EXPORT_C
#endif
GstByteReader *
gst_byte_reader_new_from_buffer (const GstBuffer * buffer)
{
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
return gst_byte_reader_new (GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer));
}
static GstFlowReturn
gst_asf_parse_parse_data_object (GstAsfParse * asfparse, GstBuffer * buffer)
{
GstByteReader *reader;
GstFlowReturn ret = GST_FLOW_OK;
guint64 packet_count = 0;
GstMapInfo map;
GST_DEBUG_OBJECT (asfparse, "Parsing data object");
gst_buffer_map (buffer, &map, GST_MAP_READ);
reader = gst_byte_reader_new (map.data, map.size);
/* skip to packet count */
if (!gst_byte_reader_skip (reader, 40))
goto error;
if (!gst_byte_reader_get_uint64_le (reader, &packet_count))
goto error;
if (asfparse->asfinfo->packets_count != packet_count) {
GST_WARNING_OBJECT (asfparse, "File properties object and data object have "
"different packets count, %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT,
asfparse->asfinfo->packets_count, packet_count);
} else {
GST_DEBUG_OBJECT (asfparse, "Total packets: %" G_GUINT64_FORMAT,
packet_count);
}
gst_buffer_unmap (buffer, &map);
gst_byte_reader_free (reader);
return gst_asf_parse_push (asfparse, buffer);
error:
ret = GST_FLOW_ERROR;
GST_ERROR_OBJECT (asfparse, "Error while parsing data object headers");
gst_buffer_unmap (buffer, &map);
gst_byte_reader_free (reader);
return ret;
}
static gboolean webKitMediaClearKeyDecryptorDecrypt(WebKitMediaCommonEncryptionDecrypt* self, GstBuffer* ivBuffer, GstBuffer* buffer, unsigned subSampleCount, GstBuffer* subSamplesBuffer)
{
GstMapInfo ivMap;
if (!gst_buffer_map(ivBuffer, &ivMap, GST_MAP_READ)) {
GST_ERROR_OBJECT(self, "Failed to map IV");
return false;
}
uint8_t ctr[CLEARKEY_SIZE];
if (ivMap.size == 8) {
memset(ctr + 8, 0, 8);
memcpy(ctr, ivMap.data, 8);
} else {
ASSERT(ivMap.size == CLEARKEY_SIZE);
memcpy(ctr, ivMap.data, CLEARKEY_SIZE);
}
gst_buffer_unmap(ivBuffer, &ivMap);
WebKitMediaClearKeyDecryptPrivate* priv = WEBKIT_MEDIA_CK_DECRYPT_GET_PRIVATE(WEBKIT_MEDIA_CK_DECRYPT(self));
gcry_error_t error = gcry_cipher_setctr(priv->handle, ctr, CLEARKEY_SIZE);
if (error) {
GST_ERROR_OBJECT(self, "gcry_cipher_setctr failed: %s", gpg_strerror(error));
return false;
}
GstMapInfo map;
gboolean bufferMapped = gst_buffer_map(buffer, &map, static_cast<GstMapFlags>(GST_MAP_READWRITE));
if (!bufferMapped) {
GST_ERROR_OBJECT(self, "Failed to map buffer");
return false;
}
GstMapInfo subSamplesMap;
gboolean subsamplesBufferMapped = gst_buffer_map(subSamplesBuffer, &subSamplesMap, GST_MAP_READ);
if (!subsamplesBufferMapped) {
GST_ERROR_OBJECT(self, "Failed to map subsample buffer");
gst_buffer_unmap(buffer, &map);
return false;
}
GstByteReader* reader = gst_byte_reader_new(subSamplesMap.data, subSamplesMap.size);
unsigned position = 0;
unsigned sampleIndex = 0;
GST_DEBUG_OBJECT(self, "position: %d, size: %zu", position, map.size);
while (position < map.size) {
guint16 nBytesClear = 0;
guint32 nBytesEncrypted = 0;
if (sampleIndex < subSampleCount) {
if (!gst_byte_reader_get_uint16_be(reader, &nBytesClear)
|| !gst_byte_reader_get_uint32_be(reader, &nBytesEncrypted)) {
GST_DEBUG_OBJECT(self, "unsupported");
gst_byte_reader_free(reader);
gst_buffer_unmap(buffer, &map);
gst_buffer_unmap(subSamplesBuffer, &subSamplesMap);
return false;
}
sampleIndex++;
} else {
nBytesClear = 0;
nBytesEncrypted = map.size - position;
}
GST_TRACE_OBJECT(self, "%d bytes clear (todo=%zu)", nBytesClear, map.size - position);
position += nBytesClear;
if (nBytesEncrypted) {
GST_TRACE_OBJECT(self, "%d bytes encrypted (todo=%zu)", nBytesEncrypted, map.size - position);
error = gcry_cipher_decrypt(priv->handle, map.data + position, nBytesEncrypted, 0, 0);
if (error) {
GST_ERROR_OBJECT(self, "decryption failed: %s", gpg_strerror(error));
gst_byte_reader_free(reader);
gst_buffer_unmap(buffer, &map);
gst_buffer_unmap(subSamplesBuffer, &subSamplesMap);
return false;
}
position += nBytesEncrypted;
}
}
gst_byte_reader_free(reader);
gst_buffer_unmap(buffer, &map);
gst_buffer_unmap(subSamplesBuffer, &subSamplesMap);
return true;
}
static GstFlowReturn webkitMediaPlayReadyDecryptTransformInPlace(GstBaseTransform* base, GstBuffer* buffer)
{
WebKitMediaPlayReadyDecrypt* self = WEBKIT_MEDIA_PLAYREADY_DECRYPT(base);
GstFlowReturn result = GST_FLOW_OK;
GstMapInfo map;
const GValue* value;
guint sampleIndex = 0;
int errorCode;
uint32_t trackID = 0;
GstPad* pad;
GstCaps* caps;
GstMapInfo boxMap;
GstBuffer* box = nullptr;
GstProtectionMeta* protectionMeta = 0;
gboolean boxMapped = FALSE;
gboolean bufferMapped = FALSE;
GST_TRACE_OBJECT(self, "Processing buffer");
g_mutex_lock(&self->mutex);
GST_TRACE_OBJECT(self, "Mutex acquired, stream received: %s", self->streamReceived ? "yes":"no");
// The key might not have been received yet. Wait for it.
if (!self->streamReceived)
g_cond_wait(&self->condition, &self->mutex);
if (!self->streamReceived) {
GST_DEBUG_OBJECT(self, "Condition signaled from state change transition. Aborting.");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
GST_TRACE_OBJECT(self, "Proceeding with decryption");
protectionMeta = reinterpret_cast<GstProtectionMeta*>(gst_buffer_get_protection_meta(buffer));
if (!protectionMeta || !buffer) {
if (!protectionMeta)
GST_ERROR_OBJECT(self, "Failed to get GstProtection metadata from buffer %p", buffer);
if (!buffer)
GST_ERROR_OBJECT(self, "Failed to get writable buffer");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
bufferMapped = gst_buffer_map(buffer, &map, static_cast<GstMapFlags>(GST_MAP_READWRITE));
if (!bufferMapped) {
GST_ERROR_OBJECT(self, "Failed to map buffer");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
pad = gst_element_get_static_pad(GST_ELEMENT(self), "src");
caps = gst_pad_get_current_caps(pad);
if (g_str_has_prefix(gst_structure_get_name(gst_caps_get_structure(caps, 0)), "video/"))
trackID = 1;
else
trackID = 2;
gst_caps_unref(caps);
gst_object_unref(pad);
GST_TRACE_OBJECT(self, "Protection meta: %" GST_PTR_FORMAT, protectionMeta->info);
if (gst_structure_get_uint(protectionMeta->info, "sample-index", &sampleIndex)) {
// Process the PIFF box.
value = gst_structure_get_value(protectionMeta->info, "box");
if (!value) {
GST_ERROR_OBJECT(self, "Failed to get encryption box for sample");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
box = gst_value_get_buffer(value);
boxMapped = gst_buffer_map(box, &boxMap, GST_MAP_READ);
if (!boxMapped) {
GST_ERROR_OBJECT(self, "Failed to map encryption box");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
GST_TRACE_OBJECT(self, "decrypt sample %u", sampleIndex);
if ((errorCode = self->sessionMetaData->decrypt(static_cast<void*>(map.data), static_cast<uint32_t>(map.size),
static_cast<void*>(boxMap.data), static_cast<uint32_t>(boxMap.size), static_cast<uint32_t>(sampleIndex), trackID))) {
GST_WARNING_OBJECT(self, "ERROR - packet decryption failed [%d]", errorCode);
GST_MEMDUMP_OBJECT(self, "box", boxMap.data, boxMap.size);
result = GST_FLOW_ERROR;
goto beach;
}
} else {
// Process CENC data.
guint ivSize;
gboolean encrypted;
GstBuffer* ivBuffer = nullptr;
GstMapInfo ivMap;
unsigned position = 0;
unsigned sampleIndex = 0;
guint subSampleCount;
GstBuffer* subsamplesBuffer = nullptr;
GstMapInfo subSamplesMap;
GstByteReader* reader = nullptr;
if (!gst_structure_get_uint(protectionMeta->info, "iv_size", &ivSize)) {
GST_ERROR_OBJECT(self, "failed to get iv_size");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
if (!gst_structure_get_boolean(protectionMeta->info, "encrypted", &encrypted)) {
GST_ERROR_OBJECT(self, "failed to get encrypted flag");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
// Unencrypted sample.
if (!ivSize || !encrypted)
goto beach;
if (!gst_structure_get_uint(protectionMeta->info, "subsample_count", &subSampleCount)) {
GST_ERROR_OBJECT(self, "failed to get subsample_count");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
value = gst_structure_get_value(protectionMeta->info, "iv");
if (!value) {
GST_ERROR_OBJECT(self, "Failed to get IV for sample");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
ivBuffer = gst_value_get_buffer(value);
if (!gst_buffer_map(ivBuffer, &ivMap, GST_MAP_READ)) {
GST_ERROR_OBJECT(self, "Failed to map IV");
result = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
if (subSampleCount) {
value = gst_structure_get_value(protectionMeta->info, "subsamples");
if (!value) {
GST_ERROR_OBJECT(self, "Failed to get subsamples");
result = GST_FLOW_NOT_SUPPORTED;
goto release;
}
subsamplesBuffer = gst_value_get_buffer(value);
if (!gst_buffer_map(subsamplesBuffer, &subSamplesMap, GST_MAP_READ)) {
GST_ERROR_OBJECT(self, "Failed to map subsample buffer");
result = GST_FLOW_NOT_SUPPORTED;
goto release;
}
}
reader = gst_byte_reader_new(subSamplesMap.data, subSamplesMap.size);
if (!reader) {
GST_ERROR_OBJECT(self, "Failed to allocate subsample reader");
result = GST_FLOW_NOT_SUPPORTED;
goto release;
}
GST_DEBUG_OBJECT(self, "position: %d, size: %d", position, map.size);
while (position < map.size) {
guint16 nBytesClear = 0;
guint32 nBytesEncrypted = 0;
if (sampleIndex < subSampleCount) {
if (!gst_byte_reader_get_uint16_be(reader, &nBytesClear)
|| !gst_byte_reader_get_uint32_be(reader, &nBytesEncrypted)) {
result = GST_FLOW_NOT_SUPPORTED;
GST_DEBUG_OBJECT(self, "unsupported");
goto release;
}
sampleIndex++;
} else {
nBytesClear = 0;
nBytesEncrypted = map.size - position;
}
GST_TRACE_OBJECT(self, "%d bytes clear (todo=%d)", nBytesClear, map.size - position);
position += nBytesClear;
if (nBytesEncrypted) {
GST_TRACE_OBJECT(self, "%d bytes encrypted (todo=%d)", nBytesEncrypted, map.size - position);
if ((errorCode = self->sessionMetaData->processPayload(trackID, static_cast<const void*>(ivMap.data), static_cast<uint32_t>(ivMap.size), static_cast<void*>(map.data + position), static_cast<uint32_t>(nBytesEncrypted)))) {
GST_WARNING_OBJECT(self, "ERROR - packet decryption failed [%d]", errorCode);
result = GST_FLOW_ERROR;
goto release;
}
position += nBytesEncrypted;
}
}
release:
gst_buffer_unmap(ivBuffer, &ivMap);
if (reader)
gst_byte_reader_free(reader);
if (subsamplesBuffer)
gst_buffer_unmap(subsamplesBuffer, &subSamplesMap);
}
beach:
if (boxMapped)
gst_buffer_unmap(box, &boxMap);
if (bufferMapped)
gst_buffer_unmap(buffer, &map);
if (protectionMeta)
gst_buffer_remove_meta(buffer, reinterpret_cast<GstMeta*>(protectionMeta));
GST_TRACE_OBJECT(self, "Unlocking mutex");
g_mutex_unlock(&self->mutex);
return result;
}
static GstFlowReturn
gst_cenc_decrypt_transform_ip (GstBaseTransform * base, GstBuffer * buf)
{
GstCencDecrypt *self = GST_CENC_DECRYPT (base);
GstFlowReturn ret = GST_FLOW_OK;
GstMapInfo map, iv_map;
const GstCencKeyPair *keypair;
const GstProtectionMeta *prot_meta = NULL;
guint pos = 0;
gint sample_index = 0;
guint subsample_count;
AesCtrState *state = NULL;
guint iv_size;
gboolean encrypted;
const GValue *value;
GstBuffer *key_id = NULL;
GstBuffer *iv_buf = NULL;
GBytes *iv_bytes = NULL;
GstBuffer *subsamples_buf = NULL;
GstMapInfo subsamples_map;
GstByteReader *reader=NULL;
GST_TRACE_OBJECT (self, "decrypt in-place");
prot_meta = (GstProtectionMeta*) gst_buffer_get_protection_meta (buf);
if (!prot_meta || !buf) {
if (!prot_meta) {
GST_ERROR_OBJECT (self, "Failed to get GstProtection metadata from buffer");
}
if (!buf) {
GST_ERROR_OBJECT (self, "Failed to get writable buffer");
}
ret = GST_FLOW_NOT_SUPPORTED;
goto out;
}
if (!gst_buffer_map (buf, &map, GST_MAP_READWRITE)) {
GST_ERROR_OBJECT (self, "Failed to map buffer");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
GST_TRACE_OBJECT (self, "decrypt sample %d", (gint)map.size);
if(!gst_structure_get_uint(prot_meta->info,"iv_size",&iv_size)){
GST_ERROR_OBJECT (self, "failed to get iv_size");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
if(!gst_structure_get_boolean(prot_meta->info,"encrypted",&encrypted)){
GST_ERROR_OBJECT (self, "failed to get encrypted flag");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
if (iv_size == 0 || !encrypted) {
/* sample is not encrypted */
goto beach;
}
GST_DEBUG_OBJECT (base, "protection meta: %" GST_PTR_FORMAT, prot_meta->info);
if(!gst_structure_get_uint(prot_meta->info,"subsample_count",&subsample_count)){
GST_ERROR_OBJECT (self, "failed to get subsample_count");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
value = gst_structure_get_value (prot_meta->info, "kid");
if(!value){
GST_ERROR_OBJECT (self, "Failed to get KID for sample");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
key_id = gst_value_get_buffer (value);
value = gst_structure_get_value (prot_meta->info, "iv");
if(!value){
GST_ERROR_OBJECT (self, "Failed to get IV for sample");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
iv_buf = gst_value_get_buffer (value);
if(!gst_buffer_map (iv_buf, &iv_map, GST_MAP_READ)){
GST_ERROR_OBJECT (self, "Failed to map IV");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
iv_bytes = g_bytes_new (iv_map.data, iv_map.size);
gst_buffer_unmap (iv_buf, &iv_map);
if(subsample_count){
value = gst_structure_get_value (prot_meta->info, "subsamples");
if(!value){
GST_ERROR_OBJECT (self, "Failed to get subsamples");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
subsamples_buf = gst_value_get_buffer (value);
if(!gst_buffer_map (subsamples_buf, &subsamples_map, GST_MAP_READ)){
GST_ERROR_OBJECT (self, "Failed to map subsample buffer");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
}
keypair = gst_cenc_decrypt_lookup_key (self,key_id);
if (!keypair) {
gsize sz;
GST_ERROR_OBJECT (self, "Failed to lookup key");
GST_MEMDUMP_OBJECT (self, "Key ID:",
g_bytes_get_data (keypair->key_id, &sz),
sz);
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
state = gst_aes_ctr_decrypt_new (keypair->key, iv_bytes);
if (!state) {
GST_ERROR_OBJECT (self, "Failed to init AES cipher");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
if (subsample_count) {
reader = gst_byte_reader_new (subsamples_map.data, subsamples_map.size);
if(!reader){
GST_ERROR_OBJECT (self, "Failed to allocate subsample reader");
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
}
while (pos < map.size) {
guint16 n_bytes_clear = 0;
guint32 n_bytes_encrypted = 0;
if (sample_index < subsample_count) {
if (!gst_byte_reader_get_uint16_be (reader, &n_bytes_clear)
|| !gst_byte_reader_get_uint32_be (reader, &n_bytes_encrypted)) {
ret = GST_FLOW_NOT_SUPPORTED;
goto release;
}
sample_index++;
} else {
n_bytes_clear = 0;
n_bytes_encrypted = map.size - pos;
}
GST_TRACE_OBJECT (self, "%u bytes clear (todo=%d)", n_bytes_clear,
(gint)map.size - pos);
pos += n_bytes_clear;
if (n_bytes_encrypted) {
GST_TRACE_OBJECT (self, "%u bytes encrypted (todo=%d)",
n_bytes_encrypted, (gint)map.size - pos);
gst_aes_ctr_decrypt_ip (state, map.data + pos, n_bytes_encrypted);
pos += n_bytes_encrypted;
}
}
beach:
gst_buffer_unmap (buf, &map);
if (state) {
gst_aes_ctr_decrypt_unref (state);
}
release:
if (reader){
gst_byte_reader_free (reader);
}
if(subsamples_buf){
gst_buffer_unmap (subsamples_buf, &subsamples_map);
}
if (prot_meta) {
gst_buffer_remove_meta (buf, (GstMeta *) prot_meta);
}
if (iv_bytes) {
g_bytes_unref (iv_bytes);
}
out:
return ret;
}