+
+/*****************************************************************************
+ * 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_int( 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_int( 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 );
+}