diff options
Diffstat (limited to 'src/utils/flacdiff/main.cpp')
| -rw-r--r-- | src/utils/flacdiff/main.cpp | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/utils/flacdiff/main.cpp b/src/utils/flacdiff/main.cpp new file mode 100644 index 0000000..358fe04 --- /dev/null +++ b/src/utils/flacdiff/main.cpp @@ -0,0 +1,230 @@ +/* flacdiff - Displays where two FLAC streams differ + * Copyright (C) 2007-2009 Josh Coalson + * Copyright (C) 2011-2023 Xiph.Org Foundation + * + * This program 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 + * of the License, or (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <stdio.h> +#include <string.h> +#include "FLAC++/decoder.h" +#include "share/compat.h" + +#ifdef _MSC_VER +// warning C4800: 'int' : forcing to bool 'true' or 'false' (performance warning) +#pragma warning ( disable : 4800 ) +#endif + +class AutoFILE { +protected: + ::FILE *f_; +public: + inline AutoFILE(const char *path, const char *mode): f_(::fopen(path, mode)) { } + inline virtual ~AutoFILE() { if (f_) (void)::fclose(f_); } + + inline operator bool() const { return 0 != f_; } + inline operator const ::FILE *() const { return f_; } + inline operator ::FILE *() { return f_; } +private: + AutoFILE(); + AutoFILE(const AutoFILE &); + void operator=(const AutoFILE &); +}; + +class Decoder: public FLAC::Decoder::Stream { +public: + Decoder(AutoFILE &f, FLAC__off_t tgt): tgtpos_((FLAC__uint64)tgt), curpos_(0), go_(true), err_(false), frame_(), f_(f) { memset(&frame_, 0, sizeof(::FLAC__Frame)); } + FLAC__uint64 tgtpos_, curpos_; + bool go_, err_; + ::FLAC__Frame frame_; +protected: + AutoFILE &f_; + // from FLAC::Decoder::Stream + virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes) + { + *bytes = fread(buffer, 1, *bytes, f_); + if(ferror((FILE*)f_)) + return ::FLAC__STREAM_DECODER_READ_STATUS_ABORT; + else if(*bytes == 0 && feof((FILE*)f_)) + return ::FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; + else + return ::FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; + } + + virtual ::FLAC__StreamDecoderTellStatus tell_callback(FLAC__uint64 *absolute_byte_offset) + { + FLAC__off_t off = ftello(f_); + if(off < 0) + return ::FLAC__STREAM_DECODER_TELL_STATUS_ERROR; + *absolute_byte_offset = off; + return ::FLAC__STREAM_DECODER_TELL_STATUS_OK; + } + + virtual bool eof_callback() + { + return (bool)feof((FILE*)f_); + } + + virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const /*buffer*/[]) + { + FLAC__uint64 pos; + if(!get_decode_position(&pos)) { + go_ = false; + err_ = true; + return ::FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; + } + if(pos > tgtpos_) { + go_ = false; + frame_ = *frame; + } + else + curpos_ = pos; + return ::FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; + } + + virtual void error_callback(::FLAC__StreamDecoderErrorStatus status) + { + fprintf(stderr, "got error %d:%s\n", status, ::FLAC__StreamDecoderErrorStatusString[status]); + go_ = false; + err_ = true; + } +}; + +static bool show_diff(AutoFILE &f1, AutoFILE &f2, FLAC__off_t off) +{ + Decoder d1(f1, off), d2(f2, off); + if(!d1) { + fprintf(stderr, "ERROR: setting up decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1)); + return false; + } + if(!d2) { + fprintf(stderr, "ERROR: setting up decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2)); + return false; + } + ::FLAC__StreamDecoderInitStatus is; + if((is = d1.init()) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { + fprintf(stderr, "ERROR: initializing decoder1, status=%s state=%s\n", FLAC__StreamDecoderInitStatusString[is], d1.get_state().resolved_as_cstring(d1)); + return false; + } + if((is = d2.init()) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { + fprintf(stderr, "ERROR: initializing decoder2, status=%s state=%s\n", FLAC__StreamDecoderInitStatusString[is], d2.get_state().resolved_as_cstring(d2)); + return false; + } + if(!d1.process_until_end_of_metadata()) { + fprintf(stderr, "ERROR: skipping metadata in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1)); + return false; + } + if(!d2.process_until_end_of_metadata()) { + fprintf(stderr, "ERROR: skipping metadata in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2)); + return false; + } + while(d1.go_ && d2.go_) { + if(!d1.process_single()) { + fprintf(stderr, "ERROR: decoding frame in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1)); + return false; + } + if(!d2.process_single()) { + fprintf(stderr, "ERROR: decoding frame in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2)); + return false; + } + } + if(d1.err_) { + fprintf(stderr, "ERROR: got err_ in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1)); + return false; + } + if(d2.err_) { + fprintf(stderr, "ERROR: got err_ in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2)); + return false; + } + if(d1.go_ != d2.go_) { + fprintf(stderr, "ERROR: d1.go_(%s) != d2.go_(%s)\n", d1.go_?"true":"false", d2.go_?"true":"false"); + return false; + } + fprintf(stdout, "pos1 = %" PRIu64 " blocksize=%u sample#%" PRIu64 " frame#%" PRIu64 "\n", d1.curpos_, d1.frame_.header.blocksize, d1.frame_.header.number.sample_number, d1.frame_.header.number.sample_number / d1.frame_.header.blocksize); + fprintf(stdout, "pos2 = %" PRIu64 " blocksize=%u sample#%" PRIu64 " frame#%" PRIu64 "\n", d2.curpos_, d2.frame_.header.blocksize, d2.frame_.header.number.sample_number, d2.frame_.header.number.sample_number / d2.frame_.header.blocksize); + + return true; +} + +static FLAC__off_t get_diff_offset(AutoFILE &f1, AutoFILE &f2) +{ + FLAC__off_t off = 0; + while(1) { + if(feof((FILE*)f1) && feof((FILE*)f2)) { + fprintf(stderr, "ERROR: files are identical\n"); + return -1; + } + if(feof((FILE*)f1)) { + fprintf(stderr, "ERROR: file1 EOF\n"); + return -1; + } + if(feof((FILE*)f2)) { + fprintf(stderr, "ERROR: file2 EOF\n"); + return -1; + } + if(fgetc(f1) != fgetc(f2)) + return off; + off++; + } +} + +static bool run(const char *fn1, const char *fn2) +{ + FLAC__off_t off; + AutoFILE f1(fn1, "rb"), f2(fn2, "rb"); + + if(!f1) { + flac_fprintf(stderr, "ERROR: opening %s for reading\n", fn1); + return false; + } + if(!f2) { + flac_fprintf(stderr, "ERROR: opening %s for reading\n", fn2); + return false; + } + + if((off = get_diff_offset(f1, f2)) < 0) + return false; + + fprintf(stdout, "got diff offset = %" PRId64 "\n", off); + + return show_diff(f1, f2, off); +} + +int main(int argc, char *argv[]) +{ + const char *usage = "usage: flacdiff flacfile1 flacfile2\n"; + +#ifdef _WIN32 + if (get_utf8_argv(&argc, &argv) != 0) { + fprintf(stderr, "ERROR: failed to convert command line parameters to UTF-8\n"); + return 1; + } +#endif + + if(argc > 1 && 0 == strcmp(argv[1], "-h")) { + printf("%s", usage); + return 0; + } + else if(argc != 3) { + fprintf(stderr, "%s", usage); + return 255; + } + + return run(argv[1], argv[2])? 0 : 1; +} |