+ case Client::WAITING_FOR_KEYFRAME: {
+ Stream *stream = client->stream;
+ if (ssize_t(client->stream_pos) > stream->last_suitable_starting_point) {
+ // We haven't received a keyframe since this stream started waiting,
+ // so keep on waiting for one.
+ // This is postcondition #3.
+ stream->put_client_to_sleep(client);
+ return;
+ }
+ client->stream_pos = stream->last_suitable_starting_point;
+ client->state = Client::PREBUFFERING;
+ // Fall through.
+ }
+ case Client::PREBUFFERING: {
+ Stream *stream = client->stream;
+ size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+ assert(bytes_to_send <= stream->backlog_size);
+ if (bytes_to_send < stream->prebuffering_bytes) {
+ // We don't have enough bytes buffered to start this client yet.
+ stream->put_client_to_sleep(client);
+ return;
+ }
+ client->state = Client::SENDING_DATA;
+ // Fall through.
+ }