mirror of
https://github.com/mpv-player/mpv
synced 2024-12-20 22:02:59 +00:00
e085bc8dcf
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@22623 b3059339-0415-0410-9bf9-f77b7e298cf2
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
//=================== MPEG-ES VIDEO PARSER =========================
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "stream/stream.h"
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#include "demuxer.h"
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#include "parse_es.h"
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//static unsigned char videobuffer[MAX_VIDEO_PACKET_SIZE];
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unsigned char* videobuffer=NULL;
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int videobuf_len=0;
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int next_nal = -1;
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///! legacy variable, 4 if stream is synced, 0 if not
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int videobuf_code_len=0;
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#define MAX_SYNCLEN (10 * 1024 * 1024)
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// sync video stream, and returns next packet code
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int sync_video_packet(demux_stream_t *ds){
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if (!videobuf_code_len) {
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int skipped=0;
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if (!demux_pattern_3(ds, NULL, MAX_SYNCLEN, &skipped, 0x100)) {
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if (skipped == MAX_SYNCLEN)
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mp_msg(MSGT_DEMUXER, MSGL_ERR, "parse_es: could not sync video stream!\n", skipped);
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goto eof_out;
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}
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next_nal = demux_getc(ds);
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if (next_nal < 0)
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goto eof_out;
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videobuf_code_len = 4;
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if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped (next: 0x1%02X)\n",skipped,next_nal);
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}
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return 0x100|next_nal;
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eof_out:
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next_nal = -1;
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videobuf_code_len = 0;
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return 0;
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}
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// return: packet length
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int read_video_packet(demux_stream_t *ds){
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int packet_start;
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int res, read;
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if (VIDEOBUFFER_SIZE - videobuf_len < 5)
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return 0;
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// SYNC STREAM
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// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
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// COPY STARTCODE:
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packet_start=videobuf_len;
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videobuffer[videobuf_len+0]=0;
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videobuffer[videobuf_len+1]=0;
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videobuffer[videobuf_len+2]=1;
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videobuffer[videobuf_len+3]=next_nal;
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videobuf_len+=4;
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// READ PACKET:
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res = demux_pattern_3(ds, &videobuffer[videobuf_len],
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VIDEOBUFFER_SIZE - videobuf_len, &read, 0x100);
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videobuf_len += read;
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if (!res)
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goto eof_out;
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videobuf_len-=3;
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mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: packet 0x1%02X len=%d (total=%d)\n",videobuffer[packet_start+3],videobuf_len-packet_start,videobuf_len);
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// Save next packet code:
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next_nal = demux_getc(ds);
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if (next_nal < 0)
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goto eof_out;
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videobuf_code_len=4;
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return videobuf_len-packet_start;
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eof_out:
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next_nal = -1;
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videobuf_code_len = 0;
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return videobuf_len - packet_start;
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}
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// return: next packet code
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int skip_video_packet(demux_stream_t *ds){
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// SYNC STREAM
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// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
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videobuf_code_len=0; // force resync
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// SYNC AGAIN:
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return sync_video_packet(ds);
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}
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