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/*
* skeleton.c
* author: Tahseen Mohammad
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ogg/ogg.h>
#include "skeleton.h"
/* write an ogg_page to a file pointer */
int write_ogg_page_to_file(ogg_page *og, FILE *out) {
int written;
written = fwrite(og->header,1, og->header_len, out);
written += fwrite(og->body,1, og->body_len, out);
return written;
}
int add_message_header_field(fisbone_packet *fp,
char *header_key,
char *header_value) {
/* size of both key and value + ': ' + CRLF */
int this_message_size = strlen(header_key) + strlen(header_value) + 4;
if (fp->message_header_fields == NULL) {
fp->message_header_fields = _ogg_calloc(this_message_size, sizeof(char));
} else {
int new_size = (fp->current_header_size + this_message_size) * sizeof(char);
fp->message_header_fields = _ogg_realloc(fp->message_header_fields, new_size);
}
snprintf(fp->message_header_fields + fp->current_header_size,
this_message_size+1,
"%s: %s\r\n",
header_key,
header_value);
fp->current_header_size += this_message_size;
return 0;
}
/* create a ogg_packet from a fishead_packet structure */
ogg_packet ogg_from_fishead(fishead_packet *fp) {
ogg_packet op;
memset(&op, 0, sizeof(op));
op.packet = _ogg_calloc(FISHEAD_SIZE, sizeof(unsigned char));
memset(op.packet, 0, FISHEAD_SIZE);
memcpy (op.packet, FISHEAD_IDENTIFIER, 8); /* identifier */
*((ogg_uint16_t*)(op.packet+8)) = SKELETON_VERSION_MAJOR; /* version major */
*((ogg_uint16_t*)(op.packet+10)) = SKELETON_VERSION_MINOR; /* version minor */
*((ogg_int64_t*)(op.packet+12)) = (ogg_int64_t)fp->ptime_n; /* presentationtime numerator */
*((ogg_int64_t*)(op.packet+20)) = (ogg_int64_t)fp->ptime_d; /* presentationtime denominator */
*((ogg_int64_t*)(op.packet+28)) = (ogg_int64_t)fp->btime_n; /* basetime numerator */
*((ogg_int64_t*)(op.packet+36)) = (ogg_int64_t)fp->btime_d; /* basetime denominator */
/* TODO: UTC time, set to zero for now */
op.b_o_s = 1; /* its the first packet of the stream */
op.e_o_s = 0; /* its not the last packet of the stream */
op.bytes = FISHEAD_SIZE; /* length of the packet in bytes */
return op;
}
/* create a ogg_packet from a fisbone_packet structure.
* call this method after the fisbone_packet is filled and all message header fields are added
* by calling add_message_header_field method.
*/
ogg_packet ogg_from_fisbone(fisbone_packet *fp) {
ogg_packet op;
int packet_size = FISBONE_SIZE + fp->current_header_size;
memset (&op, 0, sizeof (op));
op.packet = _ogg_calloc (packet_size, sizeof(unsigned char));
memset (op.packet, 0, packet_size);
memcpy (op.packet, FISBONE_IDENTIFIER, 8); /* identifier */
*((ogg_uint32_t*)(op.packet+8)) = FISBONE_MESSAGE_HEADER_OFFSET; /* offset of the message header fields */
*((ogg_uint32_t*)(op.packet+12)) = fp->serial_no; /* serialno of the respective stream */
*((ogg_uint32_t*)(op.packet+16)) = fp->nr_header_packet; /* number of header packets */
*((ogg_int64_t*)(op.packet+20)) = fp->granule_rate_n; /* granulrate numerator */
*((ogg_int64_t*)(op.packet+28)) = fp->granule_rate_d; /* granulrate denominator */
*((ogg_int64_t*)(op.packet+36)) = fp->start_granule; /* start granule */
*((ogg_uint32_t*)(op.packet+44)) = fp->preroll; /* preroll, for theora its 0 */
*(op.packet+48) = fp->granule_shift; /* granule shift */
memcpy((op.packet+FISBONE_SIZE), fp->message_header_fields, fp->current_header_size);
op.b_o_s = 0;
op.e_o_s = 0;
op.bytes = packet_size; /* size of the packet in bytes */
return op;
}
/* fills up a fishead_packet from a fishead ogg_packet of a skeleton bistream */
fishead_packet fishead_from_ogg(ogg_packet *op) {
fishead_packet fp;
if (memcmp(op->packet, FISHEAD_IDENTIFIER, 8))
; /* invalid packet what do we do? */
fp.version_major = *((ogg_uint16_t*)(op->packet+8)); /* version major */
fp.version_minor = *((ogg_uint16_t*)(op->packet+10)); /* version minor */
fp.ptime_n = *((ogg_int64_t*)(op->packet+12)); /* presentationtime numerator */
fp.ptime_d = *((ogg_int64_t*)(op->packet+20)); /* presentationtime denominator */
fp.btime_n = *((ogg_int64_t*)(op->packet+28)); /* basetime numerator */
fp.btime_d = *((ogg_int64_t*)(op->packet+36)); /* basetime denominator */
memcpy(fp.UTC, op->packet+44, 20);
return fp;
}
/* fills up a fisbone_packet from a fisbone ogg_packet of a skeleton bitstream */
fisbone_packet fisbone_from_ogg(ogg_packet *op) {
fisbone_packet fp;
if (memcmp(op->packet, FISBONE_IDENTIFIER, 8))
; /* invalid value, what do we do? */
fp.serial_no = *((ogg_uint32_t*)(op->packet+12)); /* serialno of the stream represented by this fisbone packet */
fp.nr_header_packet = *((ogg_uint32_t*)(op->packet+16)); /* number of header packets */
fp.granule_rate_n = *((ogg_int64_t*)(op->packet+20)); /* granulrate numerator */
fp.granule_rate_d = *((ogg_int64_t*)(op->packet+28)); /* granulrate denominator */
fp.start_granule = *((ogg_int64_t*)(op->packet+36)); /* start granule */
fp.preroll = *((ogg_uint32_t*)(op->packet+44)); /* preroll, for theora its 0 */
fp.granule_shift = *(op->packet+48); /* granule shift */
fp.current_header_size = op->bytes - FISBONE_SIZE;
fp.message_header_fields = _ogg_calloc(fp.current_header_size+1, sizeof(char));
memcpy(fp.message_header_fields, op->packet+FISBONE_SIZE, fp.current_header_size);
return fp;
}
int add_fishead_to_stream(ogg_stream_state *os, fishead_packet *fp) {
ogg_packet op;
op = ogg_from_fishead(fp);
ogg_stream_packetin(os, &op);
_ogg_free(op.packet);
return 0;
}
int add_fisbone_to_stream(ogg_stream_state *os, fisbone_packet *fp) {
ogg_packet op;
op = ogg_from_fisbone(fp);
ogg_stream_packetin(os, &op);
_ogg_free(op.packet);
return 0;
}
int add_eos_packet_to_stream(ogg_stream_state *os) {
ogg_packet op;
memset (&op, 0, sizeof(op));
op.e_o_s = 1;
ogg_stream_packetin(os, &op);
return 0;
}
int flush_ogg_stream_to_file(ogg_stream_state *os, FILE *out) {
ogg_page og;
int result;
while((result = ogg_stream_flush(os, &og)))
{
if(!result) break;
result = write_ogg_page_to_file(&og, out);
if(result != og.header_len + og.body_len)
return 1;
}
return 0;
}
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