rough implementation (haven't even compile it yet)
This commit is contained in:
Josh Coalson
parent
456db820b6
commit
6213a31f7b
@ -1,4 +1,3 @@
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/* in_flac - Winamp3 FLAC input plugin
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* Copyright (C) 2001 Josh Coalson
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*
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* This program is free software; you can redistribute it and/or
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@ -19,6 +18,36 @@
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#include <windows.h>
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#include <stdio.h>
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#include "core_api.h"
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#include "FLAC/all.h"
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typedef struct {
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byte raw[128];
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char title[31];
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char artist[31];
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char album[31];
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char comment[31];
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unsigned year;
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unsigned track; /* may be 0 if v1 (not v1.1) tag */
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unsigned genre;
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char description[1024]; /* the formatted description passed to xmms */
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} id3v1_struct;
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typedef struct {
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bool abort_flag;
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bool is_playing;
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bool eof;
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unsigned total_samples;
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unsigned bits_per_sample;
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unsigned channels;
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unsigned sample_rate;
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unsigned length_in_msec;
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} file_info_struct;
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static bool get_id3v1_tag_(const char *filename, id3v1_struct *tag);
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static bool decoder_init_(const char *filename);
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static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data);
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static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
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static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
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static char plugin_description_[] = "Reference FLAC Player v" FLAC__VERSION_STRING;
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static HINSTANCE g_hDllInstance_;
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@ -26,21 +55,20 @@ static HINSTANCE g_hDllInstance_;
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class FLAC_Info : public WInputInfo
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{
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private:
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char title[MAX_PATH], infostr[MAX_PATH];
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int length_in_ms;
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id3v1_struct tag_;
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int length_in_msec_;
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public:
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FLAC_Info();
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~FLAC_Info();
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int Open(char *url);
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void GetTitle(char *buf, int maxlen);
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void GetInfoString(char *buf, int maxlen);
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inline int GetLength(void) { return length_in_ms; }
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inline int GetLength(void) { return length_in_msec_; }
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};
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FLAC_Info::FLAC_Info() : WInputInfo()
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{
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infostr[0] = title[0] = 0;
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length_in_ms = -1;
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length_in_msec_ = -1;
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}
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FLAC_Info::~FLAC_Info()
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@ -49,39 +77,58 @@ FLAC_Info::~FLAC_Info()
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int FLAC_Info::Open(char *url)
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{
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char *p=url+strlen(url);
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while (*p != '\\' && p >= url) p--;
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strcpy(title, ++p);
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const char *filename = url; /* @@@ right now we only handle files */
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HANDLE hFile;
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length_in_ms = -1;
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hFile = CreateFile(url, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (hFile != INVALID_HANDLE_VALUE) {
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length_in_ms = (GetFileSize(hFile, NULL)*10)/(SAMPLERATE/100*NCH*(BPS/8));
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(void)get_id3v1_tag_(filename, &tag_);
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file_info_struct tmp_file_info;
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FLAC__FileDecoder *tmp_decoder = FLAC__file_decoder_get_new_instance();
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if(0 == tmp_decoder) {
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length_in_msec_ = -1;
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return 1;
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}
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CloseHandle(hFile);
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tmp_file_info.abort_flag = false;
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tmp_decoder->check_md5 = false; /* turn off MD5 checking in the decoder */
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if(FLAC__file_decoder_init(tmp_decoder, filename, write_callback_, metadata_callback_, error_callback_, &tmp_file_info) != FLAC__FILE_DECODER_OK) {
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length_in_msec_ = -1;
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return 1;
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}
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if(!FLAC__file_decoder_process_metadata(tmp_decoder)) {
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length_in_msec_ = -1;
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return 1;
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}
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length_in_msec_ = (int)tmp_file_info.length_in_msec;
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if(tmp_decoder->state != FLAC__FILE_DECODER_UNINITIALIZED)
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FLAC__file_decoder_finish(tmp_decoder);
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FLAC__file_decoder_free_instance(tmp_decoder);
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return 0;
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}
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void FLAC_Info::GetTitle(char *buf, int maxlen)
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{
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strncpy(buf, title, maxlen-1);
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buf[maxlen-1]=0;
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buf[maxlen-1] = 0;
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}
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void FLAC_Info::GetInfoString(char *buf, int maxlen)
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{
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strncpy(buf, infostr, maxlen-1);
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buf[maxlen-1]=0;
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strncpy(buf, description, maxlen-1);
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buf[maxlen-1] = 0;
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}
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class FLAC_Source : public WInputSource
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{
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private:
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char title[MAX_PATH], infostr[MAX_PATH];
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int length_in_ms;
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HANDLE input_file;
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id3v1_struct tag_;
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FLAC__FileDecoder *decoder_;
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int16 reservoir_[FLAC__MAX_BLOCK_SIZE * 2 * 2]; /* *2 for max channels, another *2 for overflow */
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unsigned reservoir_samples_;
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file_info_struct file_info_;
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bool audio_error_;
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public:
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FLAC_Source();
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~FLAC_Source();
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@ -92,9 +139,23 @@ class FLAC_Source : public WInputSource
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int SetPosition(int); // sets position in ms
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void GetTitle(char *buf, int maxlen);
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void GetInfoString(char *buf, int maxlen);
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inline int GetLength(void) { return -1; }
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inline int GetLength(void) { return (int)file_info_.length_in_msec; }
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void cleanup();
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};
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FLAC_Source::FLAC_Source() : WInputSource()
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{
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decoder_ = FLAC__file_decoder_get_new_instance();
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file_info_.length_in_msec = -1;
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audio_error_ = false;
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}
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FLAC_Source::~FLAC_Source()
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{
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if(decoder_)
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FLAC__file_decoder_free_instance(decoder_);
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}
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void FLAC_Source::GetTitle(char *buf, int maxlen)
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{
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strncpy(buf, title, maxlen-1);
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@ -103,52 +164,106 @@ void FLAC_Source::GetTitle(char *buf, int maxlen)
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void FLAC_Source::GetInfoString(char *buf, int maxlen)
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{
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strncpy(buf, infostr, maxlen-1);
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strncpy(buf, description, maxlen-1);
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buf[maxlen-1] = 0;
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}
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FLAC_Source::FLAC_Source() : WInputSource()
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{
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infostr[0] = title[0] = 0;
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length_in_ms = -1;
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input_file = NULL;
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}
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FLAC_Source::~FLAC_Source()
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{
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if(input_file)
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CloseHandle(input_file);
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}
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int FLAC_Source::Open(char *url, bool *killswitch)
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{
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char *p = url+strlen(url);
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while (*p != '\\' && p >= url) p--;
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strcpy(title, ++p);
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const char *filename = url; /* @@@ right now we only handle files */
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length_in_ms = -1;
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input_file = CreateFile(url, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (input_file == INVALID_HANDLE_VALUE) return 1;
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{
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FILE *f = fopen(filename, "r");
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if(0 == f)
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return 1;
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fclose(f);
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}
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(void)get_id3v1_tag_(filename, &tag);
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file_info_.length_in_msec = -1;
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if(!decoder_init_(filename))
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return 1;
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if(file_info_.abort_flag) {
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cleanup();
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return 1;
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}
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reservoir_samples_ = 0;
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audio_error_ = false;
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file_info_.is_playing = true;
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file_info_.eof = false;
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length_in_ms = (GetFileSize(input_file, NULL)*10)/(SAMPLERATE/100*NCH*(BPS/8));
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return 0;
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}
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int FLAC_Source::GetSamples(char *sample_buffer, int bytes, int *bps, int *nch, int *srate, bool *killswitch)
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{
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*srate = SAMPLERATE;
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*bps = BPS;
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*nch = NCH;
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int return_bytes = 0;
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unsigned long l;
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ReadFile(input_file, sample_buffer, bytes, &l, NULL);
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*bps = (int)file_info_.bits_per_sample;
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*nch = (int)file_info_.channels;
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*srate = (int)file_info_.sample_rate;
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return l;
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if(!file_info_.eof) {
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const unsigned channels = file_info_.channels;
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const unsigned bytes_per_sample = (file_info_.bits_per_sample+7) / 8;
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const unsigned wide_samples = bytes / channels / bytes_per_sample;
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if(bytes&0x3)fprintf(stderr,"@@@ Got odd buffer size request\n");
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while(reservoir_samples_ < wide_samples) {
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if(decoder->state == FLAC__FILE_DECODER_END_OF_FILE) {
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file_info_.eof = true;
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break;
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}
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else if(!FLAC__file_decoder_process_one_frame(decoder_))
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break;
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}
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if(reservoir_samples_ > 0) {
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unsigned i, n = min(reservoir_samples_, wide_samples), delta;
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int16 output = (int16*)sample_buffer;
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for(i = 0; i < n*channels; i++)
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output[i] = reservoir_[i];
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delta = i;
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for( ; i < reservoir_samples_*channels; i++)
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reservoir[i-delta] = reservoir[i];
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reservoir_samples_ -= n;
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return_bytes = (int)(n * bytes_per_sample * channels);
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}
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else {
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file_info_.eof = true;
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}
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}
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return return_bytes;
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}
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int FLAC_Source::SetPosition(int position)
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{
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return 1; // seeking not possible
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const double distance = (double)position * 1000.0 / (double)file_info_.length_in_msec;
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unsigned target_sample = (unsigned)(distance * (double)file_info_.total_samples);
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if(FLAC__file_decoder_seek_absolute(decoder_, (uint64)target_sample)) {
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file_info_.eof = false;
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reservoir_samples_ = 0;
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return 0;
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}
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else {
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return 1;
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}
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}
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void FLAC_Source::cleanup()
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{
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if(decoder_ && decoder_->state != FLAC__FILE_DECODER_UNINITIALIZED)
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FLAC__file_decoder_finish(decoder_);
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reservoir_samples_ = 0;
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audio_error_ = false;
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file_info_.is_playing = false;
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file_info_.eof = false;
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file_info_.length_in_msec = -1;
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}
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@ -156,6 +271,118 @@ int FLAC_Source::SetPosition(int position)
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* local routines
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**********************************************************************/
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bool get_id3v1_tag_(const char *filename, id3v1_struct *tag)
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{
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const char *temp;
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FILE *f = fopen(filename, "rb");
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memset(tag, 0, sizeof(id3v1_struct));
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/* set the title and description to the filename by default */
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temp = strrchr(filename, '/');
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if(!temp)
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temp = filename;
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else
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temp++;
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strcpy(tag->description, temp);
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*strrchr(tag->description, '.') = '\0';
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strncpy(tag->title, tag->description, 30); tag->title[30] = '\0';
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if(0 == f)
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return false;
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if(-1 == fseek(f, -128, SEEK_END)) {
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fclose(f);
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return false;
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}
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if(fread(tag->raw, 1, 128, f) < 128) {
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fclose(f);
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return false;
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}
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fclose(f);
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if(strncmp(tag->raw, "TAG", 3))
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return false;
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else {
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char year_str[5];
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memcpy(tag->title, tag->raw+3, 30);
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memcpy(tag->artist, tag->raw+33, 30);
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memcpy(tag->album, tag->raw+63, 30);
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memcpy(year_str, tag->raw+93, 4); year_str[4] = '\0'; tag->year = atoi(year_str);
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memcpy(tag->comment, tag->raw+97, 30);
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tag->genre = (unsigned)((byte)tag->raw[127]);
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tag->track = (unsigned)((byte)tag->raw[126]);
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sprintf(tag->description, "%s - %s", tag->artist, tag->title);
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return true;
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}
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}
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bool decoder_init_(const char *filename)
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{
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if(decoder_ == 0)
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return false;
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decoder_->check_md5 = false; /* turn off MD5 checking in the decoder */
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if(FLAC__file_decoder_init(decoder_, filename, write_callback_, metadata_callback_, error_callback_, &file_info_) != FLAC__FILE_DECODER_OK)
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return false;
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file_info_.abort_flag = false;
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if(!FLAC__file_decoder_process_metadata(decoder_))
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return false;
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return true;
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}
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FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data)
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{
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file_info_struct *file_info = (file_info_struct *)client_data;
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const unsigned bps = file_info->bits_per_sample, channels = file_info->channels, wide_samples = frame->header.blocksize;
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unsigned wide_sample, sample, channel;
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(void)decoder;
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if(file_info->abort_flag)
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return FLAC__STREAM_DECODER_WRITE_ABORT;
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assert(bps == 16);
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for(sample = reservoir_samples_*channels, wide_sample = 0; wide_sample < wide_samples; wide_sample++)
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for(channel = 0; channel < channels; channel++, sample++)
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reservoir_[sample] = (int16)buffer[channel][wide_sample];
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reservoir_samples_ += wide_samples;
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return FLAC__STREAM_DECODER_WRITE_CONTINUE;
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}
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void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
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{
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file_info_struct *file_info = (file_info_struct *)client_data;
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(void)decoder;
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if(metadata->type == FLAC__METADATA_TYPE_ENCODING) {
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assert(metadata->data.encoding.total_samples < 0x100000000); /* this plugin can only handle < 4 gigasamples */
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file_info->total_samples = (unsigned)(metadata->data.encoding.total_samples&0xffffffff);
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file_info->bits_per_sample = metadata->data.encoding.bits_per_sample;
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file_info->channels = metadata->data.encoding.channels;
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file_info->sample_rate = metadata->data.encoding.sample_rate;
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if(file_info->bits_per_sample != 16) {
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file_info->abort_flag = true;
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return;
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}
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file_info->length_in_msec = file_info->total_samples * 10 / (file_info->sample_rate / 100);
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}
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}
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void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
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{
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file_info_struct *file_info = (file_info_struct *)client_data;
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(void)decoder;
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if(status != FLAC__STREAM_DECODER_ERROR_LOST_SYNC)
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file_info->abort_flag = true;
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}
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/***********************************************************************
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