added include/skeleton.h src/skeleton.c.

implemented  the skeleton bitsream recommendation


git-svn-id: https://recordmydesktop.svn.sourceforge.net/svnroot/recordmydesktop/trunk@481 f606c939-3180-4ac9-a4b8-4b8779d57d0a

1 files changed, 216 insertions, 0 deletions

diff --git a/recordmydesktop/src/skeleton.c b/recordmydesktop/src/skeleton.c
new file mode 100644
index 0000000..02dd6bd
--- /dev/null
+++ b/recordmydesktop/src/skeleton.c
@@ -0,0 +1,216 @@
+/******************************************************************************
+*                                skeleton.c                                   *
+*                          author: Tahseen Mohammad                           *
+*******************************************************************************
+*   Redistribution and use in source and binary forms, with or without        *
+*   modification, are permitted provided that the following conditions        *
+*   are met:                                                                  *
+*                                                                             *
+*   - Redistributions of source code must retain the above copyright          *
+*   notice, this list of conditions and the following disclaimer.             *
+*                                                                             * 
+*   - Redistributions in binary form must reproduce the above copyright       *
+*   notice, this list of conditions and the following disclaimer in the       *
+*   documentation and/or other materials provided with the distribution.      *
+*                                                                             *
+*   - Neither the name of the Xiph.org Foundation nor the names of its        *
+*   contributors may be used to endorse or promote products derived from      *
+*   this software without specific prior written permission.                  *
+*                                                                             *
+*   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
+*   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT       *
+*   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR     *
+*   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR *
+*   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     *
+*   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
+*   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
+*   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
+*   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
+*   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+*   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+******************************************************************************/
+
+
+#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;
+}