diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/decoder/mad_decoder_plugin.c | 91 | ||||
| -rw-r--r-- | src/tag_rva2.c | 110 | ||||
| -rw-r--r-- | src/tag_rva2.h | 39 |
3 files changed, 151 insertions, 89 deletions
diff --git a/src/decoder/mad_decoder_plugin.c b/src/decoder/mad_decoder_plugin.c index 037fdfb15..5aa09b336 100644 --- a/src/decoder/mad_decoder_plugin.c +++ b/src/decoder/mad_decoder_plugin.c @@ -21,6 +21,7 @@ #include "decoder_api.h" #include "conf.h" #include "tag_id3.h" +#include "tag_rva2.h" #include "audio_check.h" #include <assert.h> @@ -211,94 +212,6 @@ mp3_fill_buffer(struct mp3_data *data) } #ifdef HAVE_ID3TAG -/* Parse mp3 RVA2 frame. Shamelessly stolen from madplay. */ -static bool -parse_rva2(struct id3_tag *tag, struct replay_gain_info *replay_gain_info) -{ - struct id3_frame const * frame; - - id3_latin1_t const *id; - id3_byte_t const *data; - id3_length_t length; - - enum { - CHANNEL_OTHER = 0x00, - CHANNEL_MASTER_VOLUME = 0x01, - CHANNEL_FRONT_RIGHT = 0x02, - CHANNEL_FRONT_LEFT = 0x03, - CHANNEL_BACK_RIGHT = 0x04, - CHANNEL_BACK_LEFT = 0x05, - CHANNEL_FRONT_CENTRE = 0x06, - CHANNEL_BACK_CENTRE = 0x07, - CHANNEL_SUBWOOFER = 0x08 - }; - - /* relative volume adjustment information */ - - frame = id3_tag_findframe(tag, "RVA2", 0); - if (frame == NULL) - return false; - - id = id3_field_getlatin1(id3_frame_field(frame, 0)); - data = id3_field_getbinarydata(id3_frame_field(frame, 1), - &length); - - if (id == NULL || data == NULL) - return false; - - /* - * "The 'identification' string is used to identify the - * situation and/or device where this adjustment should apply. - * The following is then repeated for every channel - * - * Type of channel $xx - * Volume adjustment $xx xx - * Bits representing peak $xx - * Peak volume $xx (xx ...)" - */ - - while (length >= 4) { - unsigned int peak_bytes; - - peak_bytes = (data[3] + 7) / 8; - if (4 + peak_bytes > length) - break; - - if (data[0] == CHANNEL_MASTER_VOLUME) { - signed int voladj_fixed; - double voladj_float; - - /* - * "The volume adjustment is encoded as a fixed - * point decibel value, 16 bit signed integer - * representing (adjustment*512), giving +/- 64 - * dB with a precision of 0.001953125 dB." - */ - - voladj_fixed = (data[1] << 8) | (data[2] << 0); - voladj_fixed |= -(voladj_fixed & 0x8000); - - voladj_float = (double) voladj_fixed / 512; - - replay_gain_info->tuples[REPLAY_GAIN_TRACK].gain = voladj_float; - replay_gain_info->tuples[REPLAY_GAIN_ALBUM].gain = voladj_float; - - g_debug("parseRVA2: Relative Volume " - "%+.1f dB adjustment (%s)\n", - voladj_float, id); - - return true; - } - - data += 4 + peak_bytes; - length -= 4 + peak_bytes; - } - - return false; -} -#endif - -#ifdef HAVE_ID3TAG static bool parse_id3_replay_gain_info(struct replay_gain_info *replay_gain_info, struct id3_tag *tag) @@ -342,7 +255,7 @@ parse_id3_replay_gain_info(struct replay_gain_info *replay_gain_info, return found || /* fall back on RVA2 if no replaygain tags found */ - parse_rva2(tag, replay_gain_info); + tag_rva2_parse(tag, replay_gain_info); } #endif diff --git a/src/tag_rva2.c b/src/tag_rva2.c new file mode 100644 index 000000000..28002025b --- /dev/null +++ b/src/tag_rva2.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2003-2010 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "tag_rva2.h" +#include "replay_gain_info.h" + +#include <glib.h> +#include <id3tag.h> + +bool +tag_rva2_parse(struct id3_tag *tag, struct replay_gain_info *replay_gain_info) +{ + struct id3_frame const * frame; + + id3_latin1_t const *id; + id3_byte_t const *data; + id3_length_t length; + + enum { + CHANNEL_OTHER = 0x00, + CHANNEL_MASTER_VOLUME = 0x01, + CHANNEL_FRONT_RIGHT = 0x02, + CHANNEL_FRONT_LEFT = 0x03, + CHANNEL_BACK_RIGHT = 0x04, + CHANNEL_BACK_LEFT = 0x05, + CHANNEL_FRONT_CENTRE = 0x06, + CHANNEL_BACK_CENTRE = 0x07, + CHANNEL_SUBWOOFER = 0x08 + }; + + /* relative volume adjustment information */ + + frame = id3_tag_findframe(tag, "RVA2", 0); + if (frame == NULL) + return false; + + id = id3_field_getlatin1(id3_frame_field(frame, 0)); + data = id3_field_getbinarydata(id3_frame_field(frame, 1), + &length); + + if (id == NULL || data == NULL) + return false; + + /* + * "The 'identification' string is used to identify the + * situation and/or device where this adjustment should apply. + * The following is then repeated for every channel + * + * Type of channel $xx + * Volume adjustment $xx xx + * Bits representing peak $xx + * Peak volume $xx (xx ...)" + */ + + while (length >= 4) { + unsigned int peak_bytes; + + peak_bytes = (data[3] + 7) / 8; + if (4 + peak_bytes > length) + break; + + if (data[0] == CHANNEL_MASTER_VOLUME) { + signed int voladj_fixed; + double voladj_float; + + /* + * "The volume adjustment is encoded as a fixed + * point decibel value, 16 bit signed integer + * representing (adjustment*512), giving +/- 64 + * dB with a precision of 0.001953125 dB." + */ + + voladj_fixed = (data[1] << 8) | (data[2] << 0); + voladj_fixed |= -(voladj_fixed & 0x8000); + + voladj_float = (double) voladj_fixed / 512; + + replay_gain_info->tuples[REPLAY_GAIN_TRACK].gain = voladj_float; + replay_gain_info->tuples[REPLAY_GAIN_ALBUM].gain = voladj_float; + + g_debug("parseRVA2: Relative Volume " + "%+.1f dB adjustment (%s)\n", + voladj_float, id); + + return true; + } + + data += 4 + peak_bytes; + length -= 4 + peak_bytes; + } + + return false; +} diff --git a/src/tag_rva2.h b/src/tag_rva2.h new file mode 100644 index 000000000..a92c97912 --- /dev/null +++ b/src/tag_rva2.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2003-2010 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_TAG_RVA2_H +#define MPD_TAG_RVA2_H + +#include "check.h" + +#include <stdbool.h> + +struct id3_tag; +struct replay_gain_info; + +/** + * Parse the RVA2 tag, and fill the #replay_gain_info struct. This is + * used by decoder plugins with ID3 support. + * + * @return true on success + */ +bool +tag_rva2_parse(struct id3_tag *tag, struct replay_gain_info *replay_gain_info); + +#endif |