+
+ i_prop = kConverterPrimeMethod_None;
+ err = AudioConverterSetProperty( p_sys->s_converter,
+ kAudioConverterPrimeMethod, sizeof(i_prop), &i_prop );
+
+ if( err != noErr )
+ {
+ msg_Err( p_filter, "AudioConverterSetProperty failed: [%4.4s]",
+ (char *)&err );
+ free(p_sys);
+ return VLC_EGENERIC;
+ }
+
+ /* Allocate a secondary resampler for the remainder. */
+ p_sys->p_secondary_resampler = vlc_object_create( p_filter,
+ sizeof(aout_filter_t) );
+ if ( p_sys->p_secondary_resampler == NULL )
+ {
+ free(p_sys);
+ return VLC_EGENERIC;
+ }
+ vlc_object_attach( p_sys->p_secondary_resampler, p_filter );
+
+ memcpy( &p_sys->p_secondary_resampler->input, &p_filter->input,
+ sizeof(audio_sample_format_t) );
+ memcpy( &p_sys->p_secondary_resampler->output, &p_filter->output,
+ sizeof(audio_sample_format_t) );
+ p_sys->p_secondary_resampler->p_module
+ = module_Need( p_sys->p_secondary_resampler, "audio filter",
+ "ugly_resampler" );
+ if ( p_sys->p_secondary_resampler->p_module == NULL )
+ {
+ vlc_object_detach( p_sys->p_secondary_resampler );
+ vlc_object_destroy( p_sys->p_secondary_resampler );
+ free(p_sys);
+ return VLC_EGENERIC;
+ }
+ p_sys->p_secondary_resampler->b_continuity = VLC_FALSE;
+ p_sys->alloc.i_alloc_type = AOUT_ALLOC_STACK;
+ p_sys->alloc.i_bytes_per_sec = p_filter->output.i_bytes_per_frame
+ * p_filter->output.i_rate
+ / p_filter->output.i_frame_length;
+
+ p_filter->pf_do_work = DoWork;
+
+ /* We don't want a new buffer to be created because we're not sure we'll
+ * actually need to resample anything. */
+ p_filter->b_in_place = VLC_FALSE;
+
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Close: free our resources
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+ struct aout_filter_sys_t * p_sys = p_filter->p_sys;
+ OSErr err;
+
+ module_Unneed( p_sys->p_secondary_resampler,
+ p_sys->p_secondary_resampler->p_module );
+ vlc_object_detach( p_sys->p_secondary_resampler );
+ vlc_object_destroy( p_sys->p_secondary_resampler );
+
+ /* Destroy the AudioConverter */
+ err = AudioConverterDispose( p_sys->s_converter );
+
+ if( err != noErr )
+ {
+ msg_Err( p_this, "AudioConverterDispose failed: %u", err );
+ }
+
+ free( p_filter->p_sys );
+}
+
+/*****************************************************************************
+ * DoWork: convert a buffer
+ *****************************************************************************/
+static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ struct aout_filter_sys_t * p_sys = p_filter->p_sys;
+ int32_t *p_in = (int32_t *)p_in_buf->p_buffer;
+ int32_t *p_out;
+ UInt32 i_output_size;
+ unsigned int i_out_nb, i_wanted_nb, i_new_rate;
+ OSErr err;
+ aout_buffer_t * p_middle_buf;
+
+ unsigned int i_nb_channels = aout_FormatNbChannels( &p_filter->input );
+
+#if 1
+ if ( !p_filter->b_continuity )
+ {
+ err = AudioConverterReset( p_sys->s_converter );
+ if( err != noErr )
+ {
+ msg_Err( p_filter, "AudioConverterReset failed: [%4.4s]",
+ (char *)&err );
+ }
+ p_filter->b_continuity = VLC_TRUE;
+ }
+#endif
+
+ i_out_nb = p_in_buf->i_nb_samples * p_filter->output.i_rate
+ / p_sys->i_first_rate;
+
+ i_output_size = i_out_nb * 4 * i_nb_channels;
+ if ( i_output_size > p_out_buf->i_size )
+ {
+ aout_BufferAlloc( &p_sys->alloc,
+ i_out_nb * 1000000 / p_filter->output.i_rate,
+ NULL, p_middle_buf );
+ }
+ else
+ {
+ p_middle_buf = p_out_buf;
+ }
+ p_out = (int32_t*)p_middle_buf->p_buffer;
+ err = AudioConverterConvertBuffer( p_sys->s_converter,
+ p_in_buf->i_nb_samples * 4 * i_nb_channels, p_in,
+ &i_output_size, p_out );
+ if( err != noErr )
+ {
+ msg_Warn( p_filter, "AudioConverterConvertBuffer failed: [%4.4s] (%u:%u)",
+ (char *)&err, i_out_nb * 4 * i_nb_channels, i_output_size );
+ i_output_size = i_out_nb * 4 * i_nb_channels;
+ memset( p_out, 0, i_output_size );
+ }
+
+ p_middle_buf->i_nb_samples = i_output_size / 4 / i_nb_channels;
+ p_middle_buf->i_nb_bytes = i_output_size;
+ p_middle_buf->start_date = p_in_buf->start_date;
+ p_middle_buf->end_date = p_middle_buf->start_date + p_middle_buf->i_nb_samples *
+ 1000000 / p_filter->output.i_rate;
+
+ i_wanted_nb = p_in_buf->i_nb_samples * p_filter->output.i_rate
+ / p_filter->input.i_rate;
+ i_new_rate = p_middle_buf->i_nb_samples * p_filter->output.i_rate
+ / i_wanted_nb;
+
+ p_sys->p_secondary_resampler->input.i_rate = i_new_rate;
+ p_sys->p_secondary_resampler->pf_do_work( p_aout,
+ p_sys->p_secondary_resampler, p_middle_buf, p_out_buf );
+
+ if ( p_middle_buf != p_out_buf )
+ {
+ aout_BufferFree( p_middle_buf );
+ }
+}
projects / vlc / commitdiff