apps/codecs.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Björn Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef _CODECS_H_
  22 #define _CODECS_H_
  23
  24 /* instruct simulator code to not redefine any symbols when compiling codecs.
  25    (the CODEC macro is defined in apps/codecs/Makefile) */
  26 #ifdef CODEC
  27 #define NO_REDEFINES_PLEASE
  28 #endif
  29
  30 #ifndef MEM
  31 #define MEM 2
  32 #endif
  33
  34 #include <stdbool.h>
  35 #include <stdlib.h>
  36 #include "strlcpy.h"
  37 #include "config.h"
  38 #include "system.h"
  39 #include "metadata.h"
  40 #include "audio.h"
  41 #ifdef RB_PROFILE
  42 #include "profile.h"
  43 #include "thread.h"
  44 #endif
  45 #if (CONFIG_CODEC == SWCODEC)
  46 #ifdef HAVE_RECORDING
  47 #include "pcm_record.h"
  48 #endif
  49 #include "dsp.h"
  50 #endif
  51 #include "settings.h"
  52
  53 #include "gcc_extensions.h"
  54
  55 #ifdef CODEC
  56 #if defined(DEBUG) || defined(SIMULATOR)
  57 #undef DEBUGF
  58 #define DEBUGF  ci->debugf
  59 #undef LDEBUGF
  60 #define LDEBUGF ci->debugf
  61 #else
  62 #define DEBUGF(...)
  63 #define LDEBUGF(...)
  64 #endif
  65
  66 #ifdef ROCKBOX_HAS_LOGF
  67 #undef LOGF
  68 #define LOGF ci->logf
  69 #else
  70 #define LOGF(...)
  71 #endif
  72
  73 #endif
  74
  75 /* magic for normal codecs */
  76 #define CODEC_MAGIC 0x52434F44 /* RCOD */
  77 /* magic for encoder codecs */
  78 #define CODEC_ENC_MAGIC 0x52454E43 /* RENC */
  79
  80 /* increase this every time the api struct changes */
  81 #define CODEC_API_VERSION 34
  82
  83 /* update this to latest version if a change to the api struct breaks
  84    backwards compatibility (and please take the opportunity to sort in any
  85    new function which are "waiting" at the end of the function table) */
  86 #define CODEC_MIN_API_VERSION 34
  87
  88 /* codec return codes */
  89 enum codec_status {
  90     CODEC_OK = 0,
  91     CODEC_USB_CONNECTED,
  92     CODEC_ERROR = -1,
  93 };
  94
  95 /* NOTE: To support backwards compatibility, only add new functions at
  96          the end of the structure.  Every time you add a new function,
  97          remember to increase CODEC_API_VERSION.  If you make changes to the
  98          existing APIs then also update CODEC_MIN_API_VERSION to current
  99          version
 100  */
 101 struct codec_api {
 102
 103     off_t  filesize;          /* Total file length */
 104     off_t  curpos;            /* Current buffer position */
 105
 106     /* For gapless mp3 */
 107     struct mp3entry *id3;     /* TAG metadata pointer */
 108     bool *taginfo_ready;      /* Is metadata read */
 109
 110     /* Codec should periodically check if stop_codec is set to true.
 111        In case it is, codec must return immediately */
 112     bool stop_codec;
 113     /* Codec should periodically check if new_track is non zero.
 114        When it is, the codec should request a new track. */
 115     int new_track;
 116     /* If seek_time != 0, codec should seek to that song position (in ms)
 117        if codec supports seeking. */
 118     long seek_time;
 119
 120     /* The dsp instance to be used for audio output */
 121     struct dsp_config *dsp;
 122
 123     /* Returns buffer to malloc array. Only codeclib should need this. */
 124     void* (*codec_get_buffer)(size_t *size);
 125     /* Insert PCM data into audio buffer for playback. Playback will start
 126        automatically. */
 127     void (*pcmbuf_insert)(const void *ch1, const void *ch2, int count);
 128     /* Set song position in WPS (value in ms). */
 129     void (*set_elapsed)(unsigned long value);
 130
 131     /* Read next <size> amount bytes from file buffer to <ptr>.
 132        Will return number of bytes read or 0 if end of file. */
 133     size_t (*read_filebuf)(void *ptr, size_t size);
 134     /* Request pointer to file buffer which can be used to read
 135        <realsize> amount of data. <reqsize> tells the buffer system
 136        how much data it should try to allocate. If <realsize> is 0,
 137        end of file is reached. */
 138     void* (*request_buffer)(size_t *realsize, size_t reqsize);
 139     /* Advance file buffer position by <amount> amount of bytes. */
 140     void (*advance_buffer)(size_t amount);
 141     /* Advance file buffer to a pointer location inside file buffer. */
 142     void (*advance_buffer_loc)(void *ptr);
 143     /* Seek file buffer to position <newpos> beginning of file. */
 144     bool (*seek_buffer)(size_t newpos);
 145     /* Codec should call this function when it has done the seeking. */
 146     void (*seek_complete)(void);
 147     /* Request file change from file buffer. Returns true is next
 148        track is available and changed. If return value is false,
 149        codec should exit immediately with PLUGIN_OK status. */
 150     bool (*request_next_track)(void);
 151     /* Free the buffer area of the current codec after its loaded */
 152     void (*discard_codec)(void);
 153
 154     void (*set_offset)(size_t value);
 155     /* Configure different codec buffer parameters. */
 156     void (*configure)(int setting, intptr_t value);
 157
 158     /* kernel/ system */
 159 #ifdef CPU_ARM
 160     void (*__div0)(void);
 161 #endif
 162     void (*sleep)(int ticks);
 163     void (*yield)(void);
 164
 165 #if NUM_CORES > 1
 166     unsigned int
 167         (*create_thread)(void (*function)(void), void* stack,
 168                          size_t stack_size, unsigned flags, const char *name
 169                          IF_PRIO(, int priority)
 170                          IF_COP(, unsigned int core));
 171
 172     void (*thread_thaw)(unsigned int thread_id);
 173     void (*thread_wait)(unsigned int thread_id);
 174     void (*semaphore_init)(struct semaphore *s, int max, int start);
 175     void (*semaphore_wait)(struct semaphore *s);
 176     void (*semaphore_release)(struct semaphore *s);
 177 #endif /* NUM_CORES */
 178
 179 #if NUM_CORES > 1
 180     void (*cpucache_flush)(void);
 181     void (*cpucache_invalidate)(void);
 182 #endif
 183
 184     /* strings and memory */
 185     char* (*strcpy)(char *dst, const char *src);
 186     size_t (*strlen)(const char *str);
 187     int (*strcmp)(const char *, const char *);
 188     char *(*strcat)(char *s1, const char *s2);
 189     void* (*memset)(void *dst, int c, size_t length);
 190     void* (*memcpy)(void *out, const void *in, size_t n);
 191     void* (*memmove)(void *out, const void *in, size_t n);
 192     int (*memcmp)(const void *s1, const void *s2, size_t n);
 193     void *(*memchr)(const void *s1, int c, size_t n);
 194     char *(*strcasestr) (const char* phaystack, const char* pneedle);
 195
 196 #if defined(DEBUG) || defined(SIMULATOR)
 197     void (*debugf)(const char *fmt, ...) ATTRIBUTE_PRINTF(1, 2);
 198 #endif
 199 #ifdef ROCKBOX_HAS_LOGF
 200     void (*logf)(const char *fmt, ...) ATTRIBUTE_PRINTF(1, 2);
 201 #endif
 202
 203     /* Tremor requires qsort */
 204     void (*qsort)(void *base, size_t nmemb, size_t size,
 205                   int(*compar)(const void *, const void *));
 206
 207     /* The ADX codec accesses global_settings to test for REPEAT_ONE mode */
 208     struct user_settings* global_settings;
 209
 210 #ifdef RB_PROFILE
 211     void (*profile_thread)(void);
 212     void (*profstop)(void);
 213     void (*profile_func_enter)(void *this_fn, void *call_site);
 214     void (*profile_func_exit)(void *this_fn, void *call_site);
 215 #endif
 216
 217 #ifdef HAVE_RECORDING
 218     volatile bool   stop_encoder;
 219     volatile int    enc_codec_loaded; /* <0=error, 0=pending, >0=ok */
 220     void            (*enc_get_inputs)(struct enc_inputs *inputs);
 221     void            (*enc_set_parameters)(struct enc_parameters *params);
 222     struct enc_chunk_hdr * (*enc_get_chunk)(void);
 223     void            (*enc_finish_chunk)(void);
 224     unsigned char * (*enc_get_pcm_data)(size_t size);
 225     size_t          (*enc_unget_pcm_data)(size_t size);
 226
 227     /* file */
 228     int (*open)(const char* pathname, int flags, ...);
 229     int (*close)(int fd);
 230     ssize_t (*read)(int fd, void* buf, size_t count);
 231     off_t (*lseek)(int fd, off_t offset, int whence);
 232     ssize_t (*write)(int fd, const void* buf, size_t count);
 233     int (*round_value_to_list32)(unsigned long value,
 234                                  const unsigned long list[],
 235                                  int count,
 236                                  bool signd);
 237 #endif
 238
 239     /* new stuff at the end, sort into place next time
 240        the API gets incompatible */
 241 };
 242
 243 /* codec header */
 244 struct codec_header {
 245     unsigned long magic; /* RCOD or RENC */
 246     unsigned short target_id;
 247     unsigned short api_version;
 248     unsigned char *load_addr;
 249     unsigned char *end_addr;
 250     enum codec_status(*entry_point)(void);
 251     struct codec_api **api;
 252 };
 253
 254 extern unsigned char codecbuf[];
 255 extern size_t codec_size;
 256
 257 #ifdef CODEC
 258 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 259 /* plugin_* is correct, codecs use the plugin linker script */
 260 extern unsigned char plugin_start_addr[];
 261 extern unsigned char plugin_end_addr[];
 262 /* decoders */
 263 #define CODEC_HEADER \
 264         const struct codec_header __header \
 265         __attribute__ ((section (".header")))= { \
 266         CODEC_MAGIC, TARGET_ID, CODEC_API_VERSION, \
 267         plugin_start_addr, plugin_end_addr, codec_start, &ci };
 268 /* encoders */
 269 #define CODEC_ENC_HEADER \
 270         const struct codec_header __header \
 271         __attribute__ ((section (".header")))= { \
 272         CODEC_ENC_MAGIC, TARGET_ID, CODEC_API_VERSION, \
 273         plugin_start_addr, plugin_end_addr, codec_start, &ci };
 274
 275 #else /* def SIMULATOR */
 276 /* decoders */
 277 #define CODEC_HEADER \
 278         const struct codec_header __header \
 279         __attribute__((visibility("default"))) = { \
 280         CODEC_MAGIC, TARGET_ID, CODEC_API_VERSION, \
 281         NULL, NULL, codec_start, &ci };
 282 /* encoders */
 283 #define CODEC_ENC_HEADER \
 284         const struct codec_header __header = { \
 285         CODEC_ENC_MAGIC, TARGET_ID, CODEC_API_VERSION, \
 286         NULL, NULL, codec_start, &ci };
 287 #endif /* SIMULATOR */
 288 #endif /* CODEC */
 289
 290 /* create full codec path from root filenames in audio_formats[]
 291    assumes buffer size is MAX_PATH */
 292 void codec_get_full_path(char *path, const char *codec_root_fn);
 293
 294 /* defined by the codec loader (codec.c) */
 295 int codec_load_buf(unsigned int hid, struct codec_api *api);
 296 int codec_load_file(const char* codec, struct codec_api *api);
 297
 298 /* defined by the codec */
 299 enum codec_status codec_start(void);
 300 enum codec_status codec_main(void);
 301
 302 #endif