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Check that MD5 sums are the same when re-encoding FLAC file

This commit is contained in:
Martijn van Beurden 2024-07-15 09:52:06 +02:00
parent ef35c28dfd
commit a9306bb390
1 changed files with 24 additions and 0 deletions
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24
src/flac/encode.c
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@ -97,6 +97,7 @@ typedef struct {
uint32_t old_samples_written;
clock_t old_clock;
#endif
FLAC__byte md5sum_input[16];
SampleInfo info;
@ -994,6 +995,11 @@ int flac__encode_file(FILE *infile, FLAC__off_t infilesize, const char *infilena
return EncoderSession_finish_error(&encoder_session);
}
/* Get md5sum from FLAC */
if(options.format == FORMAT_FLAC || options.format == FORMAT_OGGFLAC) {
memcpy(encoder_session.md5sum_input,encoder_session.fmt.flac.client_data.metadata_blocks[0]->data.stream_info.md5sum,16);
}
/*
* now that we know the sample rate, canonicalize the
* --skip string to an absolute sample number:
@ -1108,6 +1114,11 @@ int flac__encode_file(FILE *infile, FLAC__off_t infilesize, const char *infilena
if(options.format == FORMAT_FLAC || options.format == FORMAT_OGGFLAC)
encoder_session.fmt.flac.client_data.samples_left_to_process = encoder_session.total_samples_to_encode;
/* Input MD5sum is only usable when reencoding the whole file, to a file */
if(skip > 0 || until > 0 || encoder_session.is_stdout) {
memset(encoder_session.md5sum_input,0,16);
}
stats_new_file();
/* init the encoder */
if(!EncoderSession_init_encoder(&encoder_session, options))
@ -1412,6 +1423,7 @@ FLAC__bool EncoderSession_construct(EncoderSession *e, encode_options_t options,
e->old_samples_written = 0;
#endif
e->compression_ratio = 0.0;
memset(e->md5sum_input,0,16);
memset(&e->info, 0, sizeof(e->info));
@ -1495,6 +1507,7 @@ int EncoderSession_finish_ok(EncoderSession *e, foreign_metadata_t *foreign_meta
{
FLAC__StreamEncoderState fse_state = FLAC__STREAM_ENCODER_OK;
int ret = 0;
FLAC__byte empty_md5sum[16] = {0};
FLAC__bool verify_error = false;
if(e->encoder) {
@ -1518,6 +1531,17 @@ int EncoderSession_finish_ok(EncoderSession *e, foreign_metadata_t *foreign_meta
ret = 1;
}
if(memcmp(e->md5sum_input,&empty_md5sum,16) != 0) {
FLAC__StreamMetadata streaminfo;
if(!FLAC__metadata_get_streaminfo(e->outfilename, &streaminfo)) {
flac__utils_printf(stderr, 1, "%s: ERROR: could not read back MD5sum of output\n", e->inbasefilename);
ret = 1;
}
else if(memcmp(streaminfo.data.stream_info.md5sum,e->md5sum_input,16) != 0) {
flac__utils_printf(stderr, 1, "%s: ERROR: MD5sum of input is different from MD5sum of output\n", e->inbasefilename);
ret = 1;
}
}
/*@@@@@@ should this go here or somewhere else? */
if(ret == 0 && foreign_metadata) {
const char *error;