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/*
ogmmerge -- utility for splicing together ogg bitstreams
from component media subtypes
p_pcm.cpp
raw & uncompressed PCM output module
Written by Moritz Bunkus <moritz@bunkus.org>
Based on Xiph.org's 'oggmerge' found in their CVS repository
See http://www.xiph.org
Distributed under the GPL
see the file COPYING for details
or visit http://www.gnu.org/copyleft/gpl.html
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ogg/ogg.h>
#include "ogmmerge.h"
#include "queue.h"
#include "p_pcm.h"
#include "vorbis_header_utils.h"
pcm_packetizer_c::pcm_packetizer_c(unsigned long nsamples_per_sec,
int nchannels, int nbits_per_sample,
audio_sync_t *nasync, range_t *nrange,
char **ncomments) throw (error_c) : q_c() {
serialno = create_unique_serial();
ogg_stream_init(&os, serialno);
packetno = 0;
bps = nchannels * nbits_per_sample * nsamples_per_sec / 8;
tempbuf = (char *)malloc(bps + 128);
if (tempbuf == NULL)
die("malloc");
samples_per_sec = nsamples_per_sec;
channels = nchannels;
bits_per_sample = nbits_per_sample;
bytes_output = 0;
memcpy(&async, nasync, sizeof(audio_sync_t));
memcpy(&range, nrange, sizeof(range_t));
comments = generate_vorbis_comment(ncomments);
old_granulepos = 0;
}
pcm_packetizer_c::~pcm_packetizer_c() {
ogg_stream_clear(&os);
if (tempbuf != NULL)
free(tempbuf);
if (comments != NULL) {
vorbis_comment_clear(comments);
free(comments);
}
}
void pcm_packetizer_c::reset() {
}
void pcm_packetizer_c::produce_header_packets() {
ogg_packet op;
stream_header sh;
int clen, res;
memset(&sh, 0, sizeof(sh));
strcpy(sh.streamtype, "audio");
memcpy(sh.subtype, "0001", 4);
put_uint32(&sh.size, sizeof(sh));
put_uint64(&sh.time_unit, 10000000);
put_uint64(&sh.samples_per_unit, samples_per_sec);
put_uint32(&sh.default_len, 1);
put_uint32(&sh.buffersize, bps);
put_uint16(&sh.bits_per_sample, bits_per_sample);
put_uint16(&sh.sh.audio.channels, channels);
put_uint16(&sh.sh.audio.blockalign, channels * bits_per_sample / 8);
put_uint32(&sh.sh.audio.avgbytespersec, sh.buffersize);
*((unsigned char *)tempbuf) = PACKET_TYPE_HEADER;
memcpy((char *)&tempbuf[1], &sh, sizeof(sh));
op.packet = (unsigned char *)tempbuf;
op.bytes = 1 + get_uint32(&sh.size);
op.b_o_s = 1;
op.e_o_s = 0;
op.packetno = 0;
op.granulepos = 0;
/* submit it */
ogg_stream_packetin(&os, &op);
packetno++;
flush_pages(PACKET_TYPE_HEADER);
/* Create the comments packet */
clen = -1 * comments_to_buffer(comments, NULL, 0);
op.packet = (unsigned char *)tempbuf;
op.bytes = clen;
op.b_o_s = 0;
op.e_o_s = 0;
op.granulepos = 0;
op.packetno = 1;
if ((res = comments_to_buffer(comments, (char *)op.packet, clen)) < 0) {
fprintf(stderr, "FATAL: p_pcm: comments_to_buffer returned %d, " \
"clen is %d\n", res, clen);
exit(1);
}
ogg_stream_packetin(&os, &op);
flush_pages(PACKET_TYPE_COMMENT);
packetno++;
}
int pcm_packetizer_c::process(char *buf, int size, int last_frame) {
ogg_packet op;
int i;
int start, j;
u_int16_t samp_in_subpacket;
unsigned char *bptr;
int bytes_per_subpacket;
int remaining_bytes;
int complete_subpackets;
if (size > bps) {
fprintf(stderr, "FATAL: pcm_packetizer: size (%d) > bps (%d)\n", size,
bps);
exit(1);
}
if (packetno == 0)
produce_header_packets();
bytes_per_subpacket = bps / pcm_interleave;
complete_subpackets = size / bytes_per_subpacket;
remaining_bytes = size % bytes_per_subpacket;
memcpy(&tempbuf[1 + sizeof(samp_in_subpacket)], buf, size);
for (i = 0; i < complete_subpackets; i++) {
int last_packet = 0;
if (last_frame && (i == (complete_subpackets - 1)) &&
(remaining_bytes == 0))
last_packet = 1;
start = i * bytes_per_subpacket;
samp_in_subpacket = bytes_per_subpacket * 8 / bits_per_sample / channels;
tempbuf[start] = ((sizeof(samp_in_subpacket) & 3) << 6) +
((sizeof(samp_in_subpacket) & 4) >> 1);
tempbuf[start] |= (i == 0 ? PACKET_IS_SYNCPOINT : 0);
op.bytes = bytes_per_subpacket + 1 + sizeof(samp_in_subpacket);
bptr = (unsigned char *)&tempbuf[start + 1];
for (j = 0; j < sizeof(samp_in_subpacket); j++) {
*(bptr + j) = (unsigned char)(samp_in_subpacket & 0xFF);
samp_in_subpacket = samp_in_subpacket >> 8;
}
op.packet = (unsigned char *)&tempbuf[start];
op.b_o_s = 0;
op.e_o_s = last_packet;
op.granulepos = (u_int64_t)(bytes_output * 8 / bits_per_sample /
channels);
op.packetno = packetno++;
ogg_stream_packetin(&os, &op);
bytes_output += bytes_per_subpacket;
}
if (remaining_bytes) {
int last_packet = last_frame;
start = complete_subpackets * bytes_per_subpacket;
samp_in_subpacket = remaining_bytes * 8 / bits_per_sample / channels;
tempbuf[start] = ((sizeof(samp_in_subpacket) & 3) << 6) +
((sizeof(samp_in_subpacket) & 4) >> 1);
tempbuf[start] |= (i == 0 ? PACKET_IS_SYNCPOINT : 0);
op.bytes = remaining_bytes + 1 + sizeof(samp_in_subpacket);
bptr = (unsigned char *)&tempbuf[start + 1];
for (j = 0; j < sizeof(samp_in_subpacket); j++) {
*(bptr + j) = (unsigned char)(samp_in_subpacket & 0xFF);
samp_in_subpacket = samp_in_subpacket >> 8;
}
op.packet = (unsigned char *)&tempbuf[start];
op.b_o_s = 0;
op.e_o_s = last_packet;
op.granulepos = (u_int64_t)(bytes_output * 8 / bits_per_sample /
channels);
op.packetno = packetno++;
ogg_stream_packetin(&os, &op);
bytes_output += remaining_bytes;
}
if (last_frame)
flush_pages();
else
queue_pages();
return EMOREDATA;
}
void pcm_packetizer_c::produce_eos_packet() {
char buf = 0;
process(&buf, 1, 1);
}
stamp_t pcm_packetizer_c::make_timestamp(ogg_int64_t granulepos) {
stamp_t stamp;
#ifndef INCORRECT_INTERLEAVING
stamp = (stamp_t)((double)old_granulepos * 1000000.0 /
(double)samples_per_sec);
old_granulepos = granulepos;
#else
stamp = (stamp_t)((double)granulepos * 1000000.0 /
(double)samples_per_sec);
#endif
return stamp;
}
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