mirror of https://github.com/mpv-player/mpv
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* set of helper routines for building MPEG 1/2 PS/PES packets
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*
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* Copyright (C) 2006 Benjamin Zores
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*
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* Based on code borrowed from vo_mpegpes/vo_dxr2:
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* (C) 2000 Ralph Metzler <ralph@convergence.de>
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* Marcus Metzler <marcus@convergence.de>
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* Gerard Lantau
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <unistd.h>
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#include <string.h>
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#include <inttypes.h>
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#include "mp_msg.h"
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#include "mpeg_packetizer.h"
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#define PES_MAX_SIZE 2048
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static const unsigned char ps2_header[] = {
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0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x04, 0x00,
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0x04, 0x01, 0x01, 0x86, 0xa3, 0xf8
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};
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static const unsigned char ps1_header[] = {
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0x00, 0x00, 0x01, 0xba, 0x21, 0x00,
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0xb9, 0x37, 0x83, 0x80, 0xc3, 0x51,
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};
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/* Send MPEG <type> PES packet */
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static int
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send_mpeg_pes_packet_ll(unsigned char *data, int len, int id, uint64_t pts,
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int type, unsigned char *header, int header_len,
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int align4, int my_write (const unsigned char *data, int len))
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{
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int ptslen = (pts ? 5 : 0);
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int n = 0;
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int idx, plen;
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int hdr;
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unsigned char pes_header[PES_MAX_SIZE];
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mp_msg (MSGT_HEADER, MSGL_DBG2,
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"MPEG%d PES packet: 0x%x => %"PRIu64" \n", type, id, pts);
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memset (pes_header, '\0', PES_MAX_SIZE);
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/* startcode */
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pes_header[0] = 0;
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pes_header[1] = 0;
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pes_header[2] = 0x01;
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pes_header[3] = id; /* stream id */
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while (len > 0)
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{
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int payload_size = len; /* data + PTS */
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if(type == 2)
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hdr = 3;
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else
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hdr = (ptslen ? 0 : 1);
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if (6 + hdr + ptslen + payload_size + header_len > PES_MAX_SIZE)
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payload_size = PES_MAX_SIZE - 6 - hdr - ptslen - header_len;
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if(align4)
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payload_size &= ~3;
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/* construct PES header: packetize */
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plen = payload_size + hdr + ptslen + header_len;
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pes_header[4] = plen >> 8;
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pes_header[5] = plen & 255;
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idx = 6;
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if (ptslen)
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{
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int x;
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if(type == 2)
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{
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pes_header[idx++] = 0x81;
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pes_header[idx++] = 0x80;
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pes_header[idx++] = ptslen;
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}
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/* presentation time stamp */
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x = (0x02 << 4) | (((pts >> 30) & 0x07) << 1) | 1;
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pes_header[idx++] = x;
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x = ((((pts >> 15) & 0x7fff) << 1) | 1);
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pes_header[idx++] = x >>8;
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pes_header[idx++] = x & 255;
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x = (((pts & 0x7fff) << 1) | 1);
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pes_header[idx++] = x >> 8;
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pes_header[idx++] = x & 255;
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}
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else
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{
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if(type == 2)
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{
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pes_header[idx++] = 0x81;
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pes_header[idx++] = 0x00;
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pes_header[idx++] = 0x00;
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}
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else
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pes_header[idx++] = 0x0f;
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}
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if(header_len)
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{
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memcpy(&pes_header[idx], header, header_len);
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idx += header_len;
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}
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my_write (pes_header, idx);
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n = my_write (data, payload_size);
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len -= n;
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data += n;
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ptslen = 0; /* store PTS only once, at first packet! */
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if(align4 && len < 4)
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break;
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}
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return n;
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}
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int
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send_mpeg_pes_packet (unsigned char *data, int len, int id, uint64_t pts,
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int type, int my_write (const unsigned char *data, int len))
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{
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return send_mpeg_pes_packet_ll(data, len, id, pts, type, NULL, 0, 0, my_write);
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}
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