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simplify registration descriptor parsing with bytestream get functions

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Originally committed as revision 18456 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-04-12 02:32:02 +00:00
parent a4d2af9b96
commit 4f1db48e88
1 changed files with 8 additions and 18 deletions
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26
libavformat/mpegts.c
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@ -21,6 +21,7 @@
#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "mpegts.h"
#include "internal.h"
@ -491,6 +492,7 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
char language[4] = {0}; /* initialize to kill warnings */
int has_hdmv_descr = 0;
int has_dirac_descr = 0;
uint32_t reg_desc = 0; /* registration descriptor */
#ifdef DEBUG_SI
av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
@ -527,14 +529,9 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
break;
program_info_length -= len + 2;
if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
uint8_t bytes[4];
bytes[0] = get8(&p, p_end);
bytes[1] = get8(&p, p_end);
bytes[2] = get8(&p, p_end);
bytes[3] = get8(&p, p_end);
reg_desc = bytestream_get_le32(&p);
len -= 4;
if(bytes[0] == 'H' && bytes[1] == 'D' &&
bytes[2] == 'M' && bytes[3] == 'V')
if(reg_desc == AV_RL32("HDMV"))
has_hdmv_descr = 1;
}
p += len;
@ -601,17 +598,10 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
language[3] = 0;
break;
case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
{
uint8_t bytes[4];
bytes[0] = get8(&p, desc_end);
bytes[1] = get8(&p, desc_end);
bytes[2] = get8(&p, desc_end);
bytes[3] = get8(&p, desc_end);
if(bytes[0] == 'd' && bytes[1] == 'r' &&
bytes[2] == 'a' && bytes[3] == 'c')
has_dirac_descr = 1;
break;
}
reg_desc = bytestream_get_le32(&p);
if(reg_desc == AV_RL32("drac"))
has_dirac_descr = 1;
break;
default:
break;
}