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-rw-r--r--src/skeleton.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/src/skeleton.c b/src/skeleton.c
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+/*
+ * skeleton.c
+ * author: Tahseen Mohammad
+ */
+
+/* This file depends on WORDS_BIGENDIAN being defined to 1 if the host
+ * processor stores words with the most significant byte first (like Motorola
+ * and SPARC, unlike Intel and VAX).
+ * On little endian systems, WORDS_BIGENDIAN should be undefined.
+ *
+ * When using GNU Autotools, the correct value will be written into config.h
+ * if the autoconf macro AC_C_BIGENDIAN is called in configure.ac.
+ */
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <ogg/ogg.h>
+
+#include "skeleton.h"
+
+#ifdef WIN32
+#define snprintf _snprintf
+#endif
+
+static unsigned short
+_le_16 (unsigned short s)
+{
+ unsigned short ret=s;
+#ifdef WORDS_BIGENDIAN
+ ret = (s>>8) & 0x00ffU;
+ ret += (s<<8) & 0xff00U;
+#endif
+ return ret;
+}
+
+static ogg_uint32_t
+_le_32 (ogg_uint32_t i)
+{
+ ogg_uint32_t ret=i;
+#ifdef WORDS_BIGENDIAN
+ ret = (i>>24);
+ ret += (i>>8) & 0x0000ff00;
+ ret += (i<<8) & 0x00ff0000;
+ ret += (i<<24);
+#endif
+ return ret;
+}
+
+static ogg_int64_t
+_le_64 (ogg_int64_t l)
+{
+ ogg_int64_t ret=l;
+ unsigned char *ucptr = (unsigned char *)&ret;
+#ifdef WORDS_BIGENDIAN
+ unsigned char temp;
+
+ temp = ucptr [0] ;
+ ucptr [0] = ucptr [7] ;
+ ucptr [7] = temp ;
+
+ temp = ucptr [1] ;
+ ucptr [1] = ucptr [6] ;
+ ucptr [6] = temp ;
+
+ temp = ucptr [2] ;
+ ucptr [2] = ucptr [5] ;
+ ucptr [5] = temp ;
+
+ temp = ucptr [3] ;
+ ucptr [3] = ucptr [4] ;
+ ucptr [4] = temp ;
+
+#endif
+ return (*(ogg_int64_t *)ucptr);
+}
+
+/* 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);
+ if (written > 0)
+ 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+1, sizeof(char));
+ } else {
+ int new_size = (fp->current_header_size + this_message_size+1) * 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 */
+int ogg_from_fishead(fishead_packet *fp,ogg_packet *op) {
+
+ if (!fp || !op) return -1;
+
+ memset(op, 0, sizeof(*op));
+ op->packet = _ogg_calloc(FISHEAD_SIZE, sizeof(unsigned char));
+ if (!op->packet) return -1;
+
+ memset(op->packet, 0, FISHEAD_SIZE);
+
+ memcpy (op->packet, FISHEAD_IDENTIFIER, 8); /* identifier */
+ *((ogg_uint16_t*)(op->packet+8)) = _le_16 (SKELETON_VERSION_MAJOR); /* version major */
+ *((ogg_uint16_t*)(op->packet+10)) = _le_16 (SKELETON_VERSION_MINOR); /* version minor */
+ *((ogg_int64_t*)(op->packet+12)) = _le_64 (fp->ptime_n); /* presentationtime numerator */
+ *((ogg_int64_t*)(op->packet+20)) = _le_64 (fp->ptime_d); /* presentationtime denominator */
+ *((ogg_int64_t*)(op->packet+28)) = _le_64 (fp->btime_n); /* basetime numerator */
+ *((ogg_int64_t*)(op->packet+36)) = _le_64 (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 0;
+}
+
+/* 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.
+ */
+int ogg_from_fisbone(fisbone_packet *fp,ogg_packet *op) {
+
+ int packet_size;
+
+ if (!fp || !op) return -1;
+
+ packet_size = FISBONE_SIZE + fp->current_header_size;
+
+ memset (op, 0, sizeof (*op));
+ op->packet = _ogg_calloc (packet_size, sizeof(unsigned char));
+ if (!op->packet) return -1;
+
+ memset (op->packet, 0, packet_size);
+ memcpy (op->packet, FISBONE_IDENTIFIER, 8); /* identifier */
+ *((ogg_uint32_t*)(op->packet+8)) = _le_32 (FISBONE_MESSAGE_HEADER_OFFSET); /* offset of the message header fields */
+ *((ogg_uint32_t*)(op->packet+12)) = _le_32 (fp->serial_no); /* serialno of the respective stream */
+ *((ogg_uint32_t*)(op->packet+16)) = _le_32 (fp->nr_header_packet); /* number of header packets */
+ *((ogg_int64_t*)(op->packet+20)) = _le_64 (fp->granule_rate_n); /* granulrate numerator */
+ *((ogg_int64_t*)(op->packet+28)) = _le_64 (fp->granule_rate_d); /* granulrate denominator */
+ *((ogg_int64_t*)(op->packet+36)) = _le_64 (fp->start_granule); /* start granule */
+ *((ogg_uint32_t*)(op->packet+44)) = _le_32 (fp->preroll); /* preroll, for theora its 0 */
+ *(op->packet+48) = fp->granule_shift; /* granule shift */
+ if (fp->message_header_fields)
+ 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 0;
+}
+
+/* fills up a fishead_packet from memory */
+static int fishead_from_data (const unsigned char * data, int len, fishead_packet *fp) {
+ if (!data) return -1;
+
+ if (memcmp(data, FISHEAD_IDENTIFIER, 8))
+ return -1;
+
+ fp->version_major = _le_16 (*((ogg_uint16_t*)(data+8))); /* version major */
+ fp->version_minor = _le_16 (*((ogg_uint16_t*)(data+10))); /* version minor */
+ fp->ptime_n = _le_64 (*((ogg_int64_t*)(data+12))); /* presentationtime numerator */
+ fp->ptime_d = _le_64 (*((ogg_int64_t*)(data+20))); /* presentationtime denominator */
+ fp->btime_n = _le_64 (*((ogg_int64_t*)(data+28))); /* basetime numerator */
+ fp->btime_d = _le_64 (*((ogg_int64_t*)(data+36))); /* basetime denominator */
+ memcpy(fp->UTC, data+44, 20);
+
+ return 0;
+}
+
+/* fills up a fishead_packet from a fishead ogg_packet of a skeleton bistream */
+int fishead_from_ogg (ogg_packet *op, fishead_packet *fp) {
+ return fishead_from_data (op->packet, op->bytes, fp);
+}
+
+/* fills up a fishead_packet from a fishead ogg_page of a skeleton bistream */
+int fishead_from_ogg_page (const ogg_page *og, fishead_packet *fp) {
+ return fishead_from_data (og->body, og->body_len, fp);
+}
+
+/* fills up a fisbone_packet from memory */
+static int fisbone_from_data (const unsigned char * data, int len, fisbone_packet *fp) {
+
+ if (!fp) return -1;
+
+ if (memcmp(data, FISBONE_IDENTIFIER, 8))
+ return -1;
+
+ fp->serial_no = _le_32 (*((ogg_uint32_t*)(data+12))); /* serialno of the stream represented by this fisbone packet */
+ fp->nr_header_packet = _le_32 (*((ogg_uint32_t*)(data+16))); /* number of header packets */
+ fp->granule_rate_n = _le_64 (*((ogg_int64_t*)(data+20))); /* granulrate numerator */
+ fp->granule_rate_d = _le_64 (*((ogg_int64_t*)(data+28))); /* granulrate denominator */
+ fp->start_granule = _le_64 (*((ogg_int64_t*)(data+36))); /* start granule */
+ fp->preroll = _le_32 (*((ogg_uint32_t*)(data+44))); /* preroll, for theora its 0 */
+ fp->granule_shift = *(data+48); /* granule shift */
+ fp->current_header_size = len - FISBONE_SIZE;
+ fp->message_header_fields = _ogg_calloc(fp->current_header_size+1, sizeof(char));
+ if (!fp->message_header_fields) return -1;
+ memcpy(fp->message_header_fields, data+FISBONE_SIZE, fp->current_header_size);
+
+ return 0;
+}
+
+/* fills up a fisbone_packet from a fisbone ogg_packet of a skeleton bitstream */
+int fisbone_from_ogg (ogg_packet *op, fisbone_packet *fp) {
+ return fisbone_from_data (op->packet, op->bytes, fp);
+}
+
+/* fills up a fisbone_packet from a fisbone ogg_page of a skeleton bistream */
+int fisbone_from_ogg_page (const ogg_page *og, fisbone_packet *fp) {
+ return fisbone_from_data (og->body, og->body_len, fp);
+}
+
+int fisbone_clear(fisbone_packet *fp)
+{
+ if (!fp) return -1;
+ _ogg_free(fp->message_header_fields);
+ return 0;
+}
+
+int add_fishead_to_stream(ogg_stream_state *os, fishead_packet *fp) {
+
+ ogg_packet op;
+ int ret;
+
+ ret = ogg_from_fishead(fp, &op);
+ if (ret<0) return ret;
+ 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;
+ int ret;
+
+ ret = ogg_from_fisbone(fp, &op);
+ if (ret<0) return ret;
+ 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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