mirror of
https://gitlab.com/mbunkus/mkvtoolnix.git
synced 2024-12-24 11:54:01 +00:00
224 lines
6.0 KiB
C++
224 lines
6.0 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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p_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: p_mp3.cpp,v 1.1 2003/02/16 17:04:38 mosu Exp $
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\brief MP3 output 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 "queue.h"
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#include "mp3_common.h"
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#include "p_mp3.h"
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#include "KaxTracks.h"
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#include "KaxTrackAudio.h"
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#ifdef DMALLOC
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#include <dmalloc.h>
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#endif
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mp3_packetizer_c::mp3_packetizer_c(unsigned long nsamples_per_sec,
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int nchannels, int nmp3rate,
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audio_sync_t *nasync, range_t *nrange)
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throw (error_c) : q_c() {
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samples_per_sec = nsamples_per_sec;
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channels = nchannels;
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mp3rate = nmp3rate;
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bytes_output = 0;
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memcpy(&async, nasync, sizeof(audio_sync_t));
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memcpy(&range, nrange, sizeof(range_t));
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packet_buffer = NULL;
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buffer_size = 0;
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packetno = 0;
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set_header();
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}
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mp3_packetizer_c::~mp3_packetizer_c() {
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if (packet_buffer != NULL)
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free(packet_buffer);
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}
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void mp3_packetizer_c::add_to_buffer(char *buf, int size) {
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char *new_buffer;
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new_buffer = (char *)realloc(packet_buffer, buffer_size + size);
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if (new_buffer == NULL)
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die("realloc");
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memcpy(new_buffer + buffer_size, buf, size);
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packet_buffer = new_buffer;
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buffer_size += size;
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}
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int mp3_packetizer_c::mp3_packet_available() {
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unsigned long header;
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int pos;
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mp3_header_t mp3header;
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if (packet_buffer == NULL)
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return 0;
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pos = find_mp3_header(packet_buffer, buffer_size, &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 ((pos + mp3header.framesize + 4) > buffer_size)
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return 0;
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return 1;
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}
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void mp3_packetizer_c::remove_mp3_packet(int pos, int framesize) {
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int new_size;
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char *temp_buf;
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new_size = buffer_size - (pos + framesize + 4) + 1;
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temp_buf = (char *)malloc(new_size);
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if (temp_buf == NULL)
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die("malloc");
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if (new_size != 0)
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memcpy(temp_buf, &packet_buffer[pos + framesize + 4 - 1], new_size);
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free(packet_buffer);
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packet_buffer = temp_buf;
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buffer_size = new_size;
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}
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char *mp3_packetizer_c::get_mp3_packet(unsigned long *header,
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mp3_header_t *mp3header) {
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int pos;
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char *buf;
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double pims;
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if (packet_buffer == NULL)
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return 0;
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pos = find_mp3_header(packet_buffer, buffer_size, 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 ((pos + mp3header->framesize + 4) > buffer_size)
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return 0;
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pims = 1000.0 * 1152.0 / mp3_freqs[mp3header->sampling_frequency];
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if (async.displacement < 0) {
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/*
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* MP3 audio synchronization. displacement < 0 means skipping an
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* appropriate number of packets at the beginning.
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*/
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async.displacement += (int)pims;
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if (async.displacement > -(pims / 2))
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async.displacement = 0;
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remove_mp3_packet(pos, mp3header->framesize);
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return 0;
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}
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if ((verbose > 1) && (pos > 1))
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fprintf(stdout, "mp3_packetizer: skipping %d bytes (no valid MP3 header "
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"found).\n", pos);
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buf = (char *)malloc(mp3header->framesize + 4);
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if (buf == NULL)
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die("malloc");
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memcpy(buf, packet_buffer + pos, mp3header->framesize + 4);
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if (async.displacement > 0) {
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/*
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* MP3 audio synchronization. displacement > 0 is solved by creating
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* silent MP3 packets and repeating it over and over again (well only as
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* often as necessary of course. Wouldn't want to spoil your movie by
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* providing a silent MP3 stream ;)).
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*/
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async.displacement -= (int)pims;
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if (async.displacement < (pims / 2))
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async.displacement = 0;
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memset(buf + 4, 0, mp3header->framesize);
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return buf;
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}
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remove_mp3_packet(pos, mp3header->framesize);
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return buf;
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}
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void mp3_packetizer_c::set_header() {
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using namespace LIBMATROSKA_NAMESPACE;
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if (kax_last_entry == NULL)
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track_entry =
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&GetChild<KaxTrackEntry>(static_cast<KaxTracks &>(*kax_tracks));
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else
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track_entry =
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&GetNextChild<KaxTrackEntry>(static_cast<KaxTracks &>(*kax_tracks),
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static_cast<KaxTrackEntry &>(*kax_last_entry));
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kax_last_entry = track_entry;
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serialno = track_number++;
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KaxTrackNumber &tnumber =
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GetChild<KaxTrackNumber>(static_cast<KaxTrackEntry &>(*track_entry));
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*(static_cast<EbmlUInteger *>(&tnumber)) = serialno;
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*(static_cast<EbmlUInteger *>
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(&GetChild<KaxTrackType>(static_cast<KaxTrackEntry &>(*track_entry)))) =
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track_audio;
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KaxCodecID &codec_id =
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GetChild<KaxCodecID>(static_cast<KaxTrackEntry &>(*track_entry));
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codec_id.CopyBuffer((binary *)"A_MPEGLAYER3", countof("A_MPEGLAYER3"));
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KaxTrackAudio &track_audio =
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GetChild<KaxTrackAudio>(static_cast<KaxTrackEntry &>(*track_entry));
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KaxAudioSamplingFreq &kax_freq = GetChild<KaxAudioSamplingFreq>(track_audio);
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*(static_cast<EbmlFloat *>(&kax_freq)) = (float)samples_per_sec;
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KaxAudioChannels &kax_chans = GetChild<KaxAudioChannels>(track_audio);
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*(static_cast<EbmlUInteger *>(&kax_chans)) = channels;
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}
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int mp3_packetizer_c::process(char *buf, int size, int last_frame) {
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char *packet;
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unsigned long header;
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mp3_header_t mp3header;
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if (packetno == 0)
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set_header();
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add_to_buffer(buf, size);
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while ((packet = get_mp3_packet(&header, &mp3header)) != NULL) {
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if ((4 - ((header >> 17) & 3)) != 3) {
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fprintf(stdout, "Warning: p_mp3: packet is not a valid MP3 packet (" \
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"packet number %lld)\n", packetno - 2);
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return EMOREDATA;
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}
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add_packet(packet, mp3header.framesize + 4,
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(u_int64_t)(1000.0 * packetno * 1152 * async.linear /
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samples_per_sec));
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packetno++;
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free(packet);
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}
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if (last_frame)
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return 0;
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else
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return EMOREDATA;
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}
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