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/*
* Copyright (C) 2000-2007 the xine project
*
* This file is part of xine, a free video player.
*
* xine 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.
*
* xine 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*/
/*
* FLAC File Demuxer by Mike Melanson (melanson@pcisys.net)
* For more information on the FLAC file format, visit:
* http://flac.sourceforge.net/
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#define LOG_MODULE "demux_flac"
#define LOG_VERBOSE
/*
#define LOG
*/
#include <xine/xine_internal.h>
#include <xine/xineutils.h>
#include <xine/compat.h>
#include <xine/demux.h>
#include "bswap.h"
#include "group_audio.h"
#include "id3.h"
#include "flacutils.h"
typedef struct {
demux_plugin_t demux_plugin;
xine_stream_t *stream;
fifo_buffer_t *audio_fifo;
input_plugin_t *input;
int status;
int sample_rate;
int bits_per_sample;
int channels;
int64_t total_samples;
off_t data_start;
off_t data_size;
flac_seekpoint_t *seekpoints;
int seekpoint_count;
unsigned char streaminfo[sizeof(xine_waveformatex) + FLAC_STREAMINFO_SIZE];
} demux_flac_t;
typedef struct {
demux_class_t demux_class;
} demux_flac_class_t;
/* Open a flac file
* This function is called from the _open() function of this demuxer.
* It returns 1 if flac file was opened successfully. */
static int open_flac_file(demux_flac_t *flac) {
uint32_t signature;
unsigned char preamble[10];
unsigned int block_length;
unsigned char buffer[FLAC_SEEKPOINT_SIZE];
unsigned char *streaminfo = flac->streaminfo + sizeof(xine_waveformatex);
int i;
flac->seekpoints = NULL;
/* fetch the file signature, 4 bytes will read both the fLaC
* signature and the */
if (_x_demux_read_header(flac->input, &signature, 4) != 4)
return 0;
flac->input->seek(flac->input, 4, SEEK_SET);
/* Unfortunately some FLAC files have an ID3 flag prefixed on them
* before the actual FLAC headers... these are barely legal, but
* users use them and want them working, so check and skip the ID3
* tag if present.
*/
if ( id3v2_istag(signature) ) {
id3v2_parse_tag(flac->input, flac->stream, signature);
if ( flac->input->read(flac->input, &signature, 4) != 4 )
return 0;
}
/* validate signature */
if ( signature != ME_FOURCC('f', 'L', 'a', 'C') )
return 0;
/* loop through the metadata blocks; use a do-while construct since there
* will always be 1 metadata block */
do {
if (flac->input->read(flac->input, preamble, FLAC_SIGNATURE_SIZE) !=
FLAC_SIGNATURE_SIZE)
return 0;
block_length = (preamble[1] << 16) |
(preamble[2] << 8) |
(preamble[3] << 0);
switch (preamble[0] & 0x7F) {
/* STREAMINFO */
case 0:
lprintf ("STREAMINFO metadata\n");
if (block_length != FLAC_STREAMINFO_SIZE) {
lprintf ("expected STREAMINFO chunk of %d bytes\n",
FLAC_STREAMINFO_SIZE);
return 0;
}
if (flac->input->read(flac->input,
flac->streaminfo + sizeof(xine_waveformatex),
FLAC_STREAMINFO_SIZE) != FLAC_STREAMINFO_SIZE)
return 0;
flac->sample_rate = _X_BE_32(&streaminfo[10]);
flac->channels = ((flac->sample_rate >> 9) & 0x07) + 1;
flac->bits_per_sample = ((flac->sample_rate >> 4) & 0x1F) + 1;
flac->sample_rate >>= 12;
flac->total_samples = _X_BE_64(&streaminfo[10]) & UINT64_C(0x0FFFFFFFFF); /* 36 bits */
lprintf ("%d Hz, %d bits, %d channels, %"PRId64" total samples\n",
flac->sample_rate, flac->bits_per_sample,
flac->channels, flac->total_samples);
break;
/* PADDING */
case 1:
lprintf ("PADDING metadata\n");
flac->input->seek(flac->input, block_length, SEEK_CUR);
break;
/* APPLICATION */
case 2:
lprintf ("APPLICATION metadata\n");
flac->input->seek(flac->input, block_length, SEEK_CUR);
break;
/* SEEKTABLE */
case 3:
lprintf ("SEEKTABLE metadata, %d bytes\n", block_length);
flac->seekpoint_count = block_length / FLAC_SEEKPOINT_SIZE;
flac->seekpoints = xine_xcalloc(flac->seekpoint_count,
sizeof(flac_seekpoint_t));
if (flac->seekpoint_count && !flac->seekpoints)
return 0;
for (i = 0; i < flac->seekpoint_count; i++) {
if (flac->input->read(flac->input, buffer, FLAC_SEEKPOINT_SIZE) != FLAC_SEEKPOINT_SIZE)
return 0;
flac->seekpoints[i].sample_number = _X_BE_64(&buffer[0]);
lprintf (" %d: sample %"PRId64", ", i, flac->seekpoints[i].sample_number);
flac->seekpoints[i].offset = _X_BE_64(&buffer[8]);
flac->seekpoints[i].size = _X_BE_16(&buffer[16]);
lprintf ("@ 0x%"PRIX64", size = %d bytes, ",
flac->seekpoints[i].offset, flac->seekpoints[i].size);
flac->seekpoints[i].pts = flac->seekpoints[i].sample_number;
flac->seekpoints[i].pts *= 90000;
flac->seekpoints[i].pts /= flac->sample_rate;
lprintf ("pts = %"PRId64"\n", flac->seekpoints[i].pts);
}
break;
/* VORBIS_COMMENT
*
* For a description of the format please have a look at
* http://www.xiph.org/vorbis/doc/v-comment.html */
case 4:
lprintf ("VORBIS_COMMENT metadata\n");
{
char comments[block_length + 1]; /* last byte for NUL termination */
char *ptr = comments;
uint32_t length, user_comment_list_length, cn;
char *comment;
char c;
if (flac->input->read(flac->input, comments, block_length) == block_length) {
int tracknumber = -1;
int tracktotal = -1;
length = _X_LE_32(ptr);
ptr += 4 + length;
if (length > block_length - 8)
return 0; /* bad length or too little left in the buffer */
user_comment_list_length = _X_LE_32(ptr);
ptr += 4;
cn = 0;
for (; cn < user_comment_list_length; cn++) {
if (ptr > comments + block_length - 4)
return 0; /* too little left in the buffer */
length = _X_LE_32(ptr);
ptr += 4;
if (length >= block_length || ptr + length > comments + block_length)
return 0; /* bad length */
comment = (char*) ptr;
c = comment[length];
comment[length] = 0; /* NUL termination */
lprintf ("comment[%02d] = %s\n", cn, comment);
if ((strncasecmp ("TITLE=", comment, 6) == 0)
&& (length - 6 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_TITLE, comment + 6);
} else if ((strncasecmp ("ARTIST=", comment, 7) == 0)
&& (length - 7 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_ARTIST, comment + 7);
} else if ((strncasecmp ("ALBUM=", comment, 6) == 0)
&& (length - 6 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_ALBUM, comment + 6);
} else if ((strncasecmp ("DATE=", comment, 5) == 0)
&& (length - 5 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_YEAR, comment + 5);
} else if ((strncasecmp ("GENRE=", comment, 6) == 0)
&& (length - 6 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_GENRE, comment + 6);
} else if ((strncasecmp ("Comment=", comment, 8) == 0)
&& (length - 8 > 0)) {
_x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_COMMENT, comment + 8);
} else if ((strncasecmp ("TRACKNUMBER=", comment, 12) == 0)
&& (length - 12 > 0)) {
tracknumber = atoi (comment + 12);
} else if ((strncasecmp ("TRACKTOTAL=", comment, 11) == 0)
&& (length - 11 > 0)) {
tracktotal = atoi (comment + 11);
}
comment[length] = c;
ptr += length;
}
if ((tracknumber > 0) && (tracktotal > 0)) {
char tn[24];
snprintf (tn, 24, "%02d/%02d", tracknumber, tracktotal);
_x_meta_info_set(flac->stream, XINE_META_INFO_TRACK_NUMBER, tn);
}
else if (tracknumber > 0) {
char tn[16];
snprintf (tn, 16, "%02d", tracknumber);
_x_meta_info_set(flac->stream, XINE_META_INFO_TRACK_NUMBER, tn);
}
}
}
break;
/* CUESHEET */
case 5:
lprintf ("CUESHEET metadata\n");
flac->input->seek(flac->input, block_length, SEEK_CUR);
break;
/* 6-127 are presently reserved */
default:
lprintf ("unknown metadata chunk: %d\n", preamble[0] & 0x7F);
flac->input->seek(flac->input, block_length, SEEK_CUR);
break;
}
} while ((preamble[0] & 0x80) == 0);
flac->data_start = flac->input->get_current_pos(flac->input);
flac->data_size = flac->input->get_length(flac->input) - flac->data_start;
/* now at the beginning of the audio, adjust the seekpoint offsets */
for (i = 0; i < flac->seekpoint_count; i++) {
flac->seekpoints[i].offset += flac->data_start;
}
return 1;
}
static int demux_flac_send_chunk(demux_plugin_t *this_gen) {
demux_flac_t *this = (demux_flac_t *) this_gen;
buf_element_t *buf = NULL;
int64_t input_time_guess;
/* just send a buffer-sized chunk; let the decoder figure out the
* boundaries and let the engine figure out the pts */
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->type = BUF_AUDIO_FLAC;
if( this->data_size )
buf->extra_info->input_normpos = (int) ( (double) (this->input->get_current_pos(this->input) -
this->data_start) * 65535 / this->data_size );
buf->pts = 0;
buf->size = buf->max_size;
/*
* Estimate the input_time field based on file position:
*
* current_pos input time
* ----------- = ----------
* total_pos total time
*
* total time = total samples / sample rate * 1000
*/
/* do this one step at a time to make sure all the numbers stay safe */
input_time_guess = this->total_samples;
input_time_guess /= this->sample_rate;
input_time_guess *= 1000;
input_time_guess *= buf->extra_info->input_normpos;
input_time_guess /= 65535;
buf->extra_info->input_time = input_time_guess;
if (this->input->read(this->input, buf->content, buf->size) !=
buf->size) {
buf->free_buffer(buf);
this->status = DEMUX_FINISHED;
return this->status;
}
buf->decoder_flags |= BUF_FLAG_FRAME_END;
this->audio_fifo->put(this->audio_fifo, buf);
return this->status;
}
static void demux_flac_send_headers(demux_plugin_t *this_gen) {
demux_flac_t *this = (demux_flac_t *) this_gen;
buf_element_t *buf;
xine_waveformatex wave;
this->audio_fifo = this->stream->audio_fifo;
/* send start buffers */
_x_demux_control_start(this->stream);
if ( ! this->audio_fifo )
{
this->status = DEMUX_FINISHED;
return;
}
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->type = BUF_AUDIO_FLAC;
buf->decoder_flags = BUF_FLAG_HEADER|BUF_FLAG_STDHEADER|BUF_FLAG_FRAME_END;
buf->decoder_info[0] = 0;
buf->decoder_info[1] = this->sample_rate;
buf->decoder_info[2] = this->bits_per_sample;
buf->decoder_info[3] = this->channels;
/* copy the faux WAV header */
buf->size = sizeof(xine_waveformatex) + FLAC_STREAMINFO_SIZE;
memcpy(buf->content, this->streaminfo, buf->size);
/* forge a WAV header with the proper length */
wave.cbSize = FLAC_STREAMINFO_SIZE;
memcpy(buf->content, &wave, sizeof(xine_waveformatex));
this->audio_fifo->put (this->audio_fifo, buf);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_VIDEO, 0);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_AUDIO, 1);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_CHANNELS,
this->channels);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_SAMPLERATE,
this->sample_rate);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITS,
this->bits_per_sample);
this->status = DEMUX_OK;
}
static int demux_flac_seek (demux_plugin_t *this_gen,
off_t start_pos, int start_time, int playing) {
demux_flac_t *this = (demux_flac_t *) this_gen;
int seekpoint_index = 0;
int64_t start_pts;
start_pos = (off_t) ( (double) start_pos / 65535 *
this->data_size );
/* if thread is not running, initialize demuxer */
if( !playing ) {
/* send new pts */
_x_demux_control_newpts(this->stream, 0, 0);
this->status = DEMUX_OK;
} else {
if (this->seekpoints == NULL) {
/* cannot seek if there is no seekpoints */
this->status = DEMUX_OK;
return this->status;
}
/* do a lazy, linear seek based on the assumption that there are not
* that many seek points */
if (start_pos) {
/* offset-based seek */
if (start_pos < this->seekpoints[0].offset)
seekpoint_index = 0;
else {
for (seekpoint_index = 0; seekpoint_index < this->seekpoint_count - 1;
seekpoint_index++) {
if (start_pos < this->seekpoints[seekpoint_index + 1].offset) {
break;
}
}
}
} else {
/* time-based seek */
start_pts = start_time;
start_pts *= 90;
if (start_pts < this->seekpoints[0].pts)
seekpoint_index = 0;
else {
for (seekpoint_index = 0; seekpoint_index < this->seekpoint_count - 1;
seekpoint_index++) {
if (start_pts < this->seekpoints[seekpoint_index + 1].pts) {
break;
}
}
}
}
_x_demux_flush_engine(this->stream);
this->input->seek(this->input, this->seekpoints[seekpoint_index].offset,
SEEK_SET);
_x_demux_control_newpts(this->stream,
this->seekpoints[seekpoint_index].pts, BUF_FLAG_SEEK);
}
return this->status;
}
static int demux_flac_get_status (demux_plugin_t *this_gen) {
demux_flac_t *this = (demux_flac_t *) this_gen;
return this->status;
}
static int demux_flac_get_stream_length (demux_plugin_t *this_gen) {
demux_flac_t *this = (demux_flac_t *) this_gen;
int64_t length = this->total_samples;
length *= 1000;
length /= this->sample_rate;
return length;
}
static uint32_t demux_flac_get_capabilities(demux_plugin_t *this_gen) {
return DEMUX_CAP_NOCAP;
}
static int demux_flac_get_optional_data(demux_plugin_t *this_gen,
void *data, int data_type) {
return DEMUX_OPTIONAL_UNSUPPORTED;
}
static demux_plugin_t *open_plugin (demux_class_t *class_gen, xine_stream_t *stream,
input_plugin_t *input) {
demux_flac_t *this;
/* this should change eventually... */
if (!INPUT_IS_SEEKABLE(input)) {
xprintf(stream->xine, XINE_VERBOSITY_DEBUG, "input not seekable, can not handle!\n");
return NULL;
}
this = xine_xmalloc (sizeof (demux_flac_t));
this->stream = stream;
this->input = input;
this->demux_plugin.send_headers = demux_flac_send_headers;
this->demux_plugin.send_chunk = demux_flac_send_chunk;
this->demux_plugin.seek = demux_flac_seek;
this->demux_plugin.dispose = default_demux_plugin_dispose;
this->demux_plugin.get_status = demux_flac_get_status;
this->demux_plugin.get_stream_length = demux_flac_get_stream_length;
this->demux_plugin.get_capabilities = demux_flac_get_capabilities;
this->demux_plugin.get_optional_data = demux_flac_get_optional_data;
this->demux_plugin.demux_class = class_gen;
this->status = DEMUX_FINISHED;
switch (stream->content_detection_method) {
case METHOD_BY_MRL:
case METHOD_BY_CONTENT:
case METHOD_EXPLICIT:
if (!open_flac_file(this)) {
free (this);
return NULL;
}
break;
default:
free (this);
return NULL;
}
return &this->demux_plugin;
}
void *demux_flac_init_plugin (xine_t *xine, void *data) {
demux_flac_class_t *this;
this = xine_xmalloc (sizeof (demux_flac_class_t));
this->demux_class.open_plugin = open_plugin;
this->demux_class.description = N_("Free Lossless Audio Codec (flac) demux plugin");
this->demux_class.identifier = "FLAC";
this->demux_class.mimetypes =
"audio/x-flac: flac: FLAC Audio;"
"audio/flac: flac: FLAC Audio;";
this->demux_class.extensions = "flac";
this->demux_class.dispose = default_demux_class_dispose;
return this;
}