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|
/*****************************************************************
|
| AP4 - AVC Bitstream Stream Info
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include "Ap4.h"
#include "Ap4AvcParser.h"
#include "Ap4BitStream.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
#define BANNER "AVC Bitstream Info - Version 1.0\n"\
"(Bento4 Version " AP4_VERSION_STRING ")\n"\
"(c) 2002-2009 Axiomatic Systems, LLC"
/*----------------------------------------------------------------------
| PrintUsageAndExit
+---------------------------------------------------------------------*/
static void
PrintUsageAndExit()
{
fprintf(stderr,
BANNER
"\n\nusage: avcinfo [options] <input>\n"
"Options:\n"
" --verbose: show more details\n");
exit(1);
}
/*----------------------------------------------------------------------
| ReadGolomb
+---------------------------------------------------------------------*/
static unsigned int
ReadGolomb(AP4_BitStream& bits)
{
unsigned int leading_zeros = 0;
while (bits.ReadBit() == 0) {
leading_zeros++;
}
if (leading_zeros) {
return (1<<leading_zeros)-1+bits.ReadBits(leading_zeros);
} else {
return 0;
}
}
/*----------------------------------------------------------------------
| PrintSliceInfo
+---------------------------------------------------------------------*/
static void
PrintSliceInfo(const unsigned char* data)
{
AP4_BitStream bits;
bits.WriteBytes(data, 8);
ReadGolomb(bits);
unsigned int slice_type = ReadGolomb(bits);
const char* slice_type_name = AP4_AvcNalParser::SliceTypeName(slice_type);
if (slice_type_name == NULL) slice_type_name = "?";
printf(" slice=%d (%s)", slice_type, slice_type_name);
}
/*----------------------------------------------------------------------
| main
+---------------------------------------------------------------------*/
int
main(int argc, char** argv)
{
if (argc < 2) {
PrintUsageAndExit();
}
const char* filename = NULL;
//bool verbose = false;
while (char* arg = *++argv) {
if (!strcmp(arg, "--verbose")) {
//verbose = true;
} else {
if (filename == NULL) {
filename = arg;
} else {
fprintf(stderr, "ERROR: unexpected argument '%s'\n", arg);
return 1;
}
}
}
if (filename == NULL) {
fprintf(stderr, "ERROR: filename missing\n");
return 1;
}
AP4_ByteStream* input = NULL;
AP4_Result result = AP4_FileByteStream::Create(filename,
AP4_FileByteStream::STREAM_MODE_READ,
input);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: cannot open input file %s (%d)\n", filename, result);
return 1;
}
AP4_AvcNalParser parser;
unsigned int nalu_count = 0;
for (;;) {
bool eos;
unsigned char input_buffer[4096];
AP4_Size bytes_in_buffer = 0;
result = input->ReadPartial(input_buffer, sizeof(input_buffer), bytes_in_buffer);
if (AP4_SUCCEEDED(result)) {
eos = false;
} else if (result == AP4_ERROR_EOS) {
eos = true;
} else {
fprintf(stderr, "ERROR: failed to read from input file\n");
break;
}
AP4_Size offset = 0;
do {
const AP4_DataBuffer* nalu = NULL;
AP4_Size bytes_consumed = 0;
result = parser.Feed(&input_buffer[offset], bytes_in_buffer, bytes_consumed, nalu, eos);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: Feed() failed (%d)\n", result);
break;
}
if (nalu) {
const unsigned char* nalu_payload = (const unsigned char*)nalu->GetData();
unsigned int nalu_type = nalu_payload[0]&0x1F;
const char* nalu_type_name = AP4_AvcNalParser::NaluTypeName(nalu_type);
if (nalu_type_name == NULL) nalu_type_name = "UNKNOWN";
printf("NALU %5d: size=%5d, type=%02d (%s)",
nalu_count,
(int)nalu->GetDataSize(),
nalu_type,
nalu_type_name);
if (nalu_type == 9) {
unsigned int primary_pic_type = (nalu_payload[1]>>5);
const char* primary_pic_type_name = AP4_AvcNalParser::PrimaryPicTypeName(primary_pic_type);
if (primary_pic_type_name == NULL) primary_pic_type_name = "UNKNOWN";
printf(" [%d:%s]\n", primary_pic_type, primary_pic_type_name);
} else if (nalu_type == 1 || nalu_type == 2 || nalu_type == 5 || nalu_type == 19) {
PrintSliceInfo(&nalu_payload[1]);
printf("\n");
} else {
printf("\n");
}
nalu_count++;
}
offset += bytes_consumed;
bytes_in_buffer -= bytes_consumed;
} while (bytes_in_buffer);
if (eos) break;
}
input->Release();
return 0;
}
|
