mirror of
https://gitlab.com/mbunkus/mkvtoolnix.git
synced 2024-12-25 20:32:33 +00:00
143 lines
3.4 KiB
C++
143 lines
3.4 KiB
C++
/*
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mkvmerge -- utility for splicing together matroska files
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from component media subtypes
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r_mp3.h
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Written by Moritz Bunkus <moritz@bunkus.org>
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Distributed under the GPL
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see the file COPYING for details
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or visit http://www.gnu.org/copyleft/gpl.html
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*/
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/*!
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\file
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\version $Id$
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\brief MP3 reader module
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\author Moritz Bunkus <moritz@bunkus.org>
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "mkvmerge.h"
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#include "common.h"
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#include "error.h"
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#include "r_mp3.h"
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#include "p_mp3.h"
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int mp3_reader_c::probe_file(mm_io_c *mm_io, int64_t size) {
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unsigned char buf[4096];
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int pos;
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unsigned long header;
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mp3_header_t mp3header;
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if (size < 4096)
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return 0;
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try {
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mm_io->setFilePointer(0, seek_beginning);
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if (mm_io->read(buf, 4096) != 4096)
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return 0;
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mm_io->setFilePointer(0, seek_beginning);
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} catch (exception &ex) {
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return 0;
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}
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pos = find_mp3_header(buf, 4096, &header);
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if (pos != 0)
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return 0;
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decode_mp3_header(header, &mp3header);
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if ((4 - ((header >> 17) & 3)) != 3)
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return 0;
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pos = find_mp3_header(&buf[pos + mp3header.framesize + 4], 4096 - pos - 4 -
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mp3header.framesize, &header);
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if (pos < 0)
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return 0;
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if ((4 - ((header >> 17) & 3)) != 3)
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return 0;
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return 1;
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}
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mp3_reader_c::mp3_reader_c(track_info_t *nti) throw (error_c):
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generic_reader_c(nti) {
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int pos;
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unsigned long header;
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mp3_header_t mp3header;
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try {
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mm_io = new mm_io_c(ti->fname, MODE_READ);
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mm_io->setFilePointer(0, seek_end);
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size = mm_io->getFilePointer();
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mm_io->setFilePointer(0, seek_beginning);
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chunk = (unsigned char *)safemalloc(4096);
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if (mm_io->read(chunk, 4096) != 4096)
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throw error_c("mp3_reader: Could not read 4096 bytes.");
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mm_io->setFilePointer(0, seek_beginning);
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} catch (exception &ex) {
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throw error_c("mp3_reader: Could not open the source file.");
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}
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pos = find_mp3_header(chunk, 4096, &header);
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if (pos < 0)
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throw error_c("mp3_reader: No valid MP3 packet found in the first "
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"4096 bytes.\n");
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decode_mp3_header(header, &mp3header);
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bytes_processed = 0;
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ti->id = 0; // ID for this track.
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mp3packetizer = new mp3_packetizer_c(this,
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mp3_freqs[mp3header.sampling_frequency],
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mp3header.stereo ? 2 : 1, ti);
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if (verbose)
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fprintf(stdout, "Using MP3 demultiplexer for %s.\n+-> Using "
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"MP3 output module for audio stream.\n", ti->fname);
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}
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mp3_reader_c::~mp3_reader_c() {
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delete mm_io;
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if (chunk != NULL)
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safefree(chunk);
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if (mp3packetizer != NULL)
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delete mp3packetizer;
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}
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int mp3_reader_c::read() {
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int nread;
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nread = mm_io->read(chunk, 4096);
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if (nread <= 0)
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return 0;
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mp3packetizer->process(chunk, nread);
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bytes_processed += nread;
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return EMOREDATA;
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}
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packet_t *mp3_reader_c::get_packet() {
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return mp3packetizer->get_packet();
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}
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int mp3_reader_c::display_priority() {
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return DISPLAYPRIORITY_HIGH - 1;
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}
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void mp3_reader_c::display_progress() {
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fprintf(stdout, "progress: %lld/%lld bytes (%d%%)\r",
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bytes_processed, size,
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(int)(bytes_processed * 100L / size));
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fflush(stdout);
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}
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void mp3_reader_c::set_headers() {
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mp3packetizer->set_headers();
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}
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void mp3_reader_c::identify() {
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fprintf(stdout, "File '%s': container: MP3\nTrack ID 0: audio (MP3)\n",
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ti->fname);
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}
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