From 03eb53dacdf6eda21e4cf09920aa01e99d0e60e2 Mon Sep 17 00:00:00 2001
From: Thomas Guillem <thomas@gllm.fr>
Date: Mon, 10 Oct 2016 16:06:05 +0200
Subject: [PATCH] mpeg_audio: reorder code
In order to avoid forward declarations.
---
modules/codec/mpeg_audio.c | 693 ++++++++++++++++++-------------------
1 file changed, 341 insertions(+), 352 deletions(-)
diff --git a/modules/codec/mpeg_audio.c b/modules/codec/mpeg_audio.c
index 6c9f09d78a1c..4ef2698cb6c3 100644
--- a/modules/codec/mpeg_audio.c
+++ b/modules/codec/mpeg_audio.c
@@ -87,20 +87,9 @@ struct decoder_sys_t
#ifdef HAVE_MPGA_FILTER
static int OpenDecoder ( vlc_object_t * );
-static block_t *GetAoutBuffer( decoder_t * );
#endif
static int Open( vlc_object_t * );
-static block_t *DecodeBlock ( decoder_t *, block_t ** );
-static void Flush( decoder_t * );
-static uint8_t *GetOutBuffer ( decoder_t *, block_t ** );
-static block_t *GetSoutBuffer( decoder_t * );
static void Close( vlc_object_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_max_frame_size,
- unsigned int * pi_layer );
/*****************************************************************************
* Module descriptor
@@ -120,177 +109,332 @@ vlc_module_begin ()
vlc_module_end ()
/*****************************************************************************
- * Open: probe the decoder and return score
+ * Flush:
*****************************************************************************/
-static int Open( vlc_object_t *p_this )
+static void Flush( decoder_t *p_dec )
{
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys;
-
- if(( p_dec->fmt_in.i_codec != VLC_CODEC_MPGA ) &&
- ( p_dec->fmt_in.i_codec != VLC_CODEC_MP3 ) )
- {
- return VLC_EGENERIC;
- }
-
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_dec->p_sys = p_sys =
- (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
- return VLC_ENOMEM;
+ decoder_sys_t *p_sys = p_dec->p_sys;
- /* Misc init */
-#ifdef HAVE_MPGA_FILTER
- p_sys->b_packetizer = true;
-#endif
- p_sys->i_state = STATE_NOSYNC;
date_Set( &p_sys->end_date, 0 );
- block_BytestreamInit( &p_sys->bytestream );
- p_sys->i_pts = VLC_TS_INVALID;
- p_sys->b_discontinuity = false;
- p_sys->i_frame_size = 0;
-
- p_sys->i_channels_conf = p_sys->i_channels = p_sys->i_rate =
- p_sys->i_max_frame_size = p_sys->i_frame_length = p_sys->i_layer =
- p_sys->i_bit_rate = 0;
-
- /* Set output properties */
- p_dec->fmt_out.i_cat = AUDIO_ES;
- p_dec->fmt_out.i_codec = VLC_CODEC_MPGA;
- p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */
-
- /* Set callback */
- p_dec->pf_decode_audio = DecodeBlock;
- p_dec->pf_packetize = DecodeBlock;
- p_dec->pf_flush = Flush;
-
- /* Start with the minimum size for a free bitrate frame */
- p_sys->i_free_frame_size = MPGA_HEADER_SIZE;
-
- return VLC_SUCCESS;
+ p_sys->i_state = STATE_NOSYNC;
+ block_BytestreamEmpty( &p_sys->bytestream );
+ p_sys->b_discontinuity = true;
}
#ifdef HAVE_MPGA_FILTER
-static int OpenDecoder( vlc_object_t *p_this )
+/*****************************************************************************
+ * GetAoutBuffer:
+ *****************************************************************************/
+static block_t *GetAoutBuffer( decoder_t *p_dec )
{
- decoder_t *p_dec = (decoder_t *)p_this;
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ block_t *p_buf;
- /* HACK: Don't use this codec if we don't have an mpga audio filter */
- if( !module_exists( "mad" ) )
- return VLC_EGENERIC;
+ if( decoder_UpdateAudioFormat( p_dec ) )
+ return NULL;
+ p_buf = decoder_NewAudioBuffer( p_dec, p_sys->i_frame_length );
+ if( p_buf == NULL ) return NULL;
- int i_ret = Open( p_this );
- if( i_ret != VLC_SUCCESS )
- return i_ret;
+ p_buf->i_pts = date_Get( &p_sys->end_date );
+ p_buf->i_length = date_Increment( &p_sys->end_date, p_sys->i_frame_length )
+ - p_buf->i_pts;
+ if( p_sys->b_discontinuity )
+ p_buf->i_flags |= BLOCK_FLAG_DISCONTINUITY;
+ p_sys->b_discontinuity = false;
- p_dec->p_sys->b_packetizer = false;
- return VLC_SUCCESS;
+ /* Hack for libmad filter */
+ p_buf = block_Realloc( p_buf, 0, p_sys->i_frame_size + MAD_BUFFER_GUARD );
+
+ return p_buf;
}
#endif
/*****************************************************************************
- * Flush:
+ * GetSoutBuffer:
*****************************************************************************/
-static void Flush( decoder_t *p_dec )
+static block_t *GetSoutBuffer( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
+ block_t *p_block;
- date_Set( &p_sys->end_date, 0 );
- p_sys->i_state = STATE_NOSYNC;
- block_BytestreamEmpty( &p_sys->bytestream );
- p_sys->b_discontinuity = true;
+ p_block = block_Alloc( p_sys->i_frame_size );
+ if( p_block == NULL ) return NULL;
+
+ p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
+
+ p_block->i_length =
+ date_Increment( &p_sys->end_date, p_sys->i_frame_length ) - p_block->i_pts;
+
+ return p_block;
}
-/****************************************************************************
- * DecodeBlock: the whole thing
- ****************************************************************************
- * This function is called just after the thread is launched.
- ****************************************************************************/
-static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
+/*****************************************************************************
+ * GetOutBuffer:
+ *****************************************************************************/
+static uint8_t *GetOutBuffer( decoder_t *p_dec, block_t **pp_out_buffer )
{
decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t p_header[MAD_BUFFER_GUARD];
- uint32_t i_header;
uint8_t *p_buf;
- block_t *p_out_buffer;
-
- block_t *p_block = pp_block ? *pp_block : NULL;
- if (p_block)
+ if( p_dec->fmt_out.audio.i_rate != p_sys->i_rate )
{
- if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
- {
- if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
- {
- Flush( p_dec );
- block_Release( p_block );
- *pp_block = NULL;
- return NULL;
- }
- else /* BLOCK_FLAG_DISCONTINUITY */
- date_Set( &p_sys->end_date, 0 );
- p_sys->b_discontinuity = true;
- }
+ msg_Dbg( p_dec, "MPGA channels:%d samplerate:%d bitrate:%d",
+ p_sys->i_channels, p_sys->i_rate, p_sys->i_bit_rate );
- if( !date_Get( &p_sys->end_date ) && p_block->i_pts <= VLC_TS_INVALID )
- {
- /* We've just started the stream, wait for the first PTS. */
- msg_Dbg( p_dec, "waiting for PTS" );
- block_Release( p_block );
- return NULL;
- }
+ date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
+ date_Set( &p_sys->end_date, p_sys->i_pts );
+ }
- block_BytestreamPush( &p_sys->bytestream, p_block );
- } else if (p_sys->i_frame_size)
- p_sys->i_state = STATE_SEND_DATA; /* return all the data we have left */
+ p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
+ p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
+ p_dec->fmt_out.audio.i_frame_length = p_sys->i_frame_length;
+ p_dec->fmt_out.audio.i_bytes_per_frame =
+ p_sys->i_max_frame_size + MAD_BUFFER_GUARD;
+
+ p_dec->fmt_out.audio.i_original_channels = p_sys->i_channels_conf;
+ p_dec->fmt_out.audio.i_physical_channels =
+ p_sys->i_channels_conf & AOUT_CHAN_PHYSMASK;
+
+ p_dec->fmt_out.i_bitrate = p_sys->i_bit_rate * 1000;
+
+#ifdef HAVE_MPGA_FILTER
+ if( !p_sys->b_packetizer )
+ {
+ block_t *p_aout_buffer = GetAoutBuffer( p_dec );
+ p_buf = p_aout_buffer ? p_aout_buffer->p_buffer : NULL;
+ *pp_out_buffer = p_aout_buffer;
+ }
else
- return NULL;
+#endif
+ {
+ block_t *p_sout_buffer = GetSoutBuffer( p_dec );
+ p_buf = p_sout_buffer ? p_sout_buffer->p_buffer : NULL;
+ *pp_out_buffer = p_sout_buffer;
+ }
+ return p_buf;
+}
- while( 1 )
+/*****************************************************************************
+ * 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_max_frame_size, unsigned int * pi_layer)
+{
+ static const int ppi_bitrate[2][3][16] =
{
- switch( p_sys->i_state )
{
+ /* v1 l1 */
+ { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384,
+ 416, 448, 0},
+ /* v1 l2 */
+ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256,
+ 320, 384, 0},
+ /* v1 l3 */
+ { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224,
+ 256, 320, 0}
+ },
- case STATE_NOSYNC:
- while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
- == VLC_SUCCESS )
- {
- /* Look for sync word - should be 0xffe */
- if( p_header[0] == 0xff && (p_header[1] & 0xe0) == 0xe0 )
- {
- p_sys->i_state = STATE_SYNC;
- break;
- }
- block_SkipByte( &p_sys->bytestream );
- }
- if( p_sys->i_state != STATE_SYNC )
- {
- block_BytestreamFlush( &p_sys->bytestream );
-
- /* Need more data */
- return NULL;
- }
+ {
+ /* v2 l1 */
+ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192,
+ 224, 256, 0},
+ /* v2 l2 */
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
+ 144, 160, 0},
+ /* v2 l3 */
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
+ 144, 160, 0}
+ }
+ };
- case STATE_SYNC:
- /* New frame, set the Presentation Time Stamp */
- p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
- if( p_sys->i_pts > VLC_TS_INVALID &&
- p_sys->i_pts > date_Get( &p_sys->end_date ) )
- {
- date_Set( &p_sys->end_date, p_sys->i_pts );
- }
- p_sys->i_state = STATE_HEADER;
+ static const int ppi_samplerate[2][4] = /* version 1 then 2 */
+ {
+ { 44100, 48000, 32000, 0 },
+ { 22050, 24000, 16000, 0 }
+ };
- case STATE_HEADER:
- /* Get MPGA frame header (MPGA_HEADER_SIZE bytes) */
- if( block_PeekBytes( &p_sys->bytestream, p_header,
- MPGA_HEADER_SIZE ) != VLC_SUCCESS )
- {
- /* Need more data */
- return NULL;
- }
+ int i_version, i_mode, i_emphasis;
+ bool b_padding, b_mpeg_2_5;
+ int i_frame_size = 0;
+ int i_bitrate_index, i_samplerate_index;
+ int i_max_bit_rate;
- /* Build frame header */
- i_header = GetDWBE(p_header);
+ b_mpeg_2_5 = 1 - ((i_header & 0x100000) >> 20);
+ i_version = 1 - ((i_header & 0x80000) >> 19);
+ *pi_layer = 4 - ((i_header & 0x60000) >> 17);
+ //bool b_crc = !((i_header >> 16) & 0x01);
+ i_bitrate_index = (i_header & 0xf000) >> 12;
+ i_samplerate_index = (i_header & 0xc00) >> 10;
+ b_padding = (i_header & 0x200) >> 9;
+ /* Extension */
+ i_mode = (i_header & 0xc0) >> 6;
+ /* Modeext, copyright & original */
+ i_emphasis = i_header & 0x3;
+
+ if( *pi_layer != 4 &&
+ i_bitrate_index < 0x0f &&
+ i_samplerate_index != 0x03 &&
+ i_emphasis != 0x02 )
+ {
+ switch ( i_mode )
+ {
+ case 0: /* stereo */
+ case 1: /* joint stereo */
+ *pi_channels = 2;
+ *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ break;
+ case 2: /* dual-mono */
+ *pi_channels = 2;
+ *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_DUALMONO;
+ break;
+ case 3: /* mono */
+ *pi_channels = 1;
+ *pi_channels_conf = AOUT_CHAN_CENTER;
+ break;
+ }
+ *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 )
+ {
+ *pi_sample_rate >>= 1;
+ }
+
+ switch( *pi_layer )
+ {
+ case 1:
+ 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_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_frame_size = ( i_version ? 72000 : 144000 ) *
+ *pi_bit_rate / *pi_sample_rate + b_padding;
+ *pi_max_frame_size = ( i_version ? 72000 : 144000 ) *
+ i_max_bit_rate / *pi_sample_rate + 1;
+ *pi_frame_length = i_version ? 576 : 1152;
+ break;
+
+ default:
+ break;
+ }
+
+ /* Free bitrate mode can support higher bitrates */
+ if( !*pi_bit_rate ) *pi_max_frame_size *= 2;
+ }
+ else
+ {
+ return -1;
+ }
+
+ return i_frame_size;
+}
+
+/****************************************************************************
+ * DecodeBlock: the whole thing
+ ****************************************************************************
+ * This function is called just after the thread is launched.
+ ****************************************************************************/
+static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
+{
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ uint8_t p_header[MAD_BUFFER_GUARD];
+ uint32_t i_header;
+ uint8_t *p_buf;
+ block_t *p_out_buffer;
+
+ block_t *p_block = pp_block ? *pp_block : NULL;
+
+ if (p_block)
+ {
+ if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
+ {
+ if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
+ {
+ Flush( p_dec );
+ block_Release( p_block );
+ *pp_block = NULL;
+ return NULL;
+ }
+ else /* BLOCK_FLAG_DISCONTINUITY */
+ date_Set( &p_sys->end_date, 0 );
+ p_sys->b_discontinuity = true;
+ }
+
+ if( !date_Get( &p_sys->end_date ) && p_block->i_pts <= VLC_TS_INVALID )
+ {
+ /* We've just started the stream, wait for the first PTS. */
+ msg_Dbg( p_dec, "waiting for PTS" );
+ block_Release( p_block );
+ return NULL;
+ }
+
+ block_BytestreamPush( &p_sys->bytestream, p_block );
+ } else if (p_sys->i_frame_size)
+ p_sys->i_state = STATE_SEND_DATA; /* return all the data we have left */
+ else
+ return NULL;
+
+ while( 1 )
+ {
+ switch( p_sys->i_state )
+ {
+
+ case STATE_NOSYNC:
+ while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
+ == VLC_SUCCESS )
+ {
+ /* Look for sync word - should be 0xffe */
+ if( p_header[0] == 0xff && (p_header[1] & 0xe0) == 0xe0 )
+ {
+ p_sys->i_state = STATE_SYNC;
+ break;
+ }
+ block_SkipByte( &p_sys->bytestream );
+ }
+ if( p_sys->i_state != STATE_SYNC )
+ {
+ block_BytestreamFlush( &p_sys->bytestream );
+
+ /* Need more data */
+ return NULL;
+ }
+
+ case STATE_SYNC:
+ /* New frame, set the Presentation Time Stamp */
+ p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
+ if( p_sys->i_pts > VLC_TS_INVALID &&
+ p_sys->i_pts > date_Get( &p_sys->end_date ) )
+ {
+ date_Set( &p_sys->end_date, p_sys->i_pts );
+ }
+ p_sys->i_state = STATE_HEADER;
+
+ case STATE_HEADER:
+ /* Get MPGA frame header (MPGA_HEADER_SIZE bytes) */
+ if( block_PeekBytes( &p_sys->bytestream, p_header,
+ MPGA_HEADER_SIZE ) != VLC_SUCCESS )
+ {
+ /* Need more data */
+ return NULL;
+ }
+
+ /* Build frame header */
+ i_header = GetDWBE(p_header);
/* Check if frame is valid and get frame info */
p_sys->i_frame_size = SyncInfo( i_header,
@@ -508,99 +652,6 @@ static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
return NULL;
}
-/*****************************************************************************
- * GetOutBuffer:
- *****************************************************************************/
-static uint8_t *GetOutBuffer( decoder_t *p_dec, block_t **pp_out_buffer )
-{
- decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t *p_buf;
-
- if( p_dec->fmt_out.audio.i_rate != p_sys->i_rate )
- {
- msg_Dbg( p_dec, "MPGA channels:%d samplerate:%d bitrate:%d",
- p_sys->i_channels, p_sys->i_rate, p_sys->i_bit_rate );
-
- date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
- date_Set( &p_sys->end_date, p_sys->i_pts );
- }
-
- p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
- p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
- p_dec->fmt_out.audio.i_frame_length = p_sys->i_frame_length;
- p_dec->fmt_out.audio.i_bytes_per_frame =
- p_sys->i_max_frame_size + MAD_BUFFER_GUARD;
-
- p_dec->fmt_out.audio.i_original_channels = p_sys->i_channels_conf;
- p_dec->fmt_out.audio.i_physical_channels =
- p_sys->i_channels_conf & AOUT_CHAN_PHYSMASK;
-
- p_dec->fmt_out.i_bitrate = p_sys->i_bit_rate * 1000;
-
-#ifdef HAVE_MPGA_FILTER
- if( !p_sys->b_packetizer )
- {
- block_t *p_aout_buffer = GetAoutBuffer( p_dec );
- p_buf = p_aout_buffer ? p_aout_buffer->p_buffer : NULL;
- *pp_out_buffer = p_aout_buffer;
- }
- else
-#endif
- {
- block_t *p_sout_buffer = GetSoutBuffer( p_dec );
- p_buf = p_sout_buffer ? p_sout_buffer->p_buffer : NULL;
- *pp_out_buffer = p_sout_buffer;
- }
- return p_buf;
-}
-
-#ifdef HAVE_MPGA_FILTER
-/*****************************************************************************
- * GetAoutBuffer:
- *****************************************************************************/
-static block_t *GetAoutBuffer( decoder_t *p_dec )
-{
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_buf;
-
- if( decoder_UpdateAudioFormat( p_dec ) )
- return NULL;
- p_buf = decoder_NewAudioBuffer( p_dec, p_sys->i_frame_length );
- if( p_buf == NULL ) return NULL;
-
- p_buf->i_pts = date_Get( &p_sys->end_date );
- p_buf->i_length = date_Increment( &p_sys->end_date, p_sys->i_frame_length )
- - p_buf->i_pts;
- if( p_sys->b_discontinuity )
- p_buf->i_flags |= BLOCK_FLAG_DISCONTINUITY;
- p_sys->b_discontinuity = false;
-
- /* Hack for libmad filter */
- p_buf = block_Realloc( p_buf, 0, p_sys->i_frame_size + MAD_BUFFER_GUARD );
-
- return p_buf;
-}
-#endif
-
-/*****************************************************************************
- * GetSoutBuffer:
- *****************************************************************************/
-static block_t *GetSoutBuffer( decoder_t *p_dec )
-{
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_block;
-
- p_block = block_Alloc( p_sys->i_frame_size );
- if( p_block == NULL ) return NULL;
-
- p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
-
- p_block->i_length =
- date_Increment( &p_sys->end_date, p_sys->i_frame_length ) - p_block->i_pts;
-
- return p_block;
-}
-
/*****************************************************************************
* Close: clean up the decoder
*****************************************************************************/
@@ -615,131 +666,69 @@ static void Close( vlc_object_t *p_this )
}
/*****************************************************************************
- * SyncInfo: parse MPEG audio sync info
+ * Open: probe the decoder and return score
*****************************************************************************/
-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_max_frame_size, unsigned int * pi_layer)
+static int Open( vlc_object_t *p_this )
{
- static const int ppi_bitrate[2][3][16] =
- {
- {
- /* v1 l1 */
- { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384,
- 416, 448, 0},
- /* v1 l2 */
- { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256,
- 320, 384, 0},
- /* v1 l3 */
- { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224,
- 256, 320, 0}
- },
-
- {
- /* v2 l1 */
- { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192,
- 224, 256, 0},
- /* v2 l2 */
- { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
- 144, 160, 0},
- /* v2 l3 */
- { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
- 144, 160, 0}
- }
- };
+ decoder_t *p_dec = (decoder_t*)p_this;
+ decoder_sys_t *p_sys;
- static const int ppi_samplerate[2][4] = /* version 1 then 2 */
+ if(( p_dec->fmt_in.i_codec != VLC_CODEC_MPGA ) &&
+ ( p_dec->fmt_in.i_codec != VLC_CODEC_MP3 ) )
{
- { 44100, 48000, 32000, 0 },
- { 22050, 24000, 16000, 0 }
- };
+ return VLC_EGENERIC;
+ }
- int i_version, i_mode, i_emphasis;
- bool b_padding, b_mpeg_2_5;
- int i_frame_size = 0;
- int i_bitrate_index, i_samplerate_index;
- int i_max_bit_rate;
+ /* Allocate the memory needed to store the decoder's structure */
+ if( ( p_dec->p_sys = p_sys =
+ (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
+ return VLC_ENOMEM;
- b_mpeg_2_5 = 1 - ((i_header & 0x100000) >> 20);
- i_version = 1 - ((i_header & 0x80000) >> 19);
- *pi_layer = 4 - ((i_header & 0x60000) >> 17);
- //bool b_crc = !((i_header >> 16) & 0x01);
- i_bitrate_index = (i_header & 0xf000) >> 12;
- i_samplerate_index = (i_header & 0xc00) >> 10;
- b_padding = (i_header & 0x200) >> 9;
- /* Extension */
- i_mode = (i_header & 0xc0) >> 6;
- /* Modeext, copyright & original */
- i_emphasis = i_header & 0x3;
+ /* Misc init */
+#ifdef HAVE_MPGA_FILTER
+ p_sys->b_packetizer = true;
+#endif
+ p_sys->i_state = STATE_NOSYNC;
+ date_Set( &p_sys->end_date, 0 );
+ block_BytestreamInit( &p_sys->bytestream );
+ p_sys->i_pts = VLC_TS_INVALID;
+ p_sys->b_discontinuity = false;
+ p_sys->i_frame_size = 0;
- if( *pi_layer != 4 &&
- i_bitrate_index < 0x0f &&
- i_samplerate_index != 0x03 &&
- i_emphasis != 0x02 )
- {
- switch ( i_mode )
- {
- case 0: /* stereo */
- case 1: /* joint stereo */
- *pi_channels = 2;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- break;
- case 2: /* dual-mono */
- *pi_channels = 2;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
- | AOUT_CHAN_DUALMONO;
- break;
- case 3: /* mono */
- *pi_channels = 1;
- *pi_channels_conf = AOUT_CHAN_CENTER;
- break;
- }
- *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];
+ p_sys->i_channels_conf = p_sys->i_channels = p_sys->i_rate =
+ p_sys->i_max_frame_size = p_sys->i_frame_length = p_sys->i_layer =
+ p_sys->i_bit_rate = 0;
- if ( b_mpeg_2_5 )
- {
- *pi_sample_rate >>= 1;
- }
+ /* Set output properties */
+ p_dec->fmt_out.i_cat = AUDIO_ES;
+ p_dec->fmt_out.i_codec = VLC_CODEC_MPGA;
+ p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */
- switch( *pi_layer )
- {
- case 1:
- 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;
+ /* Set callback */
+ p_dec->pf_decode_audio = DecodeBlock;
+ p_dec->pf_packetize = DecodeBlock;
+ p_dec->pf_flush = Flush;
- case 2:
- 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;
+ /* Start with the minimum size for a free bitrate frame */
+ p_sys->i_free_frame_size = MPGA_HEADER_SIZE;
- case 3:
- i_frame_size = ( i_version ? 72000 : 144000 ) *
- *pi_bit_rate / *pi_sample_rate + b_padding;
- *pi_max_frame_size = ( i_version ? 72000 : 144000 ) *
- i_max_bit_rate / *pi_sample_rate + 1;
- *pi_frame_length = i_version ? 576 : 1152;
- break;
+ return VLC_SUCCESS;
+}
- default:
- break;
- }
+#ifdef HAVE_MPGA_FILTER
+static int OpenDecoder( vlc_object_t *p_this )
+{
+ decoder_t *p_dec = (decoder_t *)p_this;
- /* Free bitrate mode can support higher bitrates */
- if( !*pi_bit_rate ) *pi_max_frame_size *= 2;
- }
- else
- {
- return -1;
- }
+ /* HACK: Don't use this codec if we don't have an mpga audio filter */
+ if( !module_exists( "mad" ) )
+ return VLC_EGENERIC;
- return i_frame_size;
+ int i_ret = Open( p_this );
+ if( i_ret != VLC_SUCCESS )
+ return i_ret;
+
+ p_dec->p_sys->b_packetizer = false;
+ return VLC_SUCCESS;
}
+#endif
--
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