mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 16:26:39 +00:00
295 lines
8.1 KiB
C
295 lines
8.1 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "main.h"
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static void
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buffer_timecode (timecode, marker, buffer)
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guint64 timecode;
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unsigned char marker;
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unsigned char **buffer;
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{
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unsigned char temp;
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temp = (marker << 4) | ((timecode >> 29) & 0x38) |
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((timecode >> 29) & 0x6) | 1;
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*((*buffer)++) = temp;
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temp = (timecode & 0x3fc00000) >> 22;
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*((*buffer)++) = temp;
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temp = ((timecode & 0x003f8000) >> 14) | 1;
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*((*buffer)++) = temp;
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temp = (timecode & 0x7f80) >> 7;
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*((*buffer)++) = temp;
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temp = ((timecode & 0x007f) << 1) | 1;
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*((*buffer)++) = temp;
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}
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/*************************************************************************
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creates a complete sector.
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Also copies Pack and Sys_Header informations into the
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sector buffer, then reads a packet full of data from
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the input stream into the sector buffer.
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*************************************************************************/
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void
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create_sector (sector, pack, sys_header,
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packet_size, inputbuffer, type,
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buffer_scale, buffer_size, buffers, PTS, DTS, timestamps, which_streams)
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Sector_struc *sector;
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Pack_struc *pack;
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Sys_header_struc *sys_header;
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unsigned int packet_size;
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unsigned char *inputbuffer;
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unsigned char type;
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unsigned char buffer_scale;
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unsigned int buffer_size;
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unsigned char buffers;
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guint64 PTS;
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guint64 DTS;
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unsigned char timestamps;
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unsigned int which_streams;
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{
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int i, j, tmp;
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unsigned char *index;
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unsigned char *size_offset;
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/* printf("creating sector\n"); */
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index = sector->buf;
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sector->length_of_sector = 0;
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/* Should we copy Pack Header information ? */
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if (pack != NULL) {
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i = sizeof (pack->buf);
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memcpy (index, pack->buf, i);
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index += i;
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sector->length_of_sector += i;
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}
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/* Should we copy System Header information ? */
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if (sys_header != NULL) {
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i = sizeof (sys_header->buf);
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/* only one stream? 3 bytes less in sys header */
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if (which_streams != STREAMS_BOTH)
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i -= 3;
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memcpy (index, sys_header->buf, i);
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index += i;
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sector->length_of_sector += i;
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}
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/* write constant packet header data */
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*(index++) = (unsigned char) (PACKET_START) >> 16;
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*(index++) = (unsigned char) (PACKET_START & 0x00ffff) >> 8;
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*(index++) = (unsigned char) (PACKET_START & 0x0000ff);
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*(index++) = type;
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/* we remember this offset in case we will have to shrink this packet */
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size_offset = index;
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*(index++) = (unsigned char) ((packet_size - PACKET_HEADER_SIZE) >> 8);
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*(index++) = (unsigned char) ((packet_size - PACKET_HEADER_SIZE) & 0xff);
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*(index++) = STUFFING_BYTE;
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*(index++) = STUFFING_BYTE;
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*(index++) = STUFFING_BYTE;
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i = 0;
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if (!buffers)
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i += 2;
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if (timestamps == TIMESTAMPS_NO)
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i += 9;
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else if (timestamps == TIMESTAMPS_PTS)
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i += 5;
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/* printf("%i stuffing %d\n", i, timestamps); */
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for (j = 0; j < i; j++)
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*(index++) = STUFFING_BYTE;
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/* should we write buffer info ? */
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if (buffers) {
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*(index++) = (unsigned char) (0x40 |
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(buffer_scale << 5) | (buffer_size >> 8));
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*(index++) = (unsigned char) (buffer_size & 0xff);
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}
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/* should we write PTS, PTS & DTS or nothing at all ? */
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switch (timestamps) {
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case TIMESTAMPS_NO:
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*(index++) = MARKER_NO_TIMESTAMPS;
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break;
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case TIMESTAMPS_PTS:
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buffer_timecode (PTS, MARKER_JUST_PTS, &index);
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sector->TS = PTS;
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break;
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case TIMESTAMPS_PTS_DTS:
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buffer_timecode (PTS, MARKER_PTS, &index);
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buffer_timecode (DTS, MARKER_DTS, &index);
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sector->TS = DTS;
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break;
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}
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/* read in packet data */
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i = (packet_size - PACKET_HEADER_SIZE - AFTER_PACKET_LENGTH);
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if (type == PADDING_STR) {
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for (j = 0; j < i; j++)
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*(index++) = (unsigned char) STUFFING_BYTE;
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tmp = i;
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} else {
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/*tmp = fread (index, sizeof (unsigned char), i, inputstream); */
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memcpy (index, inputbuffer, i);
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tmp = i;
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index += tmp;
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/* if we did not get enough data bytes, shorten the Packet length */
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if (tmp != i) {
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packet_size -= (i - tmp);
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*(size_offset++) =
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(unsigned char) ((packet_size - PACKET_HEADER_SIZE) >> 8);
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*(size_offset++) =
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(unsigned char) ((packet_size - PACKET_HEADER_SIZE) & 0xff);
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/* zero byte stuffing in the last Packet of a stream */
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/* we don't need this any more, since we shortenend the packet */
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/* for (j=tmp; j<i; j++) */
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/* *(index++)=(unsigned char) ZERO_STUFFING_BYTE; */
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}
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}
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/* write other struct data */
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sector->length_of_sector += packet_size;
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sector->length_of_packet_data = tmp;
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}
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/*************************************************************************
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writes specifical pack header information into a buffer
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later this will be copied from the sector routine into
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the sector buffer
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*************************************************************************/
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void
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create_pack (pack, SCR, mux_rate)
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Pack_struc *pack;
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unsigned int mux_rate;
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guint64 SCR;
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{
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unsigned char *index;
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index = pack->buf;
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*(index++) = (unsigned char) ((PACK_START) >> 24);
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*(index++) = (unsigned char) ((PACK_START & 0x00ff0000) >> 16);
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*(index++) = (unsigned char) ((PACK_START & 0x0000ff00) >> 8);
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*(index++) = (unsigned char) (PACK_START & 0x000000ff);
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buffer_timecode (SCR, MARKER_SCR, &index);
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*(index++) = (unsigned char) (0x80 | (mux_rate >> 15));
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*(index++) = (unsigned char) (0xff & (mux_rate >> 7));
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*(index++) = (unsigned char) (0x01 | ((mux_rate & 0x7f) << 1));
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pack->SCR = SCR;
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}
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/*************************************************************************
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writes specifical system header information into a buffer
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later this will be copied from the sector routine into
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the sector buffer
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*************************************************************************/
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void
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create_sys_header (sys_header, rate_bound, audio_bound,
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fixed, CSPS, audio_lock, video_lock,
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video_bound,
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stream1, buffer1_scale, buffer1_size,
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stream2, buffer2_scale, buffer2_size, which_streams)
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Sys_header_struc *sys_header;
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unsigned int rate_bound;
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unsigned char audio_bound;
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unsigned char fixed;
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unsigned char CSPS;
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unsigned char audio_lock;
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unsigned char video_lock;
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unsigned char video_bound;
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unsigned char stream1;
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unsigned char buffer1_scale;
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unsigned int buffer1_size;
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unsigned char stream2;
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unsigned char buffer2_scale;
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unsigned int buffer2_size;
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unsigned int which_streams;
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{
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unsigned char *index;
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index = sys_header->buf;
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/* if we are not using both streams, we should clear some
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options here */
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if (!(which_streams & STREAMS_AUDIO))
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audio_bound = 0;
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if (!(which_streams & STREAMS_VIDEO))
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video_bound = 0;
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*(index++) = (unsigned char) ((SYS_HEADER_START) >> 24);
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*(index++) = (unsigned char) ((SYS_HEADER_START & 0x00ff0000) >> 16);
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*(index++) = (unsigned char) ((SYS_HEADER_START & 0x0000ff00) >> 8);
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*(index++) = (unsigned char) (SYS_HEADER_START & 0x000000ff);
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if (which_streams == STREAMS_BOTH) {
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*(index++) = (unsigned char) (SYS_HEADER_LENGTH >> 8);
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*(index++) = (unsigned char) (SYS_HEADER_LENGTH & 0xff);
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} else {
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*(index++) = (unsigned char) ((SYS_HEADER_LENGTH - 3) >> 8);
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*(index++) = (unsigned char) ((SYS_HEADER_LENGTH - 3) & 0xff);
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}
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*(index++) = (unsigned char) (0x80 | (rate_bound >> 15));
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*(index++) = (unsigned char) (0xff & (rate_bound >> 7));
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*(index++) = (unsigned char) (0x01 | ((rate_bound & 0x7f) << 1));
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*(index++) = (unsigned char) ((audio_bound << 2) | (fixed << 1) | CSPS);
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*(index++) = (unsigned char) ((audio_lock << 7) |
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(video_lock << 6) | 0x20 | video_bound);
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*(index++) = (unsigned char) RESERVED_BYTE;
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if (which_streams & STREAMS_AUDIO) {
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*(index++) = stream1;
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*(index++) = (unsigned char) (0xc0 |
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(buffer1_scale << 5) | (buffer1_size >> 8));
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*(index++) = (unsigned char) (buffer1_size & 0xff);
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}
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if (which_streams & STREAMS_VIDEO) {
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*(index++) = stream2;
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*(index++) = (unsigned char) (0xc0 |
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(buffer2_scale << 5) | (buffer2_size >> 8));
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*(index++) = (unsigned char) (buffer2_size & 0xff);
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}
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}
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