#ifdef ENABLE_SOUT
static int OpenEncoder ( vlc_object_t * );
static void CloseEncoder ( vlc_object_t * );
-static block_t *EncoderEncode( encoder_t *, aout_buffer_t * );
+static block_t *EncodeFrames( encoder_t *, aout_buffer_t * );
#endif
vlc_module_begin ()
set_capability( "packetizer", 100 )
set_callbacks( OpenPacketizer, CloseCommon )
+#ifdef ENABLE_SOUT
add_submodule ()
set_description( N_("Linear PCM audio encoder") )
set_capability( "encoder", 100 )
set_callbacks( OpenEncoder, CloseEncoder )
add_shortcut( "lpcm" )
+#endif
vlc_module_end ()
int i_type;
};
+#ifdef ENABLE_SOUT
struct encoder_sys_t
{
int i_channels;
int i_buffer_used;
int i_frame_num;
};
+#endif
/*
* LPCM DVD header :
- * - number of frames in this packet (8 bits)
- * - first access unit (16 bits) == 0x0003 ?
- * - emphasis (1 bit)
- * - mute (1 bit)
- * - reserved (1 bit)
- * - current frame (5 bits)
- * - quantisation (2 bits) 0 == 16bps, 1 == 20bps, 2 == 24bps, 3 == illegal
- * - frequency (2 bits) 0 == 48 kHz, 1 == 96 kHz, 2 == 44.1 kHz, 3 == 32 kHz
- * - reserved (1 bit)
+ * - frame number (8 bits)
+ * - unknown (16 bits) == 0x0003 ?
+ * - unknown (4 bits)
+ * - current frame (4 bits)
+ * - unknown (2 bits)
+ * - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
+ * - unknown (1 bit)
* - number of channels - 1 (3 bits) 1 == 2 channels
- * - dynamic range (8 bits) 0x80 == neutral
+ * - start code (8 bits) == 0x80
*
* LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
* - continuity counter (8 bits, clipped to 0x00-0x1f)
free( p_dec->p_sys );
}
+#ifdef ENABLE_SOUT
/*****************************************************************************
- * OpenEncoder:
+ * OpenEncoder: lpcm encoder construction
*****************************************************************************/
static int OpenEncoder( vlc_object_t *p_this )
{
encoder_t *p_enc = (encoder_t *)p_this;
encoder_sys_t *p_sys;
- if( p_enc->fmt_out.i_codec != VLC_CODEC_DVD_LPCM ||
- ( p_enc->fmt_in.audio.i_rate != 48000 &&
- p_enc->fmt_in.audio.i_rate != 96000 &&
- p_enc->fmt_in.audio.i_rate != 44100 &&
- p_enc->fmt_in.audio.i_rate != 32000 ) ||
- p_enc->fmt_in.audio.i_channels > 8 )
+ /* We only support DVD LPCM yet. */
+ if( p_enc->fmt_out.i_codec != VLC_CODEC_DVD_LPCM )
+ return VLC_EGENERIC;
+
+ if( p_enc->fmt_in.audio.i_rate != 48000 &&
+ p_enc->fmt_in.audio.i_rate != 96000 &&
+ p_enc->fmt_in.audio.i_rate != 44100 &&
+ p_enc->fmt_in.audio.i_rate != 32000 )
{
+ msg_Err( p_enc, "DVD LPCM supports only sample rates of 48, 96, 44.1 or 32 kHz" );
+ return VLC_EGENERIC;
+ }
+
+ if( p_enc->fmt_in.audio.i_channels > 8 )
+ {
+ msg_Err( p_enc, "DVD LPCM supports a maximum of eight channels" );
return VLC_EGENERIC;
}
(encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
return VLC_ENOMEM;
- p_enc->pf_encode_audio = EncoderEncode;
- p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
-
- p_enc->fmt_in.audio.i_bitspersample = 16;
- p_enc->fmt_in.i_codec = VLC_CODEC_S16B;
-
- p_enc->fmt_out.i_bitrate =
- p_enc->fmt_in.audio.i_channels *
- p_enc->fmt_in.audio.i_rate *
- p_enc->fmt_in.audio.i_bitspersample;
-
- p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
- p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
-
/* In DVD LCPM, a frame is always 150 PTS ticks. */
p_sys->i_frame_samples = p_enc->fmt_in.audio.i_rate * 150 / 90000;
p_sys->p_buffer = (uint8_t *)malloc(
p_sys->i_buffer_used = 0;
p_sys->i_frame_num = 0;
+ p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
+ p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
+
+ p_enc->pf_encode_audio = EncodeFrames;
+ p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
+
+ p_enc->fmt_in.audio.i_bitspersample = 16;
+ p_enc->fmt_in.i_codec = VLC_CODEC_S16B;
+
+ p_enc->fmt_out.i_bitrate =
+ p_enc->fmt_in.audio.i_channels *
+ p_enc->fmt_in.audio.i_rate *
+ p_enc->fmt_in.audio.i_bitspersample *
+ (p_sys->i_frame_samples + LPCM_VOB_HEADER_LEN) /
+ p_sys->i_frame_samples;
+
return VLC_SUCCESS;
}
/*****************************************************************************
- * CloseEncoder
+ * CloseEncoder: lpcm encoder destruction
*****************************************************************************/
static void CloseEncoder ( vlc_object_t *p_this )
{
}
/*****************************************************************************
- * EncoderEncode:
+ * EncodeFrames: encode zero or more LCPM audio packets
*****************************************************************************/
-static block_t *EncoderEncode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
+static block_t *EncodeFrames( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
{
encoder_sys_t *p_sys = p_enc->p_sys;
block_t *p_first_block = NULL, *p_last_block = NULL;
const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
p_sys->i_frame_samples;
const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
+ const int i_start_offset = -p_sys->i_buffer_used;
uint8_t i_freq_code = 0;
case 32000:
i_freq_code = 3;
break;
+ default:
+ assert(0);
}
int i_bytes_consumed = 0;
memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed, i_consume_bytes );
-
+
p_sys->i_frame_num++;
p_sys->i_buffer_used = 0;
i_bytes_consumed += i_consume_bytes;
- /*
- * The pts is strictly not correct if we have samples kept from
- * a previous buffer, but the frames are so small it should be OK.
- */
- p_block->i_dts = p_block->i_pts = p_aout_buf->i_pts + i * p_sys->i_frame_samples * CLOCK_FREQ / p_sys->i_rate;
+ p_block->i_dts = p_block->i_pts = p_aout_buf->i_pts +
+ (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
p_block->i_length = p_sys->i_frame_samples * CLOCK_FREQ / p_sys->i_rate;
-
+
if( !p_first_block )
p_first_block = p_last_block = p_block;
else
- block_ChainLastAppend( &p_last_block, p_block );
+ p_last_block = p_last_block->p_next = p_block;
}
memcpy( p_sys->p_buffer,
return p_first_block;
}
+#endif
/*****************************************************************************
*
projects / vlc / blobdiff