/*
* Copyright (C) 2003-2007 Andre Noll <maan@systemlinux.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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file mp3_afh.c para_server's mp3 audio format handler */
* Johannes Overmann <overmann@iname.com>
*/
-#include "server.cmdline.h"
#include "server.h"
-#include "vss.h"
-#include "afh.h"
#include "error.h"
-#include "fd.h"
#include "string.h"
/** \cond some defines and structs which are only used in this file */
* 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
int id3_isvalid;
struct id3tag id3;
int vbr;
- long unsigned br_average;
- long unsigned seconds;
- int freq;
};
/** \endcond */
-static int frequencies[3][4] = {
+static const int frequencies[3][4] = {
{22050,24000,16000,50000}, /* MPEG 2.0 */
{44100,48000,32000,50000}, /* MPEG 1.0 */
{11025,12000,8000,50000} /* MPEG 2.5 */
};
-static int mp3info_bitrate[2][3][14] = {
+static const int mp3info_bitrate[2][3][14] = {
{ /* MPEG 2.0 */
{32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
{8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
}
};
-static int frame_size_index[] = {24000, 72000, 72000};
+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 struct audio_format_handler *af;
-static ssize_t *chunk_table, num_chunks;
static int header_frequency(struct mp3header *h)
{
h->mode = 4; /* invalid */
return mode_text[h->mode];
}
+
+static int header_channels(struct mp3header *h)
+{
+ if (h->mode > 3)
+ return 0;
+ if (h->mode < 3)
+ return 2;
+ return 1;
+}
+
static int header_bitrate(struct mp3header *h)
{
- if (h->layer > 3 || h->bitrate > 14)
+ if (!h->layer || h->layer > 3 || h->bitrate > 14 || !h->bitrate)
return -E_HEADER_BITRATE;
return mp3info_bitrate[h->version & 1][3 - h->layer][h->bitrate - 1];
}
+ header->padding;
}
-static void write_info_str(char *info_str)
+static void write_info_str(struct audio_format_info *afi)
{
int v = mp3.id3_isvalid;
- snprintf(info_str, MMD_INFO_SIZE,
- "audio_file_info1:%d x %lums, %lu kbit/s (%cbr) %i KHz %s\n"
+ snprintf(afi->info_string, MMD_INFO_SIZE,
+ "audio_file_info1:%lu x %lums, %u 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,
- tv2ms(&af->chunk_tv),
- mp3.br_average,
+ afi->chunks_total,
+ tv2ms(&afi->chunk_tv),
+ afi->bitrate,
mp3.vbr? 'v' : 'c',
- mp3.freq / 1000,
+ afi->frequency / 1000,
header_mode(&mp3.header),
v && *mp3.id3.title? mp3.id3.title : "(title tag not set)",
v && *mp3.id3.artist? mp3.id3.artist : "(artist tag not set)",
(h1->original == h2->original) &&
(h1->emphasis == h2->emphasis))
return 1;
- else
- return 0;
+ return 0;
}
-/**
+/*
* get next MP3 frame header.
*
- * \param stream to read the header from
- * \param header structure that gets filled in by get_header()
- *
- * \return On success, the header frame length is returned. A return value of
- * zero means that we did not retrieve a valid frame header, and a negative
- * return value indicates an error.
+ * On success, the header frame length is returned and the given header
+ * structure that is filled in. A return value of 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, size_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;
}
-/**
+/*
* find the next mp3 header
*
- * \return On success, the length of the next frame header. If the end of the
- * file was reached, the function returns zero. On errors, a negative value is
- * returned.
- *
+ * Return the length of the next frame header or zero if the end of the file is
+ * reached.
*/
-static int mp3_seek_next_header(void)
+static int mp3_seek_next_header(unsigned char *map, size_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(infile)) != 255 && (c != EOF))
- ; /* nothing */
- if (c != 255)
- return 0;
- ungetc(c, infile);
- valid_start = ftell(infile);
- first_len = get_header(infile, &h);
+ for (; *fpos < numbytes; (*fpos)++) {
+ if (map[*fpos] != 0xff)
+ continue;
+ valid_start = *fpos;
+ first_len = get_header(map, numbytes, fpos, &h);
if (first_len <= 0)
continue;
- ret = para_fseek(infile, 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(infile, &h2)) <= 0)
+ if ((l = get_header(map, numbytes, fpos, &h2)) <= 0)
break;
if (!compare_headers(&h, &h2))
break;
- ret = para_fseek(infile, 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(infile, valid_start, SEEK_SET);
- if (ret < 0)
- return ret;
+ *fpos = valid_start;
memcpy(&(mp3.header), &h2, sizeof(struct mp3header));
return first_len;
}
}
+ return 0;
}
-static int mp3_get_id3(void)
+static void mp3_get_id3(unsigned char *map, size_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(infile, -128, SEEK_END);
- if (ret < 0 )
- return ret;
- if (para_fread(fbuf, 1, 3, infile) < 0)
- return -E_FREAD;
- fbuf[3] = '\0';
- if (strcmp("TAG", fbuf)) {
+ if (numbytes < 128)
+ return;
+ *fpos = numbytes - 128;
+ if (strncmp("TAG", (char *) map + *fpos, 3)) {
PARA_INFO_LOG("%s", "no id3 tag\n");
- return 0;
+ return;
}
- ret = para_fseek(infile, -125, SEEK_END);
- if (ret < 0)
- return ret;
- if (para_fread(mp3.id3.title, 1, 30, infile) != 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, infile) != 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, infile) != 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, infile) != 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, infile) != 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(void)
+static int find_valid_start(unsigned char *map, size_t numbytes, off_t *fpos)
{
- int ret, frame_len;
+ int frame_len;
- if (!infile)
- return -E_MP3_NO_FILE;
- frame_len = get_header(infile, &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();
+ frame_len = mp3_seek_next_header(map, numbytes, fpos);
if (frame_len <= 0)
return frame_len;
- } else {
- ret = para_fseek(infile, -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(void)
+static int mp3_read_info(unsigned char *map, size_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;
- num_chunks = 0;
- chunk_table = para_malloc(chunk_table_size * sizeof(size_t));
- ret = mp3_get_id3();
- if (ret < 0)
- goto err_out;
- rewind(infile);
+ afi->chunks_total = 0;
+ afi->chunk_table = para_malloc(chunk_table_size * sizeof(size_t));
+ mp3_get_id3(map, numbytes, &fpos);
+ fpos = 0;
mp3.vbr = 0;
- mp3.freq = 0;
while (1) {
- int freq, br, fl;
+ unsigned long freq, br, fl;
struct timeval tmp, cct; /* current chunk time */
- if (len > 0) {
- ret = para_fseek(infile, len, SEEK_CUR);
- if (ret < 0)
- goto err_out;
- }
- len = find_valid_start();
+ fpos += len;
+ len = find_valid_start(map, numbytes, &fpos);
if (len <= 0)
break;
- freq = header_frequency(&mp3.header);
- br = header_bitrate(&mp3.header);
- fl = frame_length(&mp3.header);
- if (freq < 0 || br < 0 || fl < 0)
+ ret = header_frequency(&mp3.header);
+ if (ret < 0)
continue;
+ freq = ret;
+ ret = header_bitrate(&mp3.header);
+ if (ret < 0)
+ continue;
+ br = ret;
+ ret = frame_length(&mp3.header);
+ if (ret < 0)
+ continue;
+ fl = ret;
tmp.tv_sec = fl;
tmp.tv_usec = 0;
tv_divide(br * 125, &tmp, &cct);
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;
- chunk_table = para_realloc(chunk_table,
+ afi->chunk_table = para_realloc(afi->chunk_table,
chunk_table_size * sizeof(size_t));
}
- chunk_table[num_chunks] = ftell(infile);
- if (num_chunks < 10 || !(num_chunks % 1000))
- PARA_INFO_LOG("chunk #%d: %zd\n", num_chunks,
- 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] = 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]);
+ 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 += ((long)freq - freq_avg) / ((long)afi->chunks_total + 1);
+ fl_avg += ((long)fl - fl_avg) / ((long)afi->chunks_total + 1);
+ br_avg += ((long)br - br_avg) / ((long)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)
- goto err_out;
- ret= para_fseek(infile, 0, SEEK_END);
- if (ret < 0)
+ if (!afi->chunks_total || !freq_avg || !br_avg)
goto err_out;
- chunk_table[num_chunks] = ftell(infile);
- mp3.br_average = br_avg;
- mp3.freq = freq_avg;
- mp3.seconds = (tv2ms(&total_time) + 500) / 1000;
- tv_divide(num_chunks, &total_time, &af->chunk_tv);
- rewind(infile);
- PARA_DEBUG_LOG("%zu chunks, each %lums\n", num_chunks, tv2ms(&af->chunk_tv));
- tv_scale(3, &af->chunk_tv, &af->eof_tv);
- PARA_DEBUG_LOG("eof timeout: %lu\n", tv2ms(&af->eof_tv));
+ afi->chunk_table[afi->chunks_total] = numbytes - 1;
+ afi->bitrate = br_avg;
+ afi->frequency = freq_avg;
+ afi->channels = header_channels(&mp3.header);
+ afi->seconds_total = (tv2ms(&total_time) + 500) / 1000;
+ tv_divide(afi->chunks_total, &total_time, &afi->chunk_tv);
+ 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;
err_out:
PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
- free(chunk_table);
+ free(afi->chunk_table);
return ret;
}
/*
* Read mp3 information from audio file
*/
-static int mp3_get_file_info(FILE *audio_file, char *info_str,
- long unsigned *frames, int *seconds, size_t **vss_chunk_table)
+static int mp3_get_file_info(char *map, size_t numbytes,
+ struct audio_format_info *afi)
{
int ret;
- if (!audio_file)
- return -E_MP3_NO_FILE;
- infile = audio_file;
- ret = mp3_read_info();
- if (ret < 0) {
- infile = NULL;
+ ret = mp3_read_info((unsigned char *)map, numbytes, afi);
+ if (ret < 0)
return ret;
- }
- write_info_str(info_str);
- *frames = num_chunks;
- *seconds = mp3.seconds;
- *vss_chunk_table = chunk_table;
- if (*seconds < 2 || !*frames)
+ write_info_str(afi);
+ 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;
- free(chunk_table);
-}
-
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 *p)
+void mp3_init(struct audio_format_handler *afh)
{
- af = p;
- af->get_file_info = mp3_get_file_info;
- af->close_audio_file = mp3_close_audio_file;
- af->get_header_info = NULL;
- /* eof_tv gets overwritten in mp3_get_file_info() */
- af->eof_tv.tv_sec = 0;
- af->eof_tv.tv_usec = 100 * 1000;
- af->suffixes = mp3_suffixes;
+ afh->get_file_info = mp3_get_file_info;
+ afh->suffixes = mp3_suffixes;
}
projects / paraslash.git / blobdiff