Skip to content

V
vlc-2-2
Commit 1c2c4af5 authored by Gildas Bazin's avatar Gildas Bazin
Browse files
Options 

* modules/codec/mpeg_audio.c: fixes and improvements.
* include/vlc_block_helper.h: fix for an offset problem in block_SkipBytes() and block_GetBytes(). (This fixes the problems with the new mpeg_audio decoder/packetizer).
parent 84c04e72
Show whitespace changes
Inline Side-by-side
Showing with 70 additions and 43 deletions
include/vlc_block_helper.h
View file @ 1c2c4af5
......@@ -2,7 +2,7 @@
* vlc_block_helper.h: Helper functions for data blocks management.
*****************************************************************************
* Copyright (C) 2003 VideoLAN
* $Id: vlc_block_helper.h,v 1.2 2003/09/30 20:36:46 gbazin Exp $
* $Id: vlc_block_helper.h,v 1.3 2003/10/05 00:50:05 gbazin Exp $
*
* Authors: Gildas Bazin <gbazin@netcourrier.com>
*
......@@ -165,9 +165,10 @@ static inline int block_SkipBytes( block_bytestream_t *p_bytestream,
{
i_copy = __MIN( i_data, p_block->i_buffer - i_offset );
i_data -= i_copy;
i_offset = 0;
if( !i_data ) break;
i_offset = 0;
}
if( i_data )
......@@ -177,7 +178,7 @@ static inline int block_SkipBytes( block_bytestream_t *p_bytestream,
}
p_bytestream->p_block = p_block;
p_bytestream->i_offset = i_copy;
p_bytestream->i_offset = i_offset + i_copy;
return VLC_SUCCESS;
}
......@@ -273,14 +274,14 @@ static inline int block_GetBytes( block_bytestream_t *p_bytestream,
p_data += i_copy;
}
i_offset = 0;
if( !i_size ) break;
i_offset = 0;
}
/* No buffer given, just skip the data */
p_bytestream->p_block = p_block;
p_bytestream->i_offset = i_copy;
p_bytestream->i_offset = i_offset + i_copy;
return VLC_SUCCESS;
}
......
modules/codec/mpeg_audio.c
View file @ 1c2c4af5
......@@ -2,7 +2,7 @@
* mpeg_audio.c: parse MPEG audio sync info and packetize the stream
*****************************************************************************
* Copyright (C) 2001-2003 VideoLAN
* $Id: mpeg_audio.c,v 1.18 2003/10/04 12:04:06 gbazin Exp $
* $Id: mpeg_audio.c,v 1.19 2003/10/05 00:50:05 gbazin Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
......@@ -50,6 +50,7 @@ struct decoder_sys_t
* Input properties
*/
int i_state;
vlc_bool_t b_synchro;
block_t *p_chain;
block_bytestream_t bytestream;
......@@ -93,7 +94,6 @@ enum {
STATE_DATA
};
#define MAX_FRAME_SIZE 10000
/* This isn't the place to put mad-specific stuff. However, it makes the
* mad plug-in's life much easier if we put 8 extra bytes at the end of the
* buffer, because that way it doesn't have to copy the aout_buffer_t to a
......@@ -118,9 +118,10 @@ static int GetSoutBuffer( decoder_t *, sout_buffer_t ** );
static int SendOutBuffer( decoder_t * );
static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
unsigned int * pi_channels_conf,
unsigned int * pi_sample_rate, unsigned int * pi_bit_rate,
unsigned int * pi_frame_length,
unsigned int * pi_current_frame_length,
unsigned int * pi_max_frame_size,
unsigned int * pi_layer );
/*****************************************************************************
......@@ -182,6 +183,7 @@ static int OpenPacketizer( vlc_object_t *p_this )
static int InitDecoder( decoder_t *p_dec )
{
p_dec->p_sys->i_state = STATE_NOSYNC;
p_dec->p_sys->b_synchro = VLC_FALSE;
p_dec->p_sys->p_out_buffer = NULL;
aout_DateSet( &p_dec->p_sys->end_date, 0 );
......@@ -196,7 +198,7 @@ static int InitDecoder( decoder_t *p_dec )
p_dec->p_sys->sout_format.i_cat = AUDIO_ES;
p_dec->p_sys->sout_format.i_fourcc = VLC_FOURCC('m','p','g','a');
/* Start with the inimum size for a free bitrate frame */
/* Start with the minimum size for a free bitrate frame */
p_dec->p_sys->i_free_frame_size = MPGA_HEADER_SIZE;
p_dec->p_sys->p_chain = NULL;
......@@ -215,10 +217,12 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
uint8_t p_header[MAD_BUFFER_GUARD];
uint32_t i_header;
if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
if( (!aout_DateGet( &p_sys->end_date ) && !p_block->i_pts)
|| p_block->b_discontinuity )
{
/* We've just started the stream, wait for the first PTS. */
block_Release( p_block );
p_sys->b_synchro = VLC_FALSE;
return VLC_SUCCESS;
}
......@@ -248,6 +252,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
break;
}
block_SkipByte( &p_sys->bytestream );
p_sys->b_synchro = VLC_FALSE;
}
if( p_sys->i_state != STATE_SYNC )
{
......@@ -284,11 +289,12 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
/* Check if frame is valid and get frame info */
p_sys->i_frame_size = SyncInfo( i_header,
&p_sys->i_channels,
&p_sys->i_channels_conf,
&p_sys->i_rate,
&p_sys->i_bit_rate,
&p_sys->i_frame_length,
&p_sys->i_frame_size,
&p_sys->i_max_frame_size,
&p_sys->i_layer );
if( p_sys->i_frame_size == -1 )
......@@ -296,6 +302,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
msg_Dbg( p_dec, "emulated start code" );
block_SkipByte( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
p_sys->b_synchro = VLC_FALSE;
break;
}
......@@ -328,7 +335,8 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
{
/* Startcode is fine, let's try the header as an extra check */
int i_next_frame_size;
unsigned int i_next_channels, i_next_rate, i_next_bit_rate;
unsigned int i_next_channels, i_next_channels_conf;
unsigned int i_next_rate, i_next_bit_rate;
unsigned int i_next_frame_length, i_next_max_frame_size;
unsigned int i_next_layer;
......@@ -338,6 +346,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
i_next_frame_size = SyncInfo( i_header,
&i_next_channels,
&i_next_channels_conf,
&i_next_rate,
&i_next_bit_rate,
&i_next_frame_length,
......@@ -375,7 +384,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
}
/* Check info is in sync with previous one */
if( i_next_channels != p_sys->i_channels_conf ||
if( i_next_channels_conf != p_sys->i_channels_conf ||
i_next_rate != p_sys->i_rate ||
i_next_layer != p_sys->i_layer ||
i_next_frame_length != p_sys->i_frame_length )
......@@ -391,10 +400,20 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
"(emulated startcode ?)" );
block_SkipByte( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
p_sys->b_synchro = VLC_FALSE;
break;
}
}
else
{
/* Free bitrate only */
if( p_sys->i_bit_rate == 0 )
{
p_sys->i_frame_size++;
break;
}
if( !p_sys->b_synchro )
{
msg_Dbg( p_dec, "emulated startcode "
"(no startcode on following frame)" );
......@@ -402,6 +421,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
block_SkipByte( &p_sys->bytestream );
break;
}
}
if( GetOutBuffer( p_dec, &p_sys->p_out_buffer ) != VLC_SUCCESS )
{
......@@ -436,6 +456,7 @@ static int RunDecoder( decoder_t *p_dec, block_t *p_block )
SendOutBuffer( p_dec );
p_sys->i_state = STATE_NOSYNC;
p_sys->b_synchro = VLC_TRUE;
/* Make sure we don't reuse the same pts twice */
if( p_sys->pts == p_sys->bytestream.p_block->i_pts )
......@@ -480,7 +501,7 @@ static int GetAoutBuffer( decoder_t *p_dec, aout_buffer_t **pp_buffer )
if( p_sys->p_aout_input != NULL &&
( p_sys->aout_format.i_rate != p_sys->i_rate
|| p_sys->aout_format.i_original_channels != p_sys->i_channels_conf
|| (int)p_sys->aout_format.i_bytes_per_frame !=
|| p_sys->aout_format.i_bytes_per_frame !=
p_sys->i_max_frame_size + MAD_BUFFER_GUARD
|| p_sys->aout_format.i_frame_length != p_sys->i_frame_length
|| p_sys->i_current_layer != p_sys->i_layer ) )
......@@ -570,7 +591,7 @@ static int GetSoutBuffer( decoder_t *p_dec, sout_buffer_t **pp_buffer )
*pp_buffer = NULL;
return VLC_EGENERIC;
}
msg_Info( p_dec, "A/52 channels:%d samplerate:%d bitrate:%d",
msg_Info( p_dec, "MPGA channels:%d samplerate:%d bitrate:%d",
p_sys->i_channels, p_sys->i_rate, p_sys->i_bit_rate );
}
......@@ -606,6 +627,8 @@ static int SendOutBuffer( decoder_t *p_dec )
else
{
/* We have all we need, send the buffer to the aout core. */
p_sys->p_aout_buffer->i_nb_bytes =
p_sys->i_frame_size + MAD_BUFFER_GUARD;
aout_DecPlay( p_sys->p_aout, p_sys->p_aout_input,
p_sys->p_aout_buffer );
p_sys->p_aout_buffer = NULL;
......@@ -655,11 +678,12 @@ static int EndDecoder( decoder_t *p_dec )
* SyncInfo: parse MPEG audio sync info
*****************************************************************************/
static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
unsigned int * pi_channels_conf,
unsigned int * pi_sample_rate, unsigned int * pi_bit_rate,
unsigned int * pi_frame_length,
unsigned int * pi_frame_size, unsigned int * pi_layer )
unsigned int * pi_max_frame_size, unsigned int * pi_layer)
{
static const int pppi_mpegaudio_bitrate[2][3][16] =
static const int ppi_bitrate[2][3][16] =
{
{
/* v1 l1 */
......@@ -686,7 +710,7 @@ static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
}
};
static const int ppi_mpegaudio_samplerate[2][4] = /* version 1 then 2 */
static const int ppi_samplerate[2][4] = /* version 1 then 2 */
{
{ 44100, 48000, 32000, 0 },
{ 22050, 24000, 16000, 0 }
......@@ -694,7 +718,7 @@ static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
int i_version, i_mode, i_emphasis;
vlc_bool_t b_padding, b_mpeg_2_5;
int i_current_frame_size = 0;
int i_frame_size = 0;
int i_bitrate_index, i_samplerate_index;
int i_max_bit_rate;
......@@ -719,19 +743,22 @@ static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
{
case 0: /* stereo */
case 1: /* joint stereo */
*pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
*pi_channels = 2;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
break;
case 2: /* dual-mono */
*pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
*pi_channels = 2;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_DUALMONO;
break;
case 3: /* mono */
*pi_channels = AOUT_CHAN_CENTER;
*pi_channels = 1;
*pi_channels_conf = AOUT_CHAN_CENTER;
break;
}
*pi_bit_rate = pppi_mpegaudio_bitrate[i_version][*pi_layer-1][i_bitrate_index];
i_max_bit_rate = pppi_mpegaudio_bitrate[i_version][*pi_layer-1][14];
*pi_sample_rate = ppi_mpegaudio_samplerate[i_version][i_samplerate_index];
*pi_bit_rate = ppi_bitrate[i_version][*pi_layer-1][i_bitrate_index];
i_max_bit_rate = ppi_bitrate[i_version][*pi_layer-1][14];
*pi_sample_rate = ppi_samplerate[i_version][i_samplerate_index];
if ( b_mpeg_2_5 )
{
......@@ -741,24 +768,23 @@ static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
switch( *pi_layer )
{
case 1:
i_current_frame_size = ( 12000 * *pi_bit_rate /
*pi_sample_rate + b_padding ) * 4;
*pi_frame_size = ( 12000 * i_max_bit_rate /
i_frame_size = ( 12000 * *pi_bit_rate / *pi_sample_rate +
b_padding ) * 4;
*pi_max_frame_size = ( 12000 * i_max_bit_rate /
*pi_sample_rate + 1 ) * 4;
*pi_frame_length = 384;
break;
case 2:
i_current_frame_size = 144000 * *pi_bit_rate /
*pi_sample_rate + b_padding;
*pi_frame_size = 144000 * i_max_bit_rate / *pi_sample_rate + 1;
i_frame_size = 144000 * *pi_bit_rate / *pi_sample_rate + b_padding;
*pi_max_frame_size = 144000 * i_max_bit_rate / *pi_sample_rate + 1;
*pi_frame_length = 1152;
break;
case 3:
i_current_frame_size = ( i_version ? 72000 : 144000 ) *
i_frame_size = ( i_version ? 72000 : 144000 ) *
*pi_bit_rate / *pi_sample_rate + b_padding;
*pi_frame_size = ( i_version ? 72000 : 144000 ) *
*pi_max_frame_size = ( i_version ? 72000 : 144000 ) *
i_max_bit_rate / *pi_sample_rate + 1;
*pi_frame_length = i_version ? 576 : 1152;
break;
......@@ -772,5 +798,5 @@ static int SyncInfo( uint32_t i_header, unsigned int * pi_channels,
return -1;
}
return i_current_frame_size;
return i_frame_size;
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment