* zero means that we did not retrieve a valid frame header, and a negative
* return value indicates an error.
*/
-static int get_header(FILE *file, struct mp3header *header)
+static int get_header(unsigned char *map, off_t numbytes, off_t *fpos,
+ struct mp3header *header)
{
- unsigned char buffer[FRAME_HEADER_SIZE];
int fl, ret;
- if (!file || !header)
- return -E_MP3_NO_FILE;
- ret = para_fread(buffer, FRAME_HEADER_SIZE, 1, file);
- if (ret < FRAME_HEADER_SIZE) {
+ if (*fpos + FRAME_HEADER_SIZE > numbytes) {
+ *fpos = numbytes - 1;
header->sync = 0;
- return ret < 0? ret : 0;
+ return 0;
}
- header->layer = (buffer[1] >> 1) & 3;
- header->sync = (((int)buffer[0]<<4) | ((int)(buffer[1]&0xE0)>>4));
- if (buffer[1] & 0x10)
- header->version = (buffer[1] >> 3) & 1;
+ header->layer = (map[*fpos + 1] >> 1) & 3;
+ header->sync = (((int)map[*fpos]<<4) | ((int)(map[*fpos + 1]&0xE0)>>4));
+ if (map[*fpos + 1] & 0x10)
+ header->version = (map[*fpos + 1] >> 3) & 1;
else
header->version = 2;
if ((header->sync != 0xFFE) || (header->layer != 1)) {
+ ret = 0;
header->sync = 0;
-// PARA_DEBUG_LOG("%s: header not found\n", __func__);
- return 0;
+ goto out;
}
- header->crc = buffer[1] & 1;
- header->bitrate = (buffer[2] >> 4) & 0x0F;
-// PARA_DEBUG_LOG("%s: found header, bitrate: %u\n", __func__,
-// header->bitrate);
- header->freq = (buffer[2] >> 2) & 0x3;
- header->padding = (buffer[2] >>1) & 0x1;
- header->mode = (buffer[3] >> 6) & 0x3;
+ header->crc = map[*fpos + 1] & 1;
+ header->bitrate = (map[*fpos + 2] >> 4) & 0x0F;
+ header->freq = (map[*fpos + 2] >> 2) & 0x3;
+ header->padding = (map[*fpos + 2] >>1) & 0x1;
+ header->mode = (map[*fpos + 3] >> 6) & 0x3;
fl = frame_length(header);
- return (fl >= MIN_FRAME_SIZE)? fl : -E_FRAME_LENGTH;
+ ret = (fl >= MIN_FRAME_SIZE)? fl : -E_FRAME_LENGTH;
+out:
+ *fpos += FRAME_HEADER_SIZE;
+ return ret;
}
/**
* returned.
*
*/
-static int mp3_seek_next_header(FILE *file)
+static int mp3_seek_next_header(unsigned char *map, off_t numbytes, off_t *fpos)
{
- int k, l = 0, c, first_len, ret;
+ int k, l = 0, first_len;
struct mp3header h, h2;
long valid_start = 0;
while (1) {
- while ((c = fgetc(file)) != 255 && (c != EOF))
- ; /* nothing */
- if (c != 255)
+ while ((*fpos)++ < numbytes && map[*fpos] != 0xff)
+ ;
+ if (*fpos >= numbytes)
return 0;
- ungetc(c, file);
- valid_start = ftell(file);
- first_len = get_header(file, &h);
+ valid_start = *fpos;
+ first_len = get_header(map, numbytes, fpos, &h);
if (first_len <= 0)
continue;
- ret = para_fseek(file, first_len - FRAME_HEADER_SIZE, SEEK_CUR);
- if (ret < 0)
- return ret;
+ *fpos += first_len - FRAME_HEADER_SIZE;
for (k = 1; k < MIN_CONSEC_GOOD_FRAMES; k++) {
- if ((l = get_header(file, &h2)) <= 0)
+ if ((l = get_header(map, numbytes, fpos, &h2)) <= 0)
break;
if (!compare_headers(&h, &h2))
break;
- ret = para_fseek(file, l - FRAME_HEADER_SIZE, SEEK_CUR);
- if (ret < 0)
- return ret;
+ *fpos += l - FRAME_HEADER_SIZE;
}
if (k == MIN_CONSEC_GOOD_FRAMES) {
- ret = para_fseek(file, valid_start, SEEK_SET);
- if (ret < 0)
- return ret;
+ *fpos = valid_start;
memcpy(&(mp3.header), &h2, sizeof(struct mp3header));
return first_len;
}
}
}
-static int mp3_get_id3(FILE *file)
+static void mp3_get_id3(unsigned char *map, off_t numbytes, off_t *fpos)
{
- char fbuf[4];
- int ret;
-
mp3.id3_isvalid = 0;
mp3.id3.title[0] = '\0';
mp3.id3.artist[0] = '\0';
mp3.id3.album[0] = '\0';
mp3.id3.comment[0] = '\0';
mp3.id3.year[0] = '\0';
- ret = para_fseek(file, -128, SEEK_END);
- if (ret < 0 )
- return ret;
- if (para_fread(fbuf, 1, 3, file) < 0)
- return -E_FREAD;
- fbuf[3] = '\0';
- if (strcmp("TAG", fbuf)) {
+ if (numbytes < 128)
+ return;
+ *fpos = numbytes - 128;
+ if (strncmp("TAG", map + *fpos, 3)) {
PARA_INFO_LOG("%s", "no id3 tag\n");
- return 0;
+ return;
}
- ret = para_fseek(file, -125, SEEK_END);
- if (ret < 0)
- return ret;
- if (para_fread(mp3.id3.title, 1, 30, file) != 30)
- return -E_FREAD;
+ *fpos = numbytes - 125;
+ memcpy(mp3.id3.title, map + *fpos, 30);
+ *fpos += 30;
mp3.id3.title[30] = '\0';
- if (para_fread(mp3.id3.artist, 1, 30, file) != 30)
- return -E_FREAD;
+ memcpy(mp3.id3.artist, map + *fpos, 30);
+ *fpos += 30;
mp3.id3.artist[30] = '\0';
- if (para_fread(mp3.id3.album, 1, 30, file) != 30)
- return -E_FREAD;
+ memcpy(mp3.id3.album, map + *fpos, 30);
+ *fpos += 30;
mp3.id3.album[30] = '\0';
- if (para_fread(mp3.id3.year, 1, 4, file) != 4)
- return -E_FREAD;
+ memcpy(mp3.id3.year, map + *fpos, 4);
+ *fpos += 4;
mp3.id3.year[4] = '\0';
- if (para_fread(mp3.id3.comment, 1, 30, file) != 30)
- return -E_FREAD;
+ memcpy(mp3.id3.comment, map + *fpos, 30);
mp3.id3.comment[30] = '\0';
mp3.id3_isvalid = 1;
unpad(mp3.id3.title);
unpad(mp3.id3.album);
unpad(mp3.id3.year);
unpad(mp3.id3.comment);
- return 1;
}
-static int find_valid_start(FILE *file)
+static int find_valid_start(unsigned char *map, off_t numbytes, off_t *fpos)
{
- int ret, frame_len;
+ int frame_len;
- frame_len = get_header(file, &mp3.header);
+ frame_len = get_header(map, numbytes, fpos, &mp3.header);
if (frame_len < 0)
return frame_len;
if (!frame_len) {
- frame_len = mp3_seek_next_header(file);
+ frame_len = mp3_seek_next_header(map, numbytes, fpos);
if (frame_len <= 0)
return frame_len;
- } else {
- ret = para_fseek(file, -FRAME_HEADER_SIZE, SEEK_CUR);
- if (ret < 0)
- return ret;
- }
+ } else
+ *fpos -= FRAME_HEADER_SIZE;
if (frame_len <= 1)
return -E_FRAME_LENGTH;
return frame_len;
}
-static int mp3_read_info(FILE *file, struct audio_format_info *afi)
+static int mp3_read_info(unsigned char *map, off_t numbytes,
+ 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 */
+ off_t fpos = 0;
afi->chunks_total = 0;
afi->chunk_table = para_malloc(chunk_table_size * sizeof(size_t));
- ret = mp3_get_id3(file);
- if (ret < 0)
- goto err_out;
- rewind(file);
+ mp3_get_id3(map, numbytes, &fpos);
+ fpos = 0;
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(file, len, SEEK_CUR);
- if (ret < 0)
- goto err_out;
- }
- len = find_valid_start(file);
+ fpos += len;
+ len = find_valid_start(map, numbytes, &fpos);
if (len <= 0)
break;
freq = header_frequency(&mp3.header);
afi->chunk_table = para_realloc(afi->chunk_table,
chunk_table_size * sizeof(size_t));
}
- afi->chunk_table[afi->chunks_total] = ftell(file);
+ afi->chunk_table[afi->chunks_total] = fpos;
// 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]);
}
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);
+ br_avg += (br - br_avg) / ((long)afi->chunks_total + 1);
if (old_br != br)
mp3.vbr = 1;
old_br = br;
ret = -E_MP3_INFO;
if (!afi->chunks_total || !freq_avg || !br_avg)
goto err_out;
- ret= para_fseek(file, 0, SEEK_END);
- if (ret < 0)
- goto err_out;
- afi->chunk_table[afi->chunks_total] = ftell(file);
+ afi->chunk_table[afi->chunks_total] = numbytes - 1;
mp3.br_average = br_avg;
mp3.freq = freq_avg;
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);
{
int ret;
- ret = mp3_read_info(file, afi);
+ ret = mp3_read_info((unsigned char *)map, numbytes, afi);
if (ret < 0)
return ret;
write_info_str(afi);
projects / paraslash.git / commitdiff