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calculate length from file size

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nu774
2013-01-09 11:37:25 +09:00
parent 6854317606
commit 6887939854
1 changed files with 29 additions and 15 deletions
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44
src/wav_reader.c
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@@ -38,6 +38,7 @@ struct wav_reader_t {
pcm_sample_description_t sample_format;
int64_t length;
int64_t position;
int32_t data_offset;
int ignore_length;
int last_error;
wav_io_context_t io;
@@ -240,9 +241,8 @@ int riff_ds64(wav_reader_t *reader, int64_t *length)
fcc == RIFF_FOURCC('d','s','6','4') && chunk_size >= 28);
TRY_IO(riff_scan(reader, "QQQL",
&riff_size, length, &sample_count, &table_size) != 4);
if (table_size == 0)
return 0;
reader->last_error = WAV_UNSUPPORTED_FORMAT;
TRY_IO(riff_skip(reader, (chunk_size - 27) & ~1));
reader->data_offset += (chunk_size + 9) & ~1;
FAIL:
return -1;
}
@@ -321,6 +321,8 @@ int wav_parse(wav_reader_t *reader, int64_t *data_length)
TRY_IO(riff_read32(reader, &fcc));
if (fcc != RIFF_FOURCC('W','A','V','E'))
goto FAIL;
reader->data_offset = 12;
if (container == RIFF_FOURCC('R','F','6','4'))
riff_ds64(reader, data_length);
while ((fcc = riff_next_chunk(reader, &chunk_size)) != 0) {
@@ -330,9 +332,12 @@ int wav_parse(wav_reader_t *reader, int64_t *data_length)
} else if (fcc == RIFF_FOURCC('d','a','t','a')) {
if (container == RIFF_FOURCC('R','I','F','F'))
*data_length = chunk_size;
reader->data_offset += 8;
break;
} else
} else {
TRY_IO(riff_skip(reader, (chunk_size + 1) & ~1));
}
reader->data_offset += (chunk_size + 9) & ~1;
}
if (fcc == RIFF_FOURCC('d','a','t','a'))
return 0;
@@ -343,8 +348,9 @@ FAIL:
wav_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
int ignore_length)
{
wav_reader_t *reader;
wav_reader_t *reader = 0;
int64_t data_length;
unsigned bpf;
if ((reader = calloc(1, sizeof(wav_reader_t))) == 0)
return 0;
@@ -355,11 +361,20 @@ wav_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
free(reader);
return 0;
}
if (ignore_length || !data_length ||
data_length % reader->sample_format.bytes_per_frame != 0)
bpf = reader->sample_format.bytes_per_frame;
if (ignore_length || !data_length || data_length % bpf)
reader->length = INT64_MAX;
else
reader->length = data_length / reader->sample_format.bytes_per_frame;
reader->length = data_length / bpf;
if (reader->length == INT64_MAX && reader->io.seek && reader->io.tell) {
if (reader->io.seek(reader->io_cookie, 0, SEEK_END) >= 0) {
int64_t size = reader->io.tell(reader->io_cookie);
if (size > 0)
reader->length = (size - reader->data_offset) / bpf;
reader->io.seek(reader->io_cookie, reader->data_offset, SEEK_SET);
}
}
return reader;
}
@@ -374,16 +389,15 @@ wav_reader_t *raw_open(wav_io_context_t *io_ctx, void *io_cookie,
memcpy(&reader->sample_format, desc, sizeof(pcm_sample_description_t));
reader->io_cookie = io_cookie;
if (io_ctx->seek && io_ctx->tell) {
TRY_IO(riff_seek(reader, 0, SEEK_END));
reader->length = riff_tell(reader) / desc->bytes_per_frame;
TRY_IO(riff_seek(reader, 0, SEEK_SET));
if (reader->io.seek(reader->io_cookie, 0, SEEK_END) >= 0) {
int64_t size = reader->io.tell(reader->io_cookie);
if (size > 0)
reader->length = size / desc->bytes_per_frame;
reader->io.seek(reader->io_cookie, reader->data_offset, SEEK_SET);
}
} else
reader->length = INT64_MAX;
return reader;
FAIL:
if (reader)
free(reader);
return 0;
}