static boolean buf_src_fill_input_buffer(j_decompress_ptr cinfo) {
static JOCTET mybuffer[4];
buf_src_mgr *src = (buf_src_mgr *)cinfo->src;
// Consume the entire buffer, even if bytes are still in bytes_in_buffer
buffer_consume(src->buf, buffer_len(src->buf));
if (!buffer_check_load(src->buf, src->fp, 1, BUF_SIZE))
goto eof;
cinfo->src->next_input_byte = (JOCTET *)buffer_ptr(src->buf);
cinfo->src->bytes_in_buffer = buffer_len(src->buf);
goto ok;
eof:
// Insert a fake EOI marker if we can't read enough data
LOG_DEBUG(" EOF filling input buffer, returning EOI marker\n");
mybuffer[0] = (JOCTET)0xFF;
mybuffer[1] = (JOCTET)JPEG_EOI;
cinfo->src->next_input_byte = mybuffer;
cinfo->src->bytes_in_buffer = 2;
ok:
return TRUE;
}
static void image_png_read_buf(png_structp png_ptr, png_bytep data, png_size_t len) {
PNGData *p = (PNGData *)png_get_io_ptr(png_ptr);
//LOG_DEBUG("PNG read_buf wants %ld bytes, %d in buffer\n", len, buffer_len(p->buf));
if (!buffer_check_load(p->buf, p->fp, len, BUF_SIZE))
goto eof;
memcpy(data, buffer_ptr(p->buf), len);
buffer_consume(p->buf, len);
goto ok;
eof:
png_error(png_ptr, "Not enough PNG data");
ok:
return;
}
static void
_parse_wav(ScanData s, Buffer *buf)
{
uint32_t offset = 12;
s->type_name = "wav";
mediascan_add_StreamData(s, 1);
while ( offset < s->size - 8 ) {
char chunk_id[5];
uint32_t chunk_size;
// Verify we have at least 8 bytes
if ( !buffer_check_load(buf, s->fp, 8, BLOCK_SIZE) ) {
return;
}
strncpy( chunk_id, (char *)buffer_ptr(buf), 4 );
chunk_id[4] = '\0';
buffer_consume(buf, 4);
chunk_size = buffer_get_int_le(buf);
// Adjust for padding
if ( chunk_size % 2 ) {
chunk_size++;
}
offset += 8;
LOG_DEBUG("%s size %d\n", chunk_id, chunk_size);
// Seek past data, everything else we parse
// XXX: Are there other large chunks we should ignore?
if ( !strcmp( chunk_id, "data" ) ) {
s->audio_offset = offset;
s->audio_size = chunk_size;
// Calculate duration, unless we already know it (i.e. from 'fact')
if ( !s->duration_ms ) {
if (s->bitrate) {
s->duration_ms = (chunk_size / (s->bitrate / 8.)) * 1000;
}
}
// sanity check size, this is inside the data chunk code
// to support setting audio_offset even when the data size is wrong
if (chunk_size > s->size - offset) {
LOG_DEBUG("data size > file_size, skipping\n");
return;
}
// Seek past data if there are more chunks after it
if ( s->size > offset + chunk_size ) {
fseek(s->fp, offset + chunk_size, SEEK_SET);
}
buffer_clear(buf);
}
else if ( !strcmp( chunk_id, "id3 " ) || !strcmp( chunk_id, "ID3 " ) || !strcmp( chunk_id, "ID32" ) ) {
// Read header to verify version
unsigned char *bptr = buffer_ptr(buf);
if (
(bptr[0] == 'I' && bptr[1] == 'D' && bptr[2] == '3') &&
bptr[3] < 0xff && bptr[4] < 0xff &&
bptr[6] < 0x80 && bptr[7] < 0x80 && bptr[8] < 0x80 && bptr[9] < 0x80
) {
// Start parsing ID3 from offset
//parse_id3(infile, file, info, tags, offset, file_size);
}
// Seek past ID3 and clear buffer
fseek(s->fp, offset + chunk_size, SEEK_SET);
buffer_clear(buf);
}
else {
// sanity check size
if (chunk_size > s->size - offset) {
LOG_DEBUG("chunk_size > file_size, skipping\n");
return;
}
// Make sure we have enough data
if ( !buffer_check_load(buf, s->fp, chunk_size, BLOCK_SIZE) ) {
return;
}
if ( !strcmp( chunk_id, "fmt " ) ) {
_parse_wav_fmt(s, buf, chunk_size);
}
else if ( !strcmp( chunk_id, "LIST" ) ) {
//_parse_wav_list(buf, chunk_size, tags);
}
else if ( !strcmp( chunk_id, "PEAK" ) ) {
_parse_wav_peak(s, buf, chunk_size, 0);
}
else if ( !strcmp( chunk_id, "fact" ) ) {
// A 4-byte fact chunk in a non-PCM wav is the number of samples
// Use it to calculate duration
if ( chunk_size == 4 ) {
uint32_t num_samples = buffer_get_int_le(buf);
if (s->streams[0].samplerate) {
s->duration_ms = (num_samples * 1000) / s->streams[0].samplerate;
}
}
else {
// Unknown, skip it
buffer_consume(buf, chunk_size);
}
}
else {
if (
!strcmp(chunk_id, "SAUR") // Wavosour data chunk
|| !strcmp(chunk_id, "otom") // Wavosaur?
|| !strcmp(chunk_id, "PAD ") // Padding
) {
// Known chunks to skip
}
else {
// Warn about unknown chunks so we can investigate them
LOG_DEBUG("Unhandled WAV chunk %s size %d (skipped)\n", chunk_id, chunk_size);
}
buffer_consume(buf, chunk_size);
}
}
offset += chunk_size;
}
}
int
wav_scan(ScanData s)
{
int ret = 1;
Buffer buf;
uint32_t chunk_size;
buffer_init(&buf, BLOCK_SIZE);
if ( !buffer_check_load(&buf, s->fp, 12, BLOCK_SIZE) ) {
ret = 0;
goto out;
}
if ( !strncmp( (char *)buffer_ptr(&buf), "RIFF", 4 ) ) {
// We've got a RIFF file
buffer_consume(&buf, 4);
chunk_size = buffer_get_int_le(&buf);
// Check format
if ( strncmp( (char *)buffer_ptr(&buf), "WAVE", 4 ) ) {
LOG_ERROR("Invalid WAV file: missing WAVE header: %s\n", s->path);
ret = 0;
goto out;
}
buffer_consume(&buf, 4);
_parse_wav(s, &buf);
}
else if ( !strncmp( (char *)buffer_ptr(&buf), "FORM", 4 ) ) {
// We've got an AIFF file
char *bptr;
buffer_consume(&buf, 4);
chunk_size = buffer_get_int(&buf);
// Check format
bptr = buffer_ptr(&buf);
if ( bptr[0] == 'A' && bptr[1] == 'I' && bptr[2] == 'F' && (bptr[3] == 'F' || bptr[3] == 'C') ) {
buffer_consume(&buf, 4);
//_parse_aiff(s, &buf);
}
else {
LOG_ERROR("Invalid AIFF file: missing AIFF header: %s\n", s->path);
ret = 0;
goto out;
}
}
else {
LOG_ERROR("Invalid WAV file: missing RIFF header: %s\n", s->path);
ret = 0;
goto out;
}
out:
buffer_free(&buf);
return ret;
}
