1 /*****************************************************************************
2 * shine_mod.c: MP3 encoder using Shine, a fixed point implementation
3 *****************************************************************************
4 * Copyright (C) 2008-2009 M2X
6 * Authors: Rafaël Carré <rcarre@m2x.nl>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
30 #include <vlc_common.h>
31 #include <vlc_plugin.h>
32 #include <vlc_codec.h>
33 #include <vlc_block.h>
34 #include <vlc_block_helper.h>
40 /* shine.c uses a lot of static variables, so we include the C file to keep
42 * Note that it makes this decoder non reentrant, this is why we have the
43 * struct entrant below */
50 unsigned int i_buffer;
54 /*****************************************************************************
56 *****************************************************************************/
57 static int OpenEncoder ( vlc_object_t * );
58 static void CloseEncoder ( vlc_object_t * );
60 static block_t *EncodeFrame ( encoder_t *, block_t * );
63 set_category( CAT_INPUT );
64 set_subcategory( SUBCAT_INPUT_ACODEC );
65 set_description( _("MP3 fixed point audio encoder") );
66 set_capability( "encoder", 50 );
67 set_callbacks( OpenEncoder, CloseEncoder );
74 } entrant = { false, VLC_STATIC_MUTEX, };
76 static int OpenEncoder( vlc_object_t *p_this )
78 encoder_t *p_enc = (encoder_t*)p_this;
81 /* shine is an 'MP3' encoder */
82 if( (p_enc->fmt_out.i_codec != VLC_CODEC_MP3 && p_enc->fmt_out.i_codec != VLC_CODEC_MPGA) ||
83 p_enc->fmt_out.audio.i_channels > 2 )
86 /* Shine is strict on its input */
87 if( p_enc->fmt_in.audio.i_channels != 2 )
89 msg_Err( p_enc, "Only stereo input is accepted, rejecting %d channels",
90 p_enc->fmt_in.audio.i_channels );
94 if( p_enc->fmt_out.i_bitrate <= 0 )
96 msg_Err( p_enc, "unknown bitrate" );
100 msg_Dbg( p_enc, "bitrate %d, samplerate %d, channels %d",
101 p_enc->fmt_out.i_bitrate, p_enc->fmt_out.audio.i_rate,
102 p_enc->fmt_out.audio.i_channels );
104 vlc_mutex_lock( &entrant.lock );
107 msg_Err( p_enc, "encoder already in progress" );
108 vlc_mutex_unlock( &entrant.lock );
112 vlc_mutex_unlock( &entrant.lock );
114 p_enc->p_sys = p_sys = calloc( 1, sizeof( *p_sys ) );
118 if( !( p_sys->p_fifo = block_FifoNew() ) )
124 init_mp3_encoder_engine( p_enc->fmt_out.audio.i_rate,
125 p_enc->fmt_out.audio.i_channels, p_enc->fmt_out.i_bitrate / 1000 );
127 p_enc->pf_encode_audio = EncodeFrame;
128 p_enc->fmt_out.i_cat = AUDIO_ES;
133 vlc_mutex_lock( &entrant.lock );
134 entrant.busy = false;
135 vlc_mutex_unlock( &entrant.lock );
139 /* We split/pack PCM blocks to a fixed size: pcm_chunk_size bytes */
140 static block_t *GetPCM( encoder_t *p_enc, block_t *p_block )
142 encoder_sys_t *p_sys = p_enc->p_sys;
143 block_t *p_pcm_block;
145 if( !p_block ) goto buffered; /* just return a block if we can */
147 /* Put the PCM samples sent by VLC in the Fifo */
148 while( p_sys->i_buffer + p_block->i_buffer >= pcm_chunk_size )
150 unsigned int i_buffer = 0;
151 p_pcm_block = block_Alloc( pcm_chunk_size );
155 if( p_sys->i_buffer )
157 memcpy( p_pcm_block->p_buffer, p_sys->p_buffer, p_sys->i_buffer );
159 i_buffer = p_sys->i_buffer;
161 free( p_sys->p_buffer );
164 memcpy( p_pcm_block->p_buffer + i_buffer,
165 p_block->p_buffer, pcm_chunk_size - i_buffer );
166 p_block->p_buffer += pcm_chunk_size - i_buffer;
168 p_block->i_buffer -= pcm_chunk_size - i_buffer;
170 block_FifoPut( p_sys->p_fifo, p_pcm_block );
173 /* We hadn't enough data to make a block, put it in standby */
174 if( p_block->i_buffer )
178 if( p_sys->i_buffer > 0 )
179 p_tmp = realloc( p_sys->p_buffer, p_block->i_buffer + p_sys->i_buffer );
181 p_tmp = malloc( p_block->i_buffer );
186 free( p_sys->p_buffer );
187 p_sys->p_buffer = NULL;
190 p_sys->p_buffer = p_tmp;
191 memcpy( p_sys->p_buffer + p_sys->i_buffer,
192 p_block->p_buffer, p_block->i_buffer );
194 p_sys->i_buffer += p_block->i_buffer;
195 p_block->i_buffer = 0;
199 /* and finally get a block back */
200 return block_FifoCount( p_sys->p_fifo ) > 0 ? block_FifoGet( p_sys->p_fifo ) : NULL;
203 static block_t *EncodeFrame( encoder_t *p_enc, block_t *p_block )
205 block_t *p_pcm_block;
206 block_t *p_chain = NULL;
207 unsigned int i_samples = p_block->i_buffer >> 2 /* s16l stereo */;
208 mtime_t start_date = p_block->i_pts;
209 start_date -= (mtime_t)i_samples * (mtime_t)1000000 / (mtime_t)p_enc->fmt_out.audio.i_rate;
214 p_pcm_block = GetPCM( p_enc, p_block );
218 p_block = NULL; /* we don't need it anymore */
220 uint32_t enc_buffer[16384]; /* storage for 65536 Bytes XXX: too much */
221 struct enc_chunk_hdr *chunk = (void*) enc_buffer;
222 chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
224 encode_frame( (char*)p_pcm_block->p_buffer, chunk );
225 block_Release( p_pcm_block );
227 block_t *p_mp3_block = block_Alloc( chunk->enc_size );
231 memcpy( p_mp3_block->p_buffer, chunk->enc_data, chunk->enc_size );
233 /* date management */
234 p_mp3_block->i_length = SAMP_PER_FRAME1 * 1000000 /
235 p_enc->fmt_out.audio.i_rate;
237 start_date += p_mp3_block->i_length;
238 p_mp3_block->i_dts = p_mp3_block->i_pts = start_date;
240 p_mp3_block->i_nb_samples = SAMP_PER_FRAME1;
242 block_ChainAppend( &p_chain, p_mp3_block );
244 } while( p_pcm_block );
249 static void CloseEncoder( vlc_object_t *p_this )
251 encoder_sys_t *p_sys = ((encoder_t*)p_this)->p_sys;
253 vlc_mutex_lock( &entrant.lock );
254 entrant.busy = false;
255 vlc_mutex_unlock( &entrant.lock );
257 /* TODO: we should send the last PCM block padded with 0
258 * But we don't know if other blocks will come before it's too late */
259 if( p_sys->i_buffer )
260 free( p_sys->p_buffer );
262 block_FifoRelease( p_sys->p_fifo );