/*
* NAME: frame->init()
* DESCRIPTION: initialize frame struct
*/
void mad_frame_init(struct mad_frame *frame)
{
mad_header_init(&frame->header);
frame->options = 0;
// frame->overlap = 0;
mad_frame_mute(frame);
}
static struct mp3_data *mp3_open_internal (const char *file,
const int buffered)
{
struct mp3_data *data;
data = (struct mp3_data *)xmalloc (sizeof(struct mp3_data));
data->ok = 0;
decoder_error_init (&data->error);
/* Reset information about the file */
data->freq = 0;
data->channels = 0;
data->skip_frames = 0;
data->bitrate = -1;
data->avg_bitrate = -1;
/* Open the file */
data->io_stream = io_open (file, buffered);
if (io_ok(data->io_stream)) {
data->ok = 1;
data->size = io_file_size (data->io_stream);
mad_stream_init (&data->stream);
mad_frame_init (&data->frame);
mad_synth_init (&data->synth);
if (options_get_int("Mp3IgnoreCRCErrors"))
mad_stream_options (&data->stream,
MAD_OPTION_IGNORECRC);
data->duration = count_time_internal (data);
mad_frame_mute (&data->frame);
data->stream.next_frame = NULL;
data->stream.sync = 0;
data->stream.error = MAD_ERROR_NONE;
if (io_seek(data->io_stream, SEEK_SET, 0) == (off_t)-1) {
decoder_error (&data->error, ERROR_FATAL, 0,
"seek failed");
io_close (data->io_stream);
mad_stream_finish (&data->stream);
mad_frame_finish (&data->frame);
mad_synth_finish (&data->synth);
data->ok = 0;
}
data->stream.error = MAD_ERROR_BUFLEN;
}
else {
decoder_error (&data->error, ERROR_FATAL, 0, "Can't open: %s",
io_strerror(data->io_stream));
io_close (data->io_stream);
}
return data;
}
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;
}
static
enum mad_flow error_default(void *data, struct mad_stream *stream,
struct mad_frame *frame) {
int *bad_last_frame = data;
switch (stream->error) {
case MAD_ERROR_BADCRC:
if (*bad_last_frame)
mad_frame_mute(frame);
else
*bad_last_frame = 1;
return MAD_FLOW_IGNORE;
default:
return MAD_FLOW_CONTINUE;
}
}
RageSoundReader_MP3::RageSoundReader_MP3()
{
mad = new madlib_t;
m_bAccurateSync = false;
mad_stream_init( &mad->Stream );
mad_frame_init( &mad->Frame );
mad_synth_init( &mad->Synth );
mad_frame_mute( &mad->Frame );
mad_timer_reset( &mad->Timer );
mad->length = -1;
mad->inbuf_filepos = 0;
mad->header_bytes = 0;
mad->has_xing = false;
mad->timer_accurate = 1;
mad->bitrate = -1;
mad->first_frame = true;
}
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;
}
}
}
static int mad_play_frame(input_object *obj, char *buf)
{
struct mad_local_data *data;
struct mad_pcm *pcm;
mad_fixed_t const *left_ch;
mad_fixed_t const *right_ch;
int16_t *output;
int nsamples;
int nchannels;
if (!obj)
return 0;
data = (struct mad_local_data *)obj->local_data;
if (!data)
return 0;
if (data->bytes_avail < 3072) {
/*
alsaplayer_error("Filling buffer = %d,%d",
data->bytes_avail,
data->map_offset + MAD_BUFSIZE - data->bytes_avail);
*/
fill_buffer(data, -1); /* data->map_offset + MAD_BUFSIZE - data->bytes_avail); */
mad_stream_buffer(&data->stream, data->mad_map, data->bytes_avail);
} else {
/* alsaplayer_error("bytes_avail = %d", data->bytes_avail); */
}
if (mad_frame_decode(&data->frame, &data->stream) == -1) {
if (!MAD_RECOVERABLE(data->stream.error)) {
/*
alsaplayer_error("MAD error: %s (%d). fatal",
error_str(data->stream.error, data->str),
data->bytes_avail);
*/
mad_frame_mute(&data->frame);
return 0;
} else {
if (reader_eof(data->mad_fd)) {
return 0;
}
//alsaplayer_error("MAD error: %s (not fatal)", error_str(data->stream.error, data->str));
memset(buf, 0, obj->frame_size);
return 1;
}
}
data->current_frame++;
if (data->seekable && data->current_frame < (obj->nr_frames + FRAME_RESERVE)) {
data->frames[data->current_frame] =
data->map_offset + data->stream.this_frame - data->mad_map;
if (data->current_frame > 3 &&
(data->frames[data->current_frame] -
data->frames[data->current_frame-3]) < 6) {
return 0;
}
if (data->highest_frame < data->current_frame)
data->highest_frame = data->current_frame;
}
mad_synth_frame (&data->synth, &data->frame);
{
pcm = &data->synth.pcm;
output = (int16_t *)buf;
nsamples = pcm->length;
nchannels = pcm->channels;
if (nchannels != obj->nr_channels) {
alsaplayer_error("ERROR: bad data stream! (channels: %d != %d, frame %d)",
nchannels,
obj->nr_channels,
data->current_frame);
mad_frame_mute(&data->frame);
memset(buf, 0, obj->frame_size);
return 1;
}
obj->nr_channels = nchannels;
if (data->samplerate != data->frame.header.samplerate) {
alsaplayer_error("ERROR: bad data stream! (samplerate: %d != %d, frame %d)",
data->samplerate,
data->frame.header.samplerate,
data->current_frame);
mad_frame_mute(&data->frame);
memset(buf, 0, obj->frame_size);
return 1;
}
data->samplerate = data->frame.header.samplerate;
left_ch = pcm->samples[0];
right_ch = pcm->samples[1];
while (nsamples--) {
*output++ = my_scale(*(left_ch++));
if (nchannels == 1) {
*output++ = my_scale(*(left_ch-1));
} else { /* nchannels == 2 */
*output++ = my_scale(*(right_ch++));
}
}
}
data->bytes_avail = data->stream.bufend - data->stream.next_frame;
return 1;
}
