-/*
- * Copyright (C) 1997-2013 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file afh_common.c Common audio format handler functions. */
#include "string.h"
#include "afh.h"
-/* The mp3 audio format handler does not need any libs. */
-void mp3_init(struct audio_format_handler *);
-
-#ifdef HAVE_OGGVORBIS
- void ogg_init(struct audio_format_handler *);
-#endif
-#ifdef HAVE_FAAD
- void aac_afh_init(struct audio_format_handler *);
-#endif
-#ifdef HAVE_SPEEX
- void spx_afh_init(struct audio_format_handler *);
-#endif
-#ifdef HAVE_FLAC
- void flac_afh_init(struct audio_format_handler *);
-#endif
-
-#ifdef HAVE_OPUS
- void opus_afh_init(struct audio_format_handler *);
-#endif
+typedef void afh_init_func(struct audio_format_handler *);
-void wma_afh_init(struct audio_format_handler *);
+/*
+ * Declaration of the audio format handler init functions.
+ *
+ * These symbols are referenced in the afl array below.
+ *
+ * Most audio format handlers depend on an external library and are not
+ * compiled in if the library is not installed. Hence it is well possible that
+ * not all of these functions are defined. It does not hurt to declare them
+ * anyway, and this avoids another set of ifdefs.
+ */
+extern afh_init_func mp3_afh_init, ogg_afh_init, aac_afh_init, wma_afh_init,
+ spx_afh_init, flac_afh_init, opus_afh_init;
/** The list of all status items */
-const char *status_item_list[] = {STATUS_ITEM_ARRAY};
+const char *status_item_list[] = {STATUS_ITEMS};
/**
* The list of supported audio formats.
*
* We always define the full array of audio formats even if some audio formats
* were not compiled in. This is because for each audio file the number of its
- * audio format is stored in the database. We don't want that numbers to become
+ * audio format is stored in the database. We don't want these numbers to become
* stale just because the user installed a new version of paraslash that
* supports a different set of audio formats.
*
static struct audio_format_handler afl[] = {
{
.name = "mp3",
- .init = mp3_init,
+ .init = mp3_afh_init,
},
{
.name = "ogg",
-#ifdef HAVE_OGGVORBIS
- .init = ogg_init,
+#if defined(HAVE_OGG) && defined(HAVE_VORBIS)
+ .init = ogg_afh_init,
#endif
},
{
.name = "aac",
-#ifdef HAVE_FAAD
+#if defined(HAVE_FAAD)
.init = aac_afh_init,
#endif
},
},
{
.name = "spx",
-#ifdef HAVE_SPEEX
+#if defined(HAVE_OGG) && defined(HAVE_SPEEX)
.init = spx_afh_init,
#endif
},
{
.name = "flac",
-#ifdef HAVE_FLAC
+#if defined(HAVE_OGG) && defined(HAVE_FLAC)
.init = flac_afh_init,
#endif
},
{
.name = "opus",
-#ifdef HAVE_OPUS
+#if defined(HAVE_OGG) && defined(HAVE_OPUS)
.init = opus_afh_init,
#endif
},
if (afl[format].init)
return format;
}
-
}
/** Iterate over each supported audio format. */
{
int i;
- PARA_INFO_LOG("supported audio formats: %s\n", AUDIO_FORMAT_HANDLERS);
+ PARA_NOTICE_LOG("supported audio formats: %s\n", AUDIO_FORMAT_HANDLERS);
FOR_EACH_AUDIO_FORMAT(i) {
- PARA_NOTICE_LOG("initializing %s handler\n",
+ PARA_INFO_LOG("initializing %s handler\n",
audio_format_name(i));
afl[i].init(&afl[i]);
}
}
+/**
+ * Tell whether an audio format handler provides chunk tables.
+ *
+ * Each audio format handler either provides a chunk table or supports dynamic
+ * chunks.
+ *
+ * \param audio_format_id Offset in the afl array.
+ *
+ * \return True if dynamic chunks are supported, false if the audio format
+ * handler provides chunk tables.
+ */
+bool afh_supports_dynamic_chunks(int audio_format_id)
+{
+ return afl[audio_format_id].get_chunk;
+}
+
/**
* Guess the audio format judging from filename.
*
return -E_AUDIO_FORMAT;
}
+/**
+ * Get the name of the given audio format.
+ *
+ * \param i The audio format number.
+ *
+ * \return This returns a pointer to statically allocated memory so it
+ * must not be freed by the caller.
+ */
+const char *audio_format_name(int i)
+{
+ if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
+ return "???";
+ return afl[i].name;
+}
+
+static int get_file_info(int format, const char *path, char *data,
+ size_t size, int fd, struct afh_info *afhi)
+{
+ int ret;
+ const char *fmt = audio_format_name(format);
+
+ memset(afhi, 0, sizeof(*afhi));
+ ret = afl[format].get_file_info(data, size, fd, afhi);
+ if (ret < 0) {
+ PARA_WARNING_LOG("%s: %s format not detected: %s\n",
+ path, fmt, para_strerror(-ret));
+ return ret;
+ }
+ PARA_NOTICE_LOG("%s: detected %s format\n", path, fmt);
+ return format;
+}
+
/**
* Call get_file_info() to obtain an afhi structure.
*
{
int ret, i, format;
- afhi->header_len = 0;
- afhi->techinfo = NULL;
- afhi->tags.artist = NULL;
- afhi->tags.title = NULL;
- afhi->tags.year = NULL;
- afhi->tags.album = NULL;
- afhi->tags.comment = NULL;
format = guess_audio_format(path);
-
if (format >= 0) {
- ret = afl[format].get_file_info(data, size, fd, afhi);
- if (ret >= 0) {
- ret = format;
+ ret = get_file_info(format, path, data, size, fd, afhi);
+ if (ret >= 0)
goto success;
- }
}
FOR_EACH_AUDIO_FORMAT(i) {
if (i == format) /* we already tried this one to no avail */
continue;
- ret = afl[i].get_file_info(data, size, fd, afhi);
- if (ret >= 0) {
- ret = i;
+ ret = get_file_info(i, path, data, size, fd, afhi);
+ if (ret >= 0)
goto success;
- }
- PARA_WARNING_LOG("%s\n", para_strerror(-ret));
}
return -E_AUDIO_FORMAT;
success:
}
/**
- * Deallocate contents of a filled-in ahi structure
+ * Deallocate the contents of an afh_info structure.
*
* \param afhi The structure to clear.
*
- * The given pointer is kept, everything else is freed.
+ * This only frees the memory the various pointer fields of \a afhi point to.
+ * It does *not* free \a afhi itself.
*/
void clear_afhi(struct afh_info *afhi)
{
free(afhi->tags.comment);
}
-/**
- * Get the name of the given audio format.
- *
- * \param i The audio format number.
- *
- * \return This returns a pointer to statically allocated memory so it
- * must not be freed by the caller.
- */
-const char *audio_format_name(int i)
+static inline size_t get_chunk_len(long unsigned chunk_num,
+ const struct afh_info *afhi)
{
- if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
- return "???";
- return afl[i].name;
+ return afhi->chunk_table[chunk_num + 1] - afhi->chunk_table[chunk_num];
}
/**
* Get one chunk of audio data.
*
+ * This implicitly calls the ->open method of the audio format handler at the
+ * first call.
+ *
* \param chunk_num The number of the chunk to get.
* \param afhi Describes the audio file.
+ * \param audio_format_id Determines the afh.
* \param map The memory mapped audio file.
+ * \param mapsize Passed to the afh's ->open() method.
* \param buf Result pointer.
* \param len The length of the chunk in bytes.
+ * \param afh_context Value/result, determines whether ->open() is called.
*
* Upon return, \a buf will point so memory inside \a map. The returned buffer
* must therefore not be freed by the caller.
+ *
+ * \return Standard.
+ */
+__must_check int afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
+ uint8_t audio_format_id, const void *map, size_t mapsize,
+ const char **buf, size_t *len, void **afh_context)
+{
+ struct audio_format_handler *afh = afl + audio_format_id;
+
+ if (afh_supports_dynamic_chunks(audio_format_id)) {
+ int ret;
+
+ if (!*afh_context) {
+ ret = afh->open(map, mapsize, afh_context);
+ if (ret < 0)
+ return ret;
+ }
+ ret = afl[audio_format_id].get_chunk(chunk_num, *afh_context,
+ buf, len);
+ if (ret < 0) {
+ afh->close(*afh_context);
+ *afh_context = NULL;
+ }
+ return ret;
+ } else {
+ size_t pos = afhi->chunk_table[chunk_num];
+ *buf = map + pos;
+ *len = get_chunk_len(chunk_num, afhi);
+ return 0;
+ }
+}
+
+/**
+ * Deallocate resources allocated due to dynamic chunk handling.
+ *
+ * This function should be called if afh_get_chunk() was called at least once.
+ * It is OK to call it even for audio formats which do not support dynamic
+ * chunks, in which case the function does nothing.
+ *
+ * \param afh_context As returned from the ->open method of the afh.
+ * \param audio_format_id Determines the afh.
+ */
+void afh_close(void *afh_context, uint8_t audio_format_id)
+{
+ struct audio_format_handler *afh = afl + audio_format_id;
+
+ if (!afh_supports_dynamic_chunks(audio_format_id))
+ return;
+ if (!afh->close)
+ return;
+ if (!afh_context)
+ return;
+ afh->close(afh_context);
+}
+
+/**
+ * Find a suitable start chunk.
+ *
+ * \param approx_chunk_num Upper bound for the chunk number to return.
+ * \param afhi Needed for the chunk table.
+ * \param audio_format_id Determines the afh.
+ *
+ * \return For audio format handlers which support dynamic chunks, the function
+ * returns the given chunk number. Otherwise it returns the first non-empty
+ * chunk <= \a approx_chunk_num.
+ *
+ * \sa \ref afh_get_chunk().
*/
-void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
- void *map, const char **buf, size_t *len)
+int32_t afh_get_start_chunk(int32_t approx_chunk_num,
+ const struct afh_info *afhi, uint8_t audio_format_id)
{
- size_t pos = afhi->chunk_table[chunk_num];
- *buf = map + pos;
- *len = afhi->chunk_table[chunk_num + 1] - pos;
+ int32_t k;
+
+ if (afh_supports_dynamic_chunks(audio_format_id))
+ return approx_chunk_num;
+
+ for (k = PARA_MAX(0, approx_chunk_num); k >= 0; k--)
+ if (get_chunk_len(k, afhi) > 0)
+ return k;
+ return 0;
}
/**
"%s: %s\n" /* format */
"%s: %dHz\n" /* frequency */
"%s: %d\n" /* channels */
- "%s: %lu\n" /* seconds total */
+ "%s: %" PRIu32 "\n" /* seconds total */
"%s: %lu: %lu\n" /* chunk time */
- "%s: %lu\n" /* num chunks */
+ "%s: %" PRIu32 "\n" /* num chunks */
+ "%s: %" PRIu32 "\n" /* max chunk size */
"%s: %s\n" /* techinfo */
"%s: %s\n" /* artist */
"%s: %s\n" /* title */
"%s: %s\n" /* year */
"%s: %s\n" /* album */
"%s: %s\n", /* comment */
- status_item_list[SI_BITRATE], afhi->bitrate,
- status_item_list[SI_FORMAT], audio_format_name(audio_format_num),
- status_item_list[SI_FREQUENCY], afhi->frequency,
- status_item_list[SI_CHANNELS], afhi->channels,
- status_item_list[SI_SECONDS_TOTAL], afhi->seconds_total,
- status_item_list[SI_CHUNK_TIME], (long unsigned)afhi->chunk_tv.tv_sec,
+ status_item_list[SI_bitrate], afhi->bitrate,
+ status_item_list[SI_format], audio_format_name(audio_format_num),
+ status_item_list[SI_frequency], afhi->frequency,
+ status_item_list[SI_channels], afhi->channels,
+ status_item_list[SI_seconds_total], afhi->seconds_total,
+ status_item_list[SI_chunk_time], (long unsigned)afhi->chunk_tv.tv_sec,
(long unsigned)afhi->chunk_tv.tv_usec,
- status_item_list[SI_NUM_CHUNKS], afhi->chunks_total,
- status_item_list[SI_TECHINFO], afhi->techinfo? afhi->techinfo : "",
- status_item_list[SI_ARTIST], afhi->tags.artist? afhi->tags.artist : "",
- status_item_list[SI_TITLE], afhi->tags.title? afhi->tags.title : "",
- status_item_list[SI_YEAR], afhi->tags.year? afhi->tags.year : "",
- status_item_list[SI_ALBUM], afhi->tags.album? afhi->tags.album : "",
- status_item_list[SI_COMMENT], afhi->tags.comment? afhi->tags.comment : ""
+ status_item_list[SI_num_chunks], afhi->chunks_total,
+ status_item_list[SI_max_chunk_size], afhi->max_chunk_size,
+ status_item_list[SI_techinfo], afhi->techinfo? afhi->techinfo : "",
+ status_item_list[SI_artist], afhi->tags.artist? afhi->tags.artist : "",
+ status_item_list[SI_title], afhi->tags.title? afhi->tags.title : "",
+ status_item_list[SI_year], afhi->tags.year? afhi->tags.year : "",
+ status_item_list[SI_album], afhi->tags.album? afhi->tags.album : "",
+ status_item_list[SI_comment], afhi->tags.comment? afhi->tags.comment : ""
);
}
+
+/**
+ * Determine the maximal chunk size by investigating the chunk table.
+ *
+ * \param afhi Value/result.
+ *
+ * This function iterates over the chunk table and sets ->max_chunk_size
+ * accordingly. The function exists only for backward compatibility since as of
+ * version 0.6.0, para_server stores the maximal chunk size in its database.
+ * This function is only called if the database value is zero, indicating that
+ * the file was added by an older server version.
+ */
+void set_max_chunk_size(struct afh_info *afhi)
+{
+ uint32_t n, max = 0, old = 0;
+
+ for (n = 0; n <= afhi->chunks_total; n++) {
+ uint32_t val = afhi->chunk_table[n];
+ /*
+ * If the first chunk is the header, do not consider it for the
+ * calculation of the largest chunk size.
+ */
+ if (n == 0 || (n == 1 && afhi->header_len > 0)) {
+ old = val;
+ continue;
+ }
+ max = PARA_MAX(max, val - old);
+ old = val;
+ }
+ afhi->max_chunk_size = max;
+}
+
+/**
+ * Create a copy of the given file with altered meta tags.
+ *
+ * \param audio_format_id Specifies the audio format.
+ * \param map The (read-only) memory map of the input file.
+ * \param mapsize The size of the input file in bytes.
+ * \param tags The new tags.
+ * \param output_fd Altered file is created using this file descriptor.
+ * \param filename The name of the temporary output file.
+ *
+ * This calls the ->rewrite_tags method of the audio format handler associated
+ * with \a audio_format_id to create a copy of the memory-mapped file given
+ * by \a map and \a mapsize, but with altered tags according to \a tags. If
+ * the audio format handler for \a audio_format_id lacks this optional method,
+ * the function returns (the paraslash error code of) \p ENOTSUP.
+ *
+ * \return Standard.
+ */
+int afh_rewrite_tags(int audio_format_id, void *map, size_t mapsize,
+ struct taginfo *tags, int output_fd, const char *filename)
+{
+ struct audio_format_handler *afh = afl + audio_format_id;
+
+ if (!afh->rewrite_tags)
+ return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+ return afh->rewrite_tags(map, mapsize, tags, output_fd, filename);
+}
projects / paraslash.git / blobdiff