speex.c
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上传日期:2009-03-27
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文件大小:25k
- /*****************************************************************************
- * speex.c: speex decoder/packetizer/encoder module making use of libspeex.
- *****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: speex.c 8546 2004-08-28 11:02:51Z gbazin $
- *
- * Authors: Gildas Bazin <gbazin@videolan.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 <vlc/vlc.h>
- #include <vlc/decoder.h>
- #include <vlc/input.h>
- #include <ogg/ogg.h>
- #include <speex.h>
- #include "speex_header.h"
- #include "speex_stereo.h"
- #include "speex_callbacks.h"
- /*****************************************************************************
- * decoder_sys_t : speex decoder descriptor
- *****************************************************************************/
- struct decoder_sys_t
- {
- /* Module mode */
- vlc_bool_t b_packetizer;
- /*
- * Input properties
- */
- int i_headers;
- int i_frame_in_packet;
- /*
- * Speex properties
- */
- SpeexBits bits;
- SpeexHeader *p_header;
- SpeexStereoState stereo;
- void *p_state;
- /*
- * Common properties
- */
- audio_date_t end_date;
- };
- static int pi_channels_maps[6] =
- {
- 0,
- AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
- AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
- AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
- | AOUT_CHAN_REARRIGHT,
- AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
- | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
- };
- /****************************************************************************
- * Local prototypes
- ****************************************************************************/
- static int OpenDecoder ( vlc_object_t * );
- static int OpenPacketizer( vlc_object_t * );
- static void CloseDecoder ( vlc_object_t * );
- static void *DecodeBlock ( decoder_t *, block_t ** );
- static int ProcessHeaders( decoder_t * );
- static int ProcessInitialHeader ( decoder_t *, ogg_packet * );
- static void *ProcessPacket( decoder_t *, ogg_packet *, block_t ** );
- static aout_buffer_t *DecodePacket( decoder_t *, ogg_packet * );
- static block_t *SendPacket( decoder_t *, ogg_packet *, block_t * );
- static void ParseSpeexComments( decoder_t *, ogg_packet * );
- static int OpenEncoder ( vlc_object_t * );
- static void CloseEncoder ( vlc_object_t * );
- static block_t *Encode ( encoder_t *, aout_buffer_t * );
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- vlc_module_begin();
- set_description( _("Speex audio decoder") );
- set_capability( "decoder", 100 );
- set_callbacks( OpenDecoder, CloseDecoder );
- add_submodule();
- set_description( _("Speex audio packetizer") );
- set_capability( "packetizer", 100 );
- set_callbacks( OpenPacketizer, CloseDecoder );
- add_submodule();
- set_description( _("Speex audio encoder") );
- set_capability( "encoder", 100 );
- set_callbacks( OpenEncoder, CloseEncoder );
- vlc_module_end();
- /*****************************************************************************
- * OpenDecoder: probe the decoder and return score
- *****************************************************************************/
- static int OpenDecoder( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys = p_dec->p_sys;
- if( p_dec->fmt_in.i_codec != VLC_FOURCC('s','p','x',' ') )
- {
- 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 )
- {
- msg_Err( p_dec, "out of memory" );
- return VLC_EGENERIC;
- }
- p_dec->p_sys->b_packetizer = VLC_FALSE;
- aout_DateSet( &p_sys->end_date, 0 );
- /* Set output properties */
- p_dec->fmt_out.i_cat = AUDIO_ES;
- p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
- /* Set callbacks */
- p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
- DecodeBlock;
- p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
- DecodeBlock;
- p_sys->i_headers = 0;
- p_sys->p_state = NULL;
- p_sys->p_header = NULL;
- p_sys->i_frame_in_packet = 0;
- return VLC_SUCCESS;
- }
- static int OpenPacketizer( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- int i_ret = OpenDecoder( p_this );
- if( i_ret == VLC_SUCCESS )
- {
- p_dec->p_sys->b_packetizer = VLC_TRUE;
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','p','x',' ');
- }
- return i_ret;
- }
- /****************************************************************************
- * DecodeBlock: the whole thing
- ****************************************************************************
- * This function must be fed with ogg packets.
- ****************************************************************************/
- static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- ogg_packet oggpacket;
- if( !pp_block ) return NULL;
- if( *pp_block )
- {
- /* Block to Ogg packet */
- oggpacket.packet = (*pp_block)->p_buffer;
- oggpacket.bytes = (*pp_block)->i_buffer;
- }
- else
- {
- if( p_sys->b_packetizer ) return NULL;
- /* Block to Ogg packet */
- oggpacket.packet = NULL;
- oggpacket.bytes = 0;
- }
- oggpacket.granulepos = -1;
- oggpacket.b_o_s = 0;
- oggpacket.e_o_s = 0;
- oggpacket.packetno = 0;
- /* Check for headers */
- if( p_sys->i_headers == 0 && p_dec->fmt_in.i_extra )
- {
- /* Headers already available as extra data */
- p_sys->i_headers = 2;
- }
- else if( oggpacket.bytes && p_sys->i_headers < 2 )
- {
- /* Backup headers as extra data */
- uint8_t *p_extra;
- p_dec->fmt_in.p_extra =
- realloc( p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra +
- oggpacket.bytes + 2 );
- p_extra = p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra;
- *(p_extra++) = oggpacket.bytes >> 8;
- *(p_extra++) = oggpacket.bytes & 0xFF;
- memcpy( p_extra, oggpacket.packet, oggpacket.bytes );
- p_dec->fmt_in.i_extra += oggpacket.bytes + 2;
- block_Release( *pp_block );
- p_sys->i_headers++;
- return NULL;
- }
- if( p_sys->i_headers == 2 )
- {
- if( ProcessHeaders( p_dec ) != VLC_SUCCESS )
- {
- p_sys->i_headers = 0;
- p_dec->fmt_in.i_extra = 0;
- block_Release( *pp_block );
- return NULL;
- }
- else p_sys->i_headers++;
- }
- return ProcessPacket( p_dec, &oggpacket, pp_block );
- }
- /*****************************************************************************
- * ProcessHeaders: process Speex headers.
- *****************************************************************************/
- static int ProcessHeaders( decoder_t *p_dec )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- ogg_packet oggpacket;
- uint8_t *p_extra;
- int i_extra;
- if( !p_dec->fmt_in.i_extra ) return VLC_EGENERIC;
- oggpacket.granulepos = -1;
- oggpacket.b_o_s = 1; /* yes this actually is a b_o_s packet :) */
- oggpacket.e_o_s = 0;
- oggpacket.packetno = 0;
- p_extra = p_dec->fmt_in.p_extra;
- i_extra = p_dec->fmt_in.i_extra;
- /* Take care of the initial Vorbis header */
- oggpacket.bytes = *(p_extra++) << 8;
- oggpacket.bytes |= (*(p_extra++) & 0xFF);
- oggpacket.packet = p_extra;
- p_extra += oggpacket.bytes;
- i_extra -= (oggpacket.bytes + 2);
- if( i_extra < 0 )
- {
- msg_Err( p_dec, "header data corrupted");
- return VLC_EGENERIC;
- }
- /* Take care of the initial Speex header */
- if( ProcessInitialHeader( p_dec, &oggpacket ) != VLC_SUCCESS )
- {
- msg_Err( p_dec, "initial Speex header is corrupted" );
- return VLC_EGENERIC;
- }
- /* The next packet in order is the comments header */
- oggpacket.b_o_s = 0;
- oggpacket.bytes = *(p_extra++) << 8;
- oggpacket.bytes |= (*(p_extra++) & 0xFF);
- oggpacket.packet = p_extra;
- p_extra += oggpacket.bytes;
- i_extra -= (oggpacket.bytes + 2);
- if( i_extra < 0 )
- {
- msg_Err( p_dec, "header data corrupted");
- return VLC_EGENERIC;
- }
- ParseSpeexComments( p_dec, &oggpacket );
- if( p_sys->b_packetizer )
- {
- p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
- p_dec->fmt_out.p_extra =
- realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
- memcpy( p_dec->fmt_out.p_extra,
- p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra );
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * ProcessInitialHeader: processes the inital Speex header packet.
- *****************************************************************************/
- static int ProcessInitialHeader( decoder_t *p_dec, ogg_packet *p_oggpacket )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- void *p_state;
- SpeexHeader *p_header;
- const SpeexMode *p_mode;
- SpeexCallback callback;
- p_sys->p_header = p_header =
- speex_packet_to_header( p_oggpacket->packet, p_oggpacket->bytes );
- if( !p_header )
- {
- msg_Err( p_dec, "cannot read Speex header" );
- return VLC_EGENERIC;
- }
- if( p_header->mode >= SPEEX_NB_MODES )
- {
- msg_Err( p_dec, "mode number %d does not (yet/any longer) exist in "
- "this version of libspeex.", p_header->mode );
- return VLC_EGENERIC;
- }
- p_mode = speex_mode_list[p_header->mode];
- if( p_header->speex_version_id > 1 )
- {
- msg_Err( p_dec, "this file was encoded with Speex bit-stream "
- "version %d, which I don't know how to decode.",
- p_header->speex_version_id );
- return VLC_EGENERIC;
- }
- if( p_mode->bitstream_version < p_header->mode_bitstream_version )
- {
- msg_Err( p_dec, "file encoded with a newer version of Speex." );
- return VLC_EGENERIC;
- }
- if( p_mode->bitstream_version > p_header->mode_bitstream_version )
- {
- msg_Err( p_dec, "file encoded with an older version of Speex." );
- return VLC_EGENERIC;
- }
- msg_Dbg( p_dec, "Speex %d Hz audio using %s mode %s%s",
- p_header->rate, p_mode->modeName,
- ( p_header->nb_channels == 1 ) ? " (mono" : " (stereo",
- p_header->vbr ? ", VBR)" : ")" );
- /* Take care of speex decoder init */
- speex_bits_init( &p_sys->bits );
- p_sys->p_state = p_state = speex_decoder_init( p_mode );
- if( !p_state )
- {
- msg_Err( p_dec, "decoder initialization failed" );
- return VLC_EGENERIC;
- }
- if( p_header->nb_channels == 2 )
- {
- SpeexStereoState stereo = SPEEX_STEREO_STATE_INIT;
- p_sys->stereo = stereo;
- callback.callback_id = SPEEX_INBAND_STEREO;
- callback.func = speex_std_stereo_request_handler;
- callback.data = &p_sys->stereo;
- speex_decoder_ctl( p_state, SPEEX_SET_HANDLER, &callback );
- }
- /* Setup the format */
- p_dec->fmt_out.audio.i_physical_channels =
- p_dec->fmt_out.audio.i_original_channels =
- pi_channels_maps[p_header->nb_channels];
- p_dec->fmt_out.audio.i_channels = p_header->nb_channels;
- p_dec->fmt_out.audio.i_rate = p_header->rate;
- aout_DateInit( &p_sys->end_date, p_header->rate );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * ProcessPacket: processes a Speex packet.
- *****************************************************************************/
- static void *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
- block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_block = *pp_block;
- /* Date management */
- if( p_block && p_block->i_pts > 0 &&
- p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
- {
- aout_DateSet( &p_sys->end_date, p_block->i_pts );
- }
- if( !aout_DateGet( &p_sys->end_date ) )
- {
- /* We've just started the stream, wait for the first PTS. */
- if( p_block ) block_Release( p_block );
- return NULL;
- }
- *pp_block = NULL; /* To avoid being fed the same packet again */
- if( p_sys->b_packetizer )
- {
- return SendPacket( p_dec, p_oggpacket, p_block );
- }
- else
- {
- aout_buffer_t *p_aout_buffer;
- if( p_sys->i_headers >= p_sys->p_header->extra_headers + 2 )
- p_aout_buffer = DecodePacket( p_dec, p_oggpacket );
- else
- p_aout_buffer = NULL; /* Skip headers */
- if( p_block ) block_Release( p_block );
- return p_aout_buffer;
- }
- }
- /*****************************************************************************
- * DecodePacket: decodes a Speex packet.
- *****************************************************************************/
- static aout_buffer_t *DecodePacket( decoder_t *p_dec, ogg_packet *p_oggpacket )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- if( p_oggpacket->bytes )
- {
- /* Copy Ogg packet to Speex bitstream */
- speex_bits_read_from( &p_sys->bits, p_oggpacket->packet,
- p_oggpacket->bytes );
- p_sys->i_frame_in_packet = 0;
- }
- /* Decode one frame at a time */
- if( p_sys->i_frame_in_packet < p_sys->p_header->frames_per_packet )
- {
- aout_buffer_t *p_aout_buffer;
- int i_ret;
- p_aout_buffer =
- p_dec->pf_aout_buffer_new( p_dec, p_sys->p_header->frame_size );
- if( !p_aout_buffer )
- {
- return NULL;
- }
- i_ret = speex_decode( p_sys->p_state, &p_sys->bits,
- (int16_t *)p_aout_buffer->p_buffer );
- if( i_ret == -1 )
- {
- /* End of stream */
- return NULL;
- }
- if( i_ret== -2 )
- {
- msg_Warn( p_dec, "decoding error: corrupted stream?" );
- return NULL;
- }
- if( speex_bits_remaining( &p_sys->bits ) < 0 )
- {
- msg_Warn( p_dec, "decoding overflow: corrupted stream?" );
- }
- if( p_sys->p_header->nb_channels == 2 )
- speex_decode_stereo( (int16_t *)p_aout_buffer->p_buffer,
- p_sys->p_header->frame_size, &p_sys->stereo );
- /* Date management */
- p_aout_buffer->start_date = aout_DateGet( &p_sys->end_date );
- p_aout_buffer->end_date =
- aout_DateIncrement( &p_sys->end_date, p_sys->p_header->frame_size);
- p_sys->i_frame_in_packet++;
- return p_aout_buffer;
- }
- else
- {
- return NULL;
- }
- }
- /*****************************************************************************
- * SendPacket: send an ogg packet to the stream output.
- *****************************************************************************/
- static block_t *SendPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
- block_t *p_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- /* Date management */
- p_block->i_dts = p_block->i_pts = aout_DateGet( &p_sys->end_date );
- if( p_sys->i_headers >= p_sys->p_header->extra_headers + 2 )
- p_block->i_length =
- aout_DateIncrement( &p_sys->end_date,
- p_sys->p_header->frame_size ) -
- p_block->i_pts;
- else
- p_block->i_length = 0;
- return p_block;
- }
- /*****************************************************************************
- * ParseSpeexComments: FIXME should be done in demuxer
- *****************************************************************************/
- #define readint(buf, base) (((buf[base+3]<<24)&0xff000000)|
- ((buf[base+2]<<16)&0xff0000)|
- ((buf[base+1]<<8)&0xff00)|
- (buf[base]&0xff))
- static void ParseSpeexComments( decoder_t *p_dec, ogg_packet *p_oggpacket )
- {
- input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
- decoder_sys_t *p_sys = p_dec->p_sys;
- char *p_buf = (char *)p_oggpacket->packet;
- const SpeexMode *p_mode;
- int i_len;
- if( p_input->i_object_type != VLC_OBJECT_INPUT ) return;
- p_mode = speex_mode_list[p_sys->p_header->mode];
- input_Control( p_input, INPUT_ADD_INFO, _("Speex comment"), _("Mode"),
- "%s%s", p_mode->modeName,
- p_sys->p_header->vbr ? " VBR" : "" );
- if( p_oggpacket->bytes < 8 )
- {
- msg_Warn( p_dec, "invalid/corrupted comments" );
- return;
- }
- i_len = readint( p_buf, 0 ); p_buf += 4;
- if( i_len > p_oggpacket->bytes - 4 )
- {
- msg_Warn( p_dec, "invalid/corrupted comments" );
- return;
- }
- input_Control( p_input, INPUT_ADD_INFO, _("Speex comment"), p_buf, "" );
- /* TODO: finish comments parsing */
- }
- /*****************************************************************************
- * CloseDecoder: speex decoder destruction
- *****************************************************************************/
- static void CloseDecoder( vlc_object_t *p_this )
- {
- decoder_t * p_dec = (decoder_t *)p_this;
- decoder_sys_t *p_sys = p_dec->p_sys;
- if( p_sys->p_state )
- {
- speex_decoder_destroy( p_sys->p_state );
- speex_bits_destroy( &p_sys->bits );
- }
- if( p_sys->p_header ) free( p_sys->p_header );
- free( p_sys );
- }
- /*****************************************************************************
- * encoder_sys_t: encoder descriptor
- *****************************************************************************/
- #define MAX_FRAME_SIZE 2000
- #define MAX_FRAME_BYTES 2000
- struct encoder_sys_t
- {
- /*
- * Input properties
- */
- char *p_buffer;
- char p_buffer_out[MAX_FRAME_BYTES];
- /*
- * Speex properties
- */
- SpeexBits bits;
- SpeexHeader header;
- SpeexStereoState stereo;
- void *p_state;
- int i_frames_per_packet;
- int i_frames_in_packet;
- int i_frame_length;
- int i_samples_delay;
- int i_frame_size;
- /*
- * Common properties
- */
- mtime_t i_pts;
- };
- /*****************************************************************************
- * OpenEncoder: probe the encoder and return score
- *****************************************************************************/
- static int OpenEncoder( vlc_object_t *p_this )
- {
- encoder_t *p_enc = (encoder_t *)p_this;
- encoder_sys_t *p_sys;
- const SpeexMode *p_speex_mode = &speex_nb_mode;
- int i_quality, i;
- char *pp_header[2];
- int pi_header[2];
- uint8_t *p_extra;
- if( p_enc->fmt_out.i_codec != VLC_FOURCC('s','p','x',' ') &&
- !p_enc->b_force )
- {
- return VLC_EGENERIC;
- }
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
- {
- msg_Err( p_enc, "out of memory" );
- return VLC_EGENERIC;
- }
- p_enc->p_sys = p_sys;
- p_enc->pf_encode_audio = Encode;
- p_enc->fmt_in.i_codec = AOUT_FMT_S16_NE;
- p_enc->fmt_out.i_codec = VLC_FOURCC('s','p','x',' ');
- speex_init_header( &p_sys->header, p_enc->fmt_in.audio.i_rate,
- 1, p_speex_mode );
- p_sys->header.frames_per_packet = 1;
- p_sys->header.vbr = 1;
- p_sys->header.nb_channels = p_enc->fmt_in.audio.i_channels;
- /* Create a new encoder state in narrowband mode */
- p_sys->p_state = speex_encoder_init( p_speex_mode );
- /* Set the quality to 8 (15 kbps) */
- i_quality = 8;
- speex_encoder_ctl( p_sys->p_state, SPEEX_SET_QUALITY, &i_quality );
- /*Initialization of the structure that holds the bits*/
- speex_bits_init( &p_sys->bits );
- p_sys->i_frames_in_packet = 0;
- p_sys->i_samples_delay = 0;
- p_sys->i_pts = 0;
- speex_encoder_ctl( p_sys->p_state, SPEEX_GET_FRAME_SIZE,
- &p_sys->i_frame_length );
- p_sys->i_frame_size = p_sys->i_frame_length *
- sizeof(int16_t) * p_enc->fmt_in.audio.i_channels;
- p_sys->p_buffer = malloc( p_sys->i_frame_size );
- /* Create and store headers */
- pp_header[0] = speex_header_to_packet( &p_sys->header, &pi_header[0] );
- pp_header[1] = "ENCODER=VLC media player";
- pi_header[1] = sizeof("ENCODER=VLC media player");
- p_enc->fmt_out.i_extra = 3 * 2 + pi_header[0] + pi_header[1];
- p_extra = p_enc->fmt_out.p_extra = malloc( p_enc->fmt_out.i_extra );
- for( i = 0; i < 2; i++ )
- {
- *(p_extra++) = pi_header[i] >> 8;
- *(p_extra++) = pi_header[i] & 0xFF;
- memcpy( p_extra, pp_header[i], pi_header[i] );
- p_extra += pi_header[i];
- }
- msg_Dbg( p_enc, "encoding: frame size:%d, channels:%d, samplerate:%d",
- p_sys->i_frame_size, p_enc->fmt_in.audio.i_channels,
- p_enc->fmt_in.audio.i_rate );
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * Encode: the whole thing
- ****************************************************************************
- * This function spits out ogg packets.
- ****************************************************************************/
- static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
- {
- encoder_sys_t *p_sys = p_enc->p_sys;
- block_t *p_block, *p_chain = NULL;
- char *p_buffer = p_aout_buf->p_buffer;
- int i_samples = p_aout_buf->i_nb_samples;
- int i_samples_delay = p_sys->i_samples_delay;
- p_sys->i_pts = p_aout_buf->start_date -
- (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
- (mtime_t)p_enc->fmt_in.audio.i_rate;
- p_sys->i_samples_delay += i_samples;
- while( p_sys->i_samples_delay >= p_sys->i_frame_length )
- {
- int16_t *p_samples;
- int i_out;
- if( i_samples_delay )
- {
- /* Take care of the left-over from last time */
- int i_delay_size = i_samples_delay * 2 *
- p_enc->fmt_in.audio.i_channels;
- int i_size = p_sys->i_frame_size - i_delay_size;
- p_samples = (int16_t *)p_sys->p_buffer;
- memcpy( p_sys->p_buffer + i_delay_size, p_buffer, i_size );
- p_buffer -= i_delay_size;
- i_samples += i_samples_delay;
- i_samples_delay = 0;
- }
- else
- {
- p_samples = (int16_t *)p_buffer;
- }
- /* Encode current frame */
- if( p_enc->fmt_in.audio.i_channels == 2 )
- speex_encode_stereo( p_samples, p_sys->i_frame_length,
- &p_sys->bits );
- #if 0
- if( p_sys->preprocess )
- speex_preprocess( p_sys->preprocess, p_samples, NULL );
- #endif
- speex_encode( p_sys->p_state, p_samples, &p_sys->bits );
- p_buffer += p_sys->i_frame_size;
- p_sys->i_samples_delay -= p_sys->i_frame_length;
- i_samples -= p_sys->i_frame_length;
- p_sys->i_frames_in_packet++;
- if( p_sys->i_frames_in_packet < p_sys->header.frames_per_packet )
- continue;
- p_sys->i_frames_in_packet = 0;
- speex_bits_insert_terminator( &p_sys->bits );
- i_out = speex_bits_write( &p_sys->bits, p_sys->p_buffer_out,
- MAX_FRAME_BYTES );
- speex_bits_reset( &p_sys->bits );
- p_block = block_New( p_enc, i_out );
- memcpy( p_block->p_buffer, p_sys->p_buffer_out, i_out );
- p_block->i_length = (mtime_t)1000000 *
- (mtime_t)p_sys->i_frame_length * p_sys->header.frames_per_packet /
- (mtime_t)p_enc->fmt_in.audio.i_rate;
- p_block->i_dts = p_block->i_pts = p_sys->i_pts;
- /* Update pts */
- p_sys->i_pts += p_block->i_length;
- block_ChainAppend( &p_chain, p_block );
- }
- /* Backup the remaining raw samples */
- if( i_samples )
- {
- memcpy( p_sys->p_buffer + i_samples_delay * 2 *
- p_enc->fmt_in.audio.i_channels, p_buffer,
- i_samples * 2 * p_enc->fmt_in.audio.i_channels );
- }
- return p_chain;
- }
- /*****************************************************************************
- * CloseEncoder: encoder destruction
- *****************************************************************************/
- static void CloseEncoder( vlc_object_t *p_this )
- {
- encoder_t *p_enc = (encoder_t *)p_this;
- encoder_sys_t *p_sys = p_enc->p_sys;
- speex_encoder_destroy( p_sys->p_state );
- speex_bits_destroy( &p_sys->bits );
- if( p_sys->p_buffer ) free( p_sys->p_buffer );
- free( p_sys );
- }