ref: 1c6affdddcbb9f09b97bdc9081281af7d6771421
dir: /src/i_musicpack.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
// DESCRIPTION:
// System interface for music.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "SDL.h"
#include "SDL_mixer.h"
#include "i_glob.h"
#include "i_midipipe.h"
#include "config.h"
#include "doomtype.h"
#include "memio.h"
#include "mus2mid.h"
#include "deh_str.h"
#include "gusconf.h"
#include "i_sound.h"
#include "i_system.h"
#include "i_swap.h"
#include "m_argv.h"
#include "m_config.h"
#include "m_misc.h"
#include "sha1.h"
#include "w_wad.h"
#include "z_zone.h"
#define MID_HEADER_MAGIC "MThd"
#define MUS_HEADER_MAGIC "MUS\x1a"
#define FLAC_HEADER "fLaC"
#define OGG_HEADER "OggS"
// Looping Vorbis metadata tag names. These have been defined by ZDoom
// for specifying the start and end positions for looping music tracks
// in .ogg and .flac files.
// More information is here: http://zdoom.org/wiki/Audio_loop
#define LOOP_START_TAG "LOOP_START"
#define LOOP_END_TAG "LOOP_END"
// FLAC metadata headers that we care about.
#define FLAC_STREAMINFO 0
#define FLAC_VORBIS_COMMENT 4
// Ogg metadata headers that we care about.
#define OGG_ID_HEADER 1
#define OGG_COMMENT_HEADER 3
// Structure for music substitution.
// We store a mapping based on SHA1 checksum -> filename of substitute music
// file to play, so that substitution occurs based on content rather than
// lump name. This has some inherent advantages:
// * Music for Plutonia (reused from Doom 1) works automatically.
// * If a PWAD replaces music, the replacement music is used rather than
// the substitute music for the IWAD.
// * If a PWAD reuses music from an IWAD (even from a different game), we get
// the high quality version of the music automatically (neat!)
typedef struct
{
const char *hash_prefix;
const char *filename;
} subst_music_t;
// Structure containing parsed metadata read from a digital music track:
typedef struct
{
boolean valid;
unsigned int samplerate_hz;
int start_time, end_time;
} file_metadata_t;
static subst_music_t *subst_music = NULL;
static unsigned int subst_music_len = 0;
static boolean music_initialized = false;
// If this is true, this module initialized SDL sound and has the
// responsibility to shut it down
static boolean sdl_was_initialized = false;
char *music_pack_path = "";
// If true, we are playing a substitute digital track rather than in-WAD
// MIDI/MUS track, and file_metadata contains loop metadata.
static file_metadata_t file_metadata;
// Position (in samples) that we have reached in the current track.
// This is updated by the TrackPositionCallback function.
static unsigned int current_track_pos;
// Currently playing music track.
static Mix_Music *current_track_music = NULL;
// If true, the currently playing track is being played on loop.
static boolean current_track_loop;
// Table of known hashes and filenames to look up for them. This allows
// users to drop in a set of files without having to also provide a
// configuration file.
static const subst_music_t known_filenames[] = {
// Doom 1 music files.
{"b2e05b4e8dff8d76f8f4", "d_inter.{ext}"},
{"0c0acce45130bab935d2", "d_intro.{ext}"},
{"fca4086939a68ae4ed84", "d_victor.{ext}"},
{"5971e5e20554f47ca065", "d_intro.{ext}"},
{"99767e32769229897f77", "d_e1m1.{ext}"},
{"b5e7dfb4efe9e688bf2a", "d_e1m2.{ext}"},
{"fda8fa73e4d30a6b961c", "d_e1m3.{ext}"},
{"3805f9bf3f1702f7e7f5", "d_e1m4.{ext}"},
{"f546ed823b234fe39165", "d_e1m5.{ext}"},
{"4450811b5a6748cfd83e", "d_e1m6.{ext}"},
{"73edb50d96b0ac03be34", "d_e1m7.{ext}"},
{"47d711a6fd32f5047879", "d_e1m8.{ext}"},
{"62c631c2fdaa5ecd9a8d", "d_e1m9.{ext}"},
{"7702a6449585428e7185", "d_e2m1.{ext}"},
{"1cb1810989cbfae2b29b", "d_e2m2.{ext}"},
{"7d740f3c881a22945e47", "d_e2m4.{ext}"},
{"ae9c3dc2f9aeea002327", "d_e2m6.{ext}"},
{"b26aad3caa420e9a2c76", "d_e2m7.{ext}"},
{"90f06251a2a90bfaefd4", "d_e2m8.{ext}"},
{"b2fb439f23c08c8e2577", "d_e3m1.{ext}"},
{"b6c07bb249526b864208", "d_e3m2.{ext}"},
{"ce3587ee503ffe707b2d", "d_e3m3.{ext}"},
{"d746ea2aa16b3237422c", "d_e3m8.{ext}"},
{"3da3b1335560a92912e6", "d_bunny.{ext}"},
// Duplicates that don't have identical hashes:
{"4a5badc4f10a7d4ed021", "d_inter.{ext}"}, // E2M3
{"36b14bf165b3fdd3958e", "d_e1m7.{ext}"}, // E3M5
{"e77c3d42f2ea87f04607", "d_e1m6.{ext}"}, // E3M6
{"3d85ec9c10b5ea465568", "d_e2m7.{ext}"}, // E3M7
{"4d42e2ce1c1ff192500e", "d_e1m9.{ext}"}, // E3M9
// These tracks are reused in Alien Vendetta, but are MIDs:
{"a05e45f67e1b64733fe3", "d_e2m1.{ext}"}, // MAP02
{"8024ae1616ddd97ce330", "d_e1m4.{ext}"}, // MAP03
{"3af8d79ddba49edaf9eb", "d_victor.{ext}"}, // MAP05
{"a55352c96c025b6bd08a", "d_inter.{ext}"}, // MAP07
{"76d1fc25ab7b1b4a58d6", "d_e1m8.{ext}"}, // MAP11
{"497777f0863eca7cea87", "d_e1m2.{ext}"}, // MAP12
{"0228fd87f8762f112fb6", "d_e2m2.{ext}"}, // MAP13
{"db94e8e1d7c02092eab5", "d_e1m6.{ext}"}, // MAP14
{"5a8d7a307eebc952795c", "d_e2m7.{ext}"}, // MAP16
{"1a36b692bf26d94a72cc", "d_e1m7.{ext}"}, // MAP23
{"37c6cefa351b06995152", "d_e1m5.{ext}"}, // MAP27
{"36b97b87fe98348d44b6", "d_e2m6.{ext}"}, // MAP28
// Doom II music files.
{"79080e9681a2d7bec3fb", "d_runnin.{ext}"}, // MAP01,15
{"868b3aae73c7b12e92c0", "d_stalks.{ext}"}, // MAP02,11,17
{"19237754d2eb85f41d84", "d_countd.{ext}"}, // MAP03,21
{"00abff3b61b25a6855d2", "d_betwee.{ext}"}, // MAP04
{"954636c7ee09edf5d98f", "d_doom.{ext}"}, // MAP05,13
{"8d32b2b7aa3b806474c1", "d_the_da.{ext}"}, // MAP06,12,24
{"41efc3c84bb321af2b6b", "d_shawn.{ext}"}, // MAP07,19,29
// Assuming single D_DDTBLU: http://doomwiki.org/wiki/Doom_II_music#Trivia
{"51c0872fec9f43259318", "d_ddtblu.{ext}"}, // MAP08
{"acb7ad85494d18235df8", "d_ddtblu.{ext}"}, // MAP14,22
{"4b7ceccbf47e78e2fa0b", "d_in_cit.{ext}"}, // MAP09
{"1d1f4a9edba174584e11", "d_dead.{ext}"}, // MAP10,16
{"1736c81aac77f9bffd3d", "d_romero.{ext}"}, // MAP18,27
{"a55d400570ad255a576b", "d_messag.{ext}"}, // MAP20,26
{"29d30c3fbd712016f2e5", "d_ampie.{ext}"}, // MAP23
{"bcfe9786afdcfb704afa", "d_adrian.{ext}"}, // MAP25
{"e05c10389e71836834ae", "d_tense.{ext}"}, // MAP28
{"b779022b1d0f0010b8f0", "d_openin.{ext}"}, // MAP30
{"a9a5f7b0ab3be0f4fc24", "d_evil.{ext}"}, // MAP31
{"4503d155aafec0296689", "d_ultima.{ext}"}, // MAP32
{"56f2363f01df38908c77", "d_dm2ttl.{ext}"},
{"71e58baf9e9dea4dd24a", "d_dm2int.{ext}"},
{"e632318629869811f7dc", "d_read_m.{ext}"},
// Duplicate filenames: the above filenames are the "canonical" files
// for the given SHA1 hashes, but we can also look for these filenames
// corresponding to the duplicated music tracks too.
{"868b3aae73c7b12e92c0", "d_stlks2.{ext}"},
{"868b3aae73c7b12e92c0", "d_stlks3.{ext}"},
{"8d32b2b7aa3b806474c1", "d_theda2.{ext}"},
{"8d32b2b7aa3b806474c1", "d_theda3.{ext}"},
{"954636c7ee09edf5d98f", "d_doom2.{ext}"},
{"acb7ad85494d18235df8", "d_ddtbl2.{ext}"},
{"acb7ad85494d18235df8", "d_ddtbl3.{ext}"},
{"79080e9681a2d7bec3fb", "d_runni2.{ext}"},
{"1d1f4a9edba174584e11", "d_dead2.{ext}"},
{"41efc3c84bb321af2b6b", "d_shawn2.{ext}"},
{"41efc3c84bb321af2b6b", "d_shawn3.{ext}"},
{"19237754d2eb85f41d84", "d_count2.{ext}"},
{"a55d400570ad255a576b", "d_messg2.{ext}"},
{"1736c81aac77f9bffd3d", "d_romer2.{ext}"},
// These tracks are reused in Alien Vendetta, but are MIDs:
{"9433604c098b7b1119a4", "d_in_cit.{ext}"}, // MAP26
// Heretic tracks.
{"12818ca0d3c957e7d57e", "mus_titl.{ext}"},
{"5cb988538ce1b1857349", "mus_intr.{ext}"},
{"6f126abe35a78b61b930", "mus_cptd.{ext}"},
{"62557250f0427c067dc9", "mus_e1m1.{ext}"},
{"1e8d5fd814490b9ae166", "mus_e1m2.{ext}"},
{"f0f31e8834e85035d434", "mus_e1m3.{ext}"},
{"054d6997405cc5a32b46", "mus_e1m4.{ext}"},
{"31950ab062cc1e5ca49d", "mus_e1m5.{ext}"},
{"7389024fbab0dff47211", "mus_e1m6.{ext}"},
{"f2aa312dddd0a294a095", "mus_e1m7.{ext}"},
{"cd6856731d1ae1f3aa4e", "mus_e1m8.{ext}"},
{"d7fe793f266733d92e61", "mus_e1m9.{ext}"},
{"933545b48fad8c66f042", "mus_e2m1.{ext}"},
{"bf88ecd4ae1621222592", "mus_e2m2.{ext}"},
{"4f619f87a828c2ca4801", "mus_e2m3.{ext}"},
{"13033a83c49424b2f2ab", "mus_e2m4.{ext}"},
{"b3851f9351ae411d9de3", "mus_e2m6.{ext}"},
{"82539791159fbbc02a23", "mus_e2m7.{ext}"},
{"fd9e53a49cfa62c463a0", "mus_e2m8.{ext}"},
{"29503959324d2ca67958", "mus_e2m9.{ext}"},
{"3aa632257c5be375b97b", "mus_e3m2.{ext}"},
{"69ba0dce7913d53b67a8", "mus_e3m3.{ext}"},
// These Heretic tracks are reused in Alien Vendetta, but are MIDs:
{"51344131e8d260753ce7", "mus_e2m3.{ext}"}, // MAP15
{"78b570b2397570440aff", "mus_e1m1.{ext}"}, // MAP19
{"ee21ba9fad4de3dfaef0", "mus_e1m4.{ext}"}, // MAP29
{"d2bb643a60696ccbca03", "mus_e1m9.{ext}"}, // MAP32
// Hexen tracks:
{"fbf55fc1ee26bd01266b", "winnowr.{ext}"},
{"71776e2da2b7ba607d81", "jachr.{ext}"},
{"c5c8630608b8132b33cd", "simonr.{ext}"},
{"43683b3f55a031de88d4", "wutzitr.{ext}"},
{"a6062883f29436ef73db", "falconr.{ext}"},
{"512cb6cc9b558d5f0fef", "levelr.{ext}"},
{"d31226ae75fce6a24208", "chartr.{ext}"},
{"bf1f1e561bbdba4e699f", "swampr.{ext}"},
{"b303193f756ca0e2de0f", "deepr.{ext}"},
{"f0635f0386d883b00186", "fubasr.{ext}"},
{"18f2a01f83df6e3abedc", "grover.{ext}"},
{"b2527eb0522f08b2cf5f", "fortr.{ext}"},
{"343addba8ba53a20a160", "foojar.{ext}"},
{"c13109045b06b5a63386", "sixater.{ext}"},
{"693525aaf69eac5429ab", "wobabyr.{ext}"},
{"8f884223811c2bb8311d", "cryptr.{ext}"},
{"de540e6826e62b32c01c", "fantar.{ext}"},
{"efdff548df918934f71f", "blechr.{ext}"},
{"de91f150f6a127e72e35", "voidr.{ext}"},
{"e0497fe27289fe18515b", "chap_1r.{ext}"},
{"f2ef1abdc3f672a3519a", "chap_2r.{ext}"},
{"78cd9882f61cc441bef4", "chap_3r.{ext}"},
{"97b2b575d9d096c1f89f", "chap_4r.{ext}"},
{"ad0197a0f6c52ac30915", "chippyr.{ext}"},
{"30506c62e9f0989ffe09", "percr.{ext}"},
{"3542803beaa43bf1de1a", "secretr.{ext}"},
{"81067721f40c611d09fb", "bonesr.{ext}"},
{"4822af2e1a2eb7faf660", "octor.{ext}"},
{"26bb3cec902ed8008fc2", "rithmr.{ext}"},
{"94ab641c7aa93caac77a", "stalkr.{ext}"},
{"d0a3f337c54b0703b4d3", "borkr.{ext}"},
{"79e7781ec7eb9b9434b5", "crucibr.{ext}"},
{"c2786e5581a7f8801969", "hexen.{ext}"},
{"97fae9a084c0efda5151", "hub.{ext}"},
{"c5da52d5c2ec4803ef8f", "hall.{ext}"},
{"1e71bc0e2feafb06214e", "orb.{ext}"},
{"bc9dcfa6632e847e03af", "chess.{ext}"},
// Hexen CD tracks: alternate filenames for a ripped copy of
// the CD soundtrack.
{"71776e2da2b7ba607d81", "hexen02.{ext}"}, // level 2 (jachr)
{"efdff548df918934f71f", "hexen03.{ext}"}, // level 26 (blechr)
{"c2786e5581a7f8801969", "hexen04.{ext}"}, // (hexen)
{"1e71bc0e2feafb06214e", "hexen05.{ext}"}, // (orb)
{"f0635f0386d883b00186", "hexen06.{ext}"}, // level 10 (fubasr)
{"bc9dcfa6632e847e03af", "hexen07.{ext}"}, // (chess)
{"8f884223811c2bb8311d", "hexen08.{ext}"}, // level 24 (cryptr)
{"a6062883f29436ef73db", "hexen09.{ext}"}, // level 5 (falconr)
{"4822af2e1a2eb7faf660", "hexen10.{ext}"}, // level 36 (octor)
{"26bb3cec902ed8008fc2", "hexen11.{ext}"}, // level 37 (rithmr)
{"c13109045b06b5a63386", "hexen12.{ext}"}, // level 22 (sixater)
{"fbf55fc1ee26bd01266b", "hexen13.{ext}"}, // level 1 (winnowr)
{"bf1f1e561bbdba4e699f", "hexen14.{ext}"}, // level 8 (swampr)
{"43683b3f55a031de88d4", "hexen15.{ext}"}, // level 4 (wutzitr)
{"81067721f40c611d09fb", "hexen16.{ext}"}, // level 35 (bonesr)
{"e0497fe27289fe18515b", "hexen17.{ext}"}, // level 28 (chap_1r)
{"97b2b575d9d096c1f89f", "hexen18.{ext}"}, // level 31 (chap_4r)
{"de540e6826e62b32c01c", "hexen19.{ext}"}, // level 25 (fantar)
{"343addba8ba53a20a160", "hexen20.{ext}"}, // level 21 (foojar)
{"512cb6cc9b558d5f0fef", "hexen21.{ext}"}, // level 6 (levelr)
{"c5c8630608b8132b33cd", "hexen22.{ext}"}, // level 3 (simonr)
// Strife:
{"8ac2b2b47707f0fdf8f6", "d_logo.{ext}"}, // Title
{"62e1c58054a1f1bc39b2", "d_action.{ext}"}, // 1,15,28
{"12fa000f3fa1edac5c4f", "d_tavern.{ext}"}, // 2
{"695e56ab3251792d20e5", "d_danger.{ext}"}, // 3,11
{"96fe30e8712217b60dd7", "d_fast.{ext}"}, // 4
{"61345598a3de04aad508", "d_darker.{ext}"}, // 6,14
{"52353e9a435b7b1cb268", "d_strike.{ext}"}, // 7,19
{"061164504907bffc9c22", "d_slide.{ext}"}, // 8,18,22
{"3dbb4b703ce69aafcdd5", "d_tribal.{ext}"}, // 9
{"393773688eba050c3548", "d_march.{ext}"}, // 10
{"3cba3c627de065a667dd", "d_mood.{ext}"}, // 12
{"b1f65a333e5c70255784", "d_castle.{ext}"}, // 13
{"e1455a83a04c9ac4a09f", "d_fight.{ext}"}, // 16,31
{"17f822b7374b1f069b89", "d_spense.{ext}"}, // 17
{"e66c5a1a7d05f021f4ae", "d_dark.{ext}"}, // 20
{"1c92bd0625026af30dad", "d_tech.{ext}"}, // 21,27
{"7ae280713d078de7933a", "d_drone.{ext}"}, // 23,30
{"4a664afd0d7eae79c97a", "d_panthr.{ext}"}, // 24
{"4a7d62beeac5601ccf21", "d_sad.{ext}"}, // 25
{"e60e109779400f2855d7", "d_instry.{ext}"}, // 26,29
{"b7d36878faeb291d6df5", "d_happy.{ext}"}, // Better ending
{"ff4a342c8c5ec51b06c3", "d_end.{ext}"}, // Worse ending
// This conflicts with Doom's d_intro:
//{"ec8fa484c4e85adbf700", "d_intro.{ext}"}, // 5
};
// Given a time string (for LOOP_START/LOOP_END), parse it and return
// the time (in # samples since start of track) it represents.
static unsigned int ParseVorbisTime(unsigned int samplerate_hz, char *value)
{
char *num_start, *p;
unsigned int result = 0;
char c;
if (strchr(value, ':') == NULL)
{
return atoi(value);
}
result = 0;
num_start = value;
for (p = value; *p != '\0'; ++p)
{
if (*p == '.' || *p == ':')
{
c = *p; *p = '\0';
result = result * 60 + atoi(num_start);
num_start = p + 1;
*p = c;
}
if (*p == '.')
{
return result * samplerate_hz
+ (unsigned int) (atof(p) * samplerate_hz);
}
}
return (result * 60 + atoi(num_start)) * samplerate_hz;
}
// Given a vorbis comment string (eg. "LOOP_START=12345"), set fields
// in the metadata structure as appropriate.
static void ParseVorbisComment(file_metadata_t *metadata, char *comment)
{
char *eq, *key, *value;
eq = strchr(comment, '=');
if (eq == NULL)
{
return;
}
key = comment;
*eq = '\0';
value = eq + 1;
if (!strcmp(key, LOOP_START_TAG))
{
metadata->start_time = ParseVorbisTime(metadata->samplerate_hz, value);
}
else if (!strcmp(key, LOOP_END_TAG))
{
metadata->end_time = ParseVorbisTime(metadata->samplerate_hz, value);
}
}
// Parse a vorbis comments structure, reading from the given file.
static void ParseVorbisComments(file_metadata_t *metadata, FILE *fs)
{
uint32_t buf;
unsigned int num_comments, i, comment_len;
char *comment;
// We must have read the sample rate already from an earlier header.
if (metadata->samplerate_hz == 0)
{
return;
}
// Skip the starting part we don't care about.
if (fread(&buf, 4, 1, fs) < 1)
{
return;
}
if (fseek(fs, LONG(buf), SEEK_CUR) != 0)
{
return;
}
// Read count field for number of comments.
if (fread(&buf, 4, 1, fs) < 1)
{
return;
}
num_comments = LONG(buf);
// Read each individual comment.
for (i = 0; i < num_comments; ++i)
{
// Read length of comment.
if (fread(&buf, 4, 1, fs) < 1)
{
return;
}
comment_len = LONG(buf);
// Read actual comment data into string buffer.
comment = calloc(1, comment_len + 1);
if (comment == NULL
|| fread(comment, 1, comment_len, fs) < comment_len)
{
free(comment);
break;
}
// Parse comment string.
ParseVorbisComment(metadata, comment);
free(comment);
}
}
static void ParseFlacStreaminfo(file_metadata_t *metadata, FILE *fs)
{
byte buf[34];
// Read block data.
if (fread(buf, sizeof(buf), 1, fs) < 1)
{
return;
}
// We only care about sample rate and song length.
metadata->samplerate_hz = (buf[10] << 12) | (buf[11] << 4)
| (buf[12] >> 4);
// Song length is actually a 36 bit field, but 32 bits should be
// enough for everybody.
//metadata->song_length = (buf[14] << 24) | (buf[15] << 16)
// | (buf[16] << 8) | buf[17];
}
static void ParseFlacFile(file_metadata_t *metadata, FILE *fs)
{
byte header[4];
unsigned int block_type;
size_t block_len;
boolean last_block;
for (;;)
{
long pos = -1;
// Read METADATA_BLOCK_HEADER:
if (fread(header, 4, 1, fs) < 1)
{
return;
}
block_type = header[0] & ~0x80;
last_block = (header[0] & 0x80) != 0;
block_len = (header[1] << 16) | (header[2] << 8) | header[3];
pos = ftell(fs);
if (pos < 0)
{
return;
}
if (block_type == FLAC_STREAMINFO)
{
ParseFlacStreaminfo(metadata, fs);
}
else if (block_type == FLAC_VORBIS_COMMENT)
{
ParseVorbisComments(metadata, fs);
}
if (last_block)
{
break;
}
// Seek to start of next block.
if (fseek(fs, pos + block_len, SEEK_SET) != 0)
{
return;
}
}
}
static void ParseOggIdHeader(file_metadata_t *metadata, FILE *fs)
{
byte buf[21];
if (fread(buf, sizeof(buf), 1, fs) < 1)
{
return;
}
metadata->samplerate_hz = (buf[8] << 24) | (buf[7] << 16)
| (buf[6] << 8) | buf[5];
}
static void ParseOggFile(file_metadata_t *metadata, FILE *fs)
{
byte buf[7];
unsigned int offset;
// Scan through the start of the file looking for headers. They
// begin '[byte]vorbis' where the byte value indicates header type.
memset(buf, 0, sizeof(buf));
for (offset = 0; offset < 100 * 1024; ++offset)
{
// buf[] is used as a sliding window. Each iteration, we
// move the buffer one byte to the left and read an extra
// byte onto the end.
memmove(buf, buf + 1, sizeof(buf) - 1);
if (fread(&buf[6], 1, 1, fs) < 1)
{
return;
}
if (!memcmp(buf + 1, "vorbis", 6))
{
switch (buf[0])
{
case OGG_ID_HEADER:
ParseOggIdHeader(metadata, fs);
break;
case OGG_COMMENT_HEADER:
ParseVorbisComments(metadata, fs);
break;
default:
break;
}
}
}
}
static void ReadLoopPoints(const char *filename, file_metadata_t *metadata)
{
FILE *fs;
char header[4];
metadata->valid = false;
metadata->samplerate_hz = 0;
metadata->start_time = 0;
metadata->end_time = -1;
fs = fopen(filename, "rb");
if (fs == NULL)
{
return;
}
// Check for a recognized file format; use the first four bytes
// of the file.
if (fread(header, 4, 1, fs) < 1)
{
fclose(fs);
return;
}
if (memcmp(header, FLAC_HEADER, 4) == 0)
{
ParseFlacFile(metadata, fs);
}
else if (memcmp(header, OGG_HEADER, 4) == 0)
{
ParseOggFile(metadata, fs);
}
fclose(fs);
// Only valid if at the very least we read the sample rate.
metadata->valid = metadata->samplerate_hz > 0;
// If start and end time are both zero, ignore the loop tags.
// This is consistent with other source ports.
if (metadata->start_time == 0 && metadata->end_time == 0)
{
metadata->valid = false;
}
}
// Given a MUS lump, look up a substitute MUS file to play instead
// (or NULL to just use normal MIDI playback).
static const char *GetSubstituteMusicFile(void *data, size_t data_len)
{
sha1_context_t context;
sha1_digest_t hash;
const char *filename;
char hash_str[sizeof(sha1_digest_t) * 2 + 1];
unsigned int i;
// Don't bother doing a hash if we're never going to find anything.
if (subst_music_len == 0)
{
return NULL;
}
SHA1_Init(&context);
SHA1_Update(&context, data, data_len);
SHA1_Final(hash, &context);
// Build a string representation of the hash.
for (i = 0; i < sizeof(sha1_digest_t); ++i)
{
M_snprintf(hash_str + i * 2, sizeof(hash_str) - i * 2,
"%02x", hash[i]);
}
// Look for a hash that matches.
// The substitute mapping list can (intentionally) contain multiple
// filename mappings for the same hash. This allows us to try
// different files and fall back if our first choice isn't found.
filename = NULL;
for (i = 0; i < subst_music_len; ++i)
{
if (M_StringStartsWith(hash_str, subst_music[i].hash_prefix))
{
filename = subst_music[i].filename;
// If the file exists, then use this file in preference to
// any fallbacks. But we always return a filename if it's
// in the list, even if it's just so we can print an error
// message to the user saying it doesn't exist.
if (M_FileExists(filename))
{
break;
}
}
}
return filename;
}
static char *GetFullPath(const char *musicdir, const char *path)
{
char *result;
char *systemized_path;
// Starting with directory separator means we have an absolute path,
// so just return it.
if (path[0] == DIR_SEPARATOR)
{
return M_StringDuplicate(path);
}
#ifdef _WIN32
// d:\path\...
if (isalpha(path[0]) && path[1] == ':' && path[2] == DIR_SEPARATOR)
{
return M_StringDuplicate(path);
}
#endif
// Paths in the substitute filenames can contain Unix-style /
// path separators, but we should convert this to the separator
// for the native platform.
systemized_path = M_StringReplace(path, "/", DIR_SEPARATOR_S);
// Copy config filename and cut off the filename to just get the
// parent dir.
result = M_StringJoin(musicdir, systemized_path, NULL);
free(systemized_path);
return result;
}
// If filename ends with .{ext}, check if a .ogg, .flac or .mp3 exists with
// that name, returning it if found. If none exist, NULL is returned. If the
// filename doesn't end with .{ext} then it just acts as a wrapper around
// GetFullPath().
static char *ExpandFileExtension(const char *musicdir, const char *filename)
{
static const char *extns[] = {".flac", ".ogg", ".mp3"};
char *replaced, *result;
int i;
if (!M_StringEndsWith(filename, ".{ext}"))
{
return GetFullPath(musicdir, filename);
}
for (i = 0; i < arrlen(extns); ++i)
{
replaced = M_StringReplace(filename, ".{ext}", extns[i]);
result = GetFullPath(musicdir, replaced);
free(replaced);
if (M_FileExists(result))
{
return result;
}
free(result);
}
return NULL;
}
// Add a substitute music file to the lookup list.
static void AddSubstituteMusic(const char *musicdir, const char *hash_prefix,
const char *filename)
{
subst_music_t *s;
char *path;
path = ExpandFileExtension(musicdir, filename);
if (path == NULL)
{
return;
}
++subst_music_len;
subst_music =
I_Realloc(subst_music, sizeof(subst_music_t) * subst_music_len);
s = &subst_music[subst_music_len - 1];
s->hash_prefix = hash_prefix;
s->filename = path;
}
static const char *ReadHashPrefix(char *line)
{
char *result;
char *p;
int i, len;
for (p = line; *p != '\0' && !isspace(*p) && *p != '='; ++p)
{
if (!isxdigit(*p))
{
return NULL;
}
}
len = p - line;
if (len == 0 || len > sizeof(sha1_digest_t) * 2)
{
return NULL;
}
result = malloc(len + 1);
if (result == NULL)
{
return NULL;
}
for (i = 0; i < len; ++i)
{
result[i] = tolower(line[i]);
}
result[len] = '\0';
return result;
}
// Parse a line from substitute music configuration file; returns error
// message or NULL for no error.
static const char *ParseSubstituteLine(char *musicdir, char *line)
{
const char *hash_prefix;
char *filename;
char *p;
// Strip out comments if present.
p = strchr(line, '#');
if (p != NULL)
{
while (p > line && isspace(*(p - 1)))
{
--p;
}
*p = '\0';
}
// Skip leading spaces.
for (p = line; *p != '\0' && isspace(*p); ++p);
// Empty line? This includes comment lines now that comments have
// been stripped.
if (*p == '\0')
{
return NULL;
}
hash_prefix = ReadHashPrefix(p);
if (hash_prefix == NULL)
{
return "Invalid hash prefix";
}
p += strlen(hash_prefix);
// Skip spaces.
for (; *p != '\0' && isspace(*p); ++p);
if (*p != '=')
{
return "Expected '='";
}
++p;
// Skip spaces.
for (; *p != '\0' && isspace(*p); ++p);
filename = p;
// We're now at the filename. Cut off trailing space characters.
while (strlen(p) > 0 && isspace(p[strlen(p) - 1]))
{
p[strlen(p) - 1] = '\0';
}
if (strlen(p) == 0)
{
return "No filename specified for music substitution";
}
// Expand full path and add to our database of substitutes.
AddSubstituteMusic(musicdir, hash_prefix, filename);
return NULL;
}
// Read a substitute music configuration file.
static boolean ReadSubstituteConfig(char *musicdir, const char *filename)
{
char *buffer;
char *line;
int linenum = 1;
// This unnecessarily opens the file twice...
if (!M_FileExists(filename))
{
return false;
}
M_ReadFile(filename, (byte **) &buffer);
line = buffer;
while (line != NULL)
{
const char *error;
char *next;
// find end of line
char *eol = strchr(line, '\n');
if (eol != NULL)
{
// change the newline into NUL
*eol = '\0';
next = eol + 1;
}
else
{
// end of buffer
next = NULL;
}
error = ParseSubstituteLine(musicdir, line);
if (error != NULL)
{
fprintf(stderr, "%s:%i: Error: %s\n", filename, linenum, error);
}
++linenum;
line = next;
}
Z_Free(buffer);
return true;
}
// Find substitute configs and try to load them.
static void LoadSubstituteConfigs(void)
{
glob_t *glob;
char *musicdir;
const char *path;
unsigned int old_music_len;
unsigned int i;
// We can configure the path to music packs using the music_pack_path
// configuration variable. Otherwise we use the current directory, or
// $configdir/music to look for .cfg files.
if (strcmp(music_pack_path, "") != 0)
{
musicdir = M_StringJoin(music_pack_path, DIR_SEPARATOR_S, NULL);
}
else if (!strcmp(configdir, ""))
{
musicdir = M_StringDuplicate("");
}
else
{
musicdir = M_StringJoin(configdir, "music", DIR_SEPARATOR_S, NULL);
}
// Load all music packs, by searching for .cfg files.
glob = I_StartGlob(musicdir, "*.cfg", GLOB_FLAG_SORTED|GLOB_FLAG_NOCASE);
for (;;)
{
path = I_NextGlob(glob);
if (path == NULL)
{
break;
}
ReadSubstituteConfig(musicdir, path);
}
I_EndGlob(glob);
if (subst_music_len > 0)
{
printf("Loaded %i music substitutions from config files.\n",
subst_music_len);
}
old_music_len = subst_music_len;
// Add entries from known filenames list. We add this after those from the
// configuration files, so that the entries here can be overridden.
for (i = 0; i < arrlen(known_filenames); ++i)
{
AddSubstituteMusic(musicdir, known_filenames[i].hash_prefix,
known_filenames[i].filename);
}
if (subst_music_len > old_music_len)
{
printf("Configured %i music substitutions based on filename.\n",
subst_music_len - old_music_len);
}
free(musicdir);
}
// Returns true if the given lump number is a music lump that should
// be included in substitute configs.
// Identifying music lumps by name is not feasible; some games (eg.
// Heretic, Hexen) don't have a common naming pattern for music lumps.
static boolean IsMusicLump(int lumpnum)
{
byte *data;
boolean result;
if (W_LumpLength(lumpnum) < 4)
{
return false;
}
data = W_CacheLumpNum(lumpnum, PU_STATIC);
result = memcmp(data, MUS_HEADER_MAGIC, 4) == 0
|| memcmp(data, MID_HEADER_MAGIC, 4) == 0;
W_ReleaseLumpNum(lumpnum);
return result;
}
// Dump an example config file containing checksums for all MIDI music
// found in the WAD directory.
static void DumpSubstituteConfig(char *filename)
{
sha1_context_t context;
sha1_digest_t digest;
char name[9];
byte *data;
FILE *fs;
unsigned int lumpnum;
size_t h;
fs = fopen(filename, "w");
if (fs == NULL)
{
I_Error("Failed to open %s for writing", filename);
return;
}
fprintf(fs, "# Example %s substitute MIDI file.\n\n", PACKAGE_NAME);
fprintf(fs, "# SHA1 hash = filename\n");
for (lumpnum = 0; lumpnum < numlumps; ++lumpnum)
{
strncpy(name, lumpinfo[lumpnum]->name, 8);
name[8] = '\0';
if (!IsMusicLump(lumpnum))
{
continue;
}
// Calculate hash.
data = W_CacheLumpNum(lumpnum, PU_STATIC);
SHA1_Init(&context);
SHA1_Update(&context, data, W_LumpLength(lumpnum));
SHA1_Final(digest, &context);
W_ReleaseLumpNum(lumpnum);
// Print line.
for (h = 0; h < sizeof(sha1_digest_t); ++h)
{
fprintf(fs, "%02x", digest[h]);
}
fprintf(fs, " = %s.ogg\n", name);
}
fprintf(fs, "\n");
fclose(fs);
printf("Substitute MIDI config file written to %s.\n", filename);
I_Quit();
}
// Shutdown music
static void I_MP_ShutdownMusic(void)
{
if (music_initialized)
{
Mix_HaltMusic();
music_initialized = false;
if (sdl_was_initialized)
{
Mix_CloseAudio();
SDL_QuitSubSystem(SDL_INIT_AUDIO);
sdl_was_initialized = false;
}
}
}
static boolean SDLIsInitialized(void)
{
int freq, channels;
Uint16 format;
return Mix_QuerySpec(&freq, &format, &channels) != 0;
}
// Callback function that is invoked to track current track position.
void TrackPositionCallback(int chan, void *stream, int len, void *udata)
{
// Position is doubled up twice: for 16-bit samples and for stereo.
current_track_pos += len / 4;
}
// Initialize music subsystem
static boolean I_MP_InitMusic(void)
{
int i;
//!
// @category obscure
// @arg <filename>
//
// Read all MIDI files from loaded WAD files, dump an example substitution
// music config file to the specified filename and quit.
//
i = M_CheckParmWithArgs("-dumpsubstconfig", 1);
if (i > 0)
{
DumpSubstituteConfig(myargv[i + 1]);
}
// If we're in GENMIDI mode, try to load sound packs.
LoadSubstituteConfigs();
// We can't initialize if we don't have any substitute files to work with.
// If so, don't bother with SDL initialization etc.
if (subst_music_len == 0)
{
return false;
}
// If SDL_mixer is not initialized, we have to initialize it
// and have the responsibility to shut it down later on.
if (SDLIsInitialized())
{
music_initialized = true;
}
else if (SDL_Init(SDL_INIT_AUDIO) < 0)
{
fprintf(stderr, "Unable to set up sound.\n");
}
else if (Mix_OpenAudio(snd_samplerate, AUDIO_S16SYS, 2, 1024) < 0)
{
fprintf(stderr, "Error initializing SDL_mixer: %s\n",
Mix_GetError());
SDL_QuitSubSystem(SDL_INIT_AUDIO);
}
else
{
SDL_PauseAudio(0);
sdl_was_initialized = true;
music_initialized = true;
}
// Initialize SDL_Mixer for digital music playback
Mix_Init(MIX_INIT_FLAC | MIX_INIT_OGG | MIX_INIT_MP3);
// Register an effect function to track the music position.
Mix_RegisterEffect(MIX_CHANNEL_POST, TrackPositionCallback, NULL, NULL);
return music_initialized;
}
// Set music volume (0 - 127)
static void I_MP_SetMusicVolume(int volume)
{
Mix_VolumeMusic((volume * MIX_MAX_VOLUME) / 127);
}
// Start playing a mid
static void I_MP_PlaySong(void *handle, boolean looping)
{
int loops;
if (!music_initialized)
{
return;
}
if (handle == NULL)
{
return;
}
current_track_music = (Mix_Music *) handle;
current_track_loop = looping;
if (looping)
{
loops = -1;
}
else
{
loops = 1;
}
// Don't loop when playing substitute music, as we do it
// ourselves instead.
if (file_metadata.valid)
{
loops = 1;
SDL_LockAudio();
current_track_pos = 0; // start of track
SDL_UnlockAudio();
}
if (Mix_PlayMusic(current_track_music, loops) == -1)
{
fprintf(stderr, "I_MP_PlaySong: Error starting track: %s\n",
Mix_GetError());
}
}
static void I_MP_PauseSong(void)
{
if (!music_initialized)
{
return;
}
Mix_PauseMusic();
}
static void I_MP_ResumeSong(void)
{
if (!music_initialized)
{
return;
}
Mix_ResumeMusic();
}
static void I_MP_StopSong(void)
{
if (!music_initialized)
{
return;
}
Mix_HaltMusic();
current_track_music = NULL;
}
static void I_MP_UnRegisterSong(void *handle)
{
Mix_Music *music = (Mix_Music *) handle;
if (!music_initialized)
{
return;
}
if (handle == NULL)
{
return;
}
Mix_FreeMusic(music);
}
static void *I_MP_RegisterSong(void *data, int len)
{
const char *filename;
Mix_Music *music;
if (!music_initialized)
{
return NULL;
}
// See if we're substituting this MUS for a high-quality replacement.
filename = GetSubstituteMusicFile(data, len);
if (filename == NULL)
{
return NULL;
}
music = Mix_LoadMUS(filename);
if (music == NULL)
{
// Fall through and play MIDI normally, but print an error
// message.
fprintf(stderr, "Failed to load substitute music file: %s: %s\n",
filename, Mix_GetError());
return NULL;
}
// Read loop point metadata from the file so that we know where
// to loop the music.
ReadLoopPoints(filename, &file_metadata);
return music;
}
// Is the song playing?
static boolean I_MP_MusicIsPlaying(void)
{
if (!music_initialized)
{
return false;
}
return Mix_PlayingMusic();
}
// Get position in substitute music track, in seconds since start of track.
static double GetMusicPosition(void)
{
unsigned int music_pos;
int freq;
Mix_QuerySpec(&freq, NULL, NULL);
SDL_LockAudio();
music_pos = current_track_pos;
SDL_UnlockAudio();
return (double) music_pos / freq;
}
static void RestartCurrentTrack(void)
{
double start = (double) file_metadata.start_time
/ file_metadata.samplerate_hz;
// If the track finished we need to restart it.
if (current_track_music != NULL)
{
Mix_PlayMusic(current_track_music, 1);
}
Mix_SetMusicPosition(start);
SDL_LockAudio();
current_track_pos = file_metadata.start_time;
SDL_UnlockAudio();
}
// Poll music position; if we have passed the loop point end position
// then we need to go back.
static void I_MP_PollMusic(void)
{
// When playing substitute tracks, loop tags only apply if we're playing
// a looping track. Tracks like the title screen music have the loop
// tags ignored.
if (current_track_loop && file_metadata.valid)
{
double end = (double) file_metadata.end_time
/ file_metadata.samplerate_hz;
// If we have reached the loop end point then we have to take action.
if (file_metadata.end_time >= 0 && GetMusicPosition() >= end)
{
RestartCurrentTrack();
}
// Have we reached the actual end of track (not loop end)?
if (!Mix_PlayingMusic())
{
RestartCurrentTrack();
}
}
}
music_module_t music_pack_module =
{
NULL,
0,
I_MP_InitMusic,
I_MP_ShutdownMusic,
I_MP_SetMusicVolume,
I_MP_PauseSong,
I_MP_ResumeSong,
I_MP_RegisterSong,
I_MP_UnRegisterSong,
I_MP_PlaySong,
I_MP_StopSong,
I_MP_MusicIsPlaying,
I_MP_PollMusic,
};