/*
* NAME: synth->init()
* DESCRIPTION: initialize synth struct
*/
void mad_synth_init(struct mad_synth *synth) {
mad_synth_mute(synth);
synth->phase = 0;
synth->pcm.samplerate = 0;
synth->pcm.channels = 0;
synth->pcm.length = 0;
}
static void
reset_stream_parameters (mp3d_prc_t * ap_prc)
{
assert (ap_prc);
mad_frame_mute (&ap_prc->frame_);
mad_synth_mute (&ap_prc->synth_);
tiz_mem_set (ap_prc->in_buff_, 0, INPUT_BUFFER_SIZE + MAD_BUFFER_GUARD);
ap_prc->remaining_ = 0;
ap_prc->frame_count_ = 0;
ap_prc->next_synth_sample_ = 0;
ap_prc->eos_ = false;
}
SINT SoundSourceMp3::restartDecoding(
const SeekFrameType& seekFrame) {
qDebug() << "restartDecoding @" << seekFrame.frameIndex;
// Discard decoded output
m_madSynthCount = 0;
if (getMinFrameIndex() == seekFrame.frameIndex) {
mad_frame_finish(&m_madFrame);
mad_synth_finish(&m_madSynth);
}
mad_stream_finish(&m_madStream);
mad_stream_init(&m_madStream);
mad_stream_options(&m_madStream, MAD_OPTION_IGNORECRC);
if (getMinFrameIndex() == seekFrame.frameIndex) {
mad_synth_init(&m_madSynth);
mad_frame_init(&m_madFrame);
}
// Fill input buffer
mad_stream_buffer(&m_madStream, seekFrame.pInputData,
m_fileSize - (seekFrame.pInputData - m_pFileData));
if (getMinFrameIndex() < seekFrame.frameIndex) {
// Muting is done here to eliminate potential pops/clicks
// from skipping Rob Leslie explains why here:
// http://www.mars.org/mailman/public/mad-dev/2001-August/000321.html
mad_frame_mute(&m_madFrame);
mad_synth_mute(&m_madSynth);
}
if (!decodeFrameHeader(&m_madFrame.header, &m_madStream, false)) {
if (!isStreamValid(m_madStream)) {
// Failure -> Seek to EOF
return getFrameCount();
}
}
return seekFrame.frameIndex;
}
bool RageSoundReader_MP3::MADLIB_rewind()
{
m_pFile->Seek(0);
mad_frame_mute(&mad->Frame);
mad_synth_mute(&mad->Synth);
mad_timer_reset(&mad->Timer);
mad->outpos = mad->outleft = 0;
mad_stream_finish(&mad->Stream);
mad_stream_init(&mad->Stream);
mad_stream_buffer(&mad->Stream, NULL, 0);
mad->inbuf_filepos = 0;
/* Be careful. We need to leave header_bytes alone, so if we try to SetPosition_estimate
* immediately after this, we still know the header size. However, we need to set first_frame
* to true, since the first frame is handled specially in do_mad_frame_decode; if we don't
* set it, then we'll be desynced by a frame after an accurate seek. */
// mad->header_bytes = 0;
mad->first_frame = true;
mad->Stream.this_frame = NULL;
return true;
}
/* Seek to a byte in the file. If you're going to put the file position
* back when you're done, and not going to read any data, you don't have
* to use this. */
int RageSoundReader_MP3::seek_stream_to_byte( int byte )
{
if( m_pFile->Seek(byte) == -1 )
{
SetError( strerror(errno) );
return 0;
}
mad_frame_mute(&mad->Frame);
mad_synth_mute(&mad->Synth);
mad_stream_finish(&mad->Stream);
mad_stream_init(&mad->Stream);
mad->outleft = mad->outpos = 0;
mad->inbuf_filepos = byte;
/* If the position is <= the position of the first audio sample, then
* we're at the beginning. */
if( !mad->tocmap.empty() )
mad->first_frame = ( byte <= mad->tocmap.begin()->second );
return 1;
}
/* Handle first-stage decoding: extracting the MP3 frame data. */
int RageSoundReader_MP3::do_mad_frame_decode( bool headers_only )
{
int bytes_read = 0;
while(1)
{
int ret;
/* Always actually decode the first packet, so we cleanly parse Xing tags. */
if( headers_only && !mad->first_frame )
ret=mad_header_decode( &mad->Frame.header,&mad->Stream );
else
ret=mad_frame_decode( &mad->Frame,&mad->Stream );
if( ret == -1 && (mad->Stream.error == MAD_ERROR_BUFLEN || mad->Stream.error == MAD_ERROR_BUFPTR) )
{
if( bytes_read > 25000 )
{
/* We've read this much without actually getting a frame; error. */
SetError( "Can't find data" );
return -1;
}
ret = fill_buffer();
if( ret <= 0 )
return ret;
bytes_read += ret;
continue;
}
if( ret == -1 && mad->Stream.error == MAD_ERROR_LOSTSYNC )
{
/* This might be an ID3V2 tag. */
const int tagsize = id3_tag_query(mad->Stream.this_frame,
mad->Stream.bufend - mad->Stream.this_frame);
if( tagsize )
{
mad_stream_skip(&mad->Stream, tagsize);
/* Don't count the tagsize against the max-read-per-call figure. */
bytes_read -= tagsize;
continue;
}
}
if( ret == -1 && mad->Stream.error == MAD_ERROR_BADDATAPTR )
{
/*
* Something's corrupt. One cause of this is cutting an MP3 in the middle
* without reencoding; the first two frames will reference data from previous
* frames that have been removed. The frame is valid--we can get a header from
* it, we just can't synth useful data.
*
* BASS pretends the bad frames are silent. Emulate that, for compatibility.
*/
ret = 0; /* pretend success */
}
if( !ret )
{
/* OK. */
if( mad->first_frame )
{
/* We're at the beginning. Is this a Xing tag? */
if(handle_first_frame())
{
/* The first frame contained a header. Continue searching. */
continue;
}
/* We've decoded the first frame of data.
*
* We want mad->Timer to represent the timestamp of the first sample of the
* currently decoded frame. Don't increment mad->Timer on the first frame,
* or it'll be the time of the *next* frame. (All frames have the same
* duration.) */
mad->first_frame = false;
mad->Timer = mad_timer_zero;
mad->header_bytes = get_this_frame_byte(mad);
}
else
{
mad_timer_add( &mad->Timer,mad->Frame.header.duration );
}
fill_frame_index_cache( mad );
return 1;
}
if( mad->Stream.error == MAD_ERROR_BADCRC )
{
/* XXX untested */
mad_frame_mute(&mad->Frame);
mad_synth_mute(&mad->Synth);
continue;
}
if( !MAD_RECOVERABLE(mad->Stream.error) )
{
/* We've received an unrecoverable error. */
SetError( mad_stream_errorstr(&mad->Stream) );
return -1;
}
}
}
