mirror of
https://gitlab.com/mbunkus/mkvtoolnix.git
synced 2024-12-25 04:11:44 +00:00
145 lines
3.6 KiB
C++
145 lines
3.6 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: r_mp3.cpp,v 1.9 2003/04/13 15:23:03 mosu Exp $
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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 "common.h"
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#include "error.h"
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#include "queue.h"
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#include "r_mp3.h"
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#include "p_mp3.h"
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#ifdef DMALLOC
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#include <dmalloc.h>
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#endif
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int mp3_reader_c::probe_file(FILE *file, 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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if (fseek(file, 0, SEEK_SET) != 0)
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return 0;
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if (fread(buf, 1, 4096, file) != 4096) {
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fseek(file, 0, SEEK_SET);
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return 0;
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}
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fseek(file, 0, SEEK_SET);
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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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if ((file = fopen(ti->fname, "r")) == NULL)
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throw error_c("mp3_reader: Could not open source file.");
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if (fseek(file, 0, SEEK_END) != 0)
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throw error_c("mp3_reader: Could not seek to end of file.");
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size = ftell(file);
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if (fseek(file, 0, SEEK_SET) != 0)
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throw error_c("mp3_reader: Could not seek to beginning of file.");
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chunk = (unsigned char *)malloc(4096);
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if (chunk == NULL)
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die("malloc");
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if (fread(chunk, 1, 4096, file) != 4096)
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throw error_c("mp3_reader: Could not read 4096 bytes.");
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if (fseek(file, 0, SEEK_SET) != 0)
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throw error_c("mp3_reader: Could not seek to beginning of file.");
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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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mp3packetizer = new mp3_packetizer_c(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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if (file != NULL)
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fclose(file);
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if (chunk != NULL)
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free(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, last_frame;
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do {
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if (mp3packetizer->packet_available())
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return EMOREDATA;
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nread = fread(chunk, 1, 4096, file);
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if (nread <= 0)
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return 0;
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last_frame = (nread == 4096 ? 0 : 1);
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mp3packetizer->process(chunk, nread, last_frame);
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bytes_processed += nread;
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if (last_frame)
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return 0;
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} while (1);
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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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