* to see before we decide we are looking at a real MP3 file
*/
#define MIN_CONSEC_GOOD_FRAMES 4
-
#define FRAME_HEADER_SIZE 4
#define MIN_FRAME_SIZE 21
struct id3tag id3;
int vbr;
long unsigned br_average;
- long unsigned seconds;
int freq;
};
static const int frame_size_index[] = {24000, 72000, 72000};
static const char *mode_text[] = {"stereo", "joint stereo", "dual channel", "mono", "invalid"};
-static FILE *infile;
static struct mp3info mp3;
-static ssize_t num_chunks;
static int header_frequency(struct mp3header *h)
{
int v = mp3.id3_isvalid;
snprintf(afi->info_string, MMD_INFO_SIZE,
- "audio_file_info1:%d x %lums, %lu kbit/s (%cbr) %i KHz %s\n"
+ "audio_file_info1:%lu x %lums, %lu kbit/s (%cbr) %i KHz %s\n"
"audio_file_info2:%s, by %s\n"
"audio_file_info3:A: %s, Y: %s, C: %s\n",
- num_chunks,
+ afi->chunks_total,
tv2ms(&afi->chunk_tv),
mp3.br_average,
mp3.vbr? 'v' : 'c',
* returned.
*
*/
-static int mp3_seek_next_header(void)
+static int mp3_seek_next_header(FILE *file)
{
int k, l = 0, c, first_len, ret;
struct mp3header h, h2;
long valid_start = 0;
while (1) {
- while ((c = fgetc(infile)) != 255 && (c != EOF))
+ while ((c = fgetc(file)) != 255 && (c != EOF))
; /* nothing */
if (c != 255)
return 0;
- ungetc(c, infile);
- valid_start = ftell(infile);
- first_len = get_header(infile, &h);
+ ungetc(c, file);
+ valid_start = ftell(file);
+ first_len = get_header(file, &h);
if (first_len <= 0)
continue;
- ret = para_fseek(infile, first_len - FRAME_HEADER_SIZE, SEEK_CUR);
+ ret = para_fseek(file, first_len - FRAME_HEADER_SIZE, SEEK_CUR);
if (ret < 0)
return ret;
for (k = 1; k < MIN_CONSEC_GOOD_FRAMES; k++) {
- if ((l = get_header(infile, &h2)) <= 0)
+ if ((l = get_header(file, &h2)) <= 0)
break;
if (!compare_headers(&h, &h2))
break;
- ret = para_fseek(infile, l - FRAME_HEADER_SIZE, SEEK_CUR);
+ ret = para_fseek(file, l - FRAME_HEADER_SIZE, SEEK_CUR);
if (ret < 0)
return ret;
}
if (k == MIN_CONSEC_GOOD_FRAMES) {
- ret = para_fseek(infile, valid_start, SEEK_SET);
+ ret = para_fseek(file, valid_start, SEEK_SET);
if (ret < 0)
return ret;
memcpy(&(mp3.header), &h2, sizeof(struct mp3header));
}
}
-static int mp3_get_id3(void)
+static int mp3_get_id3(FILE *file)
{
char fbuf[4];
int ret;
mp3.id3.album[0] = '\0';
mp3.id3.comment[0] = '\0';
mp3.id3.year[0] = '\0';
- ret = para_fseek(infile, -128, SEEK_END);
+ ret = para_fseek(file, -128, SEEK_END);
if (ret < 0 )
return ret;
- if (para_fread(fbuf, 1, 3, infile) < 0)
+ if (para_fread(fbuf, 1, 3, file) < 0)
return -E_FREAD;
fbuf[3] = '\0';
if (strcmp("TAG", fbuf)) {
PARA_INFO_LOG("%s", "no id3 tag\n");
return 0;
}
- ret = para_fseek(infile, -125, SEEK_END);
+ ret = para_fseek(file, -125, SEEK_END);
if (ret < 0)
return ret;
- if (para_fread(mp3.id3.title, 1, 30, infile) != 30)
+ if (para_fread(mp3.id3.title, 1, 30, file) != 30)
return -E_FREAD;
mp3.id3.title[30] = '\0';
- if (para_fread(mp3.id3.artist, 1, 30, infile) != 30)
+ if (para_fread(mp3.id3.artist, 1, 30, file) != 30)
return -E_FREAD;
mp3.id3.artist[30] = '\0';
- if (para_fread(mp3.id3.album, 1, 30, infile) != 30)
+ if (para_fread(mp3.id3.album, 1, 30, file) != 30)
return -E_FREAD;
mp3.id3.album[30] = '\0';
- if (para_fread(mp3.id3.year, 1, 4, infile) != 4)
+ if (para_fread(mp3.id3.year, 1, 4, file) != 4)
return -E_FREAD;
mp3.id3.year[4] = '\0';
- if (para_fread(mp3.id3.comment, 1, 30, infile) != 30)
+ if (para_fread(mp3.id3.comment, 1, 30, file) != 30)
return -E_FREAD;
mp3.id3.comment[30] = '\0';
mp3.id3_isvalid = 1;
return 1;
}
-static int find_valid_start(void)
+static int find_valid_start(FILE *file)
{
int ret, frame_len;
- if (!infile)
- return -E_MP3_NO_FILE;
- frame_len = get_header(infile, &mp3.header);
+ frame_len = get_header(file, &mp3.header);
if (frame_len < 0)
return frame_len;
if (!frame_len) {
- frame_len = mp3_seek_next_header();
+ frame_len = mp3_seek_next_header(file);
if (frame_len <= 0)
return frame_len;
} else {
- ret = para_fseek(infile, -FRAME_HEADER_SIZE, SEEK_CUR);
+ ret = para_fseek(file, -FRAME_HEADER_SIZE, SEEK_CUR);
if (ret < 0)
return ret;
}
return frame_len;
}
-static int mp3_read_info(struct audio_format_info *afi)
+static int mp3_read_info(FILE *file, struct audio_format_info *afi)
{
long fl_avg = 0, freq_avg = 0, br_avg = 0;
int ret, len = 0, old_br = -1;
struct timeval total_time = {0, 0};
unsigned chunk_table_size = 1000; /* gets increased on demand */
- num_chunks = 0;
+ afi->chunks_total = 0;
afi->chunk_table = para_malloc(chunk_table_size * sizeof(size_t));
- ret = mp3_get_id3();
+ ret = mp3_get_id3(file);
if (ret < 0)
goto err_out;
- rewind(infile);
+ rewind(file);
mp3.vbr = 0;
mp3.freq = 0;
while (1) {
int freq, br, fl;
struct timeval tmp, cct; /* current chunk time */
if (len > 0) {
- ret = para_fseek(infile, len, SEEK_CUR);
+ ret = para_fseek(file, len, SEEK_CUR);
if (ret < 0)
goto err_out;
}
- len = find_valid_start();
+ len = find_valid_start(file);
if (len <= 0)
break;
freq = header_frequency(&mp3.header);
tv_add(&cct, &total_time, &tmp);
total_time = tmp;
//PARA_DEBUG_LOG("%s: br: %d, freq: %d, fl: %d, cct: %lu\n", __func__, br, freq, fl, cct.tv_usec);
- if (num_chunks >= chunk_table_size) {
+ if (afi->chunks_total >= chunk_table_size) {
chunk_table_size *= 2;
afi->chunk_table = para_realloc(afi->chunk_table,
chunk_table_size * sizeof(size_t));
}
- afi->chunk_table[num_chunks] = ftell(infile);
- if (num_chunks < 10 || !(num_chunks % 1000))
- PARA_INFO_LOG("chunk #%d: %zd\n", num_chunks,
- afi->chunk_table[num_chunks]);
- num_chunks++;
- if (num_chunks == 1) {
-// entry = ftell(infile);
-// PARA_INFO_LOG("entry: %zd\n", entry);
+ afi->chunk_table[afi->chunks_total] = ftell(file);
+ if (afi->chunks_total < 10 || !(afi->chunks_total % 1000))
+ PARA_INFO_LOG("chunk #%lu: %zd\n", afi->chunks_total,
+ afi->chunk_table[afi->chunks_total]);
+ afi->chunks_total++;
+ if (afi->chunks_total == 1) {
freq_avg = freq;
br_avg = br;
old_br = br;
fl_avg = fl;
continue;
}
- freq_avg += (freq - freq_avg) / (num_chunks + 1);
- fl_avg += (fl - fl_avg) / (num_chunks + 1);
- br_avg += (br - br_avg) / (num_chunks + 1);
+ freq_avg += (freq - freq_avg) / (afi->chunks_total + 1);
+ fl_avg += (fl - fl_avg) / (afi->chunks_total + 1);
+ br_avg += (br - br_avg) / (afi->chunks_total + 1);
if (old_br != br)
mp3.vbr = 1;
old_br = br;
}
ret = -E_MP3_INFO;
- if (!num_chunks || !freq_avg || !br_avg)
+ if (!afi->chunks_total || !freq_avg || !br_avg)
goto err_out;
- ret= para_fseek(infile, 0, SEEK_END);
+ ret= para_fseek(file, 0, SEEK_END);
if (ret < 0)
goto err_out;
- afi->chunk_table[num_chunks] = ftell(infile);
+ afi->chunk_table[afi->chunks_total] = ftell(file);
mp3.br_average = br_avg;
mp3.freq = freq_avg;
- mp3.seconds = (tv2ms(&total_time) + 500) / 1000;
- tv_divide(num_chunks, &total_time, &afi->chunk_tv);
- rewind(infile);
- PARA_DEBUG_LOG("%zu chunks, each %lums\n", num_chunks, tv2ms(&afi->chunk_tv));
+ afi->seconds_total = (tv2ms(&total_time) + 500) / 1000;
+ tv_divide(afi->chunks_total, &total_time, &afi->chunk_tv);
+ rewind(file);
+ PARA_DEBUG_LOG("%lu chunks, each %lums\n", afi->chunks_total,
+ tv2ms(&afi->chunk_tv));
tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
PARA_DEBUG_LOG("eof timeout: %lu\n", tv2ms(&afi->eof_tv));
return 1;
/*
* Read mp3 information from audio file
*/
-static int mp3_get_file_info(FILE *audio_file, struct audio_format_info *afi)
+static int mp3_get_file_info(FILE *file, struct audio_format_info *afi)
{
int ret;
- if (!audio_file)
- return -E_MP3_NO_FILE;
- infile = audio_file;
- ret = mp3_read_info(afi);
- if (ret < 0) {
- infile = NULL;
+ ret = mp3_read_info(file, afi);
+ if (ret < 0)
return ret;
- }
write_info_str(afi);
- afi->chunks_total = num_chunks;
- afi->seconds_total = mp3.seconds;
if (afi->seconds_total < 2 || !afi->chunks_total)
return -E_MP3_INFO;
return 1;
}
-static void mp3_close_audio_file(void)
-{
- if (!infile)
- return;
- fclose(infile);
- infile = NULL;
-}
-
static const char* mp3_suffixes[] = {"mp3", NULL};
/**
* the init function of the mp3 audio format handler
*
- * \param p pointer to the struct to initialize
+ * \param afh pointer to the struct to initialize
*/
void mp3_init(struct audio_format_handler *afh)
{
afh->get_file_info = mp3_get_file_info;
- afh->close_audio_file = mp3_close_audio_file;
afh->suffixes = mp3_suffixes;
}
projects / paraslash.git / blobdiff