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Move the page counting logic in the Ogg reader

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This commit is contained in:
Frédéric Mangano 2021-01-17 11:51:47 +01:00
parent 6758ae23ff
commit b8f2518ef5
3 changed files with 11 additions and 6 deletions
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10
src/cli.cc
View File

@ -357,16 +357,14 @@ static void process(ot::ogg_reader& reader, ot::ogg_writer* writer, const ot::op
{
bool focused = false; /*< the stream on which we operate is defined */
int focused_serialno; /*< when focused, the serialno of the focused stream */
int absolute_page_no = -1; /*< page number in the physical stream, not logical */
for (;;) {
ot::status rc = reader.next_page();
if (rc == ot::st::end_of_stream)
break;
else if (rc == ot::st::bad_stream && absolute_page_no == -1)
else if (rc == ot::st::bad_stream && reader.absolute_page_no == (size_t) -1)
throw ot::status {ot::st::bad_stream, "Input is not a valid Ogg file."};
else if (rc != ot::st::ok)
throw rc;
++absolute_page_no;
auto serialno = ogg_page_serialno(&reader.page);
auto pageno = ogg_page_pageno(&reader.page);
if (!focused) {
@ -376,7 +374,7 @@ static void process(ot::ogg_reader& reader, ot::ogg_writer* writer, const ot::op
/** \todo Support mixed streams. */
throw ot::status {ot::st::error, "Muxed streams are not supported yet."};
}
if (absolute_page_no == 0) { // Identification header
if (reader.absolute_page_no == 0) { // Identification header
if (!ot::is_opus_stream(reader.page))
throw ot::status {ot::st::error, "Not an Opus stream."};
if (writer) {
@ -384,7 +382,7 @@ static void process(ot::ogg_reader& reader, ot::ogg_writer* writer, const ot::op
if (rc != ot::st::ok)
throw rc;
}
} else if (absolute_page_no == 1) { // Comment header
} else if (reader.absolute_page_no == 1) { // Comment header
ot::opus_tags tags;
rc = reader.process_header_packet(
[&tags](ogg_packet& p) { return ot::parse_tags(p, tags); });
@ -409,7 +407,7 @@ static void process(ot::ogg_reader& reader, ot::ogg_writer* writer, const ot::op
throw rc;
}
}
if (absolute_page_no < 1)
if (reader.absolute_page_no < 1)
throw ot::status {ot::st::error, "Expected at least 2 Ogg pages."};
}

1
src/ogg.cc
View File

@ -46,6 +46,7 @@ ot::status ot::ogg_reader::next_page()
if (ogg_sync_wrote(&sync, len) != 0)
return {st::libogg_error, "ogg_sync_wrote failed."};
}
++absolute_page_no;
return st::ok;
}

6
src/opustags.h
View File

@ -258,6 +258,12 @@ struct ogg_reader {
* to ogg_sync_pageout, wrapped by #read_page.
*/
ogg_page page;
/**
* Page number in the physical stream of the last read page, disregarding multiplexed
* streams. The first page number is 0. When no page has been read, its value is
* (size_t) -1.
*/
size_t absolute_page_no = -1;
/**
* The file is our source of binary data. It is not integrated to libogg, so we need to
* handle it ourselves.