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-rw-r--r--gst/mpeg1sys/systems.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/gst/mpeg1sys/systems.c b/gst/mpeg1sys/systems.c
new file mode 100644
index 00000000..d0b3388a
--- /dev/null
+++ b/gst/mpeg1sys/systems.c
@@ -0,0 +1,290 @@
+#include <string.h>
+
+#include "main.h"
+
+static void buffer_timecode (timecode, marker, buffer)
+guint64 timecode;
+unsigned char marker;
+unsigned char **buffer;
+
+{
+ unsigned char temp;
+
+ temp = (marker << 4) | ((timecode>>29) & 0x38) |
+ ((timecode >> 29) & 0x6) | 1;
+ *((*buffer)++)=temp;
+ temp = (timecode & 0x3fc00000) >> 22;
+ *((*buffer)++)=temp;
+ temp = ((timecode & 0x003f8000) >> 14) | 1;
+ *((*buffer)++)=temp;
+ temp = (timecode & 0x7f80) >> 7;
+ *((*buffer)++)=temp;
+ temp = ((timecode & 0x007f) << 1) | 1;
+ *((*buffer)++)=temp;
+}
+
+/*************************************************************************
+ creates a complete sector.
+ Also copies Pack and Sys_Header informations into the
+ sector buffer, then reads a packet full of data from
+ the input stream into the sector buffer.
+*************************************************************************/
+
+
+void create_sector (sector, pack, sys_header,
+ packet_size, inputbuffer, type,
+ buffer_scale, buffer_size, buffers,
+ PTS, DTS, timestamps, which_streams )
+
+Sector_struc *sector;
+Pack_struc *pack;
+Sys_header_struc *sys_header;
+unsigned int packet_size;
+unsigned char *inputbuffer;
+
+unsigned char type;
+unsigned char buffer_scale;
+unsigned int buffer_size;
+unsigned char buffers;
+guint64 PTS;
+guint64 DTS;
+unsigned char timestamps;
+unsigned int which_streams;
+
+{
+ int i,j,tmp;
+ unsigned char *index;
+ unsigned char *size_offset;
+
+ /* printf("creating sector\n"); */
+
+ index = sector->buf;
+ sector->length_of_sector=0;
+
+/* Should we copy Pack Header information ? */
+
+ if (pack != NULL)
+ {
+ i = sizeof(pack->buf);
+ bcopy (pack->buf, index, i);
+ index += i;
+ sector->length_of_sector += i;
+ }
+
+/* Should we copy System Header information ? */
+
+ if (sys_header != NULL)
+ {
+ i = sizeof(sys_header->buf);
+
+ /* only one stream? 3 bytes less in sys header */
+ if (which_streams != STREAMS_BOTH) i -= 3;
+
+ bcopy (sys_header->buf, index, i);
+ index += i;
+ sector->length_of_sector += i;
+ }
+
+ /* write constant packet header data */
+
+ *(index++) = (unsigned char)(PACKET_START)>>16;
+ *(index++) = (unsigned char)(PACKET_START & 0x00ffff)>>8;
+ *(index++) = (unsigned char)(PACKET_START & 0x0000ff);
+ *(index++) = type;
+
+ /* we remember this offset in case we will have to shrink this packet */
+
+ size_offset = index;
+ *(index++) = (unsigned char)((packet_size - PACKET_HEADER_SIZE)>>8);
+ *(index++) = (unsigned char)((packet_size - PACKET_HEADER_SIZE)&0xff);
+
+ *(index++) = STUFFING_BYTE;
+ *(index++) = STUFFING_BYTE;
+ *(index++) = STUFFING_BYTE;
+
+ i = 0;
+
+ if (!buffers) i +=2;
+ if (timestamps == TIMESTAMPS_NO) i+=9;
+ else if (timestamps == TIMESTAMPS_PTS) i+=5;
+
+ /* printf("%i stuffing %d\n", i, timestamps); */
+
+ for (j=0; j<i; j++)
+ *(index++) = STUFFING_BYTE;
+
+ /* should we write buffer info ? */
+
+ if (buffers)
+ {
+ *(index++) = (unsigned char) (0x40 |
+ (buffer_scale << 5) | (buffer_size >> 8));
+ *(index++) = (unsigned char) (buffer_size & 0xff);
+ }
+
+ /* should we write PTS, PTS & DTS or nothing at all ? */
+
+ switch (timestamps)
+ {
+ case TIMESTAMPS_NO:
+ *(index++) = MARKER_NO_TIMESTAMPS;
+ break;
+ case TIMESTAMPS_PTS:
+ buffer_timecode (PTS, MARKER_JUST_PTS, &index);
+ sector->TS = PTS;
+ break;
+ case TIMESTAMPS_PTS_DTS:
+ buffer_timecode (PTS, MARKER_PTS, &index);
+ buffer_timecode (DTS, MARKER_DTS, &index);
+ sector->TS = DTS;
+ break;
+ }
+
+/* read in packet data */
+
+ i = (packet_size - PACKET_HEADER_SIZE - AFTER_PACKET_LENGTH);
+
+ if (type == PADDING_STR)
+ {
+ for (j=0; j<i; j++)
+ *(index++)=(unsigned char) STUFFING_BYTE;
+ tmp = i;
+ }
+ else
+ {
+ /*tmp = fread (index, sizeof (unsigned char), i, inputstream);*/
+ memcpy(index, inputbuffer, i); tmp = i;
+ index += tmp;
+
+ /* if we did not get enough data bytes, shorten the Packet length */
+
+ if (tmp != i)
+ {
+ packet_size -= (i-tmp);
+ *(size_offset++) = (unsigned char)((packet_size - PACKET_HEADER_SIZE)>>8);
+ *(size_offset++) = (unsigned char)((packet_size - PACKET_HEADER_SIZE)&0xff);
+
+/* zero byte stuffing in the last Packet of a stream */
+/* we don't need this any more, since we shortenend the packet */
+/* for (j=tmp; j<i; j++) */
+/* *(index++)=(unsigned char) ZERO_STUFFING_BYTE; */
+ }
+ }
+
+
+ /* write other struct data */
+
+ sector->length_of_sector += packet_size;
+ sector->length_of_packet_data = tmp;
+
+}
+
+/*************************************************************************
+ writes specifical pack header information into a buffer
+ later this will be copied from the sector routine into
+ the sector buffer
+*************************************************************************/
+
+void create_pack (pack, SCR, mux_rate)
+
+Pack_struc *pack;
+unsigned int mux_rate;
+guint64 SCR;
+
+{
+ unsigned char *index;
+
+ index = pack->buf;
+
+ *(index++) = (unsigned char)((PACK_START)>>24);
+ *(index++) = (unsigned char)((PACK_START & 0x00ff0000)>>16);
+ *(index++) = (unsigned char)((PACK_START & 0x0000ff00)>>8);
+ *(index++) = (unsigned char)(PACK_START & 0x000000ff);
+ buffer_timecode (SCR, MARKER_SCR, &index);
+ *(index++) = (unsigned char)(0x80 | (mux_rate >>15));
+ *(index++) = (unsigned char)(0xff & (mux_rate >> 7));
+ *(index++) = (unsigned char)(0x01 | ((mux_rate & 0x7f)<<1));
+ pack->SCR = SCR;
+}
+
+
+/*************************************************************************
+ writes specifical system header information into a buffer
+ later this will be copied from the sector routine into
+ the sector buffer
+*************************************************************************/
+
+void create_sys_header (sys_header, rate_bound, audio_bound,
+ fixed, CSPS, audio_lock, video_lock,
+ video_bound,
+ stream1, buffer1_scale, buffer1_size,
+ stream2, buffer2_scale, buffer2_size,
+ which_streams)
+
+Sys_header_struc *sys_header;
+unsigned int rate_bound;
+unsigned char audio_bound;
+unsigned char fixed;
+unsigned char CSPS;
+unsigned char audio_lock;
+unsigned char video_lock;
+unsigned char video_bound;
+
+unsigned char stream1;
+unsigned char buffer1_scale;
+unsigned int buffer1_size;
+unsigned char stream2;
+unsigned char buffer2_scale;
+unsigned int buffer2_size;
+unsigned int which_streams;
+
+{
+ unsigned char *index;
+
+ index = sys_header->buf;
+
+ /* if we are not using both streams, we should clear some
+ options here */
+
+ if (!(which_streams & STREAMS_AUDIO))
+ audio_bound = 0;
+ if (!(which_streams & STREAMS_VIDEO))
+ video_bound = 0;
+
+ *(index++) = (unsigned char)((SYS_HEADER_START)>>24);
+ *(index++) = (unsigned char)((SYS_HEADER_START & 0x00ff0000)>>16);
+ *(index++) = (unsigned char)((SYS_HEADER_START & 0x0000ff00)>>8);
+ *(index++) = (unsigned char)(SYS_HEADER_START & 0x000000ff);
+
+ if (which_streams == STREAMS_BOTH) {
+ *(index++) = (unsigned char)(SYS_HEADER_LENGTH >> 8);
+ *(index++) = (unsigned char)(SYS_HEADER_LENGTH & 0xff);
+ } else {
+ *(index++) = (unsigned char)((SYS_HEADER_LENGTH-3) >> 8);
+ *(index++) = (unsigned char)((SYS_HEADER_LENGTH-3) & 0xff);
+ }
+
+ *(index++) = (unsigned char)(0x80 | (rate_bound >>15));
+ *(index++) = (unsigned char)(0xff & (rate_bound >> 7));
+ *(index++) = (unsigned char)(0x01 | ((rate_bound & 0x7f)<<1));
+ *(index++) = (unsigned char)((audio_bound << 2)|(fixed << 1)|CSPS);
+ *(index++) = (unsigned char)((audio_lock << 7)|
+ (video_lock << 6)|0x20|video_bound);
+
+ *(index++) = (unsigned char)RESERVED_BYTE;
+
+ if (which_streams & STREAMS_AUDIO) {
+ *(index++) = stream1;
+ *(index++) = (unsigned char) (0xc0 |
+ (buffer1_scale << 5) | (buffer1_size >> 8));
+ *(index++) = (unsigned char) (buffer1_size & 0xff);
+ }
+
+ if (which_streams & STREAMS_VIDEO) {
+ *(index++) = stream2;
+ *(index++) = (unsigned char) (0xc0 |
+ (buffer2_scale << 5) | (buffer2_size >> 8));
+ *(index++) = (unsigned char) (buffer2_size & 0xff);
+ }
+
+}
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