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
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 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 General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, 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>
34 #include <vlc_block.h>
35 #include <vlc_block_helper.h>
41 /* shine.c uses a lot of static variables, so we include the C file to keep
43 * Note that it makes this decoder non reentrant, this is why we set
44 * b_reentrant to VLC_FALSE in the module initialisation */
51 unsigned int i_buffer;
55 /*****************************************************************************
57 *****************************************************************************/
58 static int OpenEncoder ( vlc_object_t * );
59 static void CloseEncoder ( vlc_object_t * );
61 static block_t *EncodeFrame ( encoder_t *, aout_buffer_t * );
64 set_category( CAT_INPUT );
65 set_subcategory( SUBCAT_INPUT_ACODEC );
66 set_description( _("MP3 fixed point audio encoder") );
67 set_capability( "encoder", 50 );
68 set_callbacks( OpenEncoder, CloseEncoder );
71 static int OpenEncoder( vlc_object_t *p_this )
73 encoder_t *p_enc = (encoder_t*)p_this;
76 /* FIXME: what about layers 1 and 2 ? shine is an 'MP3' encoder */
77 if( p_enc->fmt_out.i_codec != VLC_CODEC_MP3 ||
78 p_enc->fmt_out.audio.i_channels > 2 )
81 /* Shine is strict on its input */
82 if( p_enc->fmt_in.audio.i_channels != 2 )
84 msg_Err( p_enc, "Only stereo input is accepted, rejecting %d channels",
85 p_enc->fmt_in.audio.i_channels );
89 if( p_enc->fmt_out.i_bitrate <= 0 )
91 msg_Err( p_enc, "unknown bitrate" );
95 msg_Dbg( p_enc, "bitrate %d, samplerate %d, channels %d",
96 p_enc->fmt_out.i_bitrate, p_enc->fmt_out.audio.i_rate,
97 p_enc->fmt_out.audio.i_channels );
99 p_enc->p_sys = p_sys = calloc( 1, sizeof( *p_sys ) );
103 if( !( p_sys->p_fifo = block_FifoNew() ) )
109 init_mp3_encoder_engine( p_enc->fmt_out.audio.i_rate,
110 p_enc->fmt_out.audio.i_channels, p_enc->fmt_out.i_bitrate / 1000 );
112 p_enc->pf_encode_audio = EncodeFrame;
113 p_enc->fmt_out.i_cat = AUDIO_ES;
118 /* We split/pack PCM blocks to a fixed size: pcm_chunk_size bytes */
119 static block_t *GetPCM( encoder_t *p_enc, aout_buffer_t *p_block )
121 encoder_sys_t *p_sys = p_enc->p_sys;
122 block_t *p_pcm_block;
124 if( !p_block ) goto buffered; /* just return a block if we can */
126 /* Put the PCM samples sent by VLC in the Fifo */
127 while( p_sys->i_buffer + p_block->i_nb_bytes >= pcm_chunk_size )
129 unsigned int i_buffer = 0;
130 p_pcm_block = block_New( p_enc, pcm_chunk_size );
134 if( p_sys->i_buffer )
136 vlc_memcpy( p_pcm_block->p_buffer, p_sys->p_buffer, p_sys->i_buffer );
138 i_buffer = p_sys->i_buffer;
140 free( p_sys->p_buffer );
143 vlc_memcpy( p_pcm_block->p_buffer + i_buffer,
144 p_block->p_buffer, pcm_chunk_size - i_buffer );
145 p_block->p_buffer += pcm_chunk_size - i_buffer;
147 p_block->i_nb_bytes -= pcm_chunk_size - i_buffer;
149 block_FifoPut( p_sys->p_fifo, p_pcm_block );
152 /* We hadn't enough data to make a block, put it in standby */
153 if( p_block->i_nb_bytes )
157 if( p_sys->i_buffer > 0 )
158 p_tmp = realloc( p_sys->p_buffer, p_block->i_nb_bytes + p_sys->i_buffer );
160 p_tmp = malloc( p_block->i_nb_bytes );
165 free( p_sys->p_buffer );
166 p_sys->p_buffer = NULL;
169 p_sys->p_buffer = p_tmp;
170 vlc_memcpy( p_sys->p_buffer + p_sys->i_buffer,
171 p_block->p_buffer, p_block->i_nb_bytes );
173 p_sys->i_buffer += p_block->i_nb_bytes;
174 p_block->i_nb_bytes = 0;
178 /* and finally get a block back */
179 return block_FifoCount( p_sys->p_fifo ) > 0 ? block_FifoGet( p_sys->p_fifo ) : NULL;
182 static block_t *EncodeFrame( encoder_t *p_enc, aout_buffer_t *p_block )
184 block_t *p_pcm_block;
185 block_t *p_chain = NULL;
186 unsigned int i_samples = p_block->i_nb_bytes >> 2 /* s16l stereo */;
187 mtime_t start_date = p_block->start_date;
188 start_date -= (mtime_t)i_samples * (mtime_t)1000000 / (mtime_t)p_enc->fmt_out.audio.i_rate;
193 p_pcm_block = GetPCM( p_enc, p_block );
197 p_block = NULL; /* we don't need it anymore */
199 uint32_t enc_buffer[16384]; /* storage for 65536 Bytes XXX: too much */
200 struct enc_chunk_hdr *chunk = (void*) enc_buffer;
201 chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
203 encode_frame( (char*)p_pcm_block->p_buffer, chunk );
204 block_Release( p_pcm_block );
206 block_t *p_mp3_block = block_New( p_enc, chunk->enc_size );
210 vlc_memcpy( p_mp3_block->p_buffer, chunk->enc_data, chunk->enc_size );
212 /* date management */
213 p_mp3_block->i_length = SAMP_PER_FRAME1 * 1000000 /
214 p_enc->fmt_out.audio.i_rate;
216 start_date += p_mp3_block->i_length;
217 p_mp3_block->i_dts = p_mp3_block->i_pts = start_date;
219 p_mp3_block->i_samples = SAMP_PER_FRAME1;
221 block_ChainAppend( &p_chain, p_mp3_block );
223 } while( p_pcm_block );
228 static void CloseEncoder( vlc_object_t *p_this )
230 encoder_sys_t *p_sys = ((encoder_t*)p_this)->p_sys;
232 /* TODO: we should send the last PCM block padded with 0
233 * But we don't know if other blocks will come before it's too late */
234 if( p_sys->i_buffer )
235 free( p_sys->p_buffer );
237 block_FifoRelease( p_sys->p_fifo );