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input/CdioParanoia: remove loop from Read() 

The Read() method is not required to fill the whole buffer.  By
returning as soon as at least one byte was read, we allow faster
cancellation.
This commit is contained in:
Max Kellermann 2022-07-08 12:26:52 +02:00
parent 5573e78364
commit c32dceb4d4
2 changed files with 38 additions and 47 deletions
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1
NEWS
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@ -3,6 +3,7 @@ ver 0.23.8 (not yet released)
- curl: fix crash if web server does not understand WebDAV
* input
- cdio_paranoia: fix crash if no drive was found
- cdio_paranoia: faster cancellation
* output
- pipewire: fix crash with PipeWire 0.3.53
* mixer

84
src/input/plugins/CdioParanoiaInputPlugin.cxx
View File

@ -288,62 +288,52 @@ size_t
CdioParanoiaInputStream::Read(std::unique_lock<Mutex> &,
void *ptr, size_t length)
{
size_t nbytes = 0;
char *wptr = (char *) ptr;
/* end of track ? */
if (IsEOF())
return 0;
while (length > 0) {
/* end of track ? */
if (IsEOF())
break;
//current sector was changed ?
const int16_t *rbuf;
//current sector was changed ?
const int16_t *rbuf;
const int32_t lsn_relofs = offset / CDIO_CD_FRAMESIZE_RAW;
if (lsn_relofs != buffer_lsn) {
const ScopeUnlock unlock(mutex);
const int32_t lsn_relofs = offset / CDIO_CD_FRAMESIZE_RAW;
if (lsn_relofs != buffer_lsn) {
const ScopeUnlock unlock(mutex);
try {
rbuf = para.Read().data;
} catch (...) {
char *s_err = cdio_cddap_errors(drv);
if (s_err) {
FmtError(cdio_domain,
"paranoia_read: {}", s_err);
cdio_cddap_free_messages(s_err);
}
throw;
try {
rbuf = para.Read().data;
} catch (...) {
char *s_err = cdio_cddap_errors(drv);
if (s_err) {
FmtError(cdio_domain,
"paranoia_read: {}", s_err);
cdio_cddap_free_messages(s_err);
}
//store current buffer
memcpy(buffer, rbuf, CDIO_CD_FRAMESIZE_RAW);
buffer_lsn = lsn_relofs;
} else {
//use cached sector
rbuf = (const int16_t *)buffer;
throw;
}
//correct offset
const int diff = offset - lsn_relofs * CDIO_CD_FRAMESIZE_RAW;
assert(diff >= 0 && diff < CDIO_CD_FRAMESIZE_RAW);
const size_t maxwrite = CDIO_CD_FRAMESIZE_RAW - diff; //# of bytes pending in current buffer
const size_t len = std::min(length, maxwrite);
//skip diff bytes from this lsn
memcpy(wptr, ((const char *)rbuf) + diff, len);
//update pointer
wptr += len;
nbytes += len;
//update offset
offset += len;
//update length
length -= len;
//store current buffer
memcpy(buffer, rbuf, CDIO_CD_FRAMESIZE_RAW);
buffer_lsn = lsn_relofs;
} else {
//use cached sector
rbuf = (const int16_t *)buffer;
}
//correct offset
const int diff = offset - lsn_relofs * CDIO_CD_FRAMESIZE_RAW;
assert(diff >= 0 && diff < CDIO_CD_FRAMESIZE_RAW);
const size_t maxwrite = CDIO_CD_FRAMESIZE_RAW - diff; //# of bytes pending in current buffer
const std::size_t nbytes = std::min(length, maxwrite);
//skip diff bytes from this lsn
memcpy(ptr, ((const char *)rbuf) + diff, nbytes);
//update offset
offset += nbytes;
return nbytes;
}