static int
image_gif_read_buf(GifFileType *gif, GifByteType *data, int len)
{
image *im = (image *)gif->UserData;
//DEBUG_TRACE("GIF read_buf wants %d bytes, %d in buffer\n", len, buffer_len(im->buf));
if (im->fh != NULL) {
if ( !_check_buf(im->fh, im->buf, len, MAX(len, BUFFER_SIZE)) ) {
warn("Image::Scale not enough GIF data (%s)\n", SvPVX(im->path));
return 0;
}
}
else {
if (len > buffer_len(im->buf)) {
// read from SV into buffer
int sv_readlen = len - buffer_len(im->buf);
if (sv_readlen > sv_len(im->sv_data) - im->sv_offset) {
warn("Image::Scale not enough GIF data (%s)\n", SvPVX(im->path));
return 0;
}
DEBUG_TRACE(" Reading %d bytes of SV data @ %d\n", sv_readlen, im->sv_offset);
buffer_append(im->buf, SvPVX(im->sv_data) + im->sv_offset, sv_readlen);
im->sv_offset += sv_readlen;
}
}
memcpy(data, buffer_ptr(im->buf), len);
buffer_consume(im->buf, len);
return len;
}
int
_wavpack_parse_old(wvpinfo *wvp)
{
int ret = 1;
char chunk_id[5];
uint32_t chunk_size;
WavpackHeader3 wphdr;
WaveHeader3 wavhdr;
unsigned char *bptr;
uint32_t total_samples;
uint32_t song_length_ms;
Zero(&wavhdr, sizeof(wavhdr), char);
Zero(&wphdr, sizeof(wphdr), char);
DEBUG_TRACE("Parsing old WavPack version\n");
// Verify RIFF header
if ( strncmp( (char *)buffer_ptr(wvp->buf), "RIFF", 4 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid WavPack file: missing RIFF header: %s\n", wvp->file);
ret = 0;
goto out;
}
buffer_consume(wvp->buf, 4);
chunk_size = buffer_get_int_le(wvp->buf);
// Check format
if ( strncmp( (char *)buffer_ptr(wvp->buf), "WAVE", 4 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid WavPack file: missing WAVE header: %s\n", wvp->file);
ret = 0;
goto out;
}
buffer_consume(wvp->buf, 4);
wvp->file_offset += 12;
// Verify we have at least 8 bytes
if ( !_check_buf(wvp->infile, wvp->buf, 8, WAVPACK_BLOCK_SIZE) ) {
ret = 0;
goto out;
}
// loop through all chunks, read fmt, and break at data
while ( buffer_len(wvp->buf) >= 8 ) {
strncpy( chunk_id, (char *)buffer_ptr(wvp->buf), 4 );
chunk_id[4] = '\0';
buffer_consume(wvp->buf, 4);
chunk_size = buffer_get_int_le(wvp->buf);
wvp->file_offset += 8;
// Adjust for padding
if ( chunk_size % 2 ) {
chunk_size++;
}
DEBUG_TRACE(" %s size %d\n", chunk_id, chunk_size);
if ( !strcmp( chunk_id, "data" ) ) {
break;
}
wvp->file_offset += chunk_size;
if ( !strcmp( chunk_id, "fmt " ) ) {
if ( !_check_buf(wvp->infile, wvp->buf, chunk_size, WAV_BLOCK_SIZE) ) {
ret = 0;
goto out;
}
if (chunk_size < sizeof(wavhdr)) {
ret = 0;
goto out;
}
// Read wav header
wavhdr.FormatTag = buffer_get_short_le(wvp->buf);
wavhdr.NumChannels = buffer_get_short_le(wvp->buf);
wavhdr.SampleRate = buffer_get_int_le(wvp->buf);
wavhdr.BytesPerSecond = buffer_get_int_le(wvp->buf);
wavhdr.BlockAlign = buffer_get_short_le(wvp->buf);
wavhdr.BitsPerSample = buffer_get_short_le(wvp->buf);
// Skip rest of fmt chunk if necessary
if (chunk_size > 16) {
_wavpack_skip(wvp, chunk_size - 16);
}
}
else {
// Skip it
_wavpack_skip(wvp, chunk_size);
}
// Verify we have at least 8 bytes
if ( !_check_buf(wvp->infile, wvp->buf, 8, WAVPACK_BLOCK_SIZE) ) {
ret = 0;
goto out;
}
}
// Verify wav header, this code comes from unpack3.c
if (
wavhdr.FormatTag != 1 || !wavhdr.NumChannels || wavhdr.NumChannels > 2 ||
!wavhdr.SampleRate || wavhdr.BitsPerSample < 16 || wavhdr.BitsPerSample > 24 ||
wavhdr.BlockAlign / wavhdr.NumChannels > 3 || wavhdr.BlockAlign % wavhdr.NumChannels ||
wavhdr.BlockAlign / wavhdr.NumChannels < (wavhdr.BitsPerSample + 7) / 8
) {
ret = 0;
goto out;
}
// chunk_size here is the size of the data chunk
total_samples = chunk_size / wavhdr.NumChannels / ((wavhdr.BitsPerSample > 16) ? 3 : 2);
// read WavpackHeader3 (differs for each version)
bptr = buffer_ptr(wvp->buf);
if ( bptr[0] != 'w' || bptr[1] != 'v' || bptr[2] != 'p' || bptr[3] != 'k' ) {
PerlIO_printf(PerlIO_stderr(), "Invalid WavPack file: missing wvpk header: %s\n", wvp->file);
ret = 0;
goto out;
}
buffer_consume(wvp->buf, 4);
wphdr.ckSize = buffer_get_int_le(wvp->buf);
wphdr.version = buffer_get_short_le(wvp->buf);
if (wphdr.version >= 2) {
wphdr.bits = buffer_get_short_le(wvp->buf);
}
if (wphdr.version == 3) {
wphdr.flags = buffer_get_short_le(wvp->buf);
wphdr.shift = buffer_get_short_le(wvp->buf);
wphdr.total_samples = buffer_get_int_le(wvp->buf);
total_samples = wphdr.total_samples;
}
DEBUG_TRACE("wvpk header @ %llu:\n", wvp->file_offset);
DEBUG_TRACE(" size: %u\n", wphdr.ckSize);
DEBUG_TRACE(" version: %d\n", wphdr.version);
DEBUG_TRACE(" bits: 0x%x\n", wphdr.bits);
DEBUG_TRACE(" flags: 0x%x\n", wphdr.flags);
DEBUG_TRACE(" shift: 0x%x\n", wphdr.shift);
DEBUG_TRACE(" total_samples: %d\n", wphdr.total_samples);
my_hv_store( wvp->info, "encoder_version", newSVuv(wphdr.version) );
my_hv_store( wvp->info, "bits_per_sample", newSVuv(wavhdr.BitsPerSample) );
my_hv_store( wvp->info, "channels", newSVuv(wavhdr.NumChannels) );
my_hv_store( wvp->info, "samplerate", newSVuv(wavhdr.SampleRate) );
my_hv_store( wvp->info, "total_samples", newSVuv(total_samples) );
song_length_ms = ((total_samples * 1.0) / wavhdr.SampleRate) * 1000;
my_hv_store( wvp->info, "song_length_ms", newSVuv(song_length_ms) );
my_hv_store( wvp->info, "bitrate", newSVuv( _bitrate(wvp->file_size - wvp->audio_offset, song_length_ms) ) );
out:
return ret;
}
int
image_init(HV *self, image *im)
{
unsigned char *bptr;
char *file = NULL;
int ret = 1;
if (my_hv_exists(self, "file")) {
// Input from file
SV *path = *(my_hv_fetch(self, "file"));
file = SvPVX(path);
im->fh = IoIFP(sv_2io(*(my_hv_fetch(self, "_fh"))));
im->path = newSVsv(path);
}
else {
// Input from scalar ref
im->fh = NULL;
im->path = newSVpv("(data)", 0);
im->sv_data = *(my_hv_fetch(self, "data"));
if (SvROK(im->sv_data))
im->sv_data = SvRV(im->sv_data);
else
croak("data is not a scalar ref\n");
}
im->pixbuf = NULL;
im->outbuf = NULL;
im->outbuf_size = 0;
im->type = UNKNOWN;
im->sv_offset = 0;
im->image_offset = 0;
im->image_length = 0;
im->width = 0;
im->height = 0;
im->width_padding = 0;
im->width_inner = 0;
im->height_padding = 0;
im->height_inner = 0;
im->flipped = 0;
im->bpp = 0;
im->channels = 0;
im->has_alpha = 0;
im->orientation = ORIENTATION_NORMAL;
im->orientation_orig = ORIENTATION_NORMAL;
im->memory_limit = 0;
im->target_width = 0;
im->target_height = 0;
im->keep_aspect = 0;
im->resize_type = IMAGE_SCALE_TYPE_GD_FIXED;
im->filter = 0;
im->bgcolor = 0;
im->used = 0;
im->palette = NULL;
#ifdef HAVE_JPEG
im->cinfo = NULL;
#endif
#ifdef HAVE_PNG
im->png_ptr = NULL;
im->info_ptr = NULL;
#endif
#ifdef HAVE_GIF
im->gif = NULL;
#endif
// Read new() options
if (my_hv_exists(self, "offset")) {
im->image_offset = SvIV(*(my_hv_fetch(self, "offset")));
if (im->fh != NULL)
PerlIO_seek(im->fh, im->image_offset, SEEK_SET);
}
if (my_hv_exists(self, "length"))
im->image_length = SvIV(*(my_hv_fetch(self, "length")));
Newz(0, im->buf, sizeof(Buffer), Buffer);
buffer_init(im->buf, BUFFER_SIZE);
im->memory_used = BUFFER_SIZE;
// Determine type of file from magic bytes
if (im->fh != NULL) {
if ( !_check_buf(im->fh, im->buf, 8, BUFFER_SIZE) ) {
image_finish(im);
croak("Unable to read image header for %s\n", file);
}
}
else {
im->sv_offset = MIN(sv_len(im->sv_data) - im->image_offset, BUFFER_SIZE);
buffer_append(im->buf, SvPVX(im->sv_data) + im->image_offset, im->sv_offset);
}
bptr = buffer_ptr(im->buf);
switch (bptr[0]) {
case 0xff:
if (bptr[1] == 0xd8 && bptr[2] == 0xff) {
#ifdef HAVE_JPEG
im->type = JPEG;
#else
image_finish(im);
croak("Image::Scale was not built with JPEG support\n");
#endif
}
break;
case 0x89:
if (bptr[1] == 'P' && bptr[2] == 'N' && bptr[3] == 'G'
&& bptr[4] == 0x0d && bptr[5] == 0x0a && bptr[6] == 0x1a && bptr[7] == 0x0a) {
#ifdef HAVE_PNG
im->type = PNG;
#else
image_finish(im);
croak("Image::Scale was not built with PNG support\n");
#endif
}
break;
case 'G':
if (bptr[1] == 'I' && bptr[2] == 'F' && bptr[3] == '8'
&& (bptr[4] == '7' || bptr[4] == '9') && bptr[5] == 'a') {
#ifdef HAVE_GIF
im->type = GIF;
#else
image_finish(im);
croak("Image::Scale was not built with GIF support\n");
#endif
}
break;
case 'B':
if (bptr[1] == 'M') {
im->type = BMP;
}
break;
}
DEBUG_TRACE("Image type: %d\n", im->type);
// Read image header via type-specific function to determine dimensions
switch (im->type) {
#ifdef HAVE_JPEG
case JPEG:
if ( !image_jpeg_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
#ifdef HAVE_PNG
case PNG:
if ( !image_png_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
#ifdef HAVE_GIF
case GIF:
if ( !image_gif_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
case BMP:
image_bmp_read_header(im);
break;
case UNKNOWN:
warn("Image::Scale unknown file type (%s), first 8 bytes were: %02x %02x %02x %02x %02x %02x %02x %02x\n",
SvPVX(im->path), bptr[0], bptr[1], bptr[2], bptr[3], bptr[4], bptr[5], bptr[6], bptr[7]);
ret = 0;
break;
}
DEBUG_TRACE("Image dimenensions: %d x %d, channels %d\n", im->width, im->height, im->channels);
out:
if (ret == 0)
image_finish(im);
return ret;
}
wvpinfo *
_wavpack_parse(PerlIO *infile, char *file, HV *info, uint8_t seeking)
{
int err = 0;
int done = 0;
u_char *bptr;
wvpinfo *wvp;
Newz(0, wvp, sizeof(wvpinfo), wvpinfo);
Newz(0, wvp->buf, sizeof(Buffer), Buffer);
Newz(0, wvp->header, sizeof(WavpackHeader), WavpackHeader);
wvp->infile = infile;
wvp->file = file;
wvp->info = info;
wvp->file_offset = 0;
wvp->audio_offset = 0;
wvp->seeking = seeking ? 1 : 0;
buffer_init(wvp->buf, WAVPACK_BLOCK_SIZE);
wvp->file_size = _file_size(infile);
my_hv_store( info, "file_size", newSVuv(wvp->file_size) );
// Loop through each wvpk block until we find a good one
while (!done) {
if ( !_check_buf(infile, wvp->buf, 32, WAVPACK_BLOCK_SIZE) ) {
err = -1;
goto out;
}
bptr = buffer_ptr(wvp->buf);
// If first byte is 'R', assume old version
if ( bptr[0] == 'R' ) {
if ( !_wavpack_parse_old(wvp) ) {
err = -1;
goto out;
}
break;
}
// May need to read past some junk before wvpk header
while ( bptr[0] != 'w' || bptr[1] != 'v' || bptr[2] != 'p' || bptr[3] != 'k' ) {
buffer_consume(wvp->buf, 1);
wvp->audio_offset++;
if ( !buffer_len(wvp->buf) ) {
if ( !_check_buf(infile, wvp->buf, 32, WAVPACK_BLOCK_SIZE) ) {
PerlIO_printf(PerlIO_stderr(), "Unable to find a valid WavPack block in file: %s\n", file);
err = -1;
goto out;
}
}
bptr = buffer_ptr(wvp->buf);
}
if ( _wavpack_parse_block(wvp) ) {
done = 1;
}
}
my_hv_store( info, "audio_offset", newSVuv(wvp->audio_offset) );
my_hv_store( info, "audio_size", newSVuv(wvp->file_size - wvp->audio_offset) );
out:
buffer_free(wvp->buf);
Safefree(wvp->buf);
Safefree(wvp->header);
return wvp;
}
int
_wavpack_parse_block(wvpinfo *wvp)
{
unsigned char *bptr;
uint16_t remaining;
bptr = buffer_ptr(wvp->buf);
// Verify wvpk signature
if ( bptr[0] != 'w' || bptr[1] != 'v' || bptr[2] != 'p' || bptr[3] != 'k' ) {
DEBUG_TRACE("Invalid wvpk header at %llu\n", wvp->file_offset);
return 1;
}
buffer_consume(wvp->buf, 4);
wvp->header->ckSize = buffer_get_int_le(wvp->buf);
wvp->header->version = buffer_get_short_le(wvp->buf);
wvp->header->track_no = buffer_get_char(wvp->buf);
wvp->header->index_no = buffer_get_char(wvp->buf);
wvp->header->total_samples = buffer_get_int_le(wvp->buf);
wvp->header->block_index = buffer_get_int_le(wvp->buf);
wvp->header->block_samples = buffer_get_int_le(wvp->buf);
wvp->header->flags = buffer_get_int_le(wvp->buf);
wvp->header->crc = buffer_get_int_le(wvp->buf);
DEBUG_TRACE("wvpk header @ %llu:\n", wvp->file_offset);
DEBUG_TRACE(" size: %u\n", wvp->header->ckSize);
DEBUG_TRACE(" version: 0x%x\n", wvp->header->version);
DEBUG_TRACE(" track_no: 0x%x\n", wvp->header->track_no);
DEBUG_TRACE(" index_no: 0x%x\n", wvp->header->index_no);
DEBUG_TRACE(" total_samples: %u\n", wvp->header->total_samples);
DEBUG_TRACE(" block_index: %u\n", wvp->header->block_index);
DEBUG_TRACE(" block_samples: %u\n", wvp->header->block_samples);
DEBUG_TRACE(" flags: 0x%x\n", wvp->header->flags);
DEBUG_TRACE(" crc: 0x%x\n", wvp->header->crc);
wvp->file_offset += 32;
my_hv_store( wvp->info, "encoder_version", newSVuv(wvp->header->version) );
if (wvp->header->version < 0x4) {
// XXX old version and not handled by 'R' check above for old version
PerlIO_printf(PerlIO_stderr(), "Unsupported old WavPack version: 0x%x\n", wvp->header->version);
return 1;
}
// Read data from flags
my_hv_store( wvp->info, "bits_per_sample", newSVuv( 8 * ((wvp->header->flags & 0x3) + 1) ) );
// Encoding mode
my_hv_store( wvp->info, (wvp->header->flags & 0x8) ? "hybrid" : "lossless", newSVuv(1) );
{
// samplerate, may be overridden by a later ID_SAMPLE_RATE metadata block
uint32_t samplerate_index = (wvp->header->flags & 0x7800000) >> 23;
if ( samplerate_index >= 0 && samplerate_index < 0xF ) {
my_hv_store( wvp->info, "samplerate", newSVuv( wavpack_sample_rates[samplerate_index] ) );
}
else {
// Default to 44.1 just in case
my_hv_store( wvp->info, "samplerate", newSVuv(44100) );
}
}
// Channels, may be overridden by a later ID_CHANNEL_INFO metadata block
my_hv_store( wvp->info, "channels", newSVuv( (wvp->header->flags & 0x4) ? 1 : 2 ) );
// Parse metadata sub-blocks
remaining = wvp->header->ckSize - 24; // ckSize is 8 less than the block size
// If block_samples is 0, we need to skip to the next block
if ( !wvp->header->block_samples ) {
wvp->file_offset += remaining;
_wavpack_skip(wvp, remaining);
return 0;
}
while (remaining > 0) {
// Read sub-block header (2-4 bytes)
unsigned char id;
uint32_t size;
DEBUG_TRACE("remaining: %d\n", remaining);
if ( !_check_buf(wvp->infile, wvp->buf, 4, WAVPACK_BLOCK_SIZE) ) {
return 0;
}
id = buffer_get_char(wvp->buf);
remaining--;
// Size is in words
if (id & ID_LARGE) {
// 24-bit large size
id &= ~ID_LARGE;
size = buffer_get_int24_le(wvp->buf) << 1;
remaining -= 3;
DEBUG_TRACE(" ID_LARGE, changed to %x\n", id);
}
else {
// 8-bit size
size = buffer_get_char(wvp->buf) << 1;
remaining--;
}
if (id & ID_ODD_SIZE) {
id &= ~ID_ODD_SIZE;
size--;
DEBUG_TRACE(" ID_ODD_SIZE, changed to %x\n", id);
}
if ( id == ID_WV_BITSTREAM || !size ) {
// Found the bitstream, don't read any farther
DEBUG_TRACE(" Sub-Chunk: WV_BITSTREAM (size %u)\n", size);
break;
}
// We only care about 0x27 (ID_SAMPLE_RATE) and 0xd (ID_CHANNEL_INFO)
switch (id) {
case ID_SAMPLE_RATE:
DEBUG_TRACE(" Sub-Chunk: ID_SAMPLE_RATE (size: %u)\n", size);
_wavpack_parse_sample_rate(wvp, size);
break;
case ID_CHANNEL_INFO:
DEBUG_TRACE(" Sub-Chunk: ID_CHANNEL_INFO (size: %u)\n", size);
_wavpack_parse_channel_info(wvp, size);
break;
default:
// Skip it
DEBUG_TRACE(" Sub-Chunk: %x (size: %u) (skipped)\n", id, size);
_wavpack_skip(wvp, size);
}
remaining -= size;
// If size was odd, skip a byte
if (size & 0x1) {
if ( buffer_len(wvp->buf) ) {
buffer_consume(wvp->buf, 1);
}
else {
_wavpack_skip(wvp, 1);
}
remaining--;
}
}
// Calculate bitrate
if ( wvp->header->total_samples && wvp->file_size > 0 ) {
SV **samplerate = my_hv_fetch( wvp->info, "samplerate" );
if (samplerate != NULL) {
uint32_t song_length_ms = ((wvp->header->total_samples * 1.0) / SvIV(*samplerate)) * 1000;
my_hv_store( wvp->info, "song_length_ms", newSVuv(song_length_ms) );
my_hv_store( wvp->info, "bitrate", newSVuv( _bitrate(wvp->file_size - wvp->audio_offset, song_length_ms) ) );
my_hv_store( wvp->info, "total_samples", newSVuv(wvp->header->total_samples) );
}
}
return 1;
}
void
_parse_wav(PerlIO *infile, Buffer *buf, char *file, uint32_t file_size, HV *info, HV *tags)
{
uint32_t offset = 12;
while ( offset < file_size - 8 ) {
char chunk_id[5];
uint32_t chunk_size;
// Verify we have at least 8 bytes
if ( !_check_buf(infile, buf, 8, WAV_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;
DEBUG_TRACE("%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" ) ) {
SV **bitrate;
my_hv_store( info, "audio_offset", newSVuv(offset) );
my_hv_store( info, "audio_size", newSVuv(chunk_size) );
// Calculate duration, unless we already know it (i.e. from 'fact')
if ( !my_hv_fetch( info, "song_length_ms" ) ) {
bitrate = my_hv_fetch( info, "bitrate" );
if (bitrate != NULL) {
my_hv_store( info, "song_length_ms", newSVuv( (chunk_size / (SvIV(*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 > file_size - offset) {
DEBUG_TRACE("data size > file_size, skipping\n");
return;
}
// Seek past data if there are more chunks after it
if ( file_size > offset + chunk_size ) {
PerlIO_seek(infile, 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
PerlIO_seek(infile, offset + chunk_size, SEEK_SET);
buffer_clear(buf);
}
else {
// sanity check size
if (chunk_size > file_size - offset) {
DEBUG_TRACE("chunk_size > file_size, skipping\n");
return;
}
// Make sure we have enough data
if ( !_check_buf(infile, buf, chunk_size, WAV_BLOCK_SIZE) ) {
return;
}
if ( !strcmp( chunk_id, "fmt " ) ) {
_parse_wav_fmt(buf, chunk_size, info);
}
else if ( !strcmp( chunk_id, "LIST" ) ) {
_parse_wav_list(buf, chunk_size, tags);
}
else if ( !strcmp( chunk_id, "PEAK" ) ) {
_parse_wav_peak(buf, chunk_size, info, 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);
SV **samplerate = my_hv_fetch( info, "samplerate" );
if (samplerate != NULL) {
my_hv_store( info, "song_length_ms", newSVuv( (num_samples * 1000) / SvIV(*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
PerlIO_printf(PerlIO_stderr(), "Unhandled WAV chunk %s size %d (skipped)\n", chunk_id, chunk_size);
}
buffer_consume(buf, chunk_size);
}
}
offset += chunk_size;
}
}
void
_parse_aiff(PerlIO *infile, Buffer *buf, char *file, uint32_t file_size, HV *info, HV *tags)
{
uint32_t offset = 12;
while ( offset < file_size - 8 ) {
char chunk_id[5];
int chunk_size;
// Verify we have at least 8 bytes
if ( !_check_buf(infile, buf, 8, WAV_BLOCK_SIZE) ) {
return;
}
strncpy( chunk_id, (char *)buffer_ptr(buf), 4 );
chunk_id[4] = '\0';
buffer_consume(buf, 4);
chunk_size = buffer_get_int(buf);
// Adjust for padding
if ( chunk_size % 2 ) {
chunk_size++;
}
offset += 8;
DEBUG_TRACE("%s size %d\n", chunk_id, chunk_size);
// Seek past SSND, everything else we parse
// XXX: Are there other large chunks we should ignore?
if ( !strcmp( chunk_id, "SSND" ) ) {
my_hv_store( info, "audio_offset", newSVuv(offset) );
my_hv_store( info, "audio_size", newSVuv(chunk_size) );
// Seek past data if there are more chunks after it
if ( file_size > offset + chunk_size ) {
PerlIO_seek(infile, 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);
}
// Seen ID3 chunks with the chunk size in little-endian instead of big-endian
if (chunk_size < 0 || offset + chunk_size > file_size) {
break;
}
// Seek past ID3 and clear buffer
DEBUG_TRACE("Seeking past ID3 to %d\n", offset + chunk_size);
PerlIO_seek(infile, offset + chunk_size, SEEK_SET);
buffer_clear(buf);
}
else {
// Make sure we have enough data
if ( !_check_buf(infile, buf, chunk_size, WAV_BLOCK_SIZE) ) {
return;
}
if ( !strcmp( chunk_id, "COMM" ) ) {
_parse_aiff_comm(buf, chunk_size, info);
}
else if ( !strcmp( chunk_id, "PEAK" ) ) {
_parse_wav_peak(buf, chunk_size, info, 1);
}
else {
PerlIO_printf(PerlIO_stderr(), "Unhandled AIFF chunk %s size %d (skipped)\n", chunk_id, chunk_size);
buffer_consume(buf, chunk_size);
}
}
offset += chunk_size;
}
}
static int
get_wav_metadata(PerlIO *infile, char *file, HV *info, HV *tags)
{
Buffer buf;
off_t file_size;
int err = 0;
uint32_t chunk_size;
file_size = _file_size(infile);
buffer_init(&buf, WAV_BLOCK_SIZE);
if ( !_check_buf(infile, &buf, 12, WAV_BLOCK_SIZE) ) {
err = -1;
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 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid WAV file: missing WAVE header: %s\n", file);
err = -1;
goto out;
}
buffer_consume(&buf, 4);
my_hv_store( info, "file_size", newSVuv(file_size) );
_parse_wav(infile, &buf, file, file_size, info, tags);
}
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);
my_hv_store( info, "file_size", newSVuv(file_size) );
_parse_aiff(infile, &buf, file, file_size, info, tags);
}
else {
PerlIO_printf(PerlIO_stderr(), "Invalid AIFF file: missing AIFF header: %s\n", file);
err = -1;
goto out;
}
}
else {
PerlIO_printf(PerlIO_stderr(), "Invalid WAV file: missing RIFF header: %s\n", file);
err = -1;
goto out;
}
out:
buffer_free(&buf);
if (err) return err;
return 0;
}
